Ionically conducting plastic crystals (PCs) are possible candidates for solid-state electrolytes in energy-storage devices. Interestingly, the admixture of larger molecules to the most prominent molecular PC electrolyte, succinonitrile, was shown to drastically enhance its ionic conductivity. Therefore, binary mixtures seem to be a promising way to tune the conductivity of such solid-state electrolytes. However, to elucidate the general mechanisms of ionic charge transport in plastic crystals and the influence of mixing, a much broader database is needed. In the present work, we investigate mixtures of two well-known plastic-crystalline systems, cyclohexanol and cyclooctanol, to which 1 mol. % of Li ions were added. Applying differential scanning calorimetry and dielectric spectroscopy, we present a thorough investigation of the phase behavior and the ionic and dipolar dynamics of this system. All mixtures reveal plastic-crystalline phases with corresponding orientational glass-transitions. Moreover, their conductivity seems to be dominated by the “revolving-door” mechanism, implying a close coupling between the ionic translational and the molecular reorientational dynamics of the surrounding plastic-crystalline matrix. In contrast to succinonitrile-based mixtures, there is no strong variation of this coupling with the mixing ratio.

中文翻译：

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塑性晶体混合物中离子电导率的变化

离子导电塑料晶体（PC）可能是储能设备中固态电解质的候选材料。有趣的是，较大分子与最显着的分子PC电解质丁二腈的混合物显示出可以显着提高其离子电导率。因此，二元混合物似乎是调节此类固态电解质的电导率的一种有前途的方法。但是，为了阐明离子在塑料晶体中传输的一般机理以及混合的影响，需要一个更广泛的数据库。在目前的工作中，我们研究了两种著名的塑料晶体体系的混合物，即环己醇和环辛醇，其混合物为1摩尔。添加％的锂离子。应用差示扫描量热法和介电谱法，我们对这个系统的相行为以及离子和偶极动力学进行了全面的研究。所有混合物均显示出具有相应取向玻璃化转变的塑性晶体相。此外，它们的电导率似乎受“旋转门”机制支配，这意味着周围的塑性晶体基质的离子平移和分子重新排列动力学之间存在紧密耦合。与基于丁二腈的混合物相反，这种混合比例随混合比变化不大。这意味着周围的塑性晶体基质的离子平移和分子重新定向动力学之间存在紧密耦合。与基于丁二腈的混合物相反，这种混合比例随混合比变化不大。这意味着周围的塑性晶体基质的离子平移和分子重新定向动力学之间存在紧密耦合。与基于丁二腈的混合物相反，这种混合比例随混合比变化不大。