▎ 摘　　要

NOVELTY - Dual-ion battery comprises a cathode, a cathode, an electrolyte, and a separator spaced between the cathode and the cathode, graphene-based manganese carbonate as active material of the cathode and graphite carbon material as active material of the cathode. The graphene-based manganese carbonate is prepared by (i) mixing the graphene oxide, manganese source, solvent and acid alkali regulator to obtain alkaline first mixture, (ii) mixing the first mixture with reducing agent to obtain second mixture, (iii) carrying out hydrothermal reaction of second mixture to obtain graphene-based hydrogel, and (iv) dehydrating the graphene-based hydrogel to obtain graphene-based manganese carbonate. USE - Used as dual-ion battery. ADVANTAGE - The dual-ion battery: solves the technical problems that the existing dual-ion battery is prone to mismatch between the positive and negative materials and the incompatibility between the positive and negative materials and the electrolyte. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing dual-ion battery comprising (i) preparing the active material of the cathode, and preparing the active material of the cathode into a cathode, preparing the active material of the cathode, and preparing the active material of the cathode into a cathode, and graphite carbon material is used as the active material of the cathode, and the graphene-based manganese carbonate is prepared by (a) mixing the graphene oxide, manganese source, solvent and acid alkali regulator to obtain alkaline first mixture, (b) mixing the first mixture with the reducing agent to obtain second mixture, (c) carrying out hydrothermal reaction of second mixture to obtain graphene-based hydrogel, and (d) dehydrating the graphene-based hydrogel to obtain the graphene based manganese carbonate, and (ii) assembling the cathode, the anode, the electrolyte and the membrane into a double-ion battery.