在有孔材料中以离子液体为基础的电解质中,限制增强的Li+离子动力学
Janis Hessling1, Martin Lange2, Monika Schönhoff1
1Institute of Physical Chemistry, University of Münster, Corrensstraße 28/30, D-48149 Münster, Germany. schoenho@uni-muenster.de.
Physical chemistry chemical physics : PCCP
|August 30, 2023
概括
离子液体 (ILs) 在纳米孔状材料中的封闭会影响离子电池电解质. 虽然二氧化封闭阻碍了Li+动态,但ZIF-8 MOF通过打破Li-TFSA集群来增强它,显示对离子运输的接口效应.
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
- 物理化学 物理化学
背景情况:
- 离子液体 (ILs) 为离子电池提供稳定的电解质,但由于离子聚合,它们遭受Li+运输不良的影响.
- 纳米孔状材料中的限制可以改变IL的特性,从而有可能改善离子运输.
研究的目的:
- 为了研究被封闭在半孔二氧化 (SBA-15) 和金属有机框架 (ZIF-8) 对Li+动态和离子聚合在IL电解质中的影响.
- 了解孔径大小和材料接口如何影响Li+协调和移动性.
主要方法:
- 利用拉曼光谱分析离子协调和离子壁相互作用.
- 采用温度依赖的7Li旋转放松率 (通过Bloembergen,Purcell和Pound模型分析) 来探测Li+动态和局部环境.
主要成果:
- 在SBA-15 (8nm和4nm孔) 中封闭并没有改变Li+协调或破坏Li-TFSA集群,并降低了Li+动态.
- 在ZIF-8 (1.16纳米孔) 中的限制令人惊地增强了Li+的局部动态和不对称性,与减少的Li+-TFSA协调相关,并表明集群破裂.
- 差异归因于毛孔壁相互作用:TFSA-与SBA-15和Pyr14+与ZIF-8.8的相互作用.
结论:
- 纳米孔隙材料接口显著影响IL结构和离子动态.
- 通过破坏离子集群,ZIF-8封闭显示了克服IL电解质中Li+运输差的潜力.
- 定制毛孔表面化学提供了一种优化先进电池电解质中的离子动态的策略.
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