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固态电池的聚合物电解质中的自扩散:基于同位素标记的ToF-SIMS/ssNMR相关性特征和建模

Thomas Meyer¹, Thibaut Gutel², Hervé Manzanarez²

¹CEA, Liten, DTNM, Université Grenoble Alpes, 38000 Grenoble, France.

ACS applied materials & interfaces

|September 6, 2023

概括

这项研究验证了固态电池的同位素追踪方法. 这些技术准确地测量的分布,有助于开发更安全,高能量密度的金属电池.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
分析化学分析化学

背景情况:

固态电解质通过启用金属阳极,提供更安全,更高能量密度的电池.
了解离子运输对于优化固态金属电池性能至关重要.
同位素追踪是阐明离子运输机制的强大工具.

研究的目的:

为了验证和应用补充技术,飞行时间二次离子质谱 (ToF-SIMS) 和固态核磁共振 (ssNMR) 光谱,用于同位素分析.
描述在聚合物基固态电解质中的自我扩散.
建立强大的方法来分析先进电池材料中的运输.

主要方法:

用不同的6Li同位素丰富剂制备聚乙烯氧化物 (PEO) 膜.
验证ToF-SIMS和6/7Li ssNMR光谱技术,以准确确定同位素的丰度.
应用经过验证的方法与数值模拟相结合,以确定自扩散系数.

主要成果:

来自ToF-SIMS和ssNMR的收结果以高精度 (1-2%的不确定性) 验证了方法.
基于PEO的膜中的自扩散系数在60°C时被确定为1.6 × 10^-12 m^2·s^-1.
该研究成功地通过同位素追踪在聚合物电解质中表征了的自我扩散.

结论:

经过验证的ToF-SIMS和ssNMR是精确分析电池材料中同位素的可靠工具.
已建立的方法为了解固态电解质中的离子运输提供了强大的策略.
这项工作有助于开发更安全,更高效的固态金属电池.

关键词:

离子运输是一种运输方式.同位素交换是同位素的交换.同位素的比率是同位素的比率.追踪可以追踪.聚合物导电传导的方法

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