PREPARATION METHOD FOR GRAPHENE/TITANIUM DIOXIDE HOLLOW SPHERE/SULPHUR COMPOSITE MATERIAL

摘要

Provided is a preparation method for a graphene/titanium dioxide hollow sphere/sulphur composite material, comprising the following steps: (1) adding graphene to an aqueous solution and implementing ultrasonic dispersion to form a suspension; (2) adding titanium sulphate and ammonium chloride to the suspension in turn and mixing uniformly, adding same to a hydrothermal kettle to implement a hydrothermal reaction, and after completion of the reaction, cooling naturally, filtering, washing with water, washing with ethanol, and drying to obtain a hollow titanium dioxide graphene composite material; and (3) adding the hollow titanium dioxide graphene composite material and elemental sulphur to carbon disulphide, implementing ultrasonic dispersion to form a suspension, and then evaporating the solvent to obtain a graphene/titanium dioxide hollow sphere/sulphur composite material. The titanium dioxide hollow spheres in the graphene/titanium dioxide hollow sphere/sulphur composite material are covered with a sulphur base material, and can inhibit the dissolution of polysulphides from the discharge product and mitigate volume expansion, improving electrochemical performance.