Electrochemical performance of Li-rich cathode material, 0.3Li2MnO3-0.7LiMn1/3Ni1/3Co1/3O2 microspheres with F-doping

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 226mAhg(-1) over 100 cycles at 0.1C and excellent rate performance with discharge capacity of 96 mAhg(-1) at 5.0C and room temperature. Particularly, this material shows much enhanced electrochemical performances even at high temperature of 55 degrees C. It delivers a quite high discharge capacity of 233.7 mAhg(-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.