Obtaining a better understanding of activation volumes in ionic conductors

更好地了解离子导体的活化体积

• 批准号: 467585046
• 负责人: Professor Dr. Wolfgang Zeier
• 金额: --
• 依托单位: Institut für Anorganische und Analytische Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/467585046?language=en
• 关键词: Obtaining; better; understanding; activation; volumes

Superionic conductors are materials that provide fast ion conduction similar to liquid electrolytes, and are currently investigated for the use in solid-state batteries. Superionic conductors are usually investigated by temperature – dependent measurements with the goal to assess the activation energies and energetic barriers for the ionic jump. Whereas this approach has been successful in obtaining general characteristics of ion transport, the underlying structural phenomena of an ion jump are not well understood.In contrast, measuring the pressure – dependence of the ionic conductivity leads to another thermodynamic parameter, the activation volume. The activation volume describes how much a structure needs to distort locally to let an ion jump occur. However, while this thermodynamic property is known in general, an in depth understanding and description is missing in how a crystal structure and induced structural changes may affect the activation volume. Therefore, the proposal seeks to obtain a better fundamental understanding of the pressure – dependence of superionic conductors and the interplay between crystal structure and the activation volume.

电子导体是提供类似于液体电解质的快速离子传导的材料，并且目前正在研究用于固态电池中。电子导体通常通过依赖于温度的测量来研究，目的是评估离子跳跃的激活能和能量势垒。尽管这种方法已经成功地获得了离子输运的一般特性，但离子跳跃的基本结构现象还没有得到很好的理解，相反，测量离子电导率的压力依赖性导致另一个热力学参数，激活体积。激活体积描述了结构需要局部扭曲多少才能让离子跳跃发生。 然而，虽然这种热力学性质通常是已知的，但在晶体结构和诱导的结构变化如何影响激活体积方面缺乏深入的理解和描述。因此，该提案旨在获得对超离子导体的压力依赖性以及晶体结构和激活体积之间的相互作用的更好的基本理解。