一种二元离子凝电解质,用于实现在低温下工作的全固态电气双层电容器
Emmanuel Pameté1, Zhuanpei Wang1, François Béguin1
1Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, Berdychowo 4, 60-965, Poznan, Poland.
ChemSusChem
|May 26, 2024
概括
这项研究引入了用于更安全的电气双层电容器 (EDLC) 的新型二元离子凝膜. 这些离子凝能够在环境下温度下稳定,高性能储能,克服传统电解质的局限性.
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
- 固态电解质是一种固态电解质.
背景情况:
- 有机电解质的经典电气双层电容器 (EDLC) 面临安全问题,因为在高温下泄漏.
- 离子凝,离子液体被限制在固体矩阵中,提供了更好的安全性,但由于离子液体的高点,它们在低温性能方面遇到了困难.
- 现有的来自单离子液体的离子凝具有限制其操作温度范围的点.
研究的目的:
- 为固态EDLC开发一种新的离子凝电解质,以提高低温性能和安全性.
- 为了研究二元离子液体混合物对离子凝的热和电化学性能的影响.
- 为了证明在极端环境中运行EDLC中使用这些二进制离子凝的可行性.
主要方法:
- 在无氧/无湿条件下,通过将70%重量%的[EMIm][BF4]和[EMIm][FSI]混合物封装到PVdF-HFP聚合物矩阵中,制备二元离子凝薄膜.
- 离子凝的离子导电性,热特性 (玻璃过渡,点) 和灵活性的表征.
- 使用二元离子凝分离器和层次的微/半孔碳电极制造和测试层状EDLC.
主要成果:
- 二元离子凝膜具有高灵活性和良好的离子导电性 (20°C时5.8mS/cm).
- 封闭的二元离子液体的结晶被灭,在-101°C时只显示玻璃过渡,与父离子凝不同.
- 带有二元离子凝分离器的EDLC从-40°C到室温运行高达3.0V,与液态电解质的电池相比,在低温下表现出显著更高的特定能量.
结论:
- 开发的二元离子凝电解质有效抑制离子液晶化,使其具有优越的低温离子导电性和EDLC性能.
- 这种方法为创建安全,灵活,固态能量存储设备提供了一条途径,能够在极端的环境下温度条件下运行.
- 二元离子凝概念解决了当前用于苛刻应用的储能技术的关键局限性.
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