▎ 摘　　要

NOVELTY - The lithium battery cathode has a cathode current collector and a protective layer set on the surface of the cathode current collector. The protective layer comprises a doped carbon material matrix and a transition metal compound particles. At least part of the transition metal compound particles are coated by the doped carbon material matrix. A cathode active material layer, preferably a lithium metal layer is arranged between the cathode current collector and the protective layer. The doping elements in the doped carbon material matrix are 5-10 wt.% of cobalt elements and 5-12 wt.% of nitrogen elements. The transition metal compound particles are cobalt 9S8, cobalt tetraoxide, iron carbide, molybdenum disulfide, zinc oxide or cobalt chloride. The carbon material is carbon nanofibers, carbon nanotubes, carbon nanorods or graphene (preferred). USE - Cathode for lithium battery used in digital cameras, mobile phones, notebook computers, electric bicycles and electric automobiles. ADVANTAGE - The protective layer contains the carbon material matrix and transition metal compound particles which are doped with nitrogen elements and cobalt elements together, so that the lithium affinity of the protective layer is effectively improved. The lithium affinity active sites are increased, and uniformly distributed in the protective layer, so that lithium ions can be uniformly deposited in the protective layer. Even if lithium dendrite generated by the negative electrode reaches the protective layer, the lithium affinity active sites in the protective layer are more and uniformly distributed, so that the phenomenon that the lithium ions are only deposited at the lithium dendrite is avoided, the lithium ions can be uniformly deposited at each part of the protective layer, and the growth of the lithium dendrite towards the positive electrode side is effectively prevented. The lithium ions uniformly deposited are not easy to generate dead lithium, so that the loss of the active capacity of the battery is avoided, and the safety performance and the cycle performance of the battery are greatly improved.