Patent ID: 8597818

Claim:
A lithium ion battery comprising: a cathode comprising a cathode current collector and a cathode material layer disposed on a surface of the cathode current collector, the cathode material layer comprises a cathode active material, a conductive agent, and an adhesive uniformly mixed together, the cathode active material comprises cathode active material particles and AlPO 4 layers coated on surfaces of the cathode active material particles; a separator comprising a porous membrane and a protective layer coated on a surface of the porous membrane, wherein the protective layer is configured to prevent the separator from being melted during charging or discharging of the lithium ion battery, and the protective layer comprises a dried reaction product fabricated from a phosphorous source having a phosphate radical, a trivalent aluminum source, and a metallic oxide mixed in a liquid phase solvent; an anode; and a nonaqueous electrolyte solution.