TERNARY POSITIVE ELECTRODE MATERIAL PRECURSOR, PREPARATION METHOD THEREFOR, TERNARY POSITIVE ELECTRODE MATERIAL, LITHIUM ION BATTERY AS WELL AS POSITIVE ELECTRODE, AND ELECTRIC DEVICE

The present application relates to a ternary positive electrode material precursor and a preparation method thereof, a ternary positive electrode material, a lithium-ion battery, a positive electrode, and electric-involved equipment. The ternary positive electrode material precursor includes, sequentially from inside to outside, a core layer, a first intermediate layer, a second intermediate layer, and a shell layer, in which porosities of the core layer, the first intermediate layer, and the second intermediate layer increase in the mentioned order, and the shell layer has the smallest porosity or no porosity. The preparation method thereof includes: performing a first reaction of raw materials including a nickel-cobalt-manganese ternary metal salt mixed solution, a complexing agent, and a pH modifier to obtain a core layer; performing a second reaction by adjusting reaction conditions to form a first intermediate layer on a surface of the core layer; performing a third reaction by adjusting reaction conditions to form a second intermediate layer on a surface of the first intermediate layer; and performing a fourth reaction by adjusting reaction conditions to form a shell layer on a surface of the second intermediate layer. The ternary positive electrode material includes, sequentially from inside to outside, a layer A, a layer B, a layer C, and a layer D. The ternary positive electrode material precursor provided in the present application has excellent performance.