矩阵辅助激光吸附离子化质谱:一种有效的方法来监测离子电池电解质降解,同时保持分析物的完整性
Théo Sombret1,2,3,4, Egon Kherchiche1,2,3,4, Marie Hubert-Roux1,4
1Université de Rouen Normandie, INSA Rouen Normandie, Université de Caen Normandie, ENSICAEN, CNRS, Institut CARMeN UMR 6064, F-76821 Mont-Saint-Aignan Cedex, France.
概括
矩阵辅助激光消耗电离化高分辨率质谱仪 (MALDI-HRMS) 有效地分析离子电池电解质. 固态电解质在24小时暴露在空气中后没有降解,与液态电解质不同.
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
- 分析化学 分析化学
背景情况:
- 了解离子电池 (LIB) 衰老需要描述电极-电解质接口和电解质组成.
- 对LIB组件的分子表征至关重要,但由于样本的不稳定性,特别是存在水分,因此具有挑战性.
- 目前的分析方法通常需要在受控大气层中处理样品,在传输过程中存在降解风险.
研究的目的:
- 为了评估用于分析LIB电解质的矩阵辅助激光吸附离子化高分辨率质谱法 (MALDI-HRMS).
- 评估LIB电解质在液体和固体状态下暴露在空气中的稳定性.
- 确定MALDI-HRMS适用于监测电解质降解的适用性.
主要方法:
- 在EC/EMC溶剂中使用MALDI-HRMS分析含有LiPF6,LiFSI,LiDFOB和LiPO2F2的电解质.
- 液体和固态电解质暴露在空气中以诱导衰老.
- 在暴露于空气后使用MALDI-HRMS监测电解质降解.
主要成果:
- 马尔迪-HRMS能够严格监测暴露在空气中的电解质降解.
- 固态电解质在24小时暴露在空气中没有出现任何降解.
- 液态电解质在暴露于空气后30分钟内就会降解.
结论:
- 固态电解质在转移到质谱仪时保持分子完整性.
- MALDI-HRMS是研究离子电池电解质降解的相关技术.
- 固态方法为样本分析和稳定性提供了显著的优势.
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