在ZnPS中诱导水蒸气的超离子导电性
Zachery W B Iton1, Brian C Lee2, Abigail Y Jiang1
1Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, United States.
Journal of the American Chemical Society
|June 9, 2023
概括
通过使 (Zn2+) 和质子 (H+) 离子运输,水蒸气显著提高了ZnPS3电池的导电性. 这一突破增强了固体中的多价离子导电,提高了电池性能.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 下一代电池需要可持续的多价离子 (例如,Mg2+,Ca2+,Zn2+),以提高性能和安全性.
- 了解固态多价离子传输至关重要,但仍然是一个挑战.
- 之前的研究表明Zn2+在绝缘ZnPS3中具有导电性,但导电性较低.
研究的目的:
- 研究水蒸气对ZnPS3的离子导电性的影响.
- 阐明暴露在水中的ZnPS3中的离子运输机制.
- 评估增强多价离子电池材料的潜力.
主要方法:
- 将ZnPS3暴露在不同相对湿度水平下.
- 使用离子选择性电极进行阻抗光谱.
- 离子转移数量测量和Zn金属沉积/剥离.
主要成果:
- 在暴露于水蒸气时,室温导电性增加了数量级 (高达1.44 mS cm-1).
- 已确定Zn2+和H+是移动电荷载体.
- 对导电性的Zn2+贡献是显著的,表明超离子导电.
结论:
- 水吸附可以显著提高ZnPS3等电子绝缘固体中的多价离子导电性.
- 在潮湿环境中区分H+和多价离子对导电性的贡献至关重要.
- 这项研究为开发先进的多价离子电池材料开辟了道路.
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