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Safe and efficient energy storage is important for American prosperity and security. With the adoption of both renewable energy sources and electric vehicles on the rise around the world, it is no surprise that research into a new generation of batteries is a major focus. Researchers have been developing batteries with higher energy storage density and, thus, longer driving range. Other goals include shorter charging times, greater tolerance to low temperatures and safer operation.

One of the more promising such batteries has a lithium-containing cathode supplemented with nickel, manganese and cobalt (NMC). At the U.S. Department of Energy’s (DOE) Argonne National Laboratory, a team of scientists has recently developed a new coating method for NMC cathodes with high nickel content, which boosts the energy density substantially. The cathode is the positively charged battery component that supplies lithium ions that shuffle between it and the battery’s negatively charged electrode, called the anode, during cycling.

The repeated charging of batteries under conditions of high voltage and rapid recharge leads to structural instability and breakdown over time. To overcome the problem, Argonne scientists developed a new coating that allows the cathode particles to withstand the fracturing in their crystalline structure that had previously occurred upon cycling. They call this material ​“epitaxial entropy-assisted coating,” or EEC for short. According to Xu, ​“entropy assistance” ensures that the coating helps to prevent the breakdown of the material beneath it due to a thermodynamic effect, which leads materials to naturally become destabilized over time.

Read more at: https://www.anl.gov/article/scientists-find-new-way-to-enhance-durability-of-lithium-batteries