The application belongs to the technical field of
ion batteries, and particularly relates to a hard carbon negative
electrode material and a preparation method and application thereof. The application provides a preparation method of a hard carbon negative
electrode material, which comprises the following steps: (1) after ball milling treatment and
impurity removal treatment of a
coal-based material, a
coal-based nanomaterial is obtained; (2) after mixing of the
coal-based nanomaterial and an
aliphatic compound containing S and / or N,
spray granulation is performed to obtain a mixed material; (3) the mixed material is first subjected to pre-oxidation treatment, and then subjected to
carbonization treatment under an
inert atmosphere to obtain the hard carbon negative
electrode material. In the application, the coal-based material and the
aliphatic compound are used, and the coal-based material and the
aliphatic compound are polymerized to form a
polymer network composite precursor through
spray granulation and pre-oxidation, and in a high-temperature
carbonization process, graphitization can be inhibited, the hard carbon material has a larger interlayer spacing and a rich closed pore structure, which is beneficial to
ion diffusion dynamics, and the specific capacity, the first efficiency and the cycle life of the hard carbon negative
electrode material are improved.