▎ 摘　　要

NOVELTY - Lithium-ion positive electrode material comprises a positive electrode material layer, a spinel layer coated on the surface of the positive electrode material layer, and lithium nickel oxide coated on the surface of the spinel layer. The spinel layer includes nickel stannate-reduced graphene oxide. USE - Lithium-ion positive electrode material. ADVANTAGE - The lithium-ion positive electrode material is a modified cathode material with a layered-spinel-layered structure gradient, where the structure can show excellent high-voltage cycling stability and rate capability when applied to a lithium ion battery. DETAILED DESCRIPTION - Lithium-ion positive electrode material comprises a positive electrode material layer of formula LiNixCoyMnzO2, a spinel layer coated on the surface of the positive electrode material layer, and lithium nickel oxide coated on the surface of the spinel layer. The spinel layer includes nickel stannate-reduced graphene oxide. X, y and z=0-1. INDEPENDENT CLAIMS are included for the following: (1) a method for preparing lithium-ion positive electrode material, which involves carrying out co-precipitation reaction on a tin source and a nickel source in alkali liquor to obtain a precursor material, mixing the precursor material with a positive electrode material and then sintering to obtain the lithium-ion positive electrode material; and (2) a lithium-ion battery, which comprises a positive electrode material and a negative electrode material, where the positive electrode material is the lithium-ion positive electrode material.