通过酸性处理对表面的修改及其对和剥离的影响
Fatemehsadat Rahide1, Krishnaveni Palanisamy2, Jackson K Flowers3,4
1Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
ChemSusChem
|October 23, 2023
概括
片的不闪亮的一面,具有更高的粗度,增强了电池中的板/脱落. 预处理创建一个相间层,提高性能,但导致循环后腐蚀.
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:
- 在 (Al) 基板上的无形氧化 (Al2O3) 阻碍了可充电电池的性能,阻碍了Al/剥离.
- 合金薄膜表现出明显的光亮和不光亮的表面,其特性和电化学行为存在尚未探索的差异.
研究的目的:
- 为了研究闪亮和非闪亮的Al片侧面的表面特性.
- 评估沉浸在离子液体电解质中的预处理对Al阳极性能的影响.
- 了解在循环过程中化/剥离和降解的机制.
主要方法:
- 片侧面的表面特征 (粗度,微观结构).
- 电化学测试Al/剥离与不同的预处理持续时间.
- 分析电极-电解质间相 (EEI) 的组成和结构.
- 对Al阳极形态和机械性能进行循环后分析.
主要成果:
- 不光亮的Al片侧面表现出更高的表面粗度 (~28%) 和更活跃的部位,导致与光亮侧面相比,Al/脱落的电流密度更高.
- 离子液/AlCl3预处理修改了Al薄膜表面,形成一个富含Al-Cl-N的介相层,增强了Al扩散.
- 尽管初始性能有所改善,但长时间循环 (500 个循环) 会导致树突性 Al 沉积,电极粉碎以及由于 Al 金属/氧化物去除而加速的局部腐蚀.
结论:
- 合金的非闪光面为合金电池提供了优越的电化学活性.
- 用离子液体进行表面预处理可以创建有益的相间层,但长期稳定性仍然是一个挑战.
- 了解表面特性,预处理和循环之间的相互作用对于开发强大的Al阳极至关重要.
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