▎ 摘　　要

NOVELTY - Silicon composite nano fiber comprises carbon-silicon composite core fiber and a graphene cladding layer covering the carbon-silicon composite core fiber. The carbon-silicon composite core fiber includes carbon fiber and silicon-based material particles embedded at least inside the carbon fiber. USE - The cathode sheet is useful for secondary battery (claimed). ADVANTAGE - The silicon composite nano fiber has high capacity and conductive performance, excellent structure and cyclic performance, and excellent mechanical property. The method is stable structure and electrochemical performance of the silicon-containing composite nano fiber film, and high efficiency. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: ilicon composite nano fiber film; a method for preparing silicon composite nano fiber film; and a cathode sheet.