▎ 摘　　要

NOVELTY - Preparing bimetallic sulfide/graphene composite film comprises adding transition metal salt and precipitating agent to water, mixing magnetically and uniformly to obtain homogeneous and transparent mixed solution, adding graphene oxide to water for ultrasonically dispersing to obtain graphene oxide solution, then adding mixed solution, and mixing to obtain a mixed solution, placing the mixed solution in a polytetrafluoroethylene-lined high-pressure reaction kettle, centrifuging the precipitate, washing, freeze-drying under vacuum to obtain double metallic hydroxide/graphene composite, adding double metallic hydroxide/graphene composite to water together with graphene oxide, dispersing to obtain a uniform mixture, then using a vacuum filtration device for depositing on the base film, drying, and then automatically detaching from the base film to obtain bimetallic hydroxide/graphene composite graphene oxide composite film, repeatedly washing with deionized water, and drying. USE - The film is useful for flexible supercapacitors. ADVANTAGE - The film: has loose layered structure, good flexibility and strength; greatly promotes the diffusion of ions and electrons between the composite membrane layers; and is endowed with excellent electrochemical performance, e.g. specific capacity, rate performance and cycle stability. DETAILED DESCRIPTION - Preparing bimetallic sulfide/graphene composite film comprises (a) adding two kinds of transition metal salt and precipitating agent to water, mixing magnetically and uniformly to obtain homogeneous and transparent mixed solution, (b) adding graphene oxide to water for ultrasonically dispersing to obtain graphene oxide solution, then adding mixed solution in a drop wise manner, and mixing uniformly and magnetically to obtain a mixed solution, (c) placing the mixed solution in a polytetrafluoroethylene-lined high-pressure reaction kettle, then placing in an oven for performing hydrothermal reaction, centrifuging the precipitate obtained from the hydrothermal reaction, washing, freezing in liquid nitrogen and freeze-drying under vacuum to obtain double metallic hydroxide/graphene composite, (d) adding double metallic hydroxide/graphene composite to water together with graphene oxide, ultrasonically dispersing to obtain a uniform mixture, then using a vacuum filtration device for performing vacuum filtering with a polymer filter film as the base film for depositing on the base film, then placing it together with the base film for drying at room temperature, and then automatically detaching from the base film after drying completely to obtain bimetallic hydroxide/graphene composite graphene oxide composite film, and (e) immersing the composite film in a high pressure reaction kettle lined with polytetrafluoroethylene containing sulfide solution, then repeatedly washing with deionized water, and drying at room temperature. An INDEPENDENT CLAIM is also included for bimetallic sulfide/graphene composite film prepared by the above method, where the bimetallic sulfide/graphene composite film is capable of assembling a three-dimensional graphene-based frame loaded with a bimetallic sulfide at a layer spacing of 200-500 nm.