▎ 摘　　要

NOVELTY - Preparation of high-capacity and high-density graphite composite material involves uniformly mixing graphite precursor, conductive agent, lithium borate and coating material in a mass ratio of 100:1-5:1-5:10-30, to obtain mixture (A), adding the mixture (A) to a tube furnace in an inert atmosphere, heating to 300-500degrees Celsius for thermal polymerization, introducing modified gas, reacting for 1-12 hours under pressure at 0.1-10 MPa, naturally cooling the reaction solution to room temperature, crushing to obtain mixed material (B), uniformly mixing the material (B), binder and catalyst in a mass ratio of 100:10-30:1-5, performing low-temperature composite granulation process at 500-800degrees Celsius under the protection of inert atmosphere, crushing, grading to obtain a mixed material (C), and subjecting the material (C) to high-temperature graphitization treatment at 2800-3200degrees Celsius. USE - Preparation of high-capacity and high-density graphite composite material used as cathode material of lithium-ion battery. ADVANTAGE - The method uses lithium borate itself with bonding effect for secondary granulation and containing sufficient lithium ion to reduce the irreversible capacity and improve the first efficiency of the material; at the same time, using the electronic conductivity of the conductive agent, improving the cathode material activity to improve its specific capacity, and the prepared graphite composite material has high specific capacity, the compaction density is high, the efficiency is high and the low temperature performance is excellent.