[Due to the increasing size of the archives, each topic page now contains only the prior 365 days of content. Access to older stories is now solely through the Monthly Archive pages or the site search function.]
NSF to award $13M for fundamental engineering research on production of electricity and fuels
July 27, 2015
The US National Science Foundation (NSF) Division of Chemical, Bioengineering, Environmental, and Transport Systems (CBET) has issued a funding opportunity announcement (PD 15-7644) for the award of an estimated $13,093,000 to support fundamental engineering research that will enable innovative processes for the sustainable production (and storage) of electricity and fuels.
Processes for sustainable energy production must be environmentally benign, reduce greenhouse gas production, and utilize renewable resources. Current topics of interest include:
DLR and Wuppertal publish comprehensive global analysis of e-mobility technologies, outlook and lifecycle assessments
July 23, 2015
The German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) and the Wuppertal Institute for Climate, Environment and Energy (Wuppertal Institut für Klima, Umwelt, Energie GmbH; WI) have published results of their STROMbegleitung (electricity evaluation) comprehensive study to analyze technologies; market outlook; policy support; infrastructure; and life-cycle assessments for electrically-powered transport.
The study, which ran from October 2011 – September 2014, comprehensively charts current progress in technology; identifies trends; analyzes lifecycle assessments for a variety of vehicle concepts; and assess material intensities. At the same time, it places German activities in the field of electromobility within an international context. The research program received a €1.7 million euro grant from the German Federal Ministry of Education and Research (Bundesministerium für Bildung und Forschung; BMBF) as part of the STROM support program (key technologies for electromobility).
Researchers fabricate high-performance 3D silicon anodes for Li-ion batteries from reed leaves
Nanoporous silicon is considered an attractive next-generation anode material in lithium-ion batteries due to its much higher theoretical capacity and lower operating voltage than the commonly used graphitic carbon materials. However, one challenge ia finding a suitable low-cost strategy to employ an appropriate nano-structured silicon material that would compensate for the large volume expansion upon lithium insertion.
Researchers at Max Planck Institute for Solid State Research, the University of Science and Technology of China, and the South China University of Technology have taken a novel approach—one quite distinct from elaborate physical or chemical treatments of expensive silicon precursors. The team led by Prof. Yan Yu fabricated 3D porous silicon-based anode materials from natural reed leaves using calcination and magnesiothermic reduction.
MTU Friedrichshafen forms partnership with AKASOL for battery systems for hybrid and e-drive propulsion systems
July 22, 2015
MTU Friedrichshafen GmbH, one of the world’s leading manufacturers of large diesel engines and complete propulsion systems, has formed a close development partnership with AKASOL GmbH, a Darmstadt-based subsidiary of Schulz Group (Tettnang) and a leading manufacturer of Li-ion battery systems for high performance applications. The partnership aims to develop and to deliver battery systems for MTU’s hybrid and e-drive propulsion systems.
With the help of AKASOL battery systems, MTU aims to extend its current product range with hybrid propulsion systems for mobile applications in the marine, heavy duty ground vehicles and rail sector. In the near future, AKASOL systems will be used in stationary industrial drives as well.
New approach to self-extinguishing Li-ion batteries: temperature-responsive fire-extinguishing microcapsules
July 21, 2015
Researchers at the Advanced Batteries Research Center of the Korea Electronics Technology Institute have developed lithium-ion batteries with a self-extinguishing capability for improved safety by integrating temperature-responsive microcapsules containing a fire-extinguishing agent in the cell.
The microcapsules release the extinguisher agent upon increased internal temperature of a battery cell, resulting in rapid heat absorption through an in situ endothermic reaction and suppression of further temperature rise and undesirable thermal runaway. In a standard nail penetration test, the temperature rise was reduced by 74% without compromising electrochemical performances. Based on the results, the team suggested in a paper in the ACS journal Nano Letters that this scalable, simple and cost-effective strategy could be extensively applied to various high energy-density devices to ensure human safety.
Electrochemical Society and Toyota announce fellowship winners for projects in green energy technology
July 15, 2015
The ECS Toyota Young Investigator Fellowship Selection Committee has selected three recipients who will receive $50,000 each for the inaugural fellowships for projects in green energy technology. The winners are Professor Patrick Cappillino, University of Massachusetts Dartmouth; Professor Yogesh (Yogi) Surendranath, Massachusetts Institute of Technology; and Professor David Go, University of Notre Dame.
The Electrochemical Society (ECS), in partnership with the Toyota Research Institute of North America (TRINA), a division of Toyota Motor Engineering & Manufacturing North America, Inc. (TEMA), launched the inaugural ECS Toyota Young Investigator Fellowship about six months ago. More than 100 young professors and scholars pursuing innovative electrochemical research in green energy technology responded to ECS’s request for proposals.
ELIX Wireless introduces MDC-based 10kW wireless charging solution
ELIX Wireless introduced the E10K Wireless Charging System, a wireless charging solution that delivers a full 10kW of wireless power transfer. The E10K Wireless Charging System is based on ELIX Wireless’ patented Magneto-Dynamic Coupling (MDC) technology. MDC, developed at the University of British Columbia, is based on two rotating permanent magnets in transmitter and receiver, rather than resonant inductive technology. (Earlier post.) ELIX Wireless rolled out its initial product offering, the E1K Wireless Charging System, to customers in early 2015. The E10K Wireless Charging System is now commercially available to customers and partners.
Typical wireless charging solutions available in the market today are based on inductive technologies and deliver up to 7.7kW. To meet the demand for a faster, higher power wireless charging solution that can operate under extreme environmental conditions, ELIX Wireless developed the E10K Wireless Charging System. E10K “building blocks” can be combined together to create even higher power systems.
Arkema and Hydro-Québec set up a joint laboratory for lithium-ion batteries
July 10, 2015
Arkema, a €7.5-billion (sales) global chemical company and France’s leading chemicals producer, and Hydro-Québec, through its new subsidiary SCE France, are partnering to create a joint laboratory for research and development in the energy storage sector. (Earlier post.)
The laboratory will focus its work on the development of a new generation of materials for the manufacture of lithium-ion batteries, in particular new electrolytes (solvents, lithium salts, etc.) and conduction agents (carbon nanotubes, conductive polymers, etc.).
New rationally designed high-performance Li-S cathode; rate performance, capacity and long life
Researchers in China report the development of a rationally designed Li−S cathode consisting of a freestanding composite thin film assembled from sulfur nanoparticles, reduced graphene oxide (rGO), and a multifunctional additive poly(anthraquinonyl sulfide) (PAQS): nano-S:rGO:PAQS.
The resulting cathode exhibits an initial specific capacity of 1255 mAh g−1 with a decay rate as low as 0.046% per cycles over 1,200 cycles. Importantly, the nano-S:rGO:PAQS batteries exhibit significant rate performances. They maintain a reversible capacity of ∼615 mAh g−1 at a rate of 13.744 A g−1 (=8 C) after more than 60 cycles at various rates and can still have a reversible capacity of ∼1000 mAh g−1 when further cycled at 0.25 C. A paper explaining their work appears in the ACS journal Nano Letters.
Saft Li-ion battery system to power ExoMars Rover; >€1M contract
July 09, 2015
|ExoMars Rover. Click to enlarge.|
Saft has signed a contract worth more than €1 million (US$1.1 million) from Airbus Defence and Space Ltd (UK) to develop, to qualify and to test a specific lithium-ion (Li-ion) battery system to power the ExoMars Rover vehicle. The Rover is the key component of the ExoMars Programme, run jointly by the European Space Agency (ESA) and Roscosmos, the Russian Federal Space Agency. Thales Alenia Space Italia SpA is the ExoMars prime contractor.
The objective of the ExoMars Programme is to search for evidence of current or extinct life on the red planet as part of a branch of science called exobiology. The 300 kg (661 lbs) Rover will land on the surface of Mars before moving between a number of sites and drilling into the surface to capture samples for analysis by its onboard scientific instruments.
BioSolar extends agreement with UCSB for further development of novel polymer cathode; projecting up to 459 Wh/kg and $54/kWh for Li-ion cells
July 07, 2015
Startup BioSolar, Inc. has signed an agreement to extend the funding of a sponsored research program at the University of California, Santa Barbara (UCSB), to further develop its “super battery” technology—a novel polymer cathode that leverages fast redox-reaction properties rather than conventional lithium-ion intercalation chemistry to enable rapid charge and discharge.
The lead inventors of the technology are UCSB professor Dr. Alan Heeger, the recipient of a Nobel Prize in 2000 for the discovery and development of conductive polymers, and Dr. David Vonlanthen, a project scientist and expert in energy storage at UCSB. Both are scientific advisors to BioSolar.
New safety test environment for high-speed flywheels for energy storage systems; new high-speed imaging techniques
The Ricardo-led FlySafe research collaboration—involving a range of leading industrial and academic partners including the University of Brighton’s Centre for Automotive Engineering—has delivered an innovative flywheel safety test environment to enable the development of next-generation flywheel energy storage systems.
The FlySafe project is investigating the potential failure mechanisms and behaviors of high-speed flywheel systems. Operating at extremely high rotational speeds, these systems offer a practical and potentially cost-effective mechanical means of saving fuel and reducing carbon emissions through the mechanical storage and reuse of energy in applications such as regenerative braking. The FlySafe research aims to provide best-practice design guidelines for the safety containment systems of high speed flywheels, appropriate for commercial mass market deployment of these systems. A key output of the project in this respect will be a proposed BSI flywheel safety standard.
Skeleton Technologies launches new range of high-performance ultracapacitors; up to 111 kW/kg and 9.6 Wh/kg; hybrid truck application coming
June 30, 2015
Skeleton Technologies (earlier post) has launched a new range of cylindrical ultracapacitors that offers specific power performance of up to 111 kW/kg (SC450, 450F) and specific energy up to 9.6 Wh/kg (SC4500, 4500F) with ESR as low as 0.075 mΩ (SC3000, 3000F)—the highest performance cylindrical cell ultracapacitors in the market.
Through the use of its patented graphene material, the new series features a capacitance of up to 4500 farads (the SC4500 cell). By contrast, the closest competitor product has a capacitance of 3400 farads. Skeleton claims this is the single biggest increase in energy density for ultracapacitors in the past 15 years.
New operando technique shows atomic-scale changes during catalytic reactions in real-time; applications for batteries and fuel cells
A new technique developed by a team of researchers led by Eric Stach at Brookhaven National Laboratory and Anatoly Frenkel at Yeshiva University reveals atomic-scale changes during catalytic reactions in real time and under real operating conditions. An open access paper on the work is published in the journal Nature Communications.
The team used a new microfabricated catalytic reactor to combine synchrotron X-ray absorption spectroscopy and scanning transmission electron microscopy for an unprecedented portrait of a common chemical reaction. The results demonstrate a powerful operando—i.e., in a working state—technique that is generalizable to quantitative operando studies of complex systems using a wide variety of X-ray and electron-based experimental probes. This may have a tremendous impact on research on catalysts, batteries, fuel cells, and other major energy technologies.
New Samsung silicon anode with graphene boosts volumetric capacity of LiCoO2 Li-ion cell 1.5x after 200 cycles; gravimetric capacity the same
June 27, 2015
A team at Samsung Advanced Institue of Technology (SAIT, Samsung’s global R&D hub) reports in an open access paper published in the journal Nature Communications on a new approach to advance high-capacity silicon (Si) anodes for Li-ion batteries (LIBs) to commercial viability, with a particular focus on improving the volumetric capacity of LIBs.
The SAIT team fabricated the anode material by growing graphene directly on a silicon surfaces while avoiding Si carbide (SiC) formation by developing a chemical vapor deposition (CVD) process that includes CO2 as a mild oxidant. The graphene-coated silicon nanoparticles (Gr-Si NPs) reach a volumetric capacity of 2,500 mAh cm−3 (versus 550 mAh cm−3 of commercial graphite), the highest volumetric value among those reported to date for any LIB anodes while exhibiting excellent cycling and rate performance.
NREL: battery second use offsets EV expense, improves grid stability; recommendations
June 24, 2015
|PEV battery life cycle with second use. Source: NREL. Click to enlarge.|
Researchers at the US Department of Energy (DOE) National Renewable Energy Laboratory (NREL) are identifying battery second use (B2U) strategies capable of offsetting vehicle expenses while improving utility grid stability.
Second-use options for automotive “end-of-life” Li-ion battery packs support a broad spectrum of sustainable energy strategies, as they increase the potential for widespread PEV adoption by eliminating end-of-life automotive service costs, in addition to helping utilities support peak electricity demands while building a cleaner, more flexible electricity grid. NREL research confirms that after being used to power a car, a Li-ion battery retains approximately 70% of its initial capacity—making its reuse a valuable energy storage option for electric utilities, before battery materials are recycled.
DOE CEMAC report examines US opportunities in automotive Li-ion batteries
June 23, 2015
With increasing demand for electric and hybrid electric vehicles and with lithium-ion battery (LIB) producers locating in close proximity to automotive manufacturers, the United States has an opportunity in automotive LIBs under certain conditions, according to a new report released by the US Department of Energy’s (DOE) Clean Energy Manufacturing Analysis Center (CEMAC). The current $9-billion global automotive LIB market is expected to reach $14.3 billion by 2020.
As part of its analysis, CEMAC developed a detailed bottom-up cost modeling of regional cell production scenarios based upon total costs that a manufacturer incurs in the high-volume production of LIB cells. Costs captured in the model include all capital, fixed, and variable costs in each country scenario explored. CEMAC then determined a minimum sustainable price (MSP) by analyzing capital expense, COGS, operating expenses, taxes, free cash flows, and required rates of return.
24M emerges from stealth mode with new semi-solid Li-ion cell; <$100/kWh by 2020
June 22, 2015
Stealth-mode battery start-up 24M has introduced its new semi-solid lithium-ion cell. Co-founded by MIT’s Dr. Yet-Ming Chiang, 24M’s Chief Scientist, the company is leveraging existing, preferred energy storage chemistry but using a new cell design with semi-solid (a mixture of solid and liquid phases) thick electrodes and manufacturing innovations to deliver what it says will be up to a 50% reduction in current Li-ion costs. (Dr. Chiang was also a co-founder of A123 Systems; 24M originated as an A123 spinout. Earlier post.)
“Together, our inventions achieve what lithium-ion has yet to do—meet the ultra-low cost targets of the grid and transportation industries. By 2020 our battery costs will be less than $100 a kilowatt-hour (kWh). We’re emerging at the right time with the right technology,” said Throop Wilder, 24M CEO.
Saft to provide 800 kWh Li-ion system for hybrid ferry
Saft has won a contract to supply Li-ion battery systems to Imtech Marine, a leading maritime technology supplier. Two Saft Seanergy systems will be at the heart of the diesel-electric hybrid propulsion system and energy management system for “Hybrid III”, a Roll On Roll Off (RORO) passenger and vehicle ferry designed for use on Scotland’s short sea crossing routes around the Clyde and Hebrides.
The new vessel, currently under construction by Ferguson Marine Engineering Ltd for CMAL (Caledonian Maritime Assets Ltd), will be Scotland’s third hybrid ferry when it enters service in autumn 2016, carrying up to 150 passengers and 23 cars or two HGVs (Heavy Goods Vehicles) with a service speed of 9 knots. (CMAL is currently holding a naming competition for the ferry.)
Toho Tenax’s prepreg helps to cut 1.1MW Tajima Rimac electric racer’s weight
Teijin Limited announced that carbon fiber sheet pre-impregnated with matrix resin, or prepreg, made by Toho Tenax Co., Ltd., the core company of the Teijin Group’s carbon fibers and composites business, is used in the lightweight body of a new 1.1 MW electric racecar operated by Team APEV with Monster Sport. The Tajima Rimac E-Runner Concept_One—driven by Tajima CEO Nobuhiro “Monster” Tajima—will race in the Electric Modified Division in the Pikes Peak International Hill Climb from June 22 to 28.
The racer, developed by Rimac Automobili in collaboration with Monster Sport and Team APEV, is based on an aluminum space frame covered with the carbon fiber composite body panels. A 57 kWh Rimac battery pack powers four Rimac permanent magnet synchronous motors, delivering combined maximum output of 1,100 kW (1,475 hp) and 1,500 N·m (1,106 lb-ft) of torque.
Dahn Lab at Dalhousie signs exclusive 5-year research partnership with Tesla, beginning in 2016
June 18, 2015
Tesla Motor’s Co-founder and Chief Technology Officer JB Straubel signed a 5-year research agreement with Dalhousie University’s Jeff Dahn, Li-ion battery researcher with the Faculty of Science, and his group of students, postdoctoral researchers and technical staff. The work will begin in June of 2016 when the support from 3M and Engineering Research Council of Canada (NSERC) ends. (3M and NSERC have funded Dahn’s Industrial Research Chair in Materials for Advanced Batteries since 1996.)
The new collaboration, a first between the leading American electric vehicle company and a Canadian university, will bring together the teams of Dahn and Tesla’s Director of Battery Technology, Kurt Kelty.
Researchers find synergy between lithium polysulfide and lithium nitrate as electrolyte additives prevent dendrite growth on Li metal anodes
June 17, 2015
Researchers from SLAC and Stanford led by Prof. Yi Cui, with Prof. Yet-Min Chiang (a co-founder of A123 Systems) at MIT, have discovered that a synergetic effect resulting from the addition of both lithium polysulfide and lithium nitrate to ether-based electrolyte prevents dendrite growth on Li-metal anodes and minimizes electrolyte decomposition.
The findings of their study, reported in Nature Communications, allow for re-evaluation of the reactions regarding lithium polysulfide, lithium nitrate and lithium metal, and provide insights into solving the problems associated with lithium metal anodes. The result could greatly improve the safety of next-generation, high energy density batteries.
Nissan and 4R Energy partner with Green Charge Networks for commercial energy storage featuring second-life EV batteries
June 15, 2015
Nissan Motor Company and Green Charge Networks, a provider of commercial energy storage, are partnering to deploy second-life Li-ion vehicle batteries for stationary commercial energy storage in the US and international markets. General availability is targeted for Q4 2015.
With more than 178,000 sales since its launch in late 2010, Nissan LEAF is the world’s top-selling electric vehicle. As part of the company’s commitment to sustainability and reducing greenhouse gas emissions, Nissan has conducted multiple research projects in Japan, the US and Europe to use the 24 kWh LEAF battery packs outside the vehicle through 4R Energy, a joint-venture with Sumitomo Corp. formed in 2010. (Earlier post.)
Tsinghua team develops high-efficiency and high-stability Li metal anodes for Li-sulfur batteries
June 14, 2015
Researchers from Tsinghua University have developed what they call a “promising strategy” to tackle the intrinsic problems of lithium metal anodes for Lithium sulfur batteries—dendritic and mossy metal depositing on the anode during repeated cycles leading to serious safety concerns and low Coulombic efficiency.
As described in a paper published in the journal ACS Nano, the researchers devised a nanostructured graphene framework coated by an in situ formed solid electrolyte interphase (SEI) with Li depositing in the pores (SEI-coated graphene, SCG). The graphene-based metal anode demonstrated superior dendrite-inhibition behavior in 70 hours of lithiation, while a control cell with a copper foil-based metal anode short-circuited after only 4 hours of lithiation at 0.5 mA cm–2.
A closer look at Audi’s new R8 e-tron EV and battery
June 12, 2015
The model line-up of the second generation of Audi’s high-performance R8 sports car, unveiled at the Geneva Motor Show earlier this year, includes the new R8 e-tron battery-electric vehicle. (Earlier post.) The new R8 e-tron delivers 340 kW (456 hp) of power; acceleration from 0 to 100 km/h (62.1 mph) in 3.9 seconds; and a driving range of up to 450 km (279.6 mi). Range for the first generation R8 e-tron was was 215 km (133.6 mi).
Available for order this year upon customer request, the new R8 e-tron uses a newly developed high energy density Li-ion technology optimized for a purely electric vehicle drive. Li-ion cell energy density was increased from 84 to 152 Wh/kg; in comparison to the first technology platform, the battery capacity has grown from 48.6 kWh to 90.2 kWh—without changing the package.
Lux: China’s advanced energy storage market to quadruple to $8.7B in 2025; 85% share by transport
June 11, 2015
Driven by environmental problems, a growing auto industry, and a big policy push, China’s advanced energy storage market will be worth $8.7 billion in 2025, more than quadrupling from the current $1.7 billion, according to a new report from Lux Research called “Clearing the Haze: Demystifying Energy Storage Opportunities in China”.
Transport applications will dominate with $7.4 billion, or 85% share of the revenues. Stationary applications will earn $1.3 billion. Overall, revenues will grow slower than volumes on account of continually falling battery and systems prices.
Sumitomo Chemical to more than double PERVIO Li-ion separator production capacity; supplier to Panasonic, Tesla
Sumitomo Chemical will more than double its production capacity for lithium-ion secondary battery separators, marketed under the PERVIO brand name. The production at its Ohe Works in Niihama, Japan will be raised to approximately 1.3 times the current capacity by next spring. In April 2014, Sumitomo began expanding Ohe Works’ capacity for Previo by approximately 1.7 times in the spring of 2014, approximately 1.9 times in the fall of 2014, and approximately 2.3 times by the spring of 2015.
In addition, Sumitomo will build a new plant for PERVIO at its subsidiary in South Korea, scheduled to start commercial-scale production in 2017.
Leclanché to provide 4.2 MWh Li-ion battery pack to Green Ferry Project electric ferryboat
Swiss battery manufacturer Leclanché has been selected as the Li-ion battery system supplier for a battery-electric ferryboat to be built by Danish shipbuilder Søby Shipyard Ltd. The ferry will be placed in service in June 2017 to transport vehicles and passengers between island Ærø and the mainland in Denmark.
Leclanché is a joint partner in the Green Ferry Project and will deliver a full-electric drive train to the ferry with its partner Visedo. The ferry will be equipped with a 4.2 MWh battery system from Leclanché, making the boat the world’s largest ferry in terms of battery capacity. As one of the Top 5 projects in the EU Horizon 2020 initiative, a program with a total budget of €21 million (US$24 million), this initiative is part of the Danish Natura project.
Infineon heading up 3 major related EU electromobility research projects; ~$75M in total funding
June 10, 2015
The European Commission is launching three new related research projects aimed at making electromobility cheaper, more efficient and more reliable in order to facilitate more electric vehicles on Europe’s roads. Europe will be the site for the continued development and production of electric vehicles under these projects, which will run until 2018 and are headed by Infineon Technologies AG. Total funding for the three research initiatives is about €67 million (US$75 million).
As a result of the three research projects 3Ccar, OSEM-EV and SilverStream, electrical systems used in electric vehicles will benefit from being approximately one-fifth more compact and lighter; their range improved; and their cost lowered by about 25%. The three projects will collaborate to research and develop environmentally-friendly, safe and robust electric vehicles. The entire automotive value chain is contributing to this effort, from chip producers to car manufacturers.
UT Austin team achieves best reported full-cell hybrid Li-air battery cycling with new ordered catalyst
June 05, 2015
|Cycling performance of the hybrid Li− air batteries with (top) ordered Pd3Fe/C air electrode and (bottom) conventional Pt/C air electrode. Credit: ACS, Cui et al. Click to enlarge.|
A team from the University of Texas at Austin led by Professor John Goodenough has achieved significantly enhanced activity and durability for the oxygen reduction reaction under alkaline conditions in a hybrid Li-Air battery using a new ordered Pd3Fe/C catalyst. The new catalyst exhibits much higher activity and durability than disordered Pd3Fe/C, Pd/C, and Pt/C.
As reported in a paper in the Journal of the American Chemical Society, the new ordered Pd3Fe/C catalyst enables long-term cycling performance of hybrid Li−air batteries over 880 hours (220 cycles) with only a 0.08 V increase in round-trip overpotential. The extraordinarily high performance of ordered Pd3Fe/C catalyst provides a very promising alternative to the conventional Pt/C catalyst for an air cathode in alkaline electrolyte, they concluded.
A123 Systems to invest additional $200+ M to double Li-ion manufacturing capacity; current facilities running at full utilization
June 02, 2015
A123 Systems LLC, a developer and manufacturer of advanced lithium-ion batteries and systems, plans to double global manufacturing capacity to 1.5 GWh within the next 3 years. The company operates manufacturing hubs in the state of Michigan; Hangzhou, China; and Changzhou, China. All three are now operating at capacity due to considerable growth in demand.
While the company is currently in the midst of a $100-million capital expansion across its manufacturing network, A123 has recognized that the existing investment plan must be substantially expanded to satisfy much stronger market demand for its products. The company currently forecasts growth of more than 50% this year. The new investment program of an additional $200+ Million will be installed in phases over the next three years, with additional investments anticipated as target markets further develop.
Overhead fast charging system for electric buses from Fraunhofer and partners
June 01, 2015
Researchers from the Fraunhofer Institute for Transportation and Infrastructure Systems IVI and its several partners in the EDDA Bus project, have developed a pantograph fast-charging solution for electric buses that supports route-based opportunity charging. Operational system testing of a converted bus and its charging station began in Dresden in November last year.
The solution is based on four core technologies: the Dresden-based company M&P GmbH designed a charging station with very high charging capacities; HOPPECKE Advanced Battery Technology GmbH supplied special batteries designed for such high power capacities; Vossloh Kiepe GmbH was responsible for adapting the power electronics; and the contact system located on the roof of the bus was realized by Fraunhofer IVI together with Schunk Bahn- und Industrietechnik GmbH.
Toyota Research team reports significant advance in electrolytes for high-energy Mg batteries
A team at Toyota Research Institute of North America (TRINA) reports a critical advance in the the development of electrolytes for magnesium (Mg) batteries in the journal Angewandte Chemie. The researchers, led by Dr. Rana Mohtadi, Principal Scientist at TRINA, developed an electrolyte based on a simple-type magnesium monocarborane salt (MMC) that is compatible with Mg metal (> 99 % coulombic efficiency); possesses high anodic stability (3.8 V vs. Mg); and is non-corrosive. By contrast, state-of-the-art Mg electrolyte systems are complex, halogen-based, and corrosive.
The properties of the new electrolyte, coupled with its “inert and benign character”, make MMC-based electrolytes well-suited for future Mg batteries, the scientists said. The development of this non-corrosive electrolyte enabled the first demonstration of a high voltage coin cell battery, previously prohibited using all known systems. “This achievement is a turning point in the research and development of Mg electrolytes that has deep implications on realizing practical rechargeable Mg batteries,” the scientists wrote.
Stanford team develops new ultrahigh surface area 3D porous graphitic carbon material for improved energy storage
Stanford University scientists have created a new ultrahigh surface area three-dimensional porous graphitic carbon material that significantly boosts the performance of energy-storage technologies. Their results are presented in an open access paper published in the journal ACS Central Science.
The multivalent cross-linker and rigid conjugated framework help to maintain micro- and mesoporous structures, while promoting graphitization during carbonization and chemical activation. The design results in a class of hierarchically porous graphitic (HPG) carbons at temperature as low as 800 °C with record-high surface area (4,073 m2 g–1); large pore volume (2.26 cm–3), and hierarchical pore architecture. The maximum surface area achieved with conventional activated carbon is about 3,000 m2 g–1
University of Maryland team creates solid-state Li-ion battery out of one material
May 29, 2015
|UMD Engineers made a battery of all one material simply by sprinkling carbon (red) into each side of a new material (blue) that forms the electrolyte and both electrodes at the ends of the battery. Credit: Maryland NanoCenter Click to enlarge.|
Engineers at the University of Maryland have created a solid-state Li-ion battery that is made entirely out of one material. Chunsheng Wang, a professor in the University of Maryland’s Department of Chemical and Biomolecular Engineering, and his team have made a single material that incorporates the properties of both electrodes (cathode and anode) and electrolyte.
The new material consists of a mix of sulfur, germanium, phosphorus and lithium (Li10GeP2S12). This compound is used as the ion-moving electrolyte. At each end, the scientists added carbon to form electrodes that push the ions back and forth through the electrolyte as the battery charges and discharges. The Li–S and Ge–S components in Li10GeP2S12 act as the active centers for its cathode and anode performance, respectively.
Daimler enters stationary energy storage market with ACCUmotive battery systems; 500 kWh unit already on line for grid stabilization
Daimler is entering the commercial and residential stationary energy storage system (ESS) market with its wholly-owned subsidiary Deutsche ACCUmotive. The announcement comes four weeks after Tesla Motors announced its own entry into the ESS market with the home PowerWall Li-ion battery system (earlier post), although Daimler has been considering the move for several years.
Daimler’s first industrial-scale lithium-ion unit is already on the grid and is being operated by the partner companies The Mobility House AG and GETEC Energie AG. The 96-module ESS currently has a total capacity of more than 500 kWh; it will be increased step-by-step to 3000 kWh by the partners in the coming weeks. Daimler AG is planning to collaborate with EnBW AG for distribution to customers in Germany. Daimler is also aiming to enter into cooperation with other sales and distribution partners both in Germany and at international level.
DOE announces $26.6M SBIR/STTR FY15 Phase 1 Release 2 awards; fuel cells, batteries, power electronics and efficient combustion engines
May 28, 2015
The US Department of Energy (DOE) has selected 162 projects to receive about $26.6 million in the 2015 Small Business Innovation Research and Small Business Technology Transfer (SBIR/STTR) Phase I Release 2 Awards. (Earlier post.) Of these, 16 are vehicle-related, encompassing projects developing batteries, power electronics and improved combustion engine technology including on-board reformers, and two are specifically hydrogen fuel cell-related.
Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) are Federal programs in which agencies with large research and development (R&D) budgets set aside a small fraction of their funding for competitions among small businesses only. Small businesses that win awards in these programs keep the rights to any technology developed and are encouraged to commercialize the technology. While the original charter of the program focused on technological innovation, the current programs have evolved to have a greater focus on commercialization.
U Waterloo team identifies key reaction in sodium-air batteries; implications for improving Li-air
Chemists at the University of Waterloo have identified the key reaction that takes place in sodium-air batteries. The researchers from the Waterloo Institute for Nanotechnology, led by Professor Linda Nazar who holds the Canada Research Chair in Solid State Energy Materials, have described a key mediation pathway that explains why sodium-oxygen batteries are more energy efficient when compared with their lithium-oxygen counterparts.
Understanding how sodium-oxygen batteries work has implications for developing the more powerful lithium-oxygen battery, which has been proposed by some as the “holy grail” of electrochemical energy storage.
New promising solid-state electrolyte for rechargeable Li-metal batteries
May 22, 2015
|The new solid-state electrolyte shows electrochemical stability up to 10 V vs Li/Li+. Credit: ACS, Rangasamy et al. Click to enlarge.|
A team led by researchers from Oak Ridge National Laboratory (ORNL) has developed a promising solid-state electrolyte for use in advanced rechargeable batteries with Li-metal anodes: a Li7P2S8I phase that exhibits the characteristics of a solid solution between Li3PS4 and LiI with fast ion conduction and electrochemical stability up to 10 V vs Li/Li+. A paper describing the work is published in the Journal of the American Chemical Society.
The material has room-temperature ionic conductivity of up to 6.3 × 10−4 S cm−1—400% higher than that of β-Li3PS4 and more than 3 orders of magnitude higher than that of LiI. It also is very compatible with a Li metal anode; the presence of I enhances the stability of the electrolyte with metallic Li anode while demonstrating low charge-transfer resistance.
AllCell and LG develop high-performance Li-ion battery for material handling market
May 21, 2015
AllCell Technologies, LLC, a Chicago-based Lithium-ion battery pack manufacturer for smart-grid, autonomous and light electric vehicle applications, and LG Chem Ltd. have developed a high performance long lasting Li-ion battery for material handling applications. The battery is built with LG’s cylindrical 18650-format Li-ion batteries and AllCell’s proprietary passive thermal management technology with phase change composite (PCC) (earlier post).
The battery is designed as a drop-in replacement for lead-acid batteries with fast charge/discharge capabilities, 4-5 times longer life, robust fuel gage, hot environment resilience, and no standard maintenance requirements.
Hitachi Automotive Systems supplying 5 kW/kg high power density prismatic Li-ion cells for MY 2016 Malibu Hybrid
May 20, 2015
Hitachi Automotive Systems, Ltd. will supply 5,000 W/kg high power density prismatic lithium-ion battery cells for the new MY 2016 Chevrolet Malibu Hybrid (earlier post). Featuring a new full-hybrid powertrain which leverages technology from the Chevrolet Volt, the 2016 Malibu Hybrid will offer an estimated combined fuel economy rating exceeding 45 mpg (5.22 l/100 km).
The Hitachi Li-ion cells employ heat resistant separators to ensure the ionic conductivity between the electrodes, achieving not only a high output power density of 5,000W/kg, but also a high level of safety. In addition to this, the battery’s ability to maintain its high output power density in GM evaluations, even under extremely low temperatures such as the -30 ˚C cold region test, led to its adoption.
Saft introduces Li-ion drop-in replacement for lead-acid batteries in military vehicles: XCELION 6T
|Saft Xcelion 6T. Click to enlarge.|
Saft has introduced its Xcelion 6T battery for powering military vehicles. The Xcelion 6T is a lithium-ion (Li-ion) drop-in replacement for lead-acid batteries that provides equivalent power of two lead-acid batteries at a quarter of the weight and half the volume. (Earlier post.)
The launch signals the conclusion of a two-year industrialization program, in which Saft successfully reduced the cost of the Xcelion 6T to increase its commercialization and create a versatile off-the-shelf product.
Lux Research: Li-ion battery costs to drop to as low as $172/kWh by 2025; big boost for EVs in mid- to late 2020s
May 19, 2015
The electric vehicle opportunity is set to expand, as leading battery developers such as Panasonic drive down prices of Li-ion battery packs by 35% to $172/kWh in 2025, according to a new report, “Crossing the Line: Li-ion Battery Cost Reduction and Its Effect on Vehicles and Stationary Storage,” by Lux Research. However, only the best-in-class players will achieve that cost threshold, while others lag at $229/kWh.
The estimate is based on a new bottom-up cost model built by Lux Research in an industry known for being highly secretive about its costs. The model accounts for differences in battery chemistry, form factor, production scale, location and other nuances.
Faradion demonstrates proof-of-concept sodium-ion electric bike
May 15, 2015
|E-bike powered by Faradion prototype Na-ion battery pack. For the proof-of-concept, the cells were manufactured to be larger than necessary to avoid unnecessary costs and lengthy manufacturing processes at this early stage. Click to enlarge.|
British battery R&D company Faradion has demonstrated a proof-of-concept electric bike powered by sodium-ion batteries at the headquarters of Williams Advanced Engineering, which collaborated in the development of the bike. Oxford University was also a partner. Although lithium-ion batteries are currently the predominant battery technology in electric and hybrid vehicles, as well as other energy storage applications, sodium-ion could offer significant cost, safety and sustainability benefits.
Sodium-ion intercalation batteries—i.e., batteries using the same process of ion insertion and removal as in Li-ion batteries—have been discussed in the literature for some time. (e.g., Earlier post.) Using sodium instead of lithium in a battery is attractive because it could potentially be much less expensive (~30% less) and safer, and it would be more environmentally benign. However, developing efficient Na+ intercalation compounds is a challenge because sodium ions are much larger than lithium ions—about 70% larger in radius. Thus, insertion/deinsertion of sodium ions in a host material is much more difficult than that of lithium ions.
Volkswagen Group to offer more than 20 electric vehicle models in China “in near future”
May 05, 2015
The Volkswagen Group plans to offer more than 20 electric vehicle models—from small cars to large sedans and SUVs, plug-in hybrids and battery-electric vehicles—to Chinese customers “in the near future,” according to Prof. Dr. Jochem Heizmann, Member of the Group Board of Management with responsibility for China, in a special essay published in the Environment section of the company’s newly released sustainability report.
The Chinese government has set guidelines to reduce CO2 emissions in China to a fleet fuel consumption of 5 l/100 km (47 mpg US) as measured on the New European Driving Cycle (NEDC) by 2020. The expected fleet average this year is 6.9 l/100 km (34 mpg US). Thus, the government is requiring an overall reduction of about 28%, or 6.2% per year, between 2015 and 2020. Meeting this target will be even more challenging than meeting the 95 g/km target for 2020 set by the European Union, writes Dr. Heizmann, explaining:
New bendable and thin sulfide solid electrolyte films enable higher performance solid-state Li-ion batteries
May 02, 2015
|Schematic diagram of new cell. Credit: ACS, Nam et al. Click to enlarge.|
Researchers in South Korea have developed free-standing and stackable all-solid-state lithium batteries (ASLBs) with high energy density and high rate capabilities. A paper on their work is published in the ACS journal Nano Letters.
To make the batteries, the team developed bendable and thin sulfide solid electrolyte (SE) films reinforced with a mechanically compliant poly(paraphenylene terephthalamide) non-woven (PPTA NW) scaffold. With thin (∼70 μm) NW-reinforced SE film, the new solid state batteries show up to a 3-fold increase of the cell-energy-density to 44 Wh kgcell−1), compared to that of a conventional all-solid-state cell without the NW scaffold.
UC Berkeley/Berkeley Lab teams develops high-rate, long-life Li-S battery with Li2S-graphene cathode
May 01, 2015
|Li2S/GO@C Nanosphere. Credit: ACS, Hwa et al. Click to enlarge.|
Researchers with appointments at both UC Berkeley and Lawrence Berkeley National Laboratory have developed a high-rate and long-life Li-sulfur battery cell. The cathode material is a core–shell nanostructure comprising Li2S nanospheres with an embedded graphene oxide (GO) sheet as a core material and a conformal carbon layer as a shell.
The Li2S/GO@C cathode exhibits a high initial discharge capacity of 650 mA·h g–1 of Li2S (corresponding to the 942 mA·h g–1 of S) and very low capacity decay rate of only 0.046% per cycle with a high Coulombic efficiency of up to 99.7% for 1500 cycles when cycled at the 2 C discharge rate. A paper on their work is published in the ACS journal Nano Letters.
Tesla launches line of Li-ion stationary storage systems for homes and businesses: POWERWALL and POWERPACK
|Multiple POWERWALL units may be combined. Click to enlarge.|
As widely expected, Tesla CEO Elon Musk unveiled the company’s new product line: scalable stationary battery systems for homes, businesses and beyond. Available for immediate order on the Tesla Web site (teslaenergy.com or teslamotors.com/powerwall) is the modular wall-mounted POWERWALL system, which is targeted at homes and perhaps some small commercial applications, Musk said. Delivery is projected for sometime later this summer (3-4 months from now.)
The sleek, sculpture-like Li-ion packs come in 7 kWh ($3,000) and 10 kWh ($3,500) configurations. Both are guaranteed for 10 years (with an optional 10-year extension), and can be combined to up to 9 units—i.e., up to 90 kWh of storage. The packs contain all the integrated safety systems, the liquid thermal control and the DC/DC converter, and work with solar systems straight out of the box, Musk said.
HRL Labs video demonstrates principle of thermal battery based on advanced metal hydrides for EV heating and cooling
April 30, 2015
In 2011, the Advanced Research Projects Agency - Energy (ARPA-E) awarded $2.7 million to a team comprising researchers from the University of Utah, HRL Laboratories and GM Global R&D for a project to develop a new generation of high-density thermal battery based on advanced metal hydrides. (Earlier post.) The goal of the project, part of ARPA-E’s HEATS (High Energy Advanced Thermal Storage) portfolio, was to develop a compact thermal battery for climate control in electric vehicles. Such a thermal battery would provide heating and cooling without draining the electric battery, in effect, extending the driving range of EVs per electric charge.
As described in a paper in press in the Journal of Alloys and Compounds, the developed system uses a pair of thermodynamically matched metal hydrides as energy storage media: (1) catalyzed MgH2 as the high temperature hydride material, due to its high energy density and enhanced kinetics; and (2) TiV0.62Mn1.5 alloy as the matching low temperature hydride. HRL has now released a video demonstrating the principle behind the work on thermal battery technology.
Li-ion maker Electrovaya acquires Evonik Litarion and licenses SEPARION IP
Canada-based Li-ion developer and manufacturer Electrovaya Inc. has completed the acquisition of Evonik Litarion GmbH and the licensing of the ceramic composite separator SEPARION intellectual property from Evonik. The transaction includes an advanced and automated production plant for lithium-ion electrodes and ceramic composite separators, with a rated capacity of 0.5 Gigawatt hours (GWh) of electrodes and 10 million m2 of ceramic separators along with all associated intellectual property.
This transformational acquisition brings Electrovaya best-in-class manufacturing, experienced management and a strong technical team, with the manufacturing capacity to enable Electrovaya to bid on larger energy storage system opportunities worldwide.
PATHION develops new LiRAP-based solid-state electrolytes for Li-sulfur and sodium-ion batteries
April 28, 2015
At the Spring 2015 Materials Research Conference in San Francisco earlier this month, PATHION presented two new derivative superionic solid-state electrolytes built upon LiRAP (Lithium-Rich Anti-Perovskite). PATHION has an exclusive worldwide license for LiRAP from Los Alamos National Laboratories. Supported by an ARPA-E grant, LiRAP has proven to be a safe alternative compared to the liquid electrolytes used in most of today’s lithium ion batteries.
Solid-state electrolytes, unlike liquid-state, have extremely low expansion, no out-gassing, and the elimination of dendrite growth between anode and cathode, although sometimes at the expense of performance. The LiRAP solid electrolytes conduct Li+ ions well at high voltage and high current, providing much enhanced energy density and power capacity as well as safety. PATHION is working on a derivative for Li-sulfur batteries as well as a derivative that could be applied in a sodium-ion battery.
LG Chem and Eguana partner on Li-ion residential energy storage system for North America
April 23, 2015
Eguana Technologies, a supplier of power control and conversion solutions for distributed energy storage systems and Li-ion manufacturer LG Chem have combined their technologies under a multi-year agreement to deliver a certified, fully integrated energy storage system (ESS) Eguana calls “AC Battery”. The modular system is targeted as a residential product, but also has the potential to be aggregated for small commercial and industrial (C&I) end-users.
Basic product capacity is 6.4 kWh. Eguana designed the package around LG Chem’s battery modules and supplies its Bi-Direx inverter and controls subassembly. The low voltage design enables high-capacity batteries to operate in lower power ratings needed for decentralized systems (i.e. residential rooftop solar). Eguana has also worked with Germany-based Sonnenbatterie on a similar ESS solution.
NRC report recommends ways to overcome barriers hindering purchases of PEVs; vehicle cost, battery tech and consumer knowledge among others
April 22, 2015
Vehicle cost, current battery technology, and inadequate consumer knowledge are some of the barriers preventing widespread adoption of plug-in electric vehicles, according to a new congressionally mandated report from the National Research Council. Developing less expensive, better performing batteries is essential to reducing overall vehicle cost, and a market strategy is needed to create awareness and overcome customer uncertainty, the report finds. The report recommends a range of incentives that the federal government can offer to address these and other barriers.
The premise of the report—“Overcoming Barriers to Deployment of Plug-in Electric Vehicles”—is that there is a benefit to the United States if a higher fraction of vehicle miles traveled is fueled by electricity rather than by petroleum due to the resulting reduction in dependence on petroleum and reduction in emissions of greenhouse gases and criteria pollutants. The task of the committee of experts and stakeholders writing the report was (1) to identify market barriers slowing the purchase of PEVs and hindering the deployment of supporting infrastructure in the United States and (2) to recommend ways to mitigate those barriers.
Maxwell Technologies introduces 24V ultracap-based Engine Start Modules for off-road and industrial equipment
Maxwell Technologies, Inc. is introducing two 24-volt versions of its ultracapacitor-based Engine Start Module (ESM). (Earlier post.) The new higher voltage ESM is suited for improving equipment uptime and power reliability in buses and industrial vehicles such as cranes, backhoes, bulldozers, graders, pavers, off-road trucks, portable compressors and others with diesel engines. The 24-volt ESM enables vehicles to start and operate reliably in the face of cold weather and infrequent starting.
There are two models of the 24-volt ESM: the ULTRA 31/900/24V for starting diesel engines up to 12.5 liters, and the ULTRA 31/1100/24V for engines up to 15.0 liters. Both are packaged in BCI Group 31 form factor.
Systematic review of EV battery pack costs suggests economies of scale may push cost toward US$200/kWh without further cell chemistry improvements
April 20, 2015
Industry-wide cost estimates for battery packs for electric vehicles have declined by approximately 14% annually between 2007 and 2014, from above US$1,000 per kWh to around US$410/kWh, according to a systematic review of more than 80 different estimates by a team from the Stockholm Environment Institute. Further, they reported in their paper published in Nature Climate Change, the cost of battery packs used by market-leading BEV manufacturers are even lower at US$300/kWh, and has declined by 8% annually.
The results further suggest that it is possible that economies of scale will continue to push cost towards US$200/kWh in the near future even without further cell chemistry improvements. Their study, said Björn Nykvist and Måns Nilsson, has significant implications for the assumptions used when modeling future energy and transport systems and permits an optimistic outlook for BEVs contributing to low-carbon transport.
New Li-S battery shows cycle performance comparable to that of Li-ion batteries along with more than double the energy density
April 13, 2015
A team of researchers in South Korea and Italy has demonstrated a highly reliable lithium–sulfur battery showing cycle performance comparable to that of commercially available lithium-ion batteries while offering more than double the energy density. The team, led by a group from Hanyang University, used a highly reversible dual-type sulfur cathode (solid sulfur electrode and polysulfide catholyte) and a lithiated Si/SiOx nanosphere anode.
In a paper in the ACS journal Nano Letters , they reported that the lithium–sulfur cell showed superior battery performance in terms of high specific capacity, excellent charge–discharge efficiency, and remarkable cycle life, delivering a specific capacity of ∼750 mAh g–1 over 500 cycles (85% of the initial capacity). These promising behaviors may arise from a synergistic effect of the enhanced electrochemical performance of the newly designed anode and the optimized layout of the cathode, they suggested.
MIT and Moscow State University collaborating on advanced batteries, metal-air batteries and reversible fuel/electrolysis cells
April 12, 2015
Researchers at the Skoltech Center for Electrochemical Energy Storage (CEES), a partnership between the MIT Materials Processing Center and Lomonosov Moscow State University, are focusing on the development of higher capacity batteries. CEES is a Center for Research, Education and Innovation (CREI) under the umbrella of the Skolkovo Institute of Science and Technology (Skoltech).
CEES has three main research thrusts: the development of advanced lithium-ion and multivalent ion batteries; the development of rechargeable metal-air batteries; and Development of reversible low and elevated temperature fuel cells
Vertically aligned sulfur-graphene nanowall cathodes for Li-sulfur batteries deliver high capacity and rate performance
April 11, 2015
A team at Beihang University in China has synthesized cathode materials for Li-sulfur batteries consisting of vertically aligned sulfur–graphene (S-G) nanowalls on electrically conductive substrates. In each individual S-G nanowall, the sulfur nanoparticles are homogeneously anchored between graphene layers; ordered graphene arrays arrange perpendicularly to the substrates, enabling fast diffusion of both lithium ions and electrons.
As reported in their paper in the ACS journal Nano Letters, the cathodes achieve a high reversible capacity of 1261 mAh g–1 in the first cycle and more than 1210 mAh g–1 after 120 cycles with excellent cyclability and high-rate performance (more than 400 mAh g–1 at 8C, 13.36 A g–1). This is the best demonstrated rate performance for sulfur–graphene cathodes to date, according to the team.
A123 Systems introduces Gen3 Li-ion 12V starter battery; 25% greater cold-cranking power (voltage corrected)
April 07, 2015
|12V Li-Start battery. Click to enlarge.|
Li-ion battery developer and manufacturer A123 Systems has introduced the third generation of its 12 Volt Starter Battery in its Li-Start product line.
Every component of this third-generation battery system has been optimized for low voltage automotive applications. Together these advances, known as A123’s new UltraPhosphate technology, have achieved more than 25% greater cold cranking power and result in a product that significantly outperforms the best lead-acid batteries in industry standard cranking tests. The Gen 3 battery is also smaller than its predecessors.
ORNL VIBE open-architecture framework for improved EV battery design
April 06, 2015
|VIBE provides an open architecture framework for pre-experimental design simulation as part of the CAEBAT program. Click to enlarge.|
As part of the US Department of Energy’s (DOE) CAEBAT (Computer Aided Engineering for Batteries) activities (earlier post), scientists at Oak Ridge National Laboratory (ORNL) have developed a flexible, robust, and computationally scalable open-architecture framework that integrates multi-physics and multi-scale battery models.
The Virtual Integrated Battery Environment (VIBE) allows researchers to test lithium-ion batteries under different simulated scenarios before the batteries are built and used in electric vehicles. The physics phenomena of interest include charge and thermal transport; electrochemical reactions; and mechanical stresses. They operate and interact across the porous 3D structure of the electrodes (cathodes and anodes); the solid or liquid electrolyte system; and the other battery components. VIBE was developed by researchers in ORNL’s Computational Engineering & Energy Sciences group, led by Dr. John Turner.
Berkeley Lab/UC Berkeley study shows EV batteries meet daily travel needs of 85%+ of US drivers even after 20% energy capacity fade; calls for new EOL criteria
March 31, 2015
A new study by researchers from Lawrence Berkeley National Laboratory (Berkeley Lab) and UC Berkeley shows quantitatively that EV batteries can continue to meet daily travel needs of drivers well beyond the 80% floor for remaining energy storage capacity that is commonly assumed. An open access paper on their work, which applied detailed physics-based models of EVs with data on how drivers use their cars, is published in the Journal of Power Sources.
The study also sheds light on a number of other factors concerning battery use and energy and power fade, including that even EV batteries with substantial energy capacity fade continue to provide sufficient buffer charge for unexpected trips with long distances; that enabling charging in more locations, even if only with 120 V wall outlets, prolongs the useful life of EV batteries; and that EVs meet performance requirements even down to 30% remaining power capacity.
LG Chem to supply EV batteries to Daimler for new smart EV
March 30, 2015
Daimler AG has selected LG Chem as the supplier of lithium-ion batteries for the smart EV that will be newly launched in 2016. Under the contract, LG Chem will provide battery cells to smart EV; Daimler will assemble the cells into the vehicle packs.
By signing a supply contract with Daimler, LG Chem has become the world’s biggest automotive battery supplier, having at least 13 global automakers among the top 20 global brands. In addition to Daimler, top automakers Volkswagen, Ford, Hyundai, Renault, Audi, Chevrolet, Kia, and GM use LG Chem batteries for EV applications.
Dalhousie team reports ternary blends of electrolyte additives greatly enhance performance of NMC Li-ion cells
Batteries for electrified vehicles require much longer calendar and cycle lifetimes, as well as improved high temperature tolerance, than their portable consumer electronics counterparts. Electrolyte additives can be used to extend cell lifetime by suppressing parasitic reactions between charged electrodes and electrolyte by modifying the solid electrolyte interphase (SEI) at the negative electrode or the passivation layer formed on the positive electrode.
Researchers at Dalhousie University (Canada) led by Dr. Jeff Dahn now report that Li[Ni1/3Mn1/3Co1/3]O2 (NMC111)/graphite and Li[Ni0.42Mn0.42Co0.16]O2 (NMC442)/graphite pouch cells demonstrate greatly enhanced performance when ternary blends of electrolyte additives are added to the cells. Their work is published in a paper in an open access article in the Journal of the Electrochemical Society.
BNL team develops very high capacity ternary metal fluoride cathode material for Li-ion batteries
March 28, 2015
|The team achieved three-times-higher storage capacity through the reversible redox reactions of copper and iron—breaking and reforming copper-fluorine and iron-fluorine bonds while absorbing and releasing lithium. Source: BNL. Click to enlarge.|
A team led by researchers at Brookhaven National Laboratory (BNL) has found that adding copper atoms to iron fluoride—a member of the class of materials called transition metal fluorides that are potential extremely high-capacity cathodes for future Li-ion batteries—produces a group of new fluoride materials that can reversibly store three times as many Li ions as conventional cathode materials. Measurements also indicate that these new materials could yield a cathode that is extremely energy-efficient. Their research is described in an open access paper in the journal Nature Communications.
The capacity of mainstream conventional cathodes (e.g., LiCoO2 or LiFePO4) is low (140–170 mAh g−1) and currently limits the energy density of most commercial cells, the researchers note. Although a number of alternative anodes (such as silicon and tin) show capacities well above 500 mAh g−1, few cathodes have been identified that can the high capacity. However, transition metal fluorides, which contain the element fluorine plus one or more of the transition metals, such as iron and copper, have much higher ion-storage capacities than traditional cathodes.
XALT Energy in major multi-year contract to supply LTO batteries to HK Group for electric buses in China
March 25, 2015
XALT Energy (originally founded in 2009 as Dow-Kokam, LLC), a leading developer and manufacturer of lithium-ion batteries, signed a global exclusive agreement with Hybrid Kinetic Group (HK Group) of China for the supply of its Lithium Titanate (LTO) batteries from its manufacturing facilities in Midland, Michigan for all-electric buses in China.
Production is expected to begin during the third quarter of 2015. The multi-year contract, valued at more than $1.0 billion, will create 300 new high-tech and manufacturing jobs in Midland this year. Hiring is underway with 80 positions expected to be filled in April.
Report: VW Group to decide how to proceed with Quantumscape solid state energy storage by July
March 24, 2015
Bloomberg reports that the Volkswagen Group will decide by July how to proceed with solid state energy storage technology under development by Quantumscape (earlier post), citing Prof. Dr. Martin Winterkorn, Chairman of the Board of Management, who spoke outside a press conference in Stuttgart.
According to the report, Winterkorn said that the technology’s potential to boost the range of battery-powered vehicles is compelling and tests are progressing. “Progress has been made,” he said. Quantumscape several days ago posted 11 job openings, seeking a manager or director of battery manufacturing operations; a process engineering manager to lead a team in the development of a new energy storage technology from initial process concept through demonstration of stable production; and R&D technicians, battery engineers and scientists.
Purdue researchers convert packing peanuts into anode materials for Li-ion batteries; outperforming graphite
March 23, 2015
Purdue researchers have developed a process to manufacture carbon-nanoparticle and microsheet anodes for Li-ion batteries from polystyrene and starch-based packing peanuts, respectively. The work, performed by postdoc Vinodkumar Etacheri, Professor Vilas Pol and undergraduate chemical engineering student Chulgi Nathan Hong, is being presented at the 249th American Chemical Society National Meeting & Exposition in Denver.
Packing-peanut-derived carbon anodes have demonstrated a maximum specific capacity of 420 mAh/g (milliamp hours per gram), which is higher than the theoretical capacity of graphite (372 mAh/g).
Stanford team enhances ionic conductivity of solid electrolyte by 3 orders of magnitude; potential for high-energy Li-ion batteries
March 20, 2015
Stanford researchers led by Professor Yi Cui have used ceramic nanowire fillers to enhance the ionic conductivity of polymer-based solid electrolyte by three orders of magnitude. The ceramic-nanowire filled composite polymer electrolyte also shows an enlarged electrochemical stability window.
Solid-state electrolytes could provide substantial improvements to safety and electrochemical stability in next-generation high-energy Li-ion batteries when compared with conventional liquid electrolytes. However, the low mobility of lithium ions in solid electrolytes has limited their practical application. The Stanford researchers suggest that their discovery, described in the ACS journal Nano Letters, paves the way for the design of solid ion electrolytes with superior performance.
Researchers synthesize new 2D carbon-sulfur MAX-phase-derived material for Li-S battery electrode
March 18, 2015
Drexel researchers, along with colleagues at Aix-Marseille University in France, have synthesized two-dimensional carbon/sulfur (C/S) nanolaminate materials. Covalent bonding between C and S is observed in the nanolaminates, which along with and an extremely uniform distribution of sulfur between the atomically thin carbon layers make them promising electrode materials for Li-S batteries. A paper on their work is published in the journal Angewandte Chemie International Edition.
The international research collaboration led by Drexel’s Dr. Yury Gogotsi produced the nanolaminate by extracting the titanium from a three-dimensional material called a Ti2SC MAX phase. (Earlier post.) The resulting products are composed of multi-layers of C/S flakes, with predominantly amorphous and some graphene-like structures. The paper was selected as a VIP article and will be featured on the journal cover.
Optimized storage principle and new material increase lithium storage density in cathode material
March 16, 2015
An interdisciplinary team of researchers of Karlsruhe Institute of Technology (KIT) and KIT-founded Helmholtz Institute Ulm (HIU) has developed a new Li-ion cathode material based on a new storage principle, resulting in increased energy storage density.
The new material, presented in a paper in the journal Advanced Energy Materials, allows for the reversible storage of 1.8 Li+ per formula unit. With a material of the composition Li2VO2F, storage capacities of up to 420 mAh/g were measured at a mean voltage of 2.5 V. As a result of the comparably high density of the material, a storage capacity of up to 4600 Wh/L relative to the active material was obtained.
PANI-coated sulfur-carbon nanotube composite shows long cycle life for high-capacity Li-S batteries
March 14, 2015
Researchers from Hanyang University in Korea and the University of Maryland have developed a sulfur-carbon nanotube (S/SWNT) composite coated with polyaniline (PANI) polymer as polysulfide block to achieve high sulfur utilization, high Coulombic efficiency, and long cycle life in Li-Sulfur batteries.
As described in a open access paper published in the journal Science Reports, the PANI coated S/SWNT composite showed a superior specific capacity of 1,011 mAh/g over 100 cycles and a good rate retention, demonstrating the synergic contribution of porous carbon and conducting polymer protection to address the challenges facing the sulfur cathode in such systems.
Ultrahigh-capacity anodes derived from natural silk for Li-ion batteries; other energy storage applications
March 13, 2015
Researchers at the Beijing Institute of Technology have found a way to process biomass-derived natural silk to create carbon-based nanosheets that could potentially be used in Li-ion batteries and other energy storage devices. A paper on their work is published in the journal ACS Nano.
They prepared hierarchical porous nitrogen-doped carbon (HPNC) nanosheets (NS) via simultaneous activation and graphitization of the silk. The HPNC-NS show favorable features for electrochemical energy storage such as high specific surface area (SBET: 2494 m2/g); high volume of hierarchical pores (2.28 cm3/g), nanosheet structures; rich N-doping (4.7%), and defects. The team reported a reversible lithium storage capacity of 1865 mAh/g—the highest for N-doped carbon anode materials to the best of the researchers’ knowledge. Used as a supercapacitor electrode in ionic liquid electrolytes, the HPNC-NS exhibit a capacitance of 242 F/g and energy density of 102 Wh/kg (48 Wh/L), with high cycling life stability (9% loss after 10,000 cycles).
XG Sciences silicon graphene anode material shows stability over 400 cycles with 600 mAh/gram
March 10, 2015
XG Sciences (XGS), a leading provider of graphene nanoplatelets, has demonstrated full battery cell cycle stability through more than 400 charge/discharge cycles with a charge storage capacity of 600 mAh/gram over a broad voltage window in its next generation silicon graphene (earlier post) (XG SiG) anode materials for lithium-ion batteries.
“We believe our latest material is the first commercially viable silicon and graphene based anode formulation to achieve this all important performance threshold. With charge storage capacity of up to 4 times today’s typical anodes, first cycle efficiency of 85-90%, low swelling and life that is more than double our previous generation, we believe this material will open many new markets for our customers with an affordable and safe anode formulation,” said Dr. Philip Rose, XGS CEO.
ORNL microscopy directly images lithium dendrite formation in batteries; new technique for studying electrochemical processes
March 06, 2015
Scientists at the Department of Energy’s Oak Ridge National Laboratory have captured the first real-time nanoscale images of lithium dendrite structures known to degrade lithium-ion batteries. A paper describing their study, which probed the mechanisms of solid electrolyte interphase (SEI) formation and dendrite growth in a standard organic battery electrolyte (LiPF6 in EC:DMC), is published in the ACS journal Nano Letters.
They combined quantitative electrochemical measurement and STEM (scanning transmission electron microscopy), or in situ ec-S/TEM, to estimate the density of the evolving SEI and to identify Li-containing phases formed in the liquid cell. They reported that the SEI is approximately twice as dense as the electrolyte as determined from imaging and electron scattering theory. They also observed site-specific locations where Li nucleates and grows on the surface and edge of the glassy carbon electrode. The ORNL team’s electron microscopy could help researchers address long-standing issues related to battery performance and safety.
LLNL-led team gains insight into electronic structure changes in supercapacitor electrodes; research could lead to more efficient electrical energy storage
March 05, 2015
Lawrence Livermore National Laboratory (LLNL) researchers and their colleagues from Lawrence Berkeley Laboratory and the Nanosystem Research Institute in Japan have identified electrical charge-induced changes in the structure and bonding of graphitic carbon electrodes that may one day affect the way energy is stored. The research could lead to an improvement in the capacity and efficiency of electrical energy storage systems, such as batteries and supercapacitors, needed to meet the burgeoning demands of consumer, industrial and green technologies.
The LLNL-led team developed a new X-ray adsorption spectroscopy capability that is tightly coupled with a modeling effort to provide key information about how the structure and bonding of graphitic carbon supercapacitor electrodes are affected by polarization of the electrode – electrolyte interfaces during charging. A paper describing their work is published in the journal Advanced Materials.
Silica-coated sulfur nanoparticles with mildly reduced graphene oxide as Li-S battery cathode
March 04, 2015
One of the main obstacles to the commercialization of high-energy density lithium-sulfur batteries is the tendency for lithium polysulfides—the lithium and sulfur reaction products—to dissolve in the battery’s electrolyte and travel to the opposite electrode permanently. This causes the battery’s capacity to decrease over its lifetime.
To prevent this polysulfide shuttle, researchers in the Bourns College of Engineering at the University of California, Riverside have fabricated SiO2-coated sulfur particles (SCSPs) for cathode material. With the addition of mildly reduced graphene oxide (mrGO) to the material, SCSPs maintain more than 700 mAh g−1 after the 50th cycle. A paper on their work is published in the RSC journal Nanoscale.
Lux Research: the $40,000, 200-mile-range EV is the biggest coming growth opportunity for energy storage in transportation
March 02, 2015
Analysis by Lux Research suggests that the market space represented by the emerging lower-cost, 200-mile-range EV will be the biggest coming growth opportunity in electric storage for transportation. By 2020, this new EV battleground should account for $5 billion or more in Li-ion battery sales, because it combines larger packs (around 50 kWh) with more sales (hundreds of thousands of vehicles).
According to Lux Research’s Automotive Battery Tracker, in 2014 EVs used $2.1-billion worth of energy storage. While selling in similar volumes, plug-in hybrids (PHEVs) used three times less batteries: about $0.7 billion worth. Despite selling about 1.5 million units in 2014, an order of magnitude more than the 140,000 EVs that consumers bought in 2014, HEVs also used just $0.7-billion worth of energy storage in 2014.
Audi to offer new R8 e-tron EV on request; almost 2x pack capacity, 280-mile range with new Li-ion technology (update 1)
February 26, 2015
Audi is presenting the second generation of its high-performance R8 sports car at the upcoming Geneva show, featuring new V10 engines, newly developed quattro drive, and a new multimaterial Audi Space Frame (ASF) combining aluminum and carbon fiber reinforced plastics (CFRP). The top of the range version delivers 449 kW (610 hp), achieving 0 to 100 km/h (62.1 mph) in 3.2 seconds, with a top speed of 330 km/h (205.1 mph).
The second generation of the Audi R8 also forms the basis for two more models, including a high-performance battery-electric version, the R8 e-tron 2.0. This latest evolution of the vehicle takes up the multimaterial Audi Space Frame from the new series-production model. The new R8 e-tron, which will be available for order in 2015 upon customer request, uses a newly developed high energy density lithium-ion technology which was specially conceived for a purely electric vehicle drive. In comparison to the first technology platform (earlier post), the battery capacity has grown from 49 kWh to approximately 92 kWh—without changing the package.
New PNNL zinc-polyiodide redox flow battery offers 2x energy density of next-best system; potential for mobile applications
Researchers at Pacific Northwest National Laboratory (PNNL) have developed a new zinc-polyiodide redox flow battery offering more than two times the energy density of the next-best flow battery used to store renewable energy and support the power grid.
Lab tests revealed the demonstration battery discharged 167 Wh l-1 of electrolyte. In comparison, zinc-bromide flow batteries generate about 70 Wh l-1, vanadium flow batteries can create between 15 and 25 Wh l-1, and standard lithium iron phosphate batteries could put out about 233 Wh l-1. The team calculated that their new battery theoretically could discharge even more—up to 322 Wh l-1—if more chemicals were dissolved in the electrolyte. An open access paper on the work appears in Nature Communications.
New PNNL electrolyte may enable use of lithium anodes in very high capacity advanced batteries
February 24, 2015
Researchers at Pacific Northwest National Laboratory (PNNL) have developed a new electrolyte that allows lithium-sulfur, lithium-metal and lithium-air batteries to operate at 99% efficiency, while having a high current density and without growing dendrites that short-circuit rechargeable batteries. An open-access paper on their work is published in the journal Nature Communications.
“This new discovery could kick-start the development of powerful and practical next-generation rechargeable batteries such as lithium-sulfur, lithium-air and lithium-metal batteries,” said PNNL physicist Ji-Guang Zhang, corresponding author of the paper.
BASF and Toda Kogyo close agreement for JV specializing in cathode materials for Li-ion batteries
BASF and Toda Kogyo formally established “BASF Toda Battery Materials LLC” with the closing of their joint venture agreement announced in October 2014. (Earlier post.) The new company will provide cathode active materials (CAM) for lithium-ion batteries in Japan.
BASF Toda Battery Materials was established with 66% equity from BASF Japan Ltd. and 34% from Toda Kogyo CORP. The joint venture will conduct research and development, production, marketing and sales for a broad range of cathode materials, particularly NCA (Nickel Cobalt Aluminum Oxide), LMO (Lithium Manganese Oxide) and NCM (Nickel Cobalt Manganese) in Japan.
Polypore sells itself; battery separators to Asahi Kasei for $2.2B, separations media to 3M for $1B
February 23, 2015
|Asahi Kasei projects significant growth in demand for Li-ion battery separators in the automotive segment. Source: Asahi Kasei. growth in Click to enlarge.|
Polypore International, Inc., a manufacturer of microporous membranes, signed definitive agreements for its sale. 3M will acquire the assets of Polypore’s Separations Media segment for approximately $1.0 billion; as an integrated step in the transaction, Asahi Kasei Corporation, through a US subsidiary, will then purchase what remains of Polypore for $60.50 per share in cash. Asahi Kasei will receive the cash proceeds from the sales of the Separations assets to 3M.
Polypore’s energy storage business comprises two main elements: Celgard Li-ion battery separators and Daramic lead-acid battery separators. Asahi Kasei said that Polypore is a compelling fit with its own electronic materials business, led by its Hipore lithium-ion battery separator with applications in energy storage for both consumer electronics and automotive applications.
3M invests in Nanoscale Components to leverage its pre-lithiation process for 3M silicon anodes
February 19, 2015
3M has made an investment in Nanoscale Components, a company that has developed a novel, low-cost pre-lithiation process. 3M says its investment will expand the adoption of 3M’s unique silicon alloy anode for lithium-ion batteries. (Earlier post.)
To take advantage of promising high-capacity anode materials such as silicon, sulfur and other lithium-free materials in a next-generation Li-ion battery, either the cathode or the anode needs to be prelithiated—i.e., lithium needs to be inserted into the material. In a 2011 paper in the journal ACS Nano (earlier post) Stanford researchers led by Prof. Yi Cui noted that:
Carbon-coated nano-silicon paper electrodes outperform graphite anodes by more than 2 times
|Cycling data for C-coated SiNFs compared to uncoated SiNFs at C/10 (1C = 4 A g−1). Favors et al. Click to enlarge.|
Researchers at the University of California, Riverside’s Bourns College of Engineering have developed a novel nano-silicon paper electrode material for high capacity lithium-ion batteries. A paper describing the work is published in the Nature journal Scientific Reports.
The free-standing (i.e., binderless) carbon-coated Si nanofiber (C-SiNF) electrodes produce a capacity of 802 mAh g−1 after 659 cycles with a Coulombic efficiency of 99.9%, which outperforms conventionally used slurry-prepared graphite anodes by more than two times on an active material basis. The silicon nanofiber paper anodes offer a completely binder-free and Cu current collector-free approach to electrode fabrication with a silicon weight percent in excess of 80%.
CMU team finds regional temperature differences have significant impact on EV efficiency, range and emissions
February 18, 2015
|Energy consumption per mile averaged across the LEAF fleet over a full year (Wh/mi). Credit: ACS, Yuksel and Michalek. Click to enlarge.|
An adage about batteries is that they are like humans in performing best at moderate (e.g., room) temperatures; extremes in either direction impact performance. Thus, the efficiency of battery electric vehicles can vary with ambient temperature due to battery performance—as well as the energy required for cabin climate control.
In a new paper accepted for publication in the ACS journal Environmental Science & Technology, Tugce Yuksel and Jeremy Michalek at Carnegie Mellon University have now characterized the effect of regional temperature differences on EV efficiency, range, and use-phase CO2 emissions in the US, based on aggregated real-world fleet data for the Nissan LEAF. Among their findings is that the resulting regional differences in efficiency, range and emissions are large enough to affect adoption patterns and the energy and environmental implications of battery EVs relative to alternatives.
Battery charging company CTEK licenses WiTricity technology for wireless vehicle battery charging
Leading automotive battery charger manufacturer CTEK Corporation has entered a technology and patent license agreement with wireless power transfer technology company WiTricity, enabling CTEK to commercialize WiTricity’s patented technology to create high performance, efficient wireless charging systems for a wide range of battery charging and battery conditioning applications in various automotive and powersports applications.
By providing a flexible and efficient method of wireless power transfer, CTEK will begin to develop a line of products that will bring a new level of convenience and ease to battery charging. Future applications should make it possible for drivers to simply park over a contact patch in their garage or parking spot, leaving the battery to charge in their absence. Owners who have vehicles for occasional use, such as classic cars or powersports machines that only come out at the weekend, could also take advantage of such a device.
Nemaska Lithium secures $12.87M grant from SDTC for Phase 1 lithium hydroxide plant
Nemaska Lithium Inc. has secured a $12.87-million technology commercialization grant for its Phase 1 lithium hydroxide hydromet plant from the federally-funded Sustainable Development Technology Canada (SDTC). The Phase 1 plant, designed to produce 500 tonnes per year of high purity lithium hydroxide, is designed be a module of a larger commercial hydromet plant.
Nemaska intends to use this facility to demonstrate its proprietary lithium hydroxide technology and produce commercial samples to send to end users primarily in the lithium battery market with a goal of securing off-take agreements in advance of starting operation of its lithium mine and commercial hydromet facility.
A*STAR researchers suggest monolayer phosphorene promising anode material for high-performance Li-ion batteries
February 13, 2015
Researchers at A*STAR in Singapore are proposing the use of monolayer phosphorene—a 2D material isolated from black phosphorus—as an anode material for high charging voltage, high rate capability Li-ion batteries. In a paper published in the ACS journal Nano Letters, they described their use of density functional theory calculations to investigate the binding and diffusion behavior of Lithium in phosphorene.
Phosphorus is a low-cost abundant material with a high theoretical specific capacity of 2596 mAh·g-1 upon lithiation with most of its capacity at the discharge potential range of 0.4–1.2 V, suitable as anodes. (Earlier post.) However, in a 2014 study led by Prof. Yi Cui, researchers at Stanford noted that successful applications of phosphorus anodes have been impeded by rapid capacity fading, mainly caused by large volume change (around 300%) upon lithiation and thus loss of electrical contact. In that 2014 study, the Stanford researchers fabricated composites of black phosphorus nanoparticle-graphite; the resulting material exhibited high initial discharge capacity of 2786 mAh·g-1 at 0.2 C and cycle life of 100 cycles with 80% capacity retention.
Researchers identify peptide to bind LMNO to improve power and performance of cathodes in Li-ion batteries
February 12, 2015
Researchers at the University of Maryland, Baltimore County (UMBC) have isolated a peptide, a type of biological molecule, which binds strongly to lithium manganese nickel oxide (LMNO), a material that can be used to make the cathode in high-performance Li-ion batteries. The peptide can latch onto nanosized particles of LMNO and connect them to conductive components of a battery electrode, improving the potential power and stability of the electrode.
The researchers presented their results at the 59th annual meeting of the Biophysical Society, held 7-11 Feb.in Baltimore, Maryland.
Bosch, BMW and Vattenfall launch Second Life Batteries alliance for reuse of EV batteries
February 11, 2015
Bosch is cooperating with BMW and Vattenfall to explore second-life applications for EV batteries. The partners have launched the Second Life Batteries alliance and are interconnecting used batteries from electric vehicles to form a large-scale energy storage system in Hamburg. BMW and Vattenfall has announced the start of a research project on such second-life uses in 2013. (Earlier post.)
The current plans call for the construction of a storage unit with an output of two megawatts (MW) and an installed capacity of two megawatt hours (MWh) in Hamburg. The energy will be fed into the energy balancing market to balance out short-term fluctuations in the power grid. More than 100 vehicle batteries will be interconnected to achieve these targets.
ALABC showcased three 48V hybrid demonstrators at AABC featuring advanced lead-carbon batteries
February 10, 2015
The Advanced Lead Acid Battery Consortium (ALABC) last month showcased three hybrid electric concept vehicles resulting from its R&D program that demonstrate the real-world potential of lead-carbon batteries in 48V architectures. The cars, two of which were produced in association with major OEMs (Ford and Hyundai/Kia), exhibit substantial environmental and fuel-efficient benefits through low-cost hybridization. The vehicles were part of the ALABC display at the Advanced Automotive Battery Conference (AABC Europe 2015) held at the Rheingoldhalle in Mainz, Germany.
All three vehicles feature advanced lead-carbon batteries, also known as carbon-enhanced lead-acid batteries. The batteries, Exide’s spiral-wound Orbital AGM and East Penn Manufacturing’s UltraBattery (the latest model of which was also on display at the ALABC stand), are some of the most effective lead-carbon designs for 48V hybrid electrification, ALABC said.
Researchers use DNA to stabilize sulfur cathode for high-performance Li-sulfur batteries
|DNA has a high concentration of heteroatoms, including oxygen, nitrogen and phosphorus, that can anchor soluble polysulfides to improve the cycling performance of Li/S batteries. Li et al. Click to enlarge.|
A team from the China University of Geosciences has taken a novel approach to stabilizing Lithium-sulfur batteries by functionalizing the carbon-sulfur cathode with DNA.
Experimental results reported in a paper accepted for publication in the RSC Journal of Materials Chemistry A showed that adding a fine adding amount of DNA into a carbon/sulfur composite enables a significant improvement to cyclic performance by anchoring the soluble polysulfides that lead to performance degradation. The DNA-decorated electrode offered a discharge capacity of 771 mAh·g-1 at 0.1 C after 200 cycles (retention 70.7% of the initial)—a three-fold enhancement in capacity retention over 200 cycles.
Startup Blue Current seeking to commercialize non-flammable fluorinated electrolytes for Li-ion batteries
Lawrence Berkeley National Laboratory (Berkeley Lab) battery scientist Nitash Balsara and co-inventor Joseph DeSimone of the University of North Carolina at Chapel Hill, have launched Blue Current, a startup company backed by investment firm Faster LLC, to commercialize their non-flammable electrolytes for Li-ion batteries.
Conventional alkyl carbonate electrolytes used in lithium-ion batteries are flammable, and incidents of fires have been reported, usually due to thermal runaway. Blue Current’s fluorinated non-flammable electrolytes are functionalized perfluoropolyethers (PFPEs). In addition to their non-flammability, these electrolytes also exhibit high transference numbers and low electrochemical polarization, indicative of longer battery life.
High-performance slurryless Li2S cathode paper for Li-Sulfur batteries
February 09, 2015
Researchers from China and the US have developed a flexible slurryless nano-Li2S/reduced graphene oxide cathode paper (nano-Li2S/rGO paper) which can be directly used as a free-standing and binder-free cathode without metal substrate, which leads to significant weight savings in batteries. The cathode paper is intended to be paired with safer anode materials such as silicon, aluminum, tin, graphene, transition metal oxides, and so forth, rather than Li-metal anodes. (Earlier post.)
The flexible and conductive paper electrode shows excellent cycling life and rate capability with a reversible discharge capacity of 816.1 mAh g−1 after 150 cycles at 0.1 C, and 597 mAh g−1 even at 7 C. After cycling 200 times at 5 C, the capacity can still remain at 462.2 mAh g−1. A paper on the team’s work is published in the ACS journal Nano Letters.
Battelle/Concurrent Technologies Corporation technology positioning paper: Improving Li-ion battery safety without decreasing energy density
February 05, 2015
Ed. introduction: The following technology positioning paper is a joint effort by a team from Battelle and Concurrent Technologies Corporation (CTC). The paper outlines the technology landscape and the opportunities that exist in the area of improved Li-ion battery safety.
Energy is a common technology area on which both research organizations focus in different ways, noted Dr. Vicki Barbur, CTC Senior Vice President and CTO. The two have decided that Li-ion battery safety is an area of opportunity for each. Supported by an ARPA-E award, Battelle recently developed an optical sensor to monitor the internal environment of a lithium-ion battery in real-time. (Earlier post.) The organizations intend to pursue further efforts directed toward safety in relation to Li-ion battery technology. Interest and involvement from external clients would be welcomed.
Bosch CEO: 15% of new cars by 2025 to be at least a hybrid; batteries to deliver 2x energy density for 1/2 current cost by 2020
February 04, 2015
Speaking at the 15th CAR Symposium in Bochum, Germany, Dr. Volkmar Denner, chairman of the board of management of Robert Bosch GmbH, said that that Bosch expects roughly 15% of all new cars built worldwide to have at least a hybrid powertrain by 2025. Denner, whose responsibilities on the board of management include research and advanced development, believes that by 2020 batteries will deliver twice as much energy density for half the present cost.
The EU has set strict fleet CO2 targets for 2021. For this reason alone, Bosch expects hybrid powertrains to become the standard for SUVs. This will give diesel and gasoline engines an extra boost.
High energy capacity Li-ion cathodes from 3D V6O13 nanotextiles
February 02, 2015
|Energy density comparison of the 3D nanotextile electrode and conventional LiMn2O4, LiCoO2, LiFePO4, and LiNi0.5Mn1.5O4 electrodes. Credit: ACS, Fing et al. Click to enlarge.|
A team from University of Science and Technology of China and Max Planck Institute in Germany has synthesized 3D V6O13 nanotextiles from interconnected 1D nanogrooves with diameter of 20–50 nm.
Used as cathode materials in Li-ion batteries, the 3D nanotextiles delivered reversible capacities of 326 mAh g–1 at 20 mA g–1 and 134 mAh g–1 at 500 mA g–1, and a capacity retention of above 80% after 100 cycles at 500 mA g–1. The textiles showed a specific energy as high as 780 Wh kg–1, 44–56% higher than those of conventional cathodes such as LiMn2O4, LiCoO2, and LiFePO4. Furthermore, the 3D architectures retain good structural integrity upon cycling, the researchers reported in their paper in the ACS journal Nano Letters.
Ioxus launches new ultracap module series for easier design and installation; under the hood for automotive
Ultracapacitor maker Ioxus has launched its iMOD X-Series, a family of 22 modules that makes the design and installation at the system level extremely easy for the end-customer. The architecture of the iMOD X-Series will be the framework for future Ioxus energy storage technologies across its ultracapacitor systems.
The X-Series was initially introduced in April 2014 during a soft launch of the product’s Alpha design. (Earlier post.) The production launch of the iMOD X-Series simplifies system design and installation for the end-user by offering customers a wide array of possible mounting configurations. This level of flexibility is made possible by the design of the iMOD X-Series’ core technology. Built modularly to maximize quality and value, the core includes integrated wire management systems to ensure proper wire location, integrated heat sinks, and unmatched 5,000 VAC hi-pot.
SolidEnergy targeting rechargeable Li-metal smartphone battery in 2016, EV battery with 2x range in 2017
January 31, 2015
SolidEnergy, an MIT spin-out commercializing solid electrolyte technology enabling the use of lithium metal anodes for high energy density rechargeable batteries (earlier post), says that in 2016, it and its battery manufacturing partners will release a 2 Ah commercial battery for the smartphone and wearable market. This is to be followed in 2017 by a 20 Ah electric vehicle battery offering more than two times the driving range of current Li-ion batteries.
In 2014, the company announced a prototype 2Ah pouch cell with a volumetric energy density of more than 1200 Wh/L; subsequently the company said it had achieved 1337 Wh/L in a 2Ah pouch cell. Its Solid Polymer Ionic Liquid (SPIL) electrolyte enables the use of an ultra-thin lithium metal anode, and improves the cell-level energy density by 50% compared to graphite anodes and 30% compared to silicon-composite anodes.
EaglePicher Licenses OneD Material’s SiNANOde silicon-nanowire anode technology
January 30, 2015
EaglePicher Technologies, LLC has entered into a License Agreement and an Engineering Services Agreement with OneD Material to set up a new EaglePicher production facility in Joplin to produce SiNANOde, a silicon-nanowire-based anode material originally developed by Nanosys (earlier post) for building high energy density lithium-ion cells and batteries. (In 2013, OneD Material acquired Nanosys’ nanowire technologies and related assets including its R&D activities.)
This new technology will be used in part with EaglePicher’s initiative to increase lithium-ion cell production and expand the product portfolio for defense and aerospace applications. (Earlier post.) The addition of SiNANOde raw material is a key component for improving the performance of lithium-ion cells and batteries for niche applications.