LITHIUM NICKEL MANGANESE COBALT OXIDE HIGH-NICKEL SINGLE-CRYSTAL POSITIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREFOR

A method of preparing lithium nickel manganese cobalt oxide high-nickel single-crystal positive electrode material comprises the following steps: mixing and ball milling nickel cobalt manganese hydroxide with a lithium source, zirconium oxide, tungsten oxide, and sodium carbonate, then performing primary sintering, pulverizing, and then obtaining an lithium nickel manganese cobalt oxide high-nickel single-crystal positive electrode material intermediate, the temperature of the primary sintering being 50-150° C. higher than a normal sintering temperature; and evenly mixing the lithium nickel manganese cobalt oxide high-nickel single-crystal positive electrode material intermediate and a coating agent, and then performing secondary sintering to obtain the lithium nickel manganese cobalt oxide high-nickel single-crystal positive electrode material.