了解基于固态硫转化在封闭环境中的Li-S电池的速率和容量限制
Ayca Senol Gungor1, Jean-Marc von Mentlen1, Jean G A Ruthes2,3
1Department of Information Technology and Electrical Engineering, ETH Zürich, Gloriastrasse 35, 8092 Zürich, Switzerland.
ACS applied materials & interfaces
|November 29, 2024
概括
高循环寿命的-硫 (Li-S) 电池使用浸的纳米孔碳阴极. 了解容量限制表明,电荷转移和阴极-电解质相间结构是提高性能的关键.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硫 (Li-S) 电池具有高的理论能量密度,但周期寿命有限,容量衰减.
- 在硫透的纳米孔状碳阴极中,保护性阴极-电解质间相 (CEI) 形成通过防止聚硫化物溶解来改善循环寿命.
研究的目的:
- 调查限制纳米孔碳阴极的Li-S电池容量和速率性能的因素.
- 阐明CEI形成和硫转化机制在纳米孔中的作用.
主要方法:
- 运行小角度中子散射 (SANS) 和X射线衍射 (XRD) 来观察循环过程中的结构变化.
- 电化学阻抗光谱和静电充/放电以评估性能限制.
- 使用了两种不同孔径的纳米孔径碳.
主要成果:
- 操作SANS和XRD证实了CEI的形成和硫的固态转化为硫化物 (Li2S) 在纳米孔内.
- 电化学数据表明,在活性材料接口和CEI/活性材料纳米结构上的电荷转移对于容量和速率性能至关重要.
- 性能与毛孔大小和CEI特征相关.
结论:
- 电荷转移动力学和纳米孔内的阴极-电解质介相的纳米结构是Li-S电池性能的主要限制.
- 专注于优化这些因素的策略可以提高硫载荷,硫利用率,速率能力和整体循环寿命.
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