在Li金属阳极上发现了LiNO3诱导的超薄固体电解质介相形成
Wanxia Li1, Yulin Jie2, Zixu He1
1Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China.
ACS applied materials & interfaces
|May 15, 2025
概括
研究人员研究了金属电池中的固体电解质介面 (SEI). 他们发现了一种超薄的SEI连续形成,其柔软的外层可以溶解,影响电池性能.
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
- 电池技术 电池技术
背景情况:
- 固体电解质界面 (SEI) 对金属电池性能至关重要,影响阳极形态和库伦比效率 (CE).
- 特别是在液体电解质下,SEI的形成和演变机制仍然不太清楚.
研究的目的:
- 为了研究酸 (LiNO3) 诱导的SEI在液体电解质中的形成和演化动态.
- 阐明SEI的现场结构特征和机械性能.
主要方法:
- 使用高分辨率的电化学原子力显微镜 (EC-AFM) 进行操作研究.
- 标志着SEI厚度,层组成和机械性能 (模块).
主要成果:
- 在液体电解质下发现了超厚SEI (∼648nm) 的现场形成,比现场观测明显更厚.
- 确定了一种连续的减少过程:一个富含无机物的内层,然后是柔软的外层 (模量∼24 MPa).
- 观察到外层SEI层具有转移稳定性,容易溶解在液态电解质中.
结论:
- 提供了对LiNO诱导的SEI形成和演变动态的全面的现场理解.
- 强调了SEI转变稳定性和金属阳极在液体电解质中溶解的重要性.
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