How to improve the safety of batteries?

Improving the safety of batteries should start from the following aspects: the common positive electrode material is stable when the temperature is lower than 650℃, and is in a meta-stable state during charging, and the following reactions occur when the temperature rises. The released oxygen will oxidize the solvent: Is there an exact statement about whether the positive electrode reacts directly with the electrolyte or after the oxygen is released? Electrolyte Lithium battery electrolyte is basically an organic carbonate type substance, which is a kind of flammable substance. Commonly used electrolyte salt lithium hexafluorophosphate has a thermal decomposition reaction. Therefore, improving the safety of the electrolyte is very important to the safety control of power lithium batteries. The thermal stability of LiPF6 is an important factor affecting the thermal stability of the electrolyte. Therefore, the current important improvement method is to use a lithium salt with better thermal stability. However, since the reaction heat of the decomposition of the electrolyte itself is very small, the impact on the safety performance of the battery is very limited. What has a greater impact on battery safety is its flammability. The important way to reduce the flammability of the electrolyte is to use flame retardant additives. Separator Currently, there are three important types of commercially available lithium battery separators, namely PP/PE/PP multilayer composite microporous film, PP or PE single-layer microporous film and coating film. The widely used diaphragm is mainly a polyolefin microporous membrane, which has a stable chemical structure, excellent mechanical strength, and good electrochemical stability. 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 factors will shorten the life of lithium batteries?