在金属电池中量化非活性
Chengcheng Fang1, Jinxing Li2, Minghao Zhang2
1Materials Science and Engineering Program, University of California San Diego, La Jolla, CA, USA.
Nature
|August 23, 2019
概括
非反应的金属 (Li0) 是金属阳极中不活性和容量损失的主要原因,而不是固体电解质相间化合物. 这一发现为下一代电池提供了更高效的涂层和剥离策略.
科学领域:
- 材料科学
- 电化学
- 电池技术
背景情况:
- 金属阳极具有较高的理论容量,但由于树的生长和低库伦比效率而受到阻碍,无法用于商业用途.
- 不活性,包括固体电解质间相中的Li+和未反应的金属Li0,导致容量损失和安全问题.
- 现有的诊断工具缺乏量化区分Li+和Li0的能力,这限制了对非活性形成的理解.
研究的目的:
- 建立一种分析方法,用于量化金属阳极中未发生反应的金属 (Li0).
- 确定这些阳极中不活跃的和容量损失的主要来源.
- 阐明非活性的形成机制和库伦比效率低的原因.
主要方法:
- 开发和应用定位气体色谱来量化未反应的金属Li0.
- 用冷电子显微镜 (扫描和传输) 进行微结构和纳米结构分析.
- 对不同类型的电解质进行研究,以了解不活性的形成.
主要成果:
- 在固体电解质间相中,未反应的金属Li0,而不是Li+,被确定为非活性和容量损失的主要贡献者.
- 该研究通过将Li0含量与微结构和纳米结构观测相关联来确定非活性的形成机制.
- 确定涂层和剥离过程中库伦比克效率低的根本原因.
结论:
- 定位气色谱提供了一种定量方法来评估Li金属阳极中的非活性.
- 专注于减轻未反应的金属Li0形成对于提高金属阳极性能至关重要.
- 拟议的战略旨在提高先进的高能电池的涂和剥离效率.
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