Lithium-doped rotator phases as ion conducting electrolytes

作为离子导电电解质的锂掺杂旋转相

• 批准号: 429918288
• 负责人: Professor Dr. Roland Böhmer
• 金额: --
• 依托单位: Lehrstuhl für Experimentelle Physik III
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/429918288?language=en
• 关键词: Lithium; doped; rotator; phases; ion

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.

目前的许多研究活动都是为了开发高效的含锂储能材料。这些材料除了具有高导电性外，还应具有良好的机械稳定性。离子掺杂丁二腈基固体电解质在这方面是很有前途的。丁二腈与戊二腈混合晶体中的旋转相丁二腈具有快速重取向分子运动的特征。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液的分子和离子动力学，本项目侧重于磁共振技术的应用：在这里，氚核磁共振非常适合研究晶体基质，而锂核磁共振提供了移动电荷载流子的灵敏探针。通过结合自旋弛豫测量、多维光谱和扩散测量，将阐明分子和离子跃迁过程的相互作用，目的是对高离子电导率的出现以及局域场、关联和缔合效应在固体电解质中的作用获得新的见解。