▎ 摘　　要

NOVELTY - A graphene crystal material comprises 20 pts. wt. graphite, 0.1-1.2 pt. wt., preferably 1.0 pt. wt. ferroferric oxide, 0.1-1.2 pt. wt., preferably 0.2 pt. wt. iron powder and 0.1-0.5 pt. wt., preferably 0.2 pt. wt. activated carbon. USE - Graphene crystal material used in manufacture of capacitor (claimed). ADVANTAGE - The graphene crystal material provides capacitors with excellent electrochemical performance, specific capacity of more than 300 F/g and specific capacity reaching up to 954 F/g and excellent storage performance. The graphene crystal material is prepared by a simple, safe, environmentally-friendly and economically method suitable for industrial production, using easily available raw materials. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the graphene crystal material; and (2) capacitor.