Lithium-doped rotator phases as ion conducting electrolytes

目前许多研究活动旨在开发高效的含锂储能材料。除了高导电性外，这些材料还应具有良好的机械稳定性。离子掺杂琥珀腈基固态电解质在这方面很有前途。旋转相丁二腈与戊二腈混合晶体具有快速重定向分子运动的特点。到目前为止，在这些系统中，旋转-平移-耦合及其偏差主要是用阻抗谱来检测的。为了在微观水平上阐明这些电解质的分子和离子动力学，该项目侧重于磁共振技术的应用：在这里，氘核磁共振非常适合研究晶体基质，锂核磁共振提供了移动电荷载流子的敏感探针。通过结合自旋弛豫测量、多维光谱和扩散测量，分子和离子跳跃过程的相互作用将被阐明，目的是获得对高离子电导率的出现以及局部场、相关和关联效应在固体电解质中的作用的新见解。

Numerous current research activities aim at developing efficient Lithium containing energy storage materials. In addition to a high electrical conductivity these materials should feature good mechanical stability. Ionically doped succinonitrile-based solid-state electrolytes are promising in this respect. The rotator phase succinonitrile, in mixed crystals with glutaronitrile, is characterized by fast reorientational molecular motions. So far, in these systems the rotation-translation-coupling and deviations thereof were examined mostly using impedance spectroscopy. To elucidate the molecular and ionic dynamics of these electrolytes on a microscopic level, this project focuses on the application of magnetic resonance techniques: Here, deuteron NMR is well suited to investigate the crystalline matrix and lithium NMR provides a sensitive probe of the mobile charge carriers. By combining spin relaxometry, multidimensional spectroscopy, and diffusometry, the interplay of molecular and ionic jump processes will be elucidated with the goal to gain new insights into the emergence of high ionic conductivities as well as into the role of local-field, correlation, and association effects in solid electrolytes.