The invention relates to the technical field of
coal-based hard carbon negative
electrode materials, discloses a
coal-based hard carbon negative
electrode material as well as a preparation method and application thereof, and solves the problems of relatively low specific capacity and initial coulombic efficiency of the
coal-based hard carbon negative
electrode material. The preparation method of the coal-based hard carbon negative
electrode material comprises the following steps: S1, activating pulverized coal to obtain activated pulverized coal; s2, mixing the activated pulverized coal with nanoscale
thermoplastic resin to obtain a mixture, and performing pre-
carbonization treatment on the mixture; and S3, performing
carbonization treatment on the product in the S2 to obtain the coal-based hard carbon negative
electrode material. The pre-
carbonization treatment comprises the following steps: putting the mixture into a mold, filling
nitrogen into the mold for the first time, heating to a first target temperature, and preserving heat; carrying out first vacuum exhaust and step-by-step mold pressing; and after step-by-step mold pressing is completed, the temperature is increased to a second target temperature, heat preservation is conducted, and then
nitrogen is charged for the second time. The specific capacity and the first coulombic efficiency of the prepared coal-based hard carbon negative
electrode material are remarkably improved.