全固态金属电池混合离子电子导电介层中的动力学
Daxian Cao1, Yuxuan Zhang2, Tongtai Ji1
1Department of Mechanical and Industrial Engineering, Northeastern University, Boston, Massachusetts 02115, United States.
Nano letters
|January 25, 2024
概括
金属阳极是高能电池的关键,但与电解质发生反应. 这项研究揭示了石墨间层如何转变,指导涂层和状岩石在电池运行期间的形成.
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:
- 金属 (Li) 阳极为全固态电池 (ASB) 提供高能量密度.
- 金属和硫化物固态电解质 (SE) 之间的不兼容性阻碍了ASB的发展.
- 混合离子电子导体 (MIEC) 被探索为缓解金属反应性的中间层.
研究的目的:
- 在电池运行期间,研究石墨中间层中的动态,这是一个常见的MIEC.
- 阐明控制Li在Li-石墨交互界面上的Li行为的机械-化学-电化学过程.
- 为了了解Li核化和运输通路在中间层.
主要方法:
- 使用*operando*中子成像以实时可视化Li动态.
- 使用拉曼光谱分析石墨间层的化学和结构变化.
- 执行计算建模以确定核化障碍和运输路径.
主要成果:
- 细胞组装诱导了机械化学反应,将石墨转化为复杂的Li-石墨中间层 (SE,Li0,石墨间隔化合物).
- 在充电过程中,Li+在Li-graphite धूपSE接口上被优先,导致Li0 -dendrite形成和短路.
- 建模确定了接口为核形成的主要地点,决定了运输.
结论:
- 这项研究揭示了MIEC中间层内的复杂机械-化学-电化学过程.
- 离子和金属在中间层中的行为是由竞争因素决定的.
- 了解这些过程对于设计稳定高效的金属ASB至关重要.
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