Tungsten-molybdenum composite coated ternary positive electrode material and preparation method thereof

The invention discloses a tungsten-molybdenum composite coated ternary positive electrode material. A nickel-cobalt-aluminum ternary material or a nickel-cobalt-manganese ternary material is used as a matrix, the outer surface of the matrix is coated with a tungsten-molybdenum composite oxide coating layer, and the molar ratio of the tungsten-molybdenum composite oxide to the total amount of nickel-cobalt-aluminum (or nickel-cobalt-manganese) in the ternary material is 0.01-0.2%. A preparation method of the tungsten-molybdenum composite coated ternary positive electrode material comprises the following steps: adding a tungsten compound and a molybdenum compound into a hydrogen peroxide solution and deionized water for hydrothermal reaction to obtain a tungsten-molybdenum composite coating material; carrying out dry mixing on the matrix and the tungsten-molybdenum composite coating material to carry out primary coating; and finally, sintering in an oxygen atmosphere furnace to obtain the tungsten-molybdenum co