Electrochemical performance of Li‐rich cathode material, 0.3Li ₂ MnO ₃ –0.7LiMn _1/3 Ni _1/3 Co _1/3 O ₂ microspheres with F‐doping

Abstract

Abstract Layered F‐doped cathode materials 0.3Li 2 MnO 3 –0.7LiMn 1/3 Ni 1/3 Co 1/3 O 2− x F x ( x = 0, 0.01, 0.02, 0.03, 0.04, 0.05) microspheres made up of nanosized primary grains were prepared through co‐precipitation method. The sample of x = 0.02 demonstrates a large discharge capacity of 226 mAh·g −1 over 100 cycles at 0.1C and excellent rate performance with discharge capacity of 96 mAh·g −1 at 5.0C and room temperature. Particularly, this material shows much enhanced electrochemical performances even at high temperature of 55 °C. It delivers a quite high discharge capacity of 233.7 mAh·g −1 at 1.0C with capacity retention as high as 97.9% after 100 cycles. The results demonstrate that the fluorine incorporation stabilizes the cathode structure and maintains stable interfacial resistances.