▎ 摘　　要

NOVELTY - Preparation of nitrogen-doped porous carbon/graphene composite involves sulfonating a polystyrene waste material using concentrated sulfuric acid, reacting resultant with a nitrogen group-containing compound and graphene, reacting resultant mixture at 600-1000 degrees C in inert gas atmosphere, carbonizing, activating, drying, washing using water and drying. USE - Preparation of nitrogen-doped porous carbon/graphene composite used as anode for lithium-ion battery and supercapacitor (all claimed). ADVANTAGE - The method provides nitrogen-doped porous carbon/graphene composite which enables formation of battery and supercapacitor having excellent cycle durability and high specific capacity.