Patent ID: 8906449

Claim:
A method for making a cathode composite material of a lithium ion battery comprising steps of: forming a composite precursor comprising a cathode active material precursor and a coating layer precursor coated on a surface of the cathode active material precursor; reacting the composite precursor with a lithium source chemical compound, to lithiate both the cathode active material precursor and the coating layer precursor in the composite precursor, wherein the cathode composite material comprises a cathode active material and a coating layer, coated on a surface of the cathode active material; the coating layer comprises a lithium metal oxide; a general formula of the lithium metal oxide is [Li 1-2a M a □ a ][Li 1/3-2b-c M b N 3c A 2/3-2c □ b ]O 2 , and A represents a metal element having a +4 valence, M and N respectively represent doping chemical elements, and “□” represents an atom vacancy occupying a Li site of [Li][Li 1/3 A 2/3 ]O 2 , 0≦2a<1, 0≦2b+c<⅓, and 0≦2c<⅔.