Method for preparing hard carbon material by pre-crushing asphalt and application of hard carbon material

The invention relates to a method for preparing a hard carbon material by pre-crushing asphalt and application of the hard carbon material. According to the technical scheme of the invention, before conventional crushing and carbonization of asphalt, pre-crushing treatment is carried out in a QS-100 small jet mill, the crushing pressure is 0.8 Mpa, the feeding pressure is set to 0.8 Mpa, the pre-crushing treatment and acrylamide are ground and mixed according to the mass ratio of 7: 1 in the subsequent grinding treatment, acrylamide plays a role in constructing macromolecules, and the high molecular weight of the asphalt is increased; meanwhile, an oxygen-containing functional group is introduced, so that the yield of hard carbon is favorably improved. The first specific discharge capacity of the hard carbon material prepared by the method disclosed by the invention can reach 308.98 mAh/g; the coulombic efficiency of the first circle reaches 87.65%, and the specific capacity is kept at 86% after 100 circles o