Cathode composite material and lithium ion battery using the same

摘要

A cathode composite material includes a cathode active material and a coating layer coated on a surface of the cathode active material. The cathode active material includes a lithium cobalt oxide. The coating layer includes a lithium metal oxide having a crystal structure belonging to C2/c space group of the monoclinic crystal system. The present disclosure also relates to a lithium ion battery including the cathode composite material.

主权项

1. A cathode composite material comprising a cathode active material and a coating layer coated on a surface of the cathode active material, the cathode active material comprises a lithium cobalt oxide, the coating layer comprises a lithium metal oxide having a crystal structure that belongs to C2/c space group of the monoclinic crystal system, wherein a general formula of the lithium metal oxide is [Li1-2aMa□a][Li1/3-2b-cMbN3cA2/3-2c□b]O2 wherein A represents a metal element having a +4 valence, M and N respectively represent doping chemical elements, “□” represents an atom vacancy occupying a Li site of [Li][Li1/3A2/3]O2, 0≦2a<1, 0≦2b+c<1/3, and 0≦2c<2/3.