▎ 摘　　要

NOVELTY - The method involves impregnating the straw and other agricultural waste after crushing with an aqueous solution of graphene whose doping and coating process. The nitrogen-containing compound precursor is mixed with graphene after drying of carbonized and activated at precursor having specific 600-900 degrees in an inert atmosphere. The water is dried to obtain activated carbon/graphene composites after washing of graphene. USE - Method of preparing long-term high specific energy super-capacitor electrode materials. ADVANTAGE - The performance of supercapacitors is improved with high energy density, high power density and long cycle life. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a low cost active coal/graphene composite material. DESCRIPTION OF DRAWING(S) - The drawing shows the screenshot of the scanning electric mirror image.