▎ 摘　　要

NOVELTY - Antimony-bismuth alloy material comprises carbon source-coated alloyed metal bismuth and metallic antimony, where the metallic bismuth and the metallic antimony are embedded in an one-dimensional carbon nanofiber to form a fibrous structure of a carbon-coated bismuth-antimony alloy; and the carbon source is polyvinylpyrrolidone. USE - The antimony bismuth alloy material is useful in preparing negative electrode of a sodium ion secondary battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing the antimony-bismuth alloy material comprising (1) adding polymethyl methacrylate into N-N-dimethylformamide or N-N-dimethylacetamide, stirring, fully dissolving, and continuously stirring until the solution is transparent to obtain a spinning solution A solution, (2) dissolving bismuth metal salt and antimony metal salt in a solution A in batches, stirring and dissolving, then adding polyvinylpyrrolidone or polyacrylonitrile, continuously stirring, and fully dissolving to obtain a mixed spinning solution, (3) using a single-nozzle electrostatic spinning needle to perform electrostatic spinning treatment on the mixed spinning solution, wherein the temperature of the electrostatic spinning is 30-50° C, the humidity is 15-40%, the positive voltage is 15-30 kg, the negative voltage is -3 to -1 K, and after spinning, the obtained sample is carbonized to prepare the antimony-bismuth alloy material having a nanofiber structure.