Biomass carbon negative electrode material for sodium ion battery as well as preparation method and application of biomass carbon negative electrode material

The biomass carbon negative electrode material for the sodium-ion battery with excellent sodium storage performance is prepared through simple repeated calcination, asphalt coating and carbonization treatment processes, is a biomass hard carbon material synthesis process which is low in cost, easy to synthesize, green and environment-friendly and takes tea seed shells and asphalt as raw materials, and has the advantages of being easy to operate, high in repeatability, high in sodium storage performance and the like. The biomass carbon negative electrode material has the characteristics of simple preparation process, extensibility and low cost, and the obtained biomass carbon negative electrode material for the sodium ion battery has rich pore structures and proper interlayer spacing and shows excellent electrochemical performance. According to the biomass carbon negative electrode material for the sodium ion battery prepared in the embodiment 3, the initial charging capacity is 310.5 mAh g , the initial