POSITIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREFOR, AND LITHIUM ION BATTERY

A cathode material, a preparation method thereof, and a lithium ion battery are provided. The cathode material comprises cathode material particles comprising a central area, an intermediate layer, and a surface layer, wherein the intermediate layer is located between the central area and the surface layer; and the central area comprises a lithium oxide, the intermediate layer comprises elemental sulfur, and the surface layer comprises elemental sulfur and elemental carbon, in which the lithium oxide comprises δLiNiCoXO.(1-δ)LiMO, where 0≤δ≤1, X includes at least one selected from Mn, Al, Nb, and Fe, M includes at least one selected from Mn, Al, Nb, Fe, Co, and Ni, 0≤m