Porous silicon-carbon composite negative electrode material and preparation method and application thereof

The invention discloses a porous silicon-carbon composite negative electrode material and a preparation method and application thereof, and belongs to the technical field of energy storage. The porous carbon deposited silicon nano composite material is formed by compounding porous carbon and silicon tetrachloride in a plasma chemical vapor deposition method. Complex preparation conditions and materials are not needed, only one plasma chemical vapor deposition device needs to be provided, so that the porous carbon and the silicon source can be compounded in a vapor deposition mode, high-temperature and high-pressure reactions are not involved in the preparation process, the safety standard is met, and the prepared porous carbon deposition silicon nano composite material has the advantages of being simple in preparation process and low in cost. In the charging and discharging process, silicon is deposited in porous carbon, the volume change of silicon can be effectively buffered, the method has the advantages o