▎ 摘　　要

NOVELTY - Graphene-loaded nitrogen-doped carbon-coated manganese selenide-based sodium/potassium ion battery anode material comprises manganese selenide-nanocrystalline-graphene. USE - Used as graphene-loaded nitrogen-doped carbon-coated manganese selenide-based sodium/potassium ion battery anode material. ADVANTAGE - The nanomaterial has high specific capacity, excellent cycle stability, high safety and high rate performance as anode of sodium/potassium ion battery. The method simple process, short synthesis time, controllable product morphology, and high repeatability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the graphene-loaded nitrogen-doped carbon-coated manganese selenide-based sodium/potassium ion battery anode material, comprising (1) taking certain amount of potassium permanganate, dissolving in an aqueous solution of concentrated sulfuric acid, stirring to form uniform solution, and transferring to a reactor for hydrothermal reaction, where the potassium permanganate mole number is 1-10 mmol, and the pH value of the aqueous solution of concentrated sulfuric acid is 0.5-2, (2) after the hydrothermal reaction is completed, washing and drying the precipitate to obtain manganese dioxide product, taking certain amount of manganese dioxide and adding to the tris-hydrochloride solution containing dopamine, continuing stirring for certain period of time at certain temperature, drying, performing high-temperature carbonization and reduction treatment, and after the reaction is completed, obtaining nitrogen-doped carbon-coated manganese oxide product, and (3) taking certain amount of manganese oxide product and selenium powder according to the stoichiometric ratio, keeping the temperature in argon atmosphere for certain period of time to complete the selenization treatment, ultrasonically treating the manganese selenide and graphene in certain amount of deionized water, and then freeze-drying to obtain graphene-loaded nitrogen-doped carbon-coated manganese selenide-based sodium/potassium ion battery anode material.