2026-10-14T21:11:33Z https://www.scidb.cn/oai

10.57760/sciencedb.17296 2024-11-25T17:43:01Z

2024-11-25 Multilayer polyethylene separator with enhanced thermal properties for safe lithium-ion batteries doi:10.57760/sciencedb.17296 en The separator plays an important part in battery safety and performance. Polyolefin separators are widely used in commercial Lithium-ion batteries (LIBs), owing to their excellent properties, but they suffer from serious thermal shrinkage and poor electrolyte wettability. Thus, a multilayer separator (ASPESA) is developed by coating two thin layers of low-density polyethylene (LDPE) and Al2O3 on both sides of a polyethylene membrane using a facile and environmentally friendly casting technique. The ASPESA separator demonstrates a shutdown function at 120 °C and shows enhanced thermal stability under 185 °C, with a small thermal shrinkage of 1%. Meanwhile, the LDPE and Al2O3 layers can improve the electrolyte wettability and electrolyte uptake (407.23%). The multilayer ASPESA separator delivers an excellent cycle performance in LiFePO4||Li cells with a discharge capacity of 144.5 mAh g−1 after 900 cycles, with a high-capacity retention of 98.9% (compared to the 5th cycle). Therefore, the multilayer ASPESA separator has great utilization potential as a high-safety separator in LIBs. Low-density polyethylene microspheres; Al2O3 particles; Thermal shutdown; High safety; Lithium-ion batteries Haiming Xie Ying Jiang Chen Sun Feilong Dong Liqun Sun PUBLIC https://creativecommons.org/licenses/by/4.0/ dataset http://www.doi.org/https://doi.org/10.1016/j.partic.2023.12.017 Science Data Bank