Synthesis method of boron-doped carbon-coated graphite

The invention discloses a synthesis method of boron-doped carbon-coated graphite, and relates to the technical field of lithium ion battery preparation, B2H6 and CO2 are deposited on the surface of a graphite material in a chemical vapor deposition form in a vapor deposition furnace by utilizing a chemical reaction of B2H6 and CO2 to form a boron-doped carbon-coated graphite material. B2H6 reacts with CO2 to generate carbon, a B-C bond and H2O to form boron-doped carbon, a graphite base material serves as an inner layer, the boron-doped carbon serves as an outer layer, the electronic structure state of the carbon layer is changed through boron doping, the charge storage and transmission rate is increased, the electrochemical performance is optimized, and due to introduction of boron doping and crystal structure defects, transmission of lithium ions is better facilitated. And the gas-phase coating mode avoids the phenomena of nonuniformity of solid-phase doping and local agglomeration. And the gas phase reacti