▎ 摘　　要

NOVELTY - Preparing spherical titanium dioxide/graphene flexible composite material comprises e.g. (i) adding 1-10 mg graphene oxide into 5 ml deionized water, carrying out ultrasonic treatment for 0.5-4 hours to ensure uniform graphene oxide dispersion, using hydrochloric acid solution to adjust the pH value of the oxidized graphene, maintaining dispersing liquid pH at 2-5 so that the surface of the stabilized graphene dispersion is negatively charged, (ii) synthesizing titanium alcohol molecules of regular spherical nano-structure: dispersing 1-30 mg titanium alkoxide molecules in deionized water. USE - The method is useful for preparing spherical titanium dioxide/graphene flexible composite material (claimed). ADVANTAGE - The method adopts graphene with three-dimensional connected network structure to replace the traditional metal current collector, does not use binder, conductive agent and other active material, uses electrode which is reduced in the proportion of active substance, improves the utilization rate of the active substance, is simple to operate and easy to scale. The composite material provides fast diffusion channel for lithium ions and electrons. DETAILED DESCRIPTION - Preparing spherical titanium dioxide/graphene flexible composite material comprises (i) adding 1-10 mg graphene oxide into 5 ml deionized water, carrying out ultrasonic treatment for 0.5-4 hours to ensure uniform graphene oxide dispersion, using 0.01 mol hydrochloric acid solution to adjust the pH value of the oxidized graphene, maintaining dispersing liquid pH at 2-5 so that the surface of the stabilized graphene dispersion is negatively charged, (ii) synthesizing titanium alcohol molecules of regular spherical nano-structure: dispersing 1-30 mg titanium alkoxide molecules in 5 ml deionized water, using 0.01 mol hydrochloric acid solution to adjust the pH value of the solution to 2-5, obtaining titanium alkoxide molecule with positively charged surface, (iii) adding graphene oxide solution in spherical titanium alkoxide molecules dispersion, stirring at room temperature uniformly, adopting vacuum filtration method, electrostatic self-assembling negatively charged spherical titanium alkoxide molecules solution with positively charged graphene oxide solution to obtain titanium alkoxide/graphene oxide material, (iv) adding titanium alkoxide/graphene oxide material with 60 ml deionized water at 60-150 degrees C, refluxing for 1-12 hours, drying in an oven at 80 degrees C, obtaining the titanium dioxide/graphene oxide material, and (v) adding 10 ml hydrazine hydrate into polyfluortetraethylene lined stainless steel reaction kettle to obtain the titanium dioxide/graphene oxide suspension, reducing for 1-12 hours at 80-180 degrees C, using deionized water and ethanol for washing, obtaining spherical titanium dioxide/graphene flexible composite material.