▎ 摘　　要

NOVELTY - Interconnected flexible nano-silicon composite powder comprises composite matrix and a graphene layer covering the surface of the composite matrix. The composite matrix includes nano-scale silicon powder (110), micro-scale graphite powder (120) and nano-scale carbon material (130). The nanoscale carbon material includes carbon nanotubes (131) and/or graphene powder (132). The graphene layer is many vertical graphene sheets (140), and the surfaces of the nano-scale silicon powder, the micro-scale graphite powder and the nano-scale carbon material are all connected with many vertical graphene sheets. USE - Interconnected flexible nano-silicon composite powder for use in preparation of negative electrode materials for lithium ion batteries (claimed). ADVANTAGE - The interconnected flexible nano-silicon composite powder has a stable structure, excellent negative electrode capacity, first charge-discharge efficiency, rate capability, electrochemical cycle stability, conductivity, low expansion rate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing interconnected flexible nano-silicon composite powder, which involves mixing the nano-scale silicon powder, the micro-scale graphite powder and the nano-scale carbon material; subjecting the composite matrix to a deposition reaction in a graphene reaction source gas, the graphene reaction source gas includes carbon source gas and hydrogen, the volume ratio of the carbon source gas to the hydrogen gas is 1:(2-7). DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of interconnected flexible nano-silicon composite powder. Nano-scale silicon powder (110) Micro-scale graphite powder (120) Nano-scale carbon material (130) Carbon nanotubes (131) Graphene powder (132) Vertical graphene sheets (140)