China Nonferrous Metallurgy

In order to improve the electrochemical properties of LiNi_1/3Co_1/3Mn_1/3O₂ cathode materials, such cathode materials were coated with graphene oxide, and the effects of the amount of graphene oxide coating on the structural morphology and electrochemical properties of LiNi_1/3Co_1/3Mn_1/3O₂ cathode materials were studied through thermogravimetric analysis, SEM analysis, initial material charge-discharge curve, cycle property curve and rate property curve. The results showed that when the additive amount of graphene oxide was 8%, under the voltage platform of 2.75-4.3 V at the rate of 0.2C, the initial discharge capacity reached 165.37 mAh/g and the capacity retention ratio reached 96.50% after 30 cycles, while the capacity retention ratios at the rates of 0.5C and 1C were 95.2% and 92.89% respectively after 30 cycles. In addition, these materials have great cycle property and favorable rate property under different current densities.