PITCH-BASED GRAPHITE COMPOSITE MATERIAL, PREPARATION METHOD THEREFOR AND APPLICATION THEREOF

原文（中国語）

A pitch-based graphite composite material, a preparation method therefor and an application thereof are provided. The graphite is coated with pitch gel spheres, and a core-shell composite structure of pitch carbon microsphere coated graphite is obtained through pyrolysis and carbonization, so that the contact between a graphite surface and an electrolyte can be effectively reduced, a stable SEI film can be generated, and the SEI film has good rate and cycle performance. In addition, a porous structure formed by gas generated by pyrolysis and carbonization is beneficial to the transportation of lithium ions, the conductivity and reversible capacity of the material can be significantly improved, the material is more stable in the charging and discharging processes of the lithium-ion battery, the risks of stripping and cracking are effectively reduced, and the cycle stability and the rate capability of the battery are improved.