Enhanced battery capacity and cycle life due to suppressed side reactions on the surface of Ni-rich LiNiCoMnO cathode materials coated with Co(PO).

This study explores a strategy to mitigate capacity fading in secondary batteries, which is primarily attributed to side reactions caused by residual Li impurities (LiOH or LiCO) on the surface of Ni-rich LiNiCoMnO (NCM811) layered cathode materials. By applying a 1.5 wt% Co(PO) coating, we successfully formed a thin and stable LiF cathode-electrolyte interface (CEI) layer, which resulted in decreased battery resistance and enhanced diffusion of Li ions within the electrolyte.