在分层 (Li-Ag) CrS2中的快速离子导电性
Jing Peng1, Yuhua Liu1, Yu Pan1,2
1Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science & Technology of China, Hefei 230026, P. R. China.
Journal of the American Chemical Society
|September 9, 2020
概括
我们开发了一种新的2D快速离子导体, 这种结构实现了高离子导电性,对于先进的储能装置至关重要.
科学领域:
- 材料科学
- 固态化学
- 电化学
背景情况:
- 快速离子导体对于高性能可充电能量储存至关重要.
- 开发安全和热稳定的固态电解质仍然是一个挑战.
- 二维 (2D) 材料提供了增强离子传输的潜力.
研究的目的:
- 为了引入一个新概念,
- 支柱效应
- ,用于设计2D快速离子 (Li+) 导体.
- 为了研究分层LiAg1-CrS2 (0 < x < 0.4) 的结构和离子传输特性.
- 探索这种新材料系统在储能应用中的潜力.
主要方法:
- 合成不同含量银的分层LiAg1-CrS2材料.
- 结构特征证实了分层结构和Ag+作为支柱的作用.
- 电化学阻抗光谱测量离子导电性和激活能量.
- 用于分析离子迁移机制的温度依赖导电性测量.
主要成果:
- 开发的LiAg1-CrS2结构有效地利用Ag+作为支柱来固离子通道.
- 这种柱状结构促进了多离子协同迁移,导致低激活能量和快速+扩散.
- 在x=0.31时达到19.6mS·cm-1的最大室温离子导电性.
- 观察到一种异常的导电性的反向温度依赖性,这种依赖性归因于竞争的Li+和Ag+迁移.
结论:
- 在
- 支柱效应
- 这一概念成功地实现了2D快速Li+导体的构建.
- 该LiAg1-CrS2系统展示了用于储能的具有竞争力的离子导电性.
- 这项研究为设计基于柱子效应的先进固态电解质开辟了新的途径.
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