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U Texas team develops cobalt-free high-energy lithium-ion battery

Researchers from the Cockrell School of Engineering at The University of Texas at Austin have developed a cobalt-free high-energy lithium-ion battery, eliminating the cobalt and opening the door to reducing the costs of producing batteries while boosting performance in some ways. The team reported a new class of cathodes anchored by high nickel content. The cathode in their study is 89% nickel. Manganese and aluminum make up the other key elements.

More nickel in a battery means it can store more energy. That increased energy density can lead to longer battery life for a phone or greater range for an electric vehicle with each charge.

The findings appeared in the journal Advanced Materials. The paper was written by Arumugam Manthiram, a professor in the Walker Department of Mechanical Engineering and director of the Texas Materials Institute, Ph.D. student Steven Lee and Ph.D. graduate Wangda Li.

High‐nickel LiNi1−x−yMnxCoyO2 (NMC) and LiNi1−x−yCoxAlyO2 (NCA) are the cathode materials of choice for next‐generation high‐energy lithium‐ion batteries. Both NMC and NCA contain cobalt, an expensive and scarce metal generally believed to be essential for their electrochemical performance. Herein, a high‐Ni LiNi1−x−yMnxAlyO2 (NMA) cathode of desirable electrochemical properties is demonstrated benchmarked against NMC, NCA, and Al–Mg‐codoped NMC (NMCAM) of identical Ni content (89 mol%) synthesized in‐house.

Despite a slightly lower specific capacity, high‐Ni NMA operates at a higher voltage by ≈40 mV and shows no compromise in rate capability relative to NMC and NCA. In pouch cells paired with graphite, high‐Ni NMA outperforms both NMC and NCA and only slightly trails NMCAM and a commercial cathode after 1000 deep cycles. Further, the superior thermal stability of NMA to NMC, NCA, and NMCAM is shown using differential scanning calorimetry. Considering the flexibility in compositional tuning and immediate synthesis scalability of high‐Ni NMA very similar to NCA and NMC, this study opens a new space for cathode material development for next‐generation high‐energy, cobalt‐free Li‐ion batteries.

—Li et al.

Typically, increased energy density leads to trade-offs, such as a shorter cycle life. Eliminating cobalt usually slows down the kinetic response of a battery and leads to lower rate capability. However, the researchers said they’ve overcome the short cycle life and poor rate capability problems through finding an optimal combination of metals and ensuring an even distribution of their ions.

Most cathodes for lithium-ion batteries use combinations of metal ions, such as nickel-manganese-cobalt (NMC) or nickel-cobalt-aluminum (NCA). Cathodes can make up roughly half of the materials costs for the entire battery, with cobalt being the priciest element. At a price of approximately $28,500 per ton, it is more expensive than nickel, manganese and aluminum combined, and it makes up 10% to 30% of most lithium-ion battery cathodes.

Cobalt is the least abundant and most expensive component in battery cathodes. And we are completely eliminating it.

—Arumugam Manthiram

The key to the researchers’ breakthrough can be found at the atomic level. During synthesis, they were able to ensure the ions of the various metals remained evenly distributed across the crystal structure in the cathode. When these ions bunch up, performance degrades, and that problem has plagued previous cobalt-free, high-energy batteries, Manthiram said. By keeping the ions evenly distributed, the researchers were able to avoid performance loss.

Our goal is to use only abundant and affordable metals to replace cobalt while maintaining the performance and safety, and to leverage industrial synthesis processes that are immediately scalable.

—Wangda Li

Manthiram, Li and former postdoctoral researcher Evan Erickson worked with UT’s Office of Technology Commercialization to form a startup called TexPower to bring the technology to market. The researchers have received grants from the US Department of Energy, which has sought to decrease dependency on imports for key battery materials.

Industry has jumped on the cobalt-free push—most notably an effort from Tesla to eliminate the material from the batteries that power its electric vehicles. The researchers said they have avoided problems that hindered other attempts at cobalt-free, high-energy batteries with innovations on the right combination of materials and the precise control of their distribution.

Resources

  • Li, W., Lee, S., Manthiram, A. (2020) “High‐Nickel NMA: A Cobalt‐Free Alternative to NMC and NCA Cathodes for Lithium‐Ion Batteries.” Adv. Mater. doi: 10.1002/adma.202002718

Comments

mahonj

Lets hope it works, but I wouldn't bet my retirement savings on it.

Lad

With so many researchers now working on battery tech, I think a low cost, long range, high power battery is within reach.
It's too bad the early car builders of the 1900s were so quick to abandon electric motors in favor of internal explosive engines. Had they continued the development of EVs, the World might have been a different place; perhaps even a better place where wars over oil economics never happened.

SJC_1

Tesla has a patent on pre lithiation to increase capacity.

mahonj

@Lad, interesting notion, there is a steampunk novel to be had in a world where they discovered a better battery, but I think there's still have ICE engines - for aircraft and they were already using oil in ships.
Also, the military would probably have preferred oil for trucks and tanks - it would have been hard to build enough charging stations for an army on the move.
probably OK for defensive battles (like most of 1914-early 1918).

gryf

Just a few points about this Cobalt-Free cathode.
1. Arumugam Manthiram, one of the pioneers of Lithium Ion batteries, knows cathodes.
2. The next step in Lithium Ion batteries is Cobalt-Free. Tesla is probably going to announce something like this in September. Jeff Dahn (who works closely with Tesla) has done extensive research in zero and low Cobalt batteries.
3. SVolt has already announced NMx Cobalt-Free batteries for their Great Wall Chinese automobiles that will be produced next year.
4. In the future, the amount of Nickel (89% in this study) needs to be reduced, e.g. more Manganese which has a lower cost.

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