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使用操作扫描电子显微镜绘制固体电解质接口的演变图像

Lihong Zhao¹, Min Feng², Chaoshan Wu^1,3

¹Department of Electrical and Computer Engineering and Texas Center for Superconductivity at the University of Houston, University of Houston, Houston, TX, USA.

Nature communications

|May 9, 2025

概括

固体电解质接口质量是固态电池的关键. 操作显微镜显示,Li-Mg合金形成的空隙比Li少,使得在低压下稳定循环.

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:

固体电解质接口 (SEI) 质量对于固态金属电池的性能至关重要,特别是在低堆压力下.
由于缺乏操作特征化技术,对电池运行期间的SEI动态的理解受到限制.

研究的目的:

用操作技术研究高空间分辨率的电解质接口的演变.
为了比较金属阳极和合金阳极在剥离过程中的界面行为.
阐明金属阳极中高超电位的起源,并实现稳定的电池循环.

主要方法:

在现实的操作条件下操作扫描电子显微镜 (SEM).
追踪 (Li) 和丰富的Li-Mg合金阳极的剥离过程.
密度函数理论 (DFT) 的计算.
在Li和Li-Mg剥离过程中分析压力依赖的电压配置.

主要成果:

运行SEM显示了Li阳极的空隙凝聚和接口分层,与Li-Mg阳极的空隙分裂和部分回收形成对比.
DFT计算表明,在Li-Mg阳极中更强的Mg-S相互作用通过吸引Mg和排斥Li空隙来减少空隙.
由于空隙形成而失去界面接触,而不是Mg积累,被确定为高超电位的首要原因.

结论:

通过Li-Mg合金阳极促进的改进的接口接触,使所有固态全细胞在低堆压力 (1MPa) 和中等速率 (2mA cm-2) 的稳定循环.
电解质接口动态的实时可视化为设计先进的固态电池接口提供了关键的见解.

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