▎ 摘　　要

NOVELTY - Supercapacitor electrode is produced by: (a) preparing a graphene dispersion having multiple sheets of a starting graphene material dispersed in a liquid medium; (b) dispensing and depositing the graphene dispersion onto a surface of a supporting substrate; (c) partially or completely removing the liquid medium from the wet layer of graphene material to form a dried layer of graphene material; (d) heat treating the dried layer of graphene material at a first heat treatment temperature of 80-3200 degrees C; and (e) impregnating the multiple pores with a liquid or gel electrolyte. USE - The process is useful for producing supercapacitor electrode. ADVANTAGE - The process leads to a supercapacitor having a large electrode thickness, high active mass loading, high tap density, and exceptional energy density. DETAILED DESCRIPTION - Supercapacitor electrode is produced by: (a) preparing a graphene dispersion having multiple sheets of a starting graphene material dispersed in a liquid medium, and where the dispersion contains an optional blowing agent having a blowing agent-to-graphene material weight ratio from 0/1.0 to 1.0/1.0; (b) dispensing and depositing the graphene dispersion onto a surface of a supporting substrate to form a wet layer of graphene material, where the dispensing and depositing procedure includes subjecting the graphene dispersion to an orientation-inducing stress; (c) partially or completely removing the liquid medium from the wet layer of graphene material to form a dried layer of graphene material; (d) heat treating the dried layer of graphene material at a first heat treatment temperature of 80-3200 degrees C at a desired heating rate sufficient to induce volatile gas molecules from the non-carbon elements or to activate the blowing agent for producing a layer of solid graphene foam, where the solid graphene foam is composed of multiple pores and pore walls, and the pore walls contain a pristine graphene material having essentially 0% of non-carbon elements, or a non-pristine graphene material having 0.001-5 wt.% non-carbon elements, and where the solid graphene foam has a physical density of 0.01-1.7 g/cm3, a specific surface area of 50-3300 m2/g, a thermal conductivity of greater than or equal to 200 W/mK per unit of specific gravity, and/or an electrical conductivity of no not less than 2000 S/cm per unit of specific gravity; and (e) impregnating the multiple pores with a liquid or gel electrolyte to form a layer of pre-impregnated solid graphene foam, which is subjected to a step of compressing or roll-pressing that reduces a pore size, improves orientation of graphene planes, and squeezes excess electrolyte out of the pre-impregnated solid graphene foam for forming the supercapacitor electrode.