Volume 91
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Jiang, Y., Sun, C., Dong, F., Xie, H., & Sun, L. (2024). Multilayer polyethylene separator with enhanced thermal properties for safe lithium-ion batteries. Particuology, 91, 29-37. https://doi.org/10.1016/j.partic.2023.12.017
Multilayer polyethylene separator with enhanced thermal properties for safe lithium-ion batteries
Ying Jiang 1, Chen Sun 1, Feilong Dong, Haiming Xie *, Liqun Sun *
National & Local United Engineering Laboratory for Power Battery, Department of Chemistry, Northeast Normal University, Changchun, 130024, China
10.1016/j.partic.2023.12.017
Volume 91, August 2024, Pages 29-37
Received 28 November 2023, Revised 22 December 2023, Accepted 24 December 2023, Available online 4 January 2024, Version of Record 24 January 2024.
E-mail: xiehm136@nenu.edu.cn; sunlq446@nenu.edu.cn

Highlights

• A multilayer polyethylene-based separator (ASPESA) with high safety was prepared.

• An environmentally friendly and low-cost water-based casting technique is adopted.

• A shutdown function at 120 °C and high thermal stability at 185 °C are acquired.

• The LiFePO4|ASPESA|Li cell delivers superior cycling stability.


Abstract

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.

Graphical abstract
Keywords
Low-density polyethylene microspheres; Al2O3 particles; Thermal shutdown; High safety; Lithium-ion batteries