▎ 摘　　要

NOVELTY - A graphene/lignin-based activated carbon composite preparing method involves dissolving lignin and alkaline substances in deionized water, stirring, evaporating to dryness to prepare lignin-based activated carbon. Oxidated lignin is mixed with activated carbon graphite, ultrasonic dispersed, crosslinking agent is added, at room temperature, and dried to obtain oxidized graphite/lignin-based activated carbon composites, followed by dispersing graphite oxide/lignin-based activated carbon composites and potassium hydroxide in deionized water, filtering, drying to obtain finished product. USE - Method for preparing graphene/lignin-based activated carbon composite for use in supercapacitor. ADVANTAGE - The carbon composite has greater surface area, mass transfer resistance, superior conductivity, and high performance, and can be prepared in simple, and cost effective manner. DETAILED DESCRIPTION - A graphene/lignin-based activated carbon composite preparing method involves dissolving lignin and alkaline substances in deionized water, stirring, evaporating to dryness under inert atmosphere to prepare lignin-based activated carbon. Oxidated lignin is mixed with activated carbon graphite, ultrasonic dispersed, crosslinking agent is added, at room temperature, and dried to obtain oxidized graphite/lignin-based activated carbon composites, followed by dispersing graphite oxide/lignin-based activated carbon composites and potassium hydroxide in deionized water, mixing, filtering, drying after mixed under reducing atmosphere with an inert gas to obtain finished product.