The Role of Separator Thermal Stability in Safety Characteristics of Lithium-ion Batteries

The thermal instability of polymer separators severely threatens the safety characteristics lithium-ion (Li-ion) batteries. Separators will melt, shrink, vaporize, and collapse under high temperatures, leading to internal short circuits runaway catastrophes cell. Therefore, amelioration battery challenges benefits from a fundamental understanding separator behaviors thermally abusive scenarios. This work investigates role stability in modulating Li-ion cell performance. Three types made commercially available cellulose, trilayer polypropylene/polyethylene/polypropylene, standard polypropylene, an in-house modified graphene-polydopamine coated are fabricated custom single layer pouch cells subjected accelerating rate calorimeter (ARC) tests investigate dynamic thermo-electrochemical interactions. hazards 18650 cylindrical assembled with different predicted using verified ARC computational model compare effects heat resistance on cell-level risks. study reveals robust mechanisms diverse microstructures, indicating how significantly enhances limits