How to improve the safety performance of lithium batteries?

How to improve the safety performance indicators of lithium batteries The safety of lithium batteries has always been the focus of consumers. Although the safety of lithium batteries cannot be cured, it is to prevent control, face correctly and actively explore some new safety techniques, which will help accelerate the battery. Advances in technology, improved interface thermal stability data, the development of self-excited heat maintenance skills for monomers, and system thermal expansion guard skills can effectively improve the safety of the battery system. One: Outer cover. The thermal differentiation of the positive electrode and the precipitation of oxygen are important due to its reaction with the interface (electrolyte), so we can coat the active surface of the positive electrode with a thermally stable maintenance layer. For example, coating a phosphating film on the surface of a high-nickel positive electrode may reduce the direct contact between the high-nickel data and the electrolyte in the future, thereby reducing the intensity of side reactions and heat generation. Commonly used coating materials include phosphates, oxides, fluorides and some polymers. Two: Establish a concentration gradient. High nickel anode is unsafe. In addition to its poor thermal stability, it is more important that the electrolyte has a strong nickel oxide differentiation effect, and its heat is not too large, but as the electrolyte is in the future, it The temperature at which heat appears and the rapid progress of heat appears because the electrolyte interface reaction accounts for a large part. If we take high nickel as the core and use some data with low nickel content as the outer shell, so that there is a concentration gradient inside and outside, which will help reduce the echo activity of the data interface and improve the safety of the battery. Three: Improve the stability of SEI film. As mentioned above, thermal failure usually begins with the differentiation of the negative SEI film. If we choose some methods to improve the differentiation temperature and thermal stability of the SEI film, it will play a vital role in the safety of lithium batteries. Current studies have shown that some organic lipids, some organic phosphates, and even some lithium fluoride have certain uses for improving the thermal stability of the negative SEI film and increasing its differentiation temperature. Four: Set monomer self-excited heat maintenance. The working principle of this technology is to use temperature-sensitive data to block the transmission of electrons or ions on the electrodes at dangerous temperatures, and even seal the battery's response, and then stop heating. For example, PTC data will change from a good conductive state to an insulated state, blocking the circuit as the temperature increases. Using PTC data as a coating for polar fluids, or as a conductive agent for electrodes, or as a surface modification layer for active materials, can realize self-heating maintenance of single cells. Similarly, there is a kind of microsphere to refute this gap. When the temperature rises, the microspheres will melt and the holes in the crevices will close the battery. Now, it is also the focus of all battery companies and OEMs to ensure the safety of power lithium-ion batteries through the structural design of the battery system. At the same time, improving the test intensity of power lithium-ion batteries is the key to further ensuring battery safety. Wang Fang, the chief expert of the my country Automotive Technology Research Center, also put forward the mandatory safety requirements for electric vehicle batteries published on the Internet by the Ministry of Industry and Information Technology at the Power Lithium-ion Battery Technology Summit on January 10. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the advantages of industrial lithium batteries?