Effects of the Li:(Mn + Co + Ni) molar ratio on the electrochemical properties of LiMn{sub}(1/3)Co{sub}(1/3)Ni{sub}(1/3)O{sub}2 cathode material

摘要

Li{sub}(1+x)(Mn{sub}(1/3)Co{sub}(1/3)Ni{sub}(1/3)){sub}(1-x)O{sub}2 (x≥ 0) mixed oxides with different Li/M molar ratios (M = Mn{sub}(1/3)Co{sub}(1/3)Ni{sub}(1/3)) were obtained. The materials were characterized using chemical analysis, X-ray diffraction measurement, particle size distribution measurement, BET, and QOCV measurement. Rate performance and cycling performance were evaluated. Increased Li/M molar ratio, especially 1.10 < Li/M < 1.15, resulted in better cycling and rate performance as well as higher first cycle coulombic efficiency, As the discharge capacity is lower when Li/M molar ratio is greater than 1.10, the optimum ratio seems to be around 1.10.