▎ 摘　　要

NOVELTY - The preparation method of graphene/ultra-long titanium dioxide (B) nano composite material involves reacting titanium dioxide in alkaline solution, stirring, cooling, separating and washing to obtain long-chain titanate nanotubes, soaking in acidic solution, suction-filtering, and washing to obtain long-chain titanate nanotubes precursor, preparing graphene oxide, and uniformly dispersing the graphene oxide and the long-chain titanate nanotubes precursor, filtering to obtain solid mixture, and calcining the obtained solid mixture. USE - Preparation method of graphene/ultra-long titanium dioxide (B) nano composite material for lithium ion battery. ADVANTAGE - The method enables preparation of graphene/ultra-long titanium dioxide (B) nano composite material with excellent conductive performance, and improved electrochemical performance. DETAILED DESCRIPTION - The preparation method of graphene/ultra-long titanium dioxide (B) nano composite material involves (1) reacting titanium dioxide in alkaline solution, controlling the stirring speed at 300-900 rpm during the reaction, cooling the mixture to room temperature, separating and washing to obtain long-chain titanate nanotubes, soaking the long-chain titanate nanotubes in acidic solution, suction-filtering, and washing to neutral to obtain long-chain titanate nanotubes precursor by multiple ion exchange, (2) preparing graphene oxide by Hummers method, and (3) uniformly dispersing the graphene oxide obtained in the step (2) and the long-chain titanate nanotubes precursor obtained in step (1), filtering to obtain solid mixture, and calcining the obtained solid mixture under the protection of inert atmosphere.