LAYERED POSITIVE ELECTRODE MATERIAL, AND PREPARATION METHOD THEREFOR AND USE THEREOF

Provided is a method for preparing a layered positive electrode material, comprising the following steps: (1) mixing layered nickel cobalt manganese hydroxide with a lithium source, carrying out primary sintering in an oxygen atmosphere, pulverizing and sieving to obtain a primary sintering product; and (2) carrying out secondary sintering on the primary sintering product in a sulfur dioxide atmosphere to obtain a layered positive electrode material, of which the chemical formula is NiCoMn(OH), wherein 0.3≤a≤0.95, 0.03≤b≤0.12, 0.01≤c≤0.10, and a+b+c=1. Also provided are a layered positive electrode material obtained by the preparation method and a lithium-ion battery comprising the layered positive electrode material. In the preparation method, the secondary sintering is carried out in a sulfur dioxide atmosphere to cause the sulfur dioxide and the primary sintering product to be in full contact with each other and reacted, the sulfur dioxide reacts with residual alkali on the surface of the positive electrode material to produce lithium sulfate, thereby achieving the objective of reducing the surface residual alkali and pH value and improving electrochemical performance of the material.