Effect of NaTi2(PO4)3 Coating on Improving Capacity Retention of Li-rich Li1.13Ni0.2Co0.2Mn0.47O2 Cathode

摘要

Li-rich NCM is a new promising type of cathode material for lithium-ion battery (LIB) applications. It has been reported that Li-rich NCM delivers superior specific capacity (>218 mAh/g). Despite its outstanding performance, some works have reported instability of the material upon cycling. Coating the cathode materials with a chemically stable material is considered as the best strategy to improve the stability of Li-rich NCM. In this work, Li_1.13Ni_0.2Co_0.2Mn_0.47, a type of Li-rich NCM cathode, was successfully synthesized via a simplified solid-state method. The resulted product was then coated with NaTi₂(PO₄)₃ (NTP), a promising phosphate compound with excellent chemical stability and superior ionic conductivity. It was found that NTP-coated Li- rich NCM delivered better electrochemical properties compared to the pristine one, as was determined by charge-discharge battery characterization.