▎ 摘　　要

NOVELTY - Method for preparing a positive electrode active material involves providing vanadate solution, in which the vanadate is chosen from at least one of orthovanadate, pyrovanadate and metavanadate, dissolving a vulcanizing agent it in an organic solvent to form a sulfur-containing organic solution, adding the vanadate solution and the sulfur-containing organic solution to a reaction kettle, adjusting the pH value to 8-12 after mixing, and carrying out a solvothermal reaction at 140-200 degrees C for 15-30 hours, in which the molar ratio of vanadium contained in the acid salt solution to sulfur contained in the sulfur-containing organic solution is (1:4)-(1:10), cooling the reaction product and centrifuging to collect the precipitate, washing with deionized water to neutrality, and vacuum drying to obtain a 3-dimensional self-assembled nano vanadium tetrasulfide active material. USE - The method is useful for preparing a positive electrode active material, which is useful in aluminum secondary battery. ADVANTAGE - The material improves charge transfer, so that cycle performance of aluminum secondary battery is stably improved. DETAILED DESCRIPTION - Method for preparing a positive electrode active material of an aluminum secondary battery involves providing vanadate solution, in which the vanadate is chosen from at least one of orthovanadate of formula: M1V3O4, pyrovanadate of formula: MV2O7 and metavanadate of formula: MVO3, providing a vulcanizing agent and dissolving it in an organic solvent to form a sulfur-containing organic solution, in which the vulcanizing agent is selected from at least one of thiourea, thioacetamide, elemental sulfur, sodium sulfide and ammonium tetrathiomolybdate and the organic solvent comprises at least one of methanol, ethanol, propanol, butanol, ethylene glycol, acetone, butyl ester, glycerin, pyridine, propane, acetic acid and tetrahydrofuran, adding the vanadate solution and the sulfur-containing organic solution to a reaction kettle, adjusting the pH value to 8-12 after mixing, and carrying out a solvothermal reaction at 140-200 degrees C for 15-30 hours, in which the molar ratio of vanadium contained in the acid salt solution to sulfur contained in the sulfur-containing organic solution is (1:4)-(1:10), cooling the reaction product and centrifuging to collect the precipitate, washing with deionized water to neutrality, and vacuum drying to obtain a 3-dimensional self-assembled nano vanadium tetrasulfide active material. M1 = lithium, sodium,potassium, magnesium or ammonium. An INDEPENDENT CLAIM is included for an aluminum secondary battery comprising a positive electrode composed of a positive electrode current collector and a positive electrode slurry coated on the positive electrode current collector, where the positive electrode slurry comprises 70-85 wt.% positive electrode active material, 10-20 wt.% conductive agent and 5-10 wt.% binder, the positive current collector is made of foamed nickel, foamed copper, foamed titanium, foamed iron, stainless steel mesh, carbon paper, carbon fiber cloth, tantalum foil, niobium foil or molybdenum foil, the conductive agent is chosen from acetylene at least one of black, carbon fiber, carbon nanotubes, Ketjenblack (RTM: Electroconductive carbon black), graphene, and Super-P (RTM: Conductive carbon black), and the binder comprises at least one of polyvinylidene fluoride, polyvinylpyrrolidone, sodium carboxymethyl cellulose, styrene butadiene rubber, polyacrylic acid, polytetrafluoroethylene and polyvinyl alcohol.