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斯皮尔斯纪念讲座:气电池 - 追踪功能和故障

Jana B Fritzke¹, James H J Ellison¹, Laurence Brazel¹

¹Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, UK. cpg27@cam.ac.uk.

Faraday discussions

|December 18, 2023

概括

研究人员使用先进的NMR技术来研究空气电池的性能和故障机制. 这项研究有助于克服实际,高能量密度电池应用的挑战.

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:

空气电池 (LAB) 提供了最高的理论能量密度,但面临着重大的商业化挑战.
了解LAB的功能和故障对于开发实用,高性能储能解决方案至关重要.

研究的目的:

用先进的实验技术阐明氧电池的操作机制和故障模式.
识别和描述电解质分解产品及其对电池性能的影响.

主要方法:

利用核磁共振 (NMR) 光谱,包括17O魔形旋转 (MAS) NMR,以量化溶解的氧气和分析电极组成.
使用氧化还原介质来缓解电极堵塞,并通过NMR和电子磁共振 (EPR) 研究它们的机制.
在现场实施的NMR与电化学阻抗光谱学 (EIS) 结合,用于调查电荷传输和识别对称细胞中的短暂短路.

主要成果:

使用NMR量化溶解氧度和扩散率.
在二甲氧乙 (DME) 溶剂中识别了像Li2CO3和LiOH这样的电解质分解产物,并监测了它们在充电期间的去除.
证明了氧电解质中短暂短路的形成,并表明在氧气下形成的固体电解质界面稳定了阳极.

结论:

先进的NMR和EIS技术为空气电池功能和降解途径提供了关键的见解.
了解电解质分解和电荷传输是改善LAB稳定性和循环寿命的关键.
通过保护接口稳定阳极对于实际的空气电池应用是必不可少的.

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