通过远红外光谱学和分子动力学模拟探测到溶解盐离子液体中的离子和三相互作用之间的竞争
Jule Kristin Philipp1, Koichi Fumino1, Andreas Appelhagen1
1Universität Rostock, Institut für Chemie, Abteilung für Physikalische Chemie, Albert-Einstein-Str. 27, 18059, Rostock, Germany.
概括
在甘氨酸电解质中的溶解离子液 (SIL) 对离子电池具有前景. 光谱分析揭示了离子如何与和离子相互作用,影响电池性能.
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:
- 基于Glyme的电解质溶液是先进的离子电池的关键.
- 溶解离子液 (SIL) 提供高效率,特别是在二三甲硫) 胺 ([Li][NTf2]) 和甘氨酸的等分混合物中.
- 在Li+离子周围的溶解结构对电解质性能至关重要.
研究的目的:
- 为了研究基质基电解质中的离子的溶解结构和局部环境.
- 了解甘氨酸分子和盐离子之间对离子协调的竞争.
- 为了阐明[Li][NTf2]:G3混合物中纳米结构和离子对 (CIP和SIP) 的形成.
主要方法:
- 远 (FIR) 和中 (MIR) 红外光谱法用于探测溶解.
- 红外光谱分析了Li +,glyme (G3) 和[NTf2]-离子之间的相互作用.
- 分子动力学 (MD) 模拟提供了对电解质混合物的分子层次理解.
主要成果:
- 在低度下,Li+被两个三甲酸分子完全溶解,形成溶剂分离离离子对 (SIP).
- 在较高度下,Li+主要被一个三甲分子 ([Li(triglyme) 1+) 溶解,并与[NTf2]-离子保持接触.
- 该研究发现,从SIP转向混合溶解环境,盐度增加.
结论:
- 电解质中的离子的溶解行为取决于度.
- 了解这些溶解结构对于优化离子电池电解质至关重要.
- 这些发现支持在这些SIL中形成特定的纳米结构和离子配对.
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