多层聚乙烯分离器,增强离子电池的热和电化学性能
Jingju Liu1, Baohui Chen1, Jiarui Liu1
1State Key Laboratory of Disaster Prevention & Reduction for Power Grid, State Grid Hunan Electric Company Limited Disaster Prevention and Reduction Center, Changsha 410007, China.
Materials (Basel, Switzerland)
|January 28, 2026
概括
这项研究引入了离子电池 (LIB) 的新型多层分离器,提高了安全性和性能. SAPEAS 分离器提供了更好的热稳定性和机械强度,防止热失控.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 电池技术 电池技术
背景情况:
- 离子电池 (LIB) 中常规的聚烯烯分离器具有不良的热稳定性和机械强度,导致热失控等安全风险.
- 提高分离器性能对于提高LIB安全性和性能至关重要.
研究的目的:
- 开发一种新的多层分离器,SAPEAS,以改善LIBs中的热关闭和维度稳定性.
- 评估SAPEAS分离器所提供的电化学性能和安全增强.
主要方法:
- 一种可扩展的微蚀刻工艺被用来连续地涂覆聚乙烯 (PE) 基板,用氧化 (Al2O3),准胺 (PA) 和聚乙烯微球 (PEWM).
- 开发的SAPEAS分离器具有热关闭,尺寸稳定性,机械强度,电解质可湿性,离子导电性和Li+转移数等特点.
- 性能在LFP水Gr袋式电池中得到验证,评估了循环稳定性和过载耐受性.
主要成果:
- SAPEAS分离器在105°C时显示过早的热关闭,在180°C时显示微不足道的收缩.
- 它表现出增强的机械强度 (拉力强度:212.3 MPa;穿孔强度:0.64 kgf),优异的电解质可湿性 (接触角度:12.8°),高的Li+转移数 (0.71),以及优异的离子导电率 (0.462 mS cm-1).
- 与商业PE分离器相比,SAPEAS能够在1000个循环后保持97.9%的能量,并提高了超负荷耐受性.
结论:
- SAPEAS 分离器有效地解决了传统分离器的局限性,显著提高了LIBs的安全性和电化学性能.
- 这种多层涂层策略为开发下一代LIB隔离器提供了一种可行的方法.
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