Method for surface modification of lithium transition metal oxide positive electrode material

A method for surface modification of a lithium transition metal oxide cathode material, comprising the following steps:

• S1:
• adding a first additive, a second additive and a lithium transition metal oxide into water and stirring to obtain a first slurry, wherein the first additive is a lithium-containing phosphate, the lithium-containing phosphate is at least one of lithium-containing orthophosphate or lithium-containing metaphosphate, and the second additive is an acidic solution of Y3+ salt or Al1+ salt;
• S2:
• adding a third additive dropwise into the first slurry and stirring to obtain a second slurry, wherein the third additive is an acidic solution of TiO2+ salt or ZrO2+ salt;
• S3:
• adding a fourth additive dropwise into the second slurry and stirring to obtain a third slurry, wherein the fourth additive is an alkaline solution of AlO2 salt;
• and
• S4:
• centrifuging the third slurry and drying to obtain an intermediate product;
• mixing the intermediate product with a large-particle cathode material and sintering to obtain a surface-modified lithium transition metal oxide material.