Composite hard carbon negative electrode material for lithium ion battery and manufacturing method thereof

摘要

A composite hard carbon material of a negative electrode for a lithium ion battery and a method of preparing the same. The composite hard carbon material includes a hard carbon base and a coating outside the hard carbon base, wherein the hard carbon base is formed by pyrolysis of thermoplastic resin or plant material and the coating is formed by pyrolysis of organic substances. The method of preparing the composite hard carbon material includes producing, crushing and coating of the hard carbon base. At 0.2C the composite hard carbon material has a first reversible capacity above 455.2mAh/g and a first charging coulombic efficiency above 79.4%, therefore the composite hard carbon material has a charge and discharge performance of high capacity and high first coulombic efficiency.