High-nickel positive electrode material and preparation method therefor, and lithium ion battery

Abstract

The present disclosure relates to a high-nickel positive electrode material and a preparation method therefor and a lithium ion battery, wherein a general chemical formula of the high-nickel positive electrode material is represented by formula (1): LixNi1−(a+b+c+d+e+f)CoaM1bM2cM3dM4eM5fO2 (1), where 0.95≤x≤1.2, 0≤a≤0.15, 0≤b≤0.10, 0≤c≤0.05, 0≤d≤0.05, 0≤e≤0.05, 0≤f≤0.05, and 0<a+b+c+d+e+f≤0.2. There is a relatively small amount of Ni3+ and a relatively large amount of Ni2+ in the surface of the high-nickel material in the present disclosure, which can avoid oxidation of the surface of the positive electrode material during lithium deintercalation, and facilitate maintaining structural stability of the positive electrode material, thereby avoiding loss of the positive electrode active material and the electrolytic solution, and further improving the capacity of the positive electrode material, so that the high-temperature cycle performance of the high-nickel positive electrode material is obviously improved.

Dependencies are inferred from the claim text.