Preparation method of carbon-encapsulated high-nickel ternary cathode material

The invention discloses a preparation method of a carbon-encapsulated high-nickel ternary cathode material. A carbon nanomaterial dispersion liquid and a ternary cathode material are mixed and dispersed evenly to obtain a mixed slurry; the mixed slurry is dried to obtain the carbon-encapsulated high-nickel ternary cathode material. A carbon nanomaterial having the hydrophobic characteristic is encapsulated on the surface of the ternary cathode material, the problem of slurrying in the processing process of the high-nickel ternary cathode material is effectively solved; in addition, the carbonnanomaterial having the hydrophobic characteristic covers the surface of the high-nickel ternary cathode material through wet mixing and heat treatment; the reaction between water and carbon dioxide in the air with a matrix, the high-nickel cathode material, is effectively limited, the erosion of the matrix, the high-nickel ternary cathode material, caused by an electrolyte in the charge-dischargeprocess is effectively in