▎ 摘　　要

NOVELTY - A manganese three-dimensional graphene composite material preparation method involves fixing a three-dimensional graphene sheet on a synthetic glass sheet by silicon gel and putting potassium permanganate, hydrochloric acid, urea and water into a reaction kettle, followed by uniformly stirring to get mixture, where the fixed three-dimensional graphene sheet is put in the obtained mixture at 100-180 degrees C for 4-10 hours. The reacted three-dimensional graphene sheet is taken out and washed by distilled water for 3-5 times, followed by drying in the oven to get graphene composite material. USE - Method for preparing manganese three-dimensional graphene composite material for use in a super capacitor and a high capacitance value electrochemical electrode (claimed). ADVANTAGE - The method enables preparing manganese three-dimensional graphene composite material with high-ultra capacitance value in an effective manner. DETAILED DESCRIPTION - A manganese three-dimensional graphene composite material preparation method involves fixing a three-dimensional graphene sheet on a synthetic glass sheet by silicon gel and putting potassium permanganate, hydrochloric acid, urea and water into a reaction kettle, followed by uniformly stirring to get mixture, where the fixed three-dimensional graphene sheet is put in the obtained mixture at 100-180 degrees C for 4-10 hours. The reacted three-dimensional graphene sheet is taken out and washed by distilled water for 3-5 times, followed by drying in the oven to get manganese three-dimensional graphene composite material and connecting with metal wire to obtain high capacitance value electrochemical electrode.