▎ 摘　　要

NOVELTY - Carbon-based cathode comprises cathode material and an electrolyte, where the cathode material is three-dimensional graphene-carbon ball sponge complex, the three-dimensional graphene-carbon ball sponge complex is three-dimensional graphene-carbon ball sponge with complex three-dimensional structure, the three-dimensional structure is a three-dimensional structure composed of graphene coated carbon ball sponge, so that the carbon ball sponge body in the three-dimensional structure based on the graphene electronic conduction, preferably, the electrolyte is sodium/potassium salt ester electrolyte. USE - Carbon-based cathode for sodium/potassium ion battery. ADVANTAGE - The carbon-based cathode uses graphene to wrap the carbon ball sponge body, realizing the electronic conduction capability of the carbon ball sponge body on the three-dimensional structure, at the same time, combining with the carbon ball sponge with excellent electrochemical performance, which can realize the reduction of the ion migration path of the complex in the sodium/potassium ion battery, so that it is good for the sodium/potassium ion to perform stable and reversible de-embedding in the electrode material, so as to improve the specific capacity and rate characteristics the carbon-based material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparation method of carbon-based cathode for sodium/potassium ion battery.