▎ 摘　　要

NOVELTY - Preparing a three-dimensional graphene/silicon composite system comprises transition metal elementary substance and/or transition metal element which includes silicon composite nano-particle, reacting in high temperature and then reducing in a reducing atmosphere; growing three dimensional graphene on the three-dimensional porous metal catalyst template/silicon composite system by chemical vapor deposition to obtain a three-dimensional graphene/silicon composite system with a catalyst frame work; and the three-dimensional graphene/silicon composite with catalyst framework is etched. USE - The method is useful for preparing a three-dimensional graphene/silicon composite system. The method is adopted for preparing cathode material of a lithium ion battery or a lithium ion battery. ADVANTAGE - The system has the small volume rate, high electronic conductivity, flexibility, and has excellent thermal and mechanical properties, has a wide range of applications e.g. applied to lithium ion battery anode material ensuring electrode capacity, improves battery cycle life and stability; the preparation process is simple, has high quality and suitable for large-scale implementation. DETAILED DESCRIPTION - Preparing a three-dimensional graphene/silicon composite system comprises transition metal elementary substance and/or transition metal element which includes silicon composite nano-particle, reacting in high temperature and then reducing to 400-1000 degrees C in a reducing atmosphere to obtain three-dimensional porous metal catalyst template/silicon composite system; growing three dimensional graphene on the three-dimensional porous metal catalyst template/silicon composite system by chemical vapor deposition to obtain a three-dimensional graphene/silicon composite system with a catalyst frame work; and the three-dimensional graphene/silicon composite with catalyst framework is etched to obtain a three-dimensional graphene/silicon composite powder.