在同位素标记的固体电解质介相中直接和现场检查Li+运输动力学
Xiaofei Yu1, Stefany Angarita-Gomez2, Yaobin Xu1
1Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354.
概括
固体电解质间相 (SEI) 是电池中的关键. 这项研究表明,SEI中的Li+运输主要使用连续的位移,移动性向电极下降.
科学领域:
- 电池技术 电池技术
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
背景情况:
- 固体电解质介面 (SEI) 对于先进的电池性能至关重要.
- 了解SEI的离子传输和电子泄漏是至关重要的,但有限.
- SEI属性对电池的运行和寿命有很大的影响.
研究的目的:
- 阐明整个SEI的Li+运输机制.
- 量化确定在SEI层内的Li+流动性.
- 为了弥合长达十年的关于SEI动态的知识差距.
主要方法:
- 在现场液态二次离子质谱与同位素标记.
- 低温传递电子显微镜 (cryo-TEM). 低温传递电子显微镜.
- 受到限制的初始分子动力学 (AIMD) 模拟.
主要成果:
- 在SEI中,Li+运输主要是通过连续的移位来发生的.
- 显而易见的Li+自扩散性在空间上从6.7 × 10^-19 m2/s (电解质侧) 减少到1.0 × 10^-20 m2/s (电极侧).
- SEI结构的变化决定了Li+流动性中观察到的梯度.
结论:
- 这项研究提供了对SEI内部Li+动态的直接见解.
- 结果提供了SEI整个离子传输的定量数据.
- 结果指导了SEI化学品的合理设计,以提高电池性能.
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