POROUS PARTICLES OF INTERCONNECTED 3D GRAPHENE AS A SUPERCAPACITOR ELECTRODE ACTIVE MATERIAL AND PRODUCTION PROCESS

摘要

A process for producing a supercapacitor electrode, comprising (a) subjecting multiple particles of MCMBs to a chemical activation with an activating agent selected from an acid, a base, or a salt at a temperature from 100°C to 1,200°C for a period of 0.5 to 24 hours sufficient to produce multiple porous particles each of a monolithic 3D graphene structure comprising multiple pores and a continuous 3D network of graphene pore walls comprising continuous or naturally interconnected graphene ligaments of 1-20 graphene planes of carbon atoms; (b) producing a suspension containing these multiple porous particles, an optional conductive additive, and an optional resin binder in a liquid medium; and (c) depositing the suspension onto at least a primary surface of a current collector to form a wet layer and removing liquid medium from the wet layer to form the supercapacitor electrode.