Nickel-based multi-element cathode material of lithium ion battery and preparation method of nickel-based multi-element cathode material

The invention belongs to the field of energy materials, and provides a nickel-based multi-element cathode material of a lithium ion battery. The cathode material is a powder material; the chemical formula is LiaNixCoyAlzO2/(BaTiO3)n; a is less than or equal to 1.2 and greater than or equal to 0.9; x is less than or equal to 0.95 and greater than or equal to 0.75; y less than or equal to 0.25 and greater than or equal to 0.05; z is less than or equal to 0.05 and greater than 0; n is less than or equal to 0.005 and greater than 0; and BaTiO3 is a coating layer. The invention further provides a preparation method of the cathode material. A uniform coating layer is formed on the surface of the nickel-based multi-element material through a surface coating technology; direct contact of a core material and electrolyte is stopped; side reaction between the material surface and the electrolyte is blocked; reaction of Ni and the electrolyte in the charging process is effectively stopped to maintain the stability of the material structure; and a layer of barium titanate coats the surface of the nickel-based multi-element material, so that the lithium ion battery can be prevented from becoming into an insulator due to surface resistance increase when the temperature rises too fast; and the safety performance of the battery is ensured.