▎ 摘　　要

NOVELTY - Porous silicon-carbon composite material comprises a core-shell structure, where the inner core is a composite of porous carbon, cerium dioxide and graphene component. The outer shell is nano silicon doped with oxide compound selected from phosphorus oxide, arsenic oxide and selenium oxide. The mass percentage of the shell is 1-20 wt.% based on the total weight of the porous silicon carbon composite material, and the mass percentages of the oxide is 1-5 wt.% based on the total weight of the shell. The mass ratio of cerium dioxide, porous carbon and graphene in the inner core is 1-5:30-50:0.5-2. USE - Porous silicon-carbon composite material for use in lithium ion battery, high-end digital, power battery. ADVANTAGE - The porous silicon-carbon composite material has high conductivity, high specific capacity characteristic of improving the charging capacity of the material, binding expansion of silicon in the charging and discharging process, improving the cycle performance, and the silicon coating is uniform, not easy to generate side reaction with the electrolyte, which is good for reducing the specific surface area of material, and improving the battery cycle life and high temperature performance, and reducing the gas in the battery circulation process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method of porous silicon-carbon composite material, which involves: (1) putting porous carbon, cerium oxide and graphene in an organic solvent and mixing homogeneously, and spray-dring to obtain the inner core; (2) using chemical vapor deposition to deposit nano-silicon on the surface of the inner core, and oxide compound is continuously deposited on the surface of the material by chemical vapor deposition, repeating the deposition of nano silicon and oxide to complete 1-100 cycles to obtain a composite material; (3) carbonizing the above composite material.