Carbon fiber has a large aspect ratio, which is conducive to the formation of a conductive network, can improve the bonding firmness between the active materials and the current collector, and act as a physical bonding agent, reducing the amount of bonding agent added. Improve the energy density of the battery. Nano carbon fiber has excellent ability to absorb electrolyte, it is easier to manufacture high-density batteries, and the production efficiency of the battery is improved, and adding a small amount can improve the electrode strength, elasticity and stability. Its special microstructure and small size effect reduce the depth of insertion and extraction of lithium ions, and extend the electrode material and battery life. At the same time, carbon fiber can be used in high-energy density batteries for consumer products, EV batteries with ultra-long life requirements, and energy storage and power batteries that take into account both rate and capacity density.