▎ 摘　　要

NOVELTY - Preparation of graphene-cobalt pyrovanadate composite material comprises adding graphene oxide in deionized water, dispersing for 4-6 hours, adding 0.09-0.1g cobalt chloride hexahydrate, 0.7-0.71 g methenamine, 0.23-0.24g ammonium metavanadate, dispersing for 30-60 minutes, placing in water bath at 70-80 degrees C, mixing for 3-4 hours, cooling to room temperature, washing with deionized water and ethanol, drying at 40-60 degrees C for 6-8 hours and heating at 500-600 degrees C for 2 hours. USE - Method of preparing graphene-cobalt pyrovanadate composite material used as large-capacity energy storage system or lithium-ion battery for energy electric vehicle (claimed). ADVANTAGE - The method has simple process, low temperature, low cost, short experimental period and good repeatability and improves the cycle performance and rate performance.