Improving the electrochemical performance of Li1.2Ni0.13Co0.13Mn0.54O2 by Li-ion conductor

Abstract

Electrochemical performances of Li-rich layered cathode material Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ (LNCMO) are improved by modification of lithium-ion conducting Li_1.3Al_0.3Ti_1.7(PO₄)₃ (LATP). The sintering temperature and the amount of LATP are optimized to improve the electrochemical performance of LNCMO. With 2 wt% LATP modification treatment at 550 °C, the LNCMO exhibits remarkably enhanced cyclic and rate performances and more stable voltage plateaus. A capacity of 209 mA h g⁻¹ at 0.2C and 86.3% capacity retention over 100 cycles are attained. Impedance analysis shows lower charge transfer impedance for the modified LNCMO. The LATP modification layer can promote Li-ion mobility and protect the active materials from side reactions at the cathode/electrolyte interface, and hence greatly improve the electrochemical performance.