SUPERCAPACITOR ELECTRODE HAVING HIGHLY ORIENTED AND CLOSELY PACKED GRAPHENE SHEETS AND PRODUCTION PROCESS

摘要

Provided is a process for producing an electrolyte-impregnated laminar graphene structure for use as a supercapacitor electrode. The process comprises (a) preparing a graphene dispersion having multiple isolated graphene sheets dispersed in an electrolyte; and (b) subjecting the graphene dispersion to a forced assembly procedure, forcing the multiple graphene sheets to assemble into an electrolyte-impregnated laminar graphene structure, wherein the multiple graphene sheets are alternately spaced by thin electrolyte layers, less than 5 nm in thickness, and the graphene sheets are substantially aligned along a desired direction, and wherein the laminar structure has a physical density from 0.5 to 1.7 g/cm³ and a specific surface area from 50 to 3,300 m²/g, when measured in a dried state of the laminar structure with the electrolyte removed. This process leads to a supercapacitor having a large electrode thickness, high active mass loading, high tap density, and exceptional energy density.