离子导电性和共同溶剂调制水结构和动态之间的相关性在水性Zn-离子电池电解质中
Sudipta Mitra1, Ranjit Biswas1
1Department of Chemical & Biological Sciences, S.N. Bose National Centre for Basic Sciences, Block-JD, Sector-3, Salt Lake, Kolkata 700106, India.
The Journal of chemical physics
|October 22, 2025
概括
将四甲基尿素 (TMU) 添加到水性离子电池电解质中,可以改善Zn2+运输. TMU在Zn2+离子周围增强了水-水键,与导电性正相关,并使有效的离子运动成为可能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 水性离子电池 (AZIB) 是一个有前途的储能设备.
- -树突石的形成和阳极腐蚀阻碍了AZIB的性能.
- 共同溶剂可以修改电解质特性以减轻这些问题.
研究的目的:
- 研究辅溶剂对水结构和围绕Zn2+离子的动态的影响.
- 在AZIB电解质中将改变的水溶解与离子导电性相关联.
- 了解四甲基尿素 (TMU) 在AZIB电解质性能中的作用.
主要方法:
- 利用分子动力学模拟用于具有不同TMU组成的实验AZIB系统.
- 通过Onsager运输系数分析了离子导电性.
- 检查了水-水键网络,寿命和围绕Zn2+离子的停留时间.
主要成果:
- 2+离子显著扰乱水-水键网络和定向结构.
- TMU的存在增加了水分子溶解 Zn2+ 的停留时间和键寿命.
- 观察到水-水 H 键和导电性之间的正相关性;与 H 键寿命和水停留时间的反相关性.
结论:
- 在Zn2+离子周围的水-水H键对于AZIB中的Zn2+运输至关重要.
- 使用TMU增加水-水H键寿命和停留时间,支持车辆运输机制.
- 微观洞察力解释了TMU的作用和AZIBs中离子导电性的粘度依赖.
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