How to prevent the safety of lithium iron phosphate batteries?

How to prevent the safety and thermal runaway of lithium iron phosphate batteries? Although the safety of lithium iron phosphate batteries cannot be cured, they are controllable and preventable. Correctly facing and actively exploring some new safety technologies will help promote the progress of battery technology, such as improving the thermal stability of materials/interfaces, and developing units. Self-excitation thermal protection technology and system thermal expansion prevention technology can effectively improve the safety of the lithium iron phosphate battery system. ⒈The thermal decomposition of the surface-coated positive electrode and the oxygen evolution caused by it are important in its reaction with the interface (electrolyte), so we can coat a thermally stable protective layer on the active surface of the positive electrode. For example, after coating a phosphoric acid film or lithium phosphate on the surface of a high-nickel positive electrode, the direct contact between the high-nickel material and the electrolyte can be reduced, thereby reducing the intensity of side reactions and heat generation. Common coating materials include phosphates, oxides, fluorides, and can also be some polymers. ⒉It is not safe to construct a nickel cathode with a high concentration gradient. In addition to its poor thermal stability, it is more important that nickel is very useful for the oxidation and decomposition of the electrolyte, and the material itself does not emit that much heat. After the electrolyte, its heat production temperature and heat production are sharply increased. The reason is that the interface reaction of the electrolyte occupies a large part. If we take high nickel as the core and use some low nickel content materials as the shell, let it have a concentration gradient inside and outside, which will help reduce the reactivity of the material interface and improve the safety of lithium iron phosphate batteries. ⒊Improving the stability of the SEI film adopts some methods to increase the decomposition temperature of the SEI film and improve the thermal stability, which will play a vital role in the safety of the lithium iron phosphate battery. Current research shows that some organic lipids, some organic phosphates, and even some fluorine-containing lithium salts can effectively improve the thermal stability of the negative SEI film and increase its decomposition temperature. 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 reasons for the bulging of the battery?