1results about How to "Fast dynamics" patented technology

The application relates to the technical field of batteries, in particular to a negative electrode material, a preparation method thereof and a battery. The negative electrode material comprises a substrate and a carbon coating layer coated on at least part of the surface of the substrate; wherein the substrate comprises hard carbon, the hard carbon is a biomass-based hard carbon material, and the hard carbon contains C elements and O elements, and the atomic ratio of O and C satisfies O:C=1:20-1:10. The preparation method of the negative electrode material comprises the following steps: soaking pretreated biomass material in a chloride solution, sintering to obtain a hard carbon precursor; mixing the hard carbon precursor with an acid solution, adding peroxodisulfate, and after mixing, separating and drying, obtaining a hard carbon material containing an epoxy group; performing carbon coating treatment on the hard carbon material containing the epoxy group to form a carbon coating layer on at least part of the surface of the hard carbon, and obtaining the negative electrode material. The application can improve the capacity and kinetic performance of the negative electrode material, and improve the capacity, initial efficiency and cycle performance of the battery.