HIGH-NICKEL POSITIVE ELECTRODE MATERIAL, AND PREPARATION METHOD AND APPLICATION THEREOF

原文（中国語）

Provided in the present application are a high-nickel positive electrode material, and a preparation method and a use thereof. The high-nickel positive electrode material of the present application is a secondary particle formed by aggregation of primary crystal grains, and a grain boundary is included between adjacent primary crystal grains. A mass ratio of cobalt element to nickel element at the grain boundary in a surface layer of the secondary particle is A, the mass ratio of cobalt element to nickel element at the grain boundary in an interior of the secondary particle is B, and the mass ratio of cobalt element to nickel element of the primary crystal grains in the surface layer of the secondary particle is C, where A is greater than B and A is greater than C.