用盐中的水电解质形成的液体/液体接口的极化诱导破裂
Lihao Feng1, Michael Goldstein1, Yang Wang1
1Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States.
Journal of the American Chemical Society
|May 29, 2025
概括
具有离子聚合物的盐水电解质 (WiSE) 在液体/液体接口上表现出独特的离子转移特性. 这些聚合物可以在极化时突破接口,挑战超缩溶液中离子传输的当前模型.
科学领域:
- 电化学
- 物理化学
- 材料科学
背景情况:
- 盐中的水电解质 (WiSE) 由于盐度高,具有独特的特性,影响其化学和物理行为.
- 在WiSE中形成的离子聚合物,特别是TFSI离子,改变了电化学接口的反应性,有利于电池的性能.
- 关于WiSE溶解结构如何影响电化学界面上的离子转移的理解有限.
研究的目的:
- 使用液态LiCl和LiTFSI溶液对液体/液体接口的离子转移进行研究.
- 阐明WiSE溶解结构和离子聚合物的离子转移能量的作用.
- 将WiSE中的离子转移行为与可极化和不可极化接口的经典模型进行比较.
主要方法:
- 在微界面上使用电化学测量.
- 采用了分子动力学 (MD) 的模拟.
- 在液体/液体界面上研究了Li+,Cl和TFSI-离子的离子转移能量.
主要成果:
- 尽管形成离子对,但 LiCl 度的增加对离子转移能量产生了极小的影响.
- 高度的LiTFSI形成了离子聚合物,导致具有~8-10kcal/mol的能量屏障的独特离子转移行为.
- 离子聚合物在极化时突破了液体/液体接口,导致局部混合.
结论:
- 液体/液体界面上的离子转移受到离子聚合物形成的显著影响.
- 聚合物所观察到的界面破裂需要重新评估超缩电解质中的离子转移机制.
- 这些发现影响了对电化学系统的界面的理解,包括没有膜的设计.
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