Using silicon-based materials to prepare the negative electrode of lithium-ion batteries is of great significance to improving the performance of lithium-ion batteries, but the main challenges are the poor conductivity of silicon and the difficulty in maintaining the integrity of the structure during the cycle. Based on this article, a composite of graphene and carbon-coated silicon (Si@C-rGO) with a "sandwich" structure is synthesized, which not only improves the conductivity and mechanical properties, but also greatly improves the cycle performance.