Relation of Ionic Conductivity to Solvent Rotation Times in Dinitrile Plastic Crystal Solvents
Relation of Ionic Conductivity to Solvent Rotation Times in Dinitrile Plastic Crystal Solvents
复制标题
二腈塑料晶体溶剂中离子电导率与溶剂旋转时间的关系
DOI：
10.1149/1945-7111/ab847b
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发表时间：
2020
影响因子：
3.9
通讯作者：
Angell, C. Austen
中科院分区：
文献类型：
--
作者：
Davidowski, Stephen;Young-Gonzales, Amanda R.;Richert, Ranko;Yarger, Jeff;Angell, C. Austen
在一篇被广泛引用的论文中，Armand 和同事表明，双三氟甲基磺酰亚胺锂 (LiTFSI) 和其他盐溶解在著名的塑料晶体丁二腈 (CN-CH 2-CH 2-CN) 中，形成高导电性固溶体，他们提出将其作为锂电解质固态电池技术的一种新方法。尽管丁二腈作为分子旋转相已被大量研究，但他们的论文中没有直接提及其重新取向运动。在之前的论文中，我们已经表明，二腈溶剂混合物中磁波动的时间尺度和重新取向弛豫时间（可以在较宽的温度和弛豫时间范围内进行研究）密切相关。在这里，我们利用这一发现来研究 LiTFSI 溶液的电导率弛豫时间与溶剂分子的重新取向时间之间的关系。我们发现，虽然溶剂分子重新取向时间与电导率弛豫时间非常一致，但锂离子处于波动更慢的环境中。不幸的是，这将导致任何电化学装置应用中的浓差极化问题。提出了在保持塑料晶体优势的同时避免此问题的方法。(184)
In a much-cited paper, Armand and coworkers showed that lithium bistrifluoromethyl sulfonylimide (LiTFSI) and other salts dissolve in the well-known plastic crystal, succinonitrile,(CN-CH 2-CH 2-CN) to give a highly conducting solid solution which they proposed as a novel approach to lithium electrolyte solid state battery technology. Although succinonitrile has been much studied as a molecular rotator phase, there was no direct reference made to its reorientational motion in their paper. In a previous paper we have shown that the time scale for magnetic fluctuations and reorientational relaxation times in dinitrile solvent mixtures (which can be studied over wide temperature and relaxation time ranges) are in close correspondence. Here we use this finding to study the relation between conductivity relaxation times of the LiTFSI solutions and the reorientation times of the solvent molecules. We find that, while the solvent molecule reorientation times accord well with the conductivity relaxation time, the lithium ion is in an environment that fluctuates more slowly. Unfortunately, this will lead to concentration polarization problems in any electrochemical device application. Ways to avoid this problem while maintaining the plastic crystal advantage are suggested.(184)
DOI：
10.1063/1.5110404
发表时间：
2019-05
期刊：
The Journal of chemical physics
影响因子：
--
作者：
D. Reuter;P. Lunkenheimer;A. Loidl
通讯作者：
D. Reuter;P. Lunkenheimer;A. Loidl
影响因子：
16.6
作者：
Hayashi, Akitoshi;Noi, Kousuke;Tatsumisago, Masahiro
通讯作者：
Tatsumisago, Masahiro