Electrochemical performance of Li-rich cathode material, 0.3Li₂MnO₃–0.7LiMn_1/3Ni_1/3Co_1/3O₂ microspheres with F-doping

Layered F-doped cathode materials 0.3Li₂MnO₃–0.7LiMn_1/3Ni_1/3Co_1/3O_2−xF_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.