What are the potential safety hazards of lithium batteries?

Potential safety hazards that may occur in lithium batteries. Safety hazards in the manufacturing process. During the manufacturing process of lithium battery packs, processes such as electrode manufacturing and battery assembly will have an impact on the safety of the battery. The quality control of various processes such as mixing of positive and negative electrodes, coating, rolling, cutting or punching, assembling, filling of electrolyte, sealing, and forming, all affect the performance and safety of the battery. Safety hazards during the use of lithium batteries Lithium battery packs should minimize overcharging or overdischarging during use. Especially for batteries with high single capacity, thermal disturbance may cause a series of exothermic side reactions, leading to safety problem. The safety hazards of the positive electrode material When the lithium battery pack is used improperly, the internal temperature of the battery will increase, which will cause the decomposition of the active material and the oxidation of the electrolyte in the positive electrode material. At the same time, these two reactions can produce a lot of heat, which will cause the battery temperature to rise further. Different delithiation states have very different effects on the lattice transformation of the active material, the decomposition temperature and the thermal stability of the battery. Potential safety hazards of negative electrode materials The negative electrode material used in the early days is metallic lithium. The assembled battery is prone to lithium dendrites after repeated charging and discharging, which will pierce the diaphragm, causing short circuit, leakage and even explosion of the diaphragm and electrolyte. The electrolyte of a lithium battery is a mixed solution of lithium salt and organic solvent. The commercial lithium salt is lithium hexafluorophosphate. This material is prone to thermal decomposition at high temperatures and undergoes thermochemical reactions with trace amounts of water and organic solvents to reduce electrolysis. The thermal stability of the liquid. The organic solvents of the electrolyte are carbonates. Such solvents have a low boiling point and flash point, and are easy to react with lithium salt to release PF5 at high temperatures, and are easy to be oxidized. 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 post: Which of the lithium iron phosphate batteries or lithium cobalt oxide batteries is safe?