▎ 摘　　要

NOVELTY - Manufacturing (M1) a graphene composite, including an ultrasonic-wave pulverization post-treatment process, comprises: (a) radiating a microwave on a mixture of graphite oxide and a conducting agent; (b) dispersing a resultant material, obtained during the radiating the microwave, in a liquid and performing ultrasonic-wave pulverization; and (c) freeze-drying particles subjected to the ultrasonic-wave pulverization. USE - The method is useful for manufacturing a graphene composite, which is useful for manufacturing an active material for a supercapacitor (all claimed), which is useful as energy storage device. ADVANTAGE - The method provides graphene composite having improved bindability with spherical activated carbon, where the graphene composite provides the active material that exhibits excellent specific capacitance and can be thinly and densely applied to provide the supercapacitor having improved efficiency and improved storage performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for manufacturing (M2) an active material for a supercapacitor, comprising step (a)-(c) as per se, and (d) mixing the formed graphene composite and an activated carbon for the active material.