Preparation method of lithium ion battery silicon oxide/carbon composite negative pole material

The invention discloses a preparation method of a high-specific-capacity silicon oxide/carbon composite material for lithium ion battery negative poles, belonging to the fields of new materials and electrochemistry. The silicon oxide/carbon composite material disclosed by the invention has the characteristics of a glass structure; nano primary particles constitute micro secondary particles, and thus, the silicon oxide/carbon composite material has compact structure and high tap density. Ethyl orthosilicate used as a silicon source is subjected to one-step sol-gel and atmospheric-pressure drying in combination with a heat treatment technique to prepare the silicon oxide/carbon composite negative pole material. The invention has the advantages of simple technical process and mild conditions, and is convenient for large-scale preparation. The silicon oxide/carbon composite negative pole material prepared by the method has higher specific capacity and favorable loop stability, and thus, is an ideal lithium ion battery negative pole material, thereby having favorable market prospects.