Lithium-conductive LiNbO3 coated high-voltage LiNi0.5Co0.2Mn0.3O2 cathode with enhanced rate and cyclability

LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) cathode materials can operate at extremely high voltages and have exceptional energy density. However, their use is limited by inherent structure instability during charge/discharge exceptionally oxidizing Ni 4+ the surface. Herein, we developed a citrate-assisted deposition concept to achieve uniform lithium-conductive LiNbO 3 coating layer on NCM523 surface that avoids self-nucleation of Nb-contained compounds in solution reaction. The electrode–electrolyte interface therefore stabilized physically blocking detrimental parasitic reactions dissolution whilst still maintaining Li + conductivity. Consequently, modified exhibits an encouraging Li-storage specific capacity 207.4 mAh g ?1 C 128.9 10 over range 3.0–4.5 V. Additionally, 92% retention was obtained after 100 cycles 1 C, much higher than pristine (73%). This engineering strategy be extended modify other Ni-rich with durable electrochemical performances. We develop Therefore, 10C been improved from 45% 63% relative 0.2C.