Ion Vacancies and Transport in 1-Methylimidazolium Triflate Organic Ionic Plastic Crystal.,The Journal of Physical Chemistry Letters

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Ion Vacancies and Transport in 1-Methylimidazolium Triflate Organic Ionic Plastic Crystal.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-01-07 , DOI: 10.1021/acs.jpclett.9b03823
Haijin Zhu _{1,

2} , Maria Forsyth _{1,

2}

Affiliation

Organic ionic plastic crystals (OIPCs) are an important family of materials that have shown exciting possibilities as solid electrolytes for lithium ion batteries and other electrochemical devices. In this study we demonstrate for the first time that, although the X-ray shows sharp diffraction peaks, both cation and anion clearly exhibit significant ion diffusion in solid phase I. Two phases with ion diffusivities differing by 2 orders of magnitude can be identified. The populations of the cation and anion in both phases are found to be unequal, hinting at the existence of (negatively charged) cation vacancies in the plastic crystal phase and a positively charged grain boundary phase. These interesting properties of ion vacancies and unequal populations of cation and anion are likely to be ubiquitous in other OIPCs, and it is of paramount importance to be aware of these features to correctly understand the structure-property relationships of this important material family.

中文翻译：

1-甲基咪唑三氟甲磺酸盐有机离子塑料晶体中的离子空位和传输。

有机离子塑料晶体（OIPC）是重要的材料家族，已显示出令人振奋的可能性，可作为锂离子电池和其他电化学装置的固体电解质。在这项研究中，我们首次证明，尽管X射线显示出尖锐的衍射峰，但阳离子和阴离子都明显在固相I中显示出明显的离子扩散。可以鉴定出离子扩散度相差2个数量级的两个相。发现两个相中的阳离子和阴离子的数量不相等，这暗示在塑性晶体相和带正电的晶界相中存在（带负电的）阳离子空位。在其他OIPC中，离子空位和不相等的阳离子和阴离子种群的这些有趣特性很可能普遍存在，

更新日期：2020-01-07

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