▎ 摘　　要

NOVELTY - Graphene-coated silicon/carbon nanofiber composite membrane comprises silicon/carbon composite nanofiber membrane and graphene layer which protects silicon/carbon composite nanofiber membrane. The graphene layer is covered on the silica/carbon composite nano fiber membrane surface, and silicon/carbon nano fiber film comprises silicon embedded with nanoparticles of carbon nano fiber. The silicon nano-particles are irregularly embedded on the surface and inner side of carbon nanometre fiber. USE - Graphene-coated silicon/carbon nanocomposite nanofiber membrane used in lithium ion batteries (claimed). ADVANTAGE - The graphene-coated silicon/carbon nanofiber composite membrane increases the capacity of lithium ion battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing graphene-coated silicon/carbon nanofiber composite membrane, which involves: (A) electrospining polyacrylonitrile and silicon nano-particles; (B) mixing and dispersing in N,N-dimethylformamide solvent; (C) stirring and dispersing ultrasonically to obtain the uniformililitery dispersed electrostatic spinning solution; (D) carbonizing in the air atmosphere and carbonizing again in argon atmosphere to obtain the silicon/carbon nano fiber composite film; (E) treating the nano fiber film with ethanol solution of nitric acid solution and 3-aminopropyltriethoxysilane (APTES) to make the surface of the fiber positively charged and immersing the film in an aqueous solution of graphene oxide; (F) introducing a layer of graphene oxide on the fiber membrane surface with the electrostatic interaction between two substances of different charges; and (G) reducing the graphene oxide on the surface of the fiber membrane.