What are the steps involved in the formation of lithium batteries?

The formation process of iron-lithium battery affects the battery performance. Formation is an important process in the process of iron-lithium battery processing. During formation, a passivation layer is formed on the surface of the negative electrode, that is, the solid electrolyte interface film. The quality of the SEI film affects the battery. The cycle life, stability, self-discharge, safety and other electrochemical properties of the battery meet the requirements of the maintenance-free sealing of the secondary battery. The SEI film formed by different chemical conversion processes is different, and it also has a significant impact on the performance of the lithium battery. Big difference. The traditional low-current precharging method helps to form a stable SEI film, but long-term low-current charging will increase the impedance of the formed SEI film, thereby affecting the rate discharge performance of the lithium battery, and the long process time affects the processing efficiency. Steps of the lithium battery formation process The formation process of the SEI film in the lithium battery formation process specifically includes the following four steps: Step ①: electrons are transferred from the inside of the current collector-conductive agent-graphite particles to point A of the SEI film to be formed; Step ②: The solvated lithium ions diffuse from the positive electrode to point B on the surface of the SEI film being formed under the solvent package; Step ③: The electrons at point A diffuse to point B through the electron tunneling effect; Step ④: Transition to point B The dotted electrons react with lithium salts, solvated lithium ions, film-forming agents, etc., and continue to form an SEI film on the surface of the original SEI film, thereby increasing the thickness of the SEI film on the surface of the graphite particles, and finally forming a complete SEI film. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: How to distinguish polymer batteries?