▎ 摘　　要

NOVELTY - A graphene-based sodium ion supercapacitor comprises a positive electrode current collector and a negative electrode current collector. The positive electrode current collector is coated with a positive electrode material layer comprising 80-90 %mass graphene-based sodium-vanadium phosphate, 6-10 %mass conductive agent and 4-10 %mass binder. An inner layer of the negative electrode current collector is sequentially coated with a conductive layer and a negative electrode material layer comprising 86-95 %mass activated carbon material, 3-8 %mass conductive agent and 2-6 %mass binder. USE - Graphene-based sodium ion supercapacitor (claimed). ADVANTAGE - The graphene-based sodium ion supercapacitor has improved energy density, and excellent cycle performance, and can rapidly and efficiently enables storage and release of charge through positive sodium ion dissociation reaction and negative electric double layer capacitance principle. DETAILED DESCRIPTION - A graphene sodium ion supercapacitor comprises a positive electrode current collector and a negative electrode current collector. The positive electrode current collector is coated with a composite positive electrode material layer comprising 80-90 %mass graphene-based sodium-vanadium phosphate (Na3V2(PO4)3), 6-10 %mass conductive agent and 4-10 %mass binder. An inner layer of the negative electrode current collector is sequentially coated with a conductive layer and a negative electrode material layer comprising 86-95 %mass activated carbon material, 3-8 %mass conductive agent and 2-6 %mass binder. The positive and negative electrode material layers are filled with an electrolyte and separated by a separator.