Preparation method of magnesium oxide coated lithium nickel manganese cobalt cathode material

The invention belongs to the technical field of battery materials, and discloses a preparation method of a magnesium oxide coated lithium nickel manganese cobalt cathode material. The method comprises the steps of raw material mixing, primary sintering, doping, secondary sintering and coating, wherein the step of raw material mixing comprises the steps that dispersing, even mixing and smashing are conducted on lithium carbonate, a nanometer spherical nickel cobalt manganese hydroxide precursor, polyacrylate and deionized water, and a uniform intermediate mixture is formed. The preparation method of the magnesium oxide coated lithium nickel manganese cobalt cathode material is low in primary sintering temperature, short in sintering time, simple in technology, large in specific capacity and good in cycling performance. The preparation method further has the advantages of being low in investment, reliable in technology, low in operating cost and the like, and the good economic benefit and market promotion value are achieved.