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New Lithium-intercalated graphene materials good candidates for Li-ion battery applications

Variation in discharge capacity vs. cycle number for graphite, RGO, and Li-RGO cycled at a current rate of 25 mA/g between 3.0 and 0.02 V vs Li/Li+ in a 1 M solution of LiPF6 in a 1:1 (v/v) mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC) as the electrolyte. Credit: ACS, Kumar et al. Click to enlarge.

Researchers at Rice University, with colleagues from the US Army Research Laboratory and Lockheed Martin Maritime Systems & Sensors report on the development of a novel approach for bulk synthesis of lithium-intercalated graphene sheets through the reduction of exfoliated graphene oxide in liquid ammonia and lithium metal.

The as-synthesized lithiated graphite oxide sheets (Li-RGO) can be directly used as an electrode material in lithium batteries; electrochemical studies on Li-RGO electrodes show a significant enhancement in the specific capacity of the lithium battery over commercially available graphite electrodes. Their paper appears in the journal ACS Nano.

To test its applicability in lithium-ion batteries, the researchers prepared a working electrode by mixing 85% Li-RGO with 10% carbon black and 5% binder (polytetrafluoroethylene), then carried out electrochemical measurements by taking a 1 M solution of LiPF6 in a 1:1 (v/v) mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC) as the electrolyte and Li foil as counter and reference electrode.

Cyclic voltammograms (CV) of the Li-RGO electrode demonstrated that lithium could reversibly intercalate and deintercalate into graphene sheets.

Li-RGO showed reversible discharge capacities of 410 mAh/g, compared to 300 mAh/g for graphite and 340 mAh/g for RGO.

The enhancement in the capacity of Li-RGO as compared to graphite and RGO can be attributed to the presence of electrochemically active defects (i.e., edge and basal-plane defects) formed during the reduction of graphite oxide and also due to the absorption of Li on the internal surfaces of the disordered graphene sheets.

The interface between liquid electrolyte and the outer surface of each graphene sheet involves SEI formation and results in huge irreversible capacity loss in the first discharge, whereas defects present in the Li-RGO usually undergo a reversible Li intercalation/deintercalation process without involving SEI formation and result in enhanced capacity compared to graphite and RGO.

—Kumar et al.

The team concludes that the partial intercalation of lithium ions in between graphene layers makes this material a good candidate for electrochemical energy storage applications.


  • Ashavani Kumar, Arava Leela Mohana Reddy, Arnab Mukherjee, Madan Dubey, Xiaobo Zhan, Neelam Singh, Lijie Ci, W. Edward Billups, John Nagurny, Gandhi Mital, Pulickel M. Ajayan (2011) Direct Synthesis of Lithium-Intercalated Graphene for Electrochemical Energy Storage Application. ACS Nano doi: 10.1021/nn201527p



Isn't this a downgraded graphene electrode application?


Why didn't my comment get posted??


Yesterday I posted a comment stating that this improvement was minimal compared to the almost 3 times better MoS2/graphene from Zhejiang University (China) posted here May 21. Maybe it was rejected because I included a link to the previous article.
Zhejiang U 100mA/g power, 1100mAh/g energy.
Rice U 25mA/g power, 435mAh/g energy.


SEI? RGO? This site needs a glossary, badly.


Once they can make graphene cheap and abundant they might have something. Right now it is a lab curiosity that is producing some interesting results.


Like many other new technologies in mass production.


"While refinement of Litium Ion battery technology may prove sufficient for mass commercialization for plug in hybrids, a new type of energy storage will likely be required so that BEVs can satisfy the cost and range preferences of mainstream consumers."

Indiana University Report, " Plug In Electric Vehicles: A Practical Plan for Progress."


@ HarveyD

"Like many other new technologies in mass production."

If a technology is in mass production it isn't new and if it's new it isn't in mass production.

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