Silicon-Carbon Anode Material for Higher Initial Efficiency

The patent applies preliminary action by pre-lithiating the silicon anode material before battery assembly. Lithium powder is mixed with silicon material and subjected to ball milling treatment, introducing lithium into the silicon structure in advance. This preliminary lithium supplementation ensures that when the battery operates for the first time, there is sufficient lithium to form the solid electrolyte interface film and accommodate silicon expansion, thereby improving initial efficiency while maintaining high energy density

The patent employs composite materials by creating a composite structure consisting of silicon particles, lithium powder, and carbon coating. The silicon provides high capacity, lithium supplements initial efficiency, and carbon coating stabilizes the structure. This composite approach allows the anode to achieve both high energy density from silicon and improved initial efficiency from lithium, resolving the contradiction between these two parameters

The patent merges the lithium supplementation process with the existing anode material preparation process. Instead of using separate complex supplementation techniques after battery assembly, the patent combines lithium powder mixing and ball milling treatment into the standard anode material fabrication workflow. This integration allows initial efficiency improvement to be achieved during normal production without requiring additional complex equipment or process steps

The patent applies self-service by allowing the anode material to self-regulate lithium distribution through the ball milling process. The mechanical energy from ball milling automatically distributes lithium powder throughout the silicon material and creates appropriate contact interfaces, eliminating the need for external intervention or complex control systems to manage lithium supplementation