使用局部电化学,揭示Mg金属电极上原生固体电解质相间层的电子特性
Carla Santana Santos1, Martina Romio2, Yuri Surace2
1Analytical Chemistry - Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum Universitätsstr. 150 D-44780 Bochum Germany wolfgang.schuhmann@rub.de.
Chemical science
|September 22, 2023
概括
扫描电化学显微镜 (SECM) 量化离子电池 (MIB) 中的固体电解质介面 (n-SEI). SECM揭示了电解质选择如何影响n-SEI属性,这对MIB性能至关重要.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子电池 (MIB) 为离子系统提供了一种可持续,安全和经济高效的替代方案.
- 自发电解质分解在Mg阳极上形成固体固体电解质间相 (n-SEI),阻碍电荷转移并限制MIB性能.
- 了解n-SEI属性对于推进MIB技术至关重要.
研究的目的:
- 采用扫描电化学显微镜 (SECM) 来对MIB中的n-SEI电子特性进行局部定量.
- 研究不同电解质配方 (有机酸盐,有机酸盐,基于TFSI) 对n-SEI形成和特征的影响.
- 为了将n-SEI特性与它们的化学组成和形态相关联.
主要方法:
- 使用扫描电化学显微镜 (SECM) 来探测n-SEI的局部电子导电性.
- 通过接触Mg金属与各种电解质溶液 (有机酸盐,有机酸盐,基于TFSI) 形成n-SEI.
- 进行了 ex situ 形态和化学表征 (例如,SEM,EDX) 来补充 SECM 发现.
主要成果:
- 基于TFSI的电解质形成了具有高电子和离子绝缘性能的n-SEI.
- 有机酸电解质导致了低电子保护的n-SEIs.
- 有机酸电解质产生了n-SEI,具有TFSI和有机酸盐之间的中间特性.
- 观察到n-SEI化学成分与其电子/离子导电性之间存在强烈的相关性.
结论:
- 在MIB中,SECM是描述n-SEI的有效工具.
- 电解质选择显著影响n-SEI特性,影响MIB性能.
- 定制电解质成分可以控制n-SEI特性,为改进的MIB铺平道路.
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