▎ 摘　　要

NOVELTY - The preparation method of graphene nanobelt/metal oxide nanobelt flexible composite membrane, involves: (S1) ultrasonically dispersing multi-walled carbon nanotubes into dilute sulfuric acid solution, adding potassium permanganate, heating and stirring, making it axially shear the multi-walled carbon nanotubes to prepare graphene nanoribbons, washing with deionized water, ultrasonically dispersing into aqueous solution; (S2) preparing metal oxide nanobelts by hydrothermal reaction method, washing with deionized water, and ultrasonically dispersing into aqueous solution; (S3) mixing the graphene nanobelt with the metal oxide nanobelt aqueous solution, stirring and sonicating to obtain a graphene nanobelt/metal oxide nanobelt composite material suspension; (S4) adding polyethylene glycol into water and stirring, heating to dissolve it, adding potassium hydroxide aqueous solution dropwise, stirring and heating to prepare potassium hydroxide/polyethylene glycol gel electrolyte. USE - Preparing nano graphene/metal oxide nanobelt flexible composite membrane for use in flexible super capacitor, flexible ion battery and other energy storage field (claimed). ADVANTAGE - The nano graphene/metal oxide nanobelt flexible composite membrane has a through-hole structure, excellent conductivity and flexibility.It can significantly improve the energy density, power density and mechanical stability of flexible energy storage devices. DETAILED DESCRIPTION - The preparation method of graphene nanobelt/metal oxide nanobelt flexible composite membrane, involves: (S1) ultrasonically dispersing multi-walled carbon nanotubes into dilute sulfuric acid solution, then adding potassium permanganate, heating and stirring the reaction, making it axially shear the multi-walled carbon nanotubes to prepare graphene nanoribbons, washing with deionized water, ultrasonically dispersing into aqueous solution; (S2) preparing metal oxide nanobelts by hydrothermal reaction method, washing with deionized water, and ultrasonically dispersing into aqueous solution; (S3) mixing the graphene nanobelt with the metal oxide nanobelt aqueous solution, stirring and sonicating to obtain a graphene nanobelt/metal oxide nanobelt composite material suspension; (S4) adding polyethylene glycol into water and stirring, heating to dissolve it, adding potassium hydroxide aqueous solution dropwise, stirring and heating to prepare potassium hydroxide/polyethylene glycol gel electrolyte; (S5) pouring the suspension of the graphene nanobelt/metal oxide nanobelt composite material into its surface, and continuing vacuum filtration to obtain a double-layer membrane of graphene nanobelt/graphene nanobelt/metal oxide nanobelt; and (S6) adding aqueous polyurethane emulsion to the surface of the double-layer membrane and leaving it stand to allow it to leak naturally and absorb into the double-layer membrane, then adding the potassium hydroxide/polyethylene glycol gel electrolyte solution and carrying out continuous suction filtration, where the potassium hydroxide in it will cause the water-based polyurethane emulsion to demulsify, so that the aqueous polyurethane can be coated and bonded on the surface of graphene nanoribbons and metal oxide nanoribbons, and the potassium hydroxide/polyethylene glycol gel electrolyte can also be adsorbed to the double-layer membrane, and a graphene nanoribbon/metal oxide nanoribbon flexible composite membrane is finally obtained. An INDEPENDENT CLAIM is included for a nano graphene/metal oxide nanobelt flexible composite membrane.