Boosting the Electrochemical Performance of LiNiCoMnO by Rough Coating with the Superionic Conductor LiLaZrO.

Li-rich Mn-based layered compounds have progressed as promising cathode materials for lithium-ion batteries (LIBs) due to their relatively low cost, considerable energy storage capacity, and high operating voltage. However, they suffer critical drawbacks, such as capacity decay and inferior rate performance, which restrain their real applications. We carried out surface modification via rough coating of superionic conductor LiLaZrO (LLZO) on the Li-rich Mn-based layered cathode. The cathode with a LLZO coating exhibits significantly improved electrochemical performance, which mainly benefits from the enhanced Li-ion diffusion and reduced side reactions at electrode/electrolyte interfaces via effective coating of LLZO layer. This work provides a facile and efficient way to design Li-rich Mn-based cathodes for high-energy and stable LIBs.