在金属阳极上采矿的核化和剥离的演变
Hanrui Zhang1, Mert Ulusel2, Feifei Shi1,2
1John and Willie Leone Family Department of Energy and Mineral Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States.
ACS applied materials & interfaces
|April 25, 2024
概括
了解 (Li) 坑核和生长是稳定的金属电池的关键. 这项研究揭示了Li剥离行为如何取决于电流密度和超电位,改善了电池设计.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 电池技术 电池技术
背景情况:
- (Li) 剥离显著影响金属电池的循环利用性和安全性.
- 矿的核和生长机制,导致不均的剥离,仍然不太了解.
研究的目的:
- 分析Li坑的核化机制和形态演变.
- 阐明坑特征对电流密度和超电位的依赖性.
主要方法:
- 利用共聚焦激光扫描显微镜观察Li坑的演变.
- 在各种条件下分析了大量群体 (>1000个坑) 和电极面积 (>0.45厘米2).
- 量化3D坑道演变,使用循环度和面积比 (R) 等描述符.
主要成果:
- 确认了坑的尺寸和密度与经典核化理论的对齐.
- 观察到特定晶粒的偏好剥离和一种新的中间剥离模式.
- 建立了超潜在和坑半径之间的反向关系,以及与核化速率的指数关系.
结论:
- 已建立的核化-超电位关系有助于预测电极表面积和粗度演变.
- 这项工作为设计金属电池充电/放电配置文件和评估金属提供了洞察力.
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