 Single-crystal Ni-rich cathode suffer from side reactions with the electrolyte and slow Li-ion transport during high-voltage cycling. Herein, a Li-1.4 Y0.4 T1.6 P04 3-coating is applied to facilitate the Li-ion transport and improve the cycling life of the cell. This article was authored by Xinming Fan, Xing OU, Wang Yao Zhao, and others.