▎ 摘　　要

NOVELTY - Preparation method of a potassium ion battery negative electrode material comprises (S1) dissolving nickel acetylacetonate in a solvent to form a uniform first solution; (S2) dispersing graphene into the first solution to form a first turbid solution; (S3) adding dodecyl mercaptan into the first turbid solution, and uniformly mixing to obtain a precursor solution; and (S4) heating, reacting, filtering, washing and drying the precursor solution in sequence. USE - Preparation method of a potassium ion battery negative electrode. ADVANTAGE - Due to the combination of the one-dimensional nickel sulfide nanoparticles and the two-dimensional graphene, the conductivity of the electrode is greatly improved, and the polarization of the electrode in the charge and discharge process can be reduced. The electrode provides potassium ion battery with high capacity, good cycle performance and long service life.