▎ 摘　　要

NOVELTY - Composite coated lithium ion battery cathode material comprises positive electrode base material and composite coating layer coated on the outer surface of the positive electrode base material. The composite coating layer is composed of an electronic conductor material and a positive electrode lithium supplement material. USE - Composite coated lithium ion battery cathode material. ADVANTAGE - The cathod material is prepared by using the electronic conductor material together with the positive electrode lithium supplement material as a coating, which can improve the poor conductivity of the positive electrode lithium supplement material, thereby improving the rate performance of the material, and also improve the poor conductivity of the lithium-removed products of the positive electrode replenishing material, and avoid the deterioration of the battery system caused by the lithium-removed product, so as to increasing the service life of the battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a composite-coated lithium ion battery cathode material, which involves: a).coating the outer surface of the positive electrode base material of the lithium ion battery with a double-layer coating layer:b).coating the outer surface of the positive electrode base material with the positive electrode lithium-supplementing material layer;c).coating the outer surface of the positive electrode lithium-supplementing material layer with the electronic conductor material layer or coating first the electronic conductor material on the outer surface of the positive electrode lithium supplement material to obtain a double-layer coating shell layer;d).coating the double-layer coating shell layer on the outer surface of the positive electrode base material;e).coating a single coating layer on the outer surface of the positive electrode material of the lithium ion battery:f).mixing electronic conductor material and the positive electrode lithium supplement material to obtain a mixed coating layer;g).coating the mixed coating layer on the outer surface of the positive electrode material to obtain composite-coated lithium ion battery cathode material.