Battery pulse rating mech2/28/2023 ![]() ![]() In general, these exothermic reactions include: (1) excessive delithiation of cathodes would result in irreversible structure change of cathodes, oxygen release and oxidization of organic solvents (2) lithium dendrites formed on anodes react with electrolytes to generate a large amount of gas, heat and continuous growth of lithium dendrites, which could further penetrate separator and hence result in internal short circuit of batteries (3) the melting of PE-based separators when temperature increases to above 130 ☌, which also leads to internal short circuit (4) the electrolyte is easily decomposed at high temperature (> 200 ☌) and high voltage (about 4.6 V) due to the carbonate organic solvents with low flash points and low boiling points, which will generate large amount of heat. Researchers have paid more attention to the essence of unsafe behavior of LIBs, showing that the exothermic reactions inside batteries are the main reasons. Several burning accidents of portable electronics and EVs have been reported and drawn lots of public attention. Īpart from energy density, safety is another main concern for LIBs widespread application. For instance, Ni-rich materials with a higher Ni content could offer higher capacity, but their thermal stability would be reduced. However, higher-capacity materials tend to show lower thermal stability.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |