在离子电解质中对同位体TFSI和FPFSI离子进行比较研究,使用量子化学和Ab Initio分子动力学
Piotr Kubisiak1, Domantas Narkevičius1,2, Chiara Nicotri1,3
1Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland.
The journal of physical chemistry. B
|February 19, 2025
概括
该研究比较了用于离子电解质的TFSI和FPFSI离子. FPFSI显示出更复杂的结构和增加的阴离子-溶剂协调,S-F振动对于监测相互作用是有用的.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学计算化学
- 电化学 电化学 电化学
背景情况:
- 离子电池依赖于具有高离子导电性的电解质.
- 双三甲基硫尼尔) 胺 (TFSI) 和其化模拟物,双五甲基硫尼尔) 胺 (FPFSI) 是高级电解质中的关键离子.
- 了解离子结构和溶解对于优化电解质性能至关重要.
研究的目的:
- 为了比较TFSI和FPFSI离子在离子导电电解质中的结构和动态特性.
- 为了研究阴离子结构对阴离子协调和溶解的影响.
- 为了确定用于监测电解质中的离子-相互作用的光谱标记物.
主要方法:
- 量子化学计算以确定离子对应物和离子复杂几何.
- 在四石中对LiFPFSI盐溶液的初始分子动力学模拟.
- 对离子,离子对和电解质的振动和红外光谱的分析.
主要成果:
- 与TFSI相比,FPFSI表现出更多的低能适配器和更多种类的离子复杂结构.
- 首选的离子协调是两离子通过氧原子的双,FPFSI的结合略弱.
- FPFSI电解质显示了离子-溶剂协调的增加,以及FPFSI的明显S-F拉伸振动.
结论:
- FPFSI的不对称性影响其复合行为和离子电解质中的溶解动力学.
- 在600厘米以上的FPFSI的S-F拉伸振动-1 作为一个潜在的实验探测器为FPFSI-Li相互作用.
- 这些发现有助于合理设计新的离子导电解质.
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