促进基于电解质的低溶解 - 硫电池的速率性能
Tian Jin1,2, Xi-Yao Li3, Meng Zhao3
1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P.R. China.
Angewandte Chemie (International ed. in English)
|June 3, 2025
概括
研究人员通过解决弱溶解电解质 (WSE) 中缓慢的硫阴极动力学来提高硫 (Li-S) 电池的性能. 一个氧化还原调解策略增强了电荷转移,使实用袋细胞能够稳定循环和高能量密度.
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) 电池具有较高的理论能量密度.
- 弱溶解电解质 (WSE) 减轻了多硫化物穿,但导致阴极运动缓慢.
- 降低速率性能是基于WSE的Li-S电池的一个关键挑战.
研究的目的:
- 系统地研究基于WSE的Li-S电池中缓慢的硫阴极动力学.
- 确定影响高充/放电速率容量的主要动力限制.
- 开发策略,以提高Li-S电池在实用的袋式电池格式中的速度性能.
主要方法:
- 基于WSE的Li-S电池阴极的动态分析.
- 两极分化的脱,以确定主导的动力挑战.
- 开发和实施一个氧化还原调解策略.
- 对3Ah和5Ah袋式电池的性能测试.
主要成果:
- 在充电过程中缓慢的阴极动力学限制了高速率的特定放电容量.
- 从聚硫化物氧化到元素硫的激活偏振是主要的动力障碍.
- 拟议的氧化还原调解策略显著加速了多硫化物氧化动力学.
- 在3 Ah袋式电池中在0.2 C处实现了稳定的循环运行,在5 Ah袋式电池中实现了470 Wh kg-1的能量密度.
结论:
- 了解WSE中的硫阴极动力学对于改善Li-S电池性能至关重要.
- 氧化还原调解是一种有效的策略,可以克服基于WSE的Li-S电池的动力限制.
- 这种方法可以开发高能量密度和高速率的Li-S电池,用于实际应用.
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