Natural graphite is the metamorphism of organic carbon at high temperature, is steel gray, black gray, with semi-metallic luster, crystal structure belongs to hexagonal crystal system, hexagonal layered structure, with high temperature resistance, heat conduction, electricity, lubrication, plastic and corrosion resistance.Graphite is an early anode material. Compared with other carbon materials, it has higher conductivity and crystallinity, good layered structure and charge-discharge voltage, which is also very suitable for the deactivation/embedding of cathode materials. At present, the technology is mature and the cost is low, so it is a relatively ideal anode material.