跳跃率和迁移作为固态电解质中的超离子导电的起源
Xiaona Li1, Honggang Liu2,3, Changtai Zhao4
1Department of Mechanical and Materials Engineering, University of Western Ontario, 1151 Richmond St, London, Ontario N6A 3K7, Canada.
Journal of the American Chemical Society
|May 17, 2023
概括
了解固态电解质中的快速离子导电是先进电池的关键. 这项研究揭示了离子跳跃率,而不仅仅是载体度,显著影响了SSE的导电性.
科学领域:
- 材料科学
- 电化学
- 固态化学
背景情况:
- 无机固态电解质 (SSEs) 对于开发高能固态电池至关重要.
- 目前对SSE中快速离子导电的机制缺乏深入的了解.
研究的目的:
- 澄清影响SSE离子导电性的关键参数.
- 阐明移动载体度,跳跃率和整体离子导电性之间的关系.
主要方法:
- 来自代表性SSE (Li3YCl6,Li3HoCl6,Li6PS5Cl) 和xLiCl-InCl3系统的导电谱的综合分析.
- 缩放分析以分离载体度和跳跃率对离子导电性的影响.
主要成果:
- 移动载体度随温度变化而变化,但并不是导电率变化的唯一驱动因素.
- 离子导电率和离子跳跃率表现出类似的温度依赖性.
- 与离子跳跃期间的格子振动相关的迁移极大地影响了快速的Li+迁移.
结论:
- 在SSE中,快速离子传导由多个相互依赖的变量,包括Li+跳跃频率和迁移能量.
- 在SSE中实现高离子导电性时,跳跃率比载体度更为关键.
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