This invention provides a lithium ion battery cathode active material, the lithium-ion battery using the material, and the material preparation method. The cathode active material includes lithium, nickel, manganese, cobalt transition metal oxides and lithium cobalt transition metal oxides after coating handled. The cathode active material is daubed on at least one surface of lithium ion battery core anode slide. The lithium cobalt transition metal oxide and the coated source mix evenly in the solvent, evaporating to remove the solvent, high temperature handling, cooling, and then mixed with lithium nickel manganese cobalt transition metal oxides to get the cathode active material. The lithium-ion batteries using the cathode active material of this invention have been significantly improved for several areas such as safety performance, storage performance, the cycle performance under high temperature, and so on.