Development and Application of Hard Carbon Anode for Sodium-ion Batteries
Hard carbon has become the most mainstream and mature anode material for commercial sodium-ion batteries, serving as a core component to drive the large-scale industrialization of energy storage batteries. Different from graphite materials widely used in lithium-ion batteries, hard carbon features a disordered porous structure and larger interlayer spacing. The unique structural characteristics effectively adapt to the embedding and extraction of sodium ions, solving the problems of poor sodium storage capacity and unstable cycle performance of traditional carbon materials.
Hard carbon anode presents outstanding practical advantages, including stable sodium storage performance, excellent low-temperature resistance and great rate capability. It adapts well to frequent charge and discharge working conditions. With accessible raw materials such as biomass and coal-based resources, the production cost is significantly lower than that of lithium battery anode materials, making it highly suitable for large-scale energy storage stations, low-speed new energy vehicles and industrial standby power supplies.
The industry keeps optimizing preparation technologies including high-temperature carbonization and surface modification to improve initial Coulomb efficiency and material consistency. As the manufacturing process matures, mass production and commercial application of hard carbon anodes have been fully realized. Driven by the booming energy storage market, hard carbon materials will maintain strong growth momentum in the new energy material industry.
