Li₃V₂(PO₄)₃-coated Li_1.17Ni_0.2Co_0.05Mn_0.58O₂ as the cathode materials with high rate capability for Lithium ion batteries

In this work, Lithium rich layered oxide Li_1.17Ni_0.2Co_0.05Mn_0.58O₂ (LNCMO) is prepared and coated with Li₃V₂(PO₄)₃ (LVP) by a chemical deposition method. The surface modification with LVP is introduced into Li-rich layered oxides LNCMO for the first time. After 100 cycles of charging and discharging at various rates, the Li₃V₂(PO₄)₃-coated Li_1.17Ni_0.2Co_0.05Mn_0.58O₂ (LVP-coated LNCMO) (5 wt%) still provides a large capacity of 261.4 mAh g^-1, much higher than the pristine LNCMO (211.5 mAh g^-1). At 5 C rate, the LVP-coated LNCMO exhibits a stable cyclic capacity of 153.4 mAh g^-1, higher than 114.1 mAh g^-1 of the pristine LNCMO. The electrochemical impedance spectroscopy (EIS) analysis demonstrates the LVP coating layer can suppress interaction between the cathode surface and the electrolyte and enhance the kinetics of lithium-ion diffusion, contributing to the stable cyclic performance with more cyclic capacity as well as at the high current density