▎ 摘　　要

NOVELTY - The cathode material is a core-shell structure. The core is silicon-based particles/M-carbon composite particles, in which M is a transition metal or its compound. The coating layer is a carbon layer. The core is prepared by obtaining silicon-based particle/M composite material through silicon-based particles and transition metal source, and then adding carbon source for secondary granulation method. USE - Used as high performance silicon-based lithium ion battery cathode material. ADVANTAGE - The inert product produced during the lithium insertion process of the silicon-based material is activated by introducing the substance containing the transition metal element, thus improving the first Coulomb efficiency of the silicon-based material. The process can realize the industrial production of lithium ion batteries with high specific capacity, long cycle life and excellent performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of the high performance silicon-based lithium ion battery cathode material comprising (i) taking silicon-based particles and transition metal source as raw material, preparing silicon-based particle/M composite material, as first precursor material; (ii) adding carbon source material and uniformly mixing with the first precursor material; obtaining the silicon-based particles/M-carbon particle as second precursor material by a secondary granulation method; and (iii) coating uniform and continuous carbon layer on the surface of the second precursor material by solid phase sintering or vapor deposition; finally obtaining the silicon-based particle/M-carbon at carbon composite material.