▎ 摘　　要

NOVELTY - Preparing a cobalt-doped antimony oxychloride composite negative electrode material, comprises dispersing graphene oxide in deionized water, adjusting the pH to 0-6, and stirring in air to form a uniform graphene aqueous solution. A certain proportion of cobalt salt and antimony salt is dissolved in a certain amount of graphene aqueous solution under heating and stirring in the air until the solution becomes an opaque suspension. The molar ratio of cobalt and antimony elements is 1:100-1:20. The obtained solution is placed in a hydrothermal reaction kettle, and a hydrothermal reaction is carried out under certain temperature and time conditions to generate cobalt-doped antimony chloride oxide with a doping amount of 1 to 5 mol%. The generated cobalt-doped antimony oxychloride is washed with a washing solvent and then put into a vacuum oven for drying. USE - Method for preparing a cobalt-doped antimony oxychloride composite negative electrode material used in aqueous chloride ion battery (claimed). ADVANTAGE - The method improves the physical and chemical properties of the material itself, and has simple preparation steps, low cost, and easy control of process conditions. DETAILED DESCRIPTION - Preparing a cobalt-doped antimony oxychloride composite negative electrode material, comprises dispersing graphene oxide in deionized water, adjusting the pH to 0-6, and stirring in air to form a uniform graphene aqueous solution. A certain proportion of cobalt salt and antimony salt is dissolved in a certain amount of graphene aqueous solution under heating and stirring in the air until the solution becomes an opaque suspension. The molar ratio of cobalt and antimony elements is 1:100-1:20. The obtained solution is placed in a hydrothermal reaction kettle, and a hydrothermal reaction is carried out under certain temperature and time conditions to generate cobalt-doped antimony chloride oxide with a doping amount of 1 to 5 mol%. The generated cobalt-doped antimony oxychloride is washed with a washing solvent and then put into a vacuum oven for drying. The prepared sample is placed in a muffle furnace and annealed under certain temperature conditions and atmosphere. The annealed sample is ground and pulverized to obtain cobalt-doped antimony oxychloride powder. An INDEPENDENT CLAIM is included for a cobalt-doped antimony oxychloride composite negative electrode material, which is prepared by using the method.