在Li-S电池中的硫规格通过实验室X射线发射光谱操作确定
Ava Rajh1,2, Alen Vizintin3, Joanna Hoszowska4
1Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia.
ACS applied energy materials
|December 13, 2024
概括
本研究介绍了一种基于实验室的X射线发射光谱法,用于分析硫 (Li-S) 电池阴极. 它在电池运行过程中跟踪硫种和氧化状态,为同步仪方法提供了切实可行的替代方案.
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
- 频谱学是一种光谱学.
背景情况:
- 硫 (Li-S) 电池对高能量密度存储具有前景.
- 了解循环期间的硫特异和氧化状态对于Li-S电池的性能至关重要.
- 基于同步离子的X射线吸收光谱法是常用的,但有局限性.
研究的目的:
- 开发和验证基于实验室的X射线发射光谱 (XES) 设置,用于运行分析Li-S电池阴极.
- 在电池循环过程中,确定平均硫氧化状态并描述阴极内的不同硫种.
- 为Li-S电池研究提供更容易获得和更常规的分析方法.
主要方法:
- 运行硫KβX射线发射光谱 (XES) 测量使用实验室X射线管和·哈莫斯光谱仪进行.
- 从Li-S电池阴极记录了ex situ和operando S Kβ的辐射光谱.
- 硫氧化状态由光谱形状来确定,硫种通过标准的线性组合来量化.
主要成果:
- 实验室XES设置实现了卓越的能量分辨率和检测效率.
- 在Li-S电池循环过程中,成功确定了平均硫氧化状态和阴极中不同硫种的相对量.
- 该方法适用于与真实电池相关的硫载荷的缩样本.
结论:
- 基于实验室操作的硫XES是一种可行的,强大的替代方案,用于基于同步仪的方法,用于Li-S电池分析.
- 这项技术使Li-S和其他基于硫的系统中电化学过程的常规实验室分析成为可能.
- 这些发现有助于更深入地了解Li-S电池的降解和优化.
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