▎ 摘　　要

NOVELTY - Producing (P1) thin film graphene oxide-bonded metal foil current collector for battery or supercapacitor, comprises: (a) preparing graphene oxide gel having graphene oxide molecules dissolved in a fluid medium; (b) dispensing and depositing layer of graphene oxide gel onto at least one of two primary surfaces of metal foil to form layer of wet graphene oxide gel deposited on it; (c) partially or completely removing fluid medium from deposited wet layer of graphene oxide gel to form dry film of graphene oxide; and (d) heat treating the dry film of graphene oxide. USE - The process is useful for producing a thin film graphene oxide-bonded metal foil current collector for a battery or supercapacitor. ADVANTAGE - The process provides the graphene oxide film, which: exhibits an inter-graphene spacing of less than 0.337 nm and a mosaic spread value of less than 1, a degree of graphitization of not less than 40% and/or a mosaic spread value of less than 0.7, and a degree of graphitization of not less than 80% and/or a mosaic spread value of not greater than 0.4; and has an electrical conductivity of greater than 3000 S/cm, preferably greater than 15000 S/cm, a thermal conductivity of greater than 600 W/mK, preferably greater than 1500 W/mK, a physical density of greater than 1.8 g/cm3, preferably greater than 2 g/cm3, and/or a tensile strength of greater than 40 MPa, preferably greater than 80 MPa (claimed). The process provides graphene oxide-bonded thin metal foil which is electrolyte-compatible, non-reactive, corrosion-protective, of low contact resistance, thermally and electrically conductive, ultra-thin, and lightweight, enabling a battery or capacitor to deliver a higher output voltage, higher energy density, high rate-capability, and much longer cycle life. DETAILED DESCRIPTION - Producing (P1) a thin film graphene oxide-bonded metal foil current collector for a battery or supercapacitor, comprises: (a) preparing a graphene oxide gel having graphene oxide molecules dissolved in a fluid medium, where the graphene oxide molecules contain higher than 20 wt.% of an oxygen; (b) dispensing and depositing a layer of the graphene oxide gel onto at least one of two primary surfaces of a metal foil to form a layer of wet graphene oxide gel deposited on it, where the dispensing and depositing procedure includes shear-induced thinning of the graphene oxide gel; (c) partially or completely removing the fluid medium from the deposited wet layer of graphene oxide gel to form a dry film of graphene oxide having an inter-plane spacing (d002) of 0.4-1.2 nm as determined by X-ray diffraction and not less than 20 wt.% oxygen; and (d) heat treating the dry film of graphene oxide to form the thin film graphene oxide-bonded metal foil current collector at a heat treatment of 80-2500 degrees C to an extent that inter-plane spacing is decreased to a value of 0.335-0.5 nm and the oxygen content is decreased to less than 10 wt.%. The thin film of graphene oxide has a thickness of 10 nm to 10 mu m, a physical density of 1.3-2.2 g/cm3, and all graphene oxide sheets being oriented substantially parallel to each other and parallel to the at least one primary surface. An INDEPENDENT CLAIM is also included for producing (P2) thin film graphene oxide-bonded metal foil current collector, comprising preparing a bath of graphene oxide gel having graphene oxide molecules dissolved in a fluid medium, where the graphene oxide molecules contain higher than 20 wt.% of oxygen and the graphene oxide gel has a pH value of less than 5, feeding a sheet of a metal foil into the bath and moving the sheet of metal foil out of the bath, enabling deposition of a wet layer of graphene oxide gel onto each of two primary surfaces of the metal foil, and the steps (c) and (d) as above per se.