可互换和再生的易斯酸性电解质添加剂,用于薄电解质硫电池
Hannah Cho1, Jinkwan Jung2, Ilju Kim1
1Department of Chemical and Biomolecular Engineering, KAIST, Yuseong-gu, Daejeon, Republic of Korea.
Nature communications
|July 24, 2025
概括
将离子添加到硫电池中可以显著提高精益电解质的性能. 这项创新通过防止聚硫化物问题来提高能量密度和循环稳定性.
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:
- 实用的硫 (Li-S) 电池需要精的电解质来实现高能量密度.
- 低的电解质/硫 (E/S) 比率导致缩的聚硫化物,阻碍循环和容量.
研究的目的:
- 为了解决瘦电解质Li-S电池的局限性,使用易斯酸性添加剂.
- 在Li-S电池设计中提高能量密度和循环稳定性.
主要方法:
- 在电解质中加入离子 (Ca2+) 作为易斯酸性添加剂.
- 在各种E/S比率和电流密度下,用Ca2+添加剂对Li-S袋式电池进行电化学测试.
- 对聚硫化物转化,穿效应和腐蚀缓解的分析.
主要成果:
- Ca2+将聚硫化物转化为CaS和S8,防止电解质堵塞和穿.
- 在现场形成的CaS催化了多硫化物减少,并在充电过程中再生Ca2+.
- -S细胞在220个循环中达到493 Wh kg-1 (E/S = 2.4 μL mg-1) 的70%保留率,在360个循环中达到346 Wh kg-1 (E/S = 2.9 μL mg-1) 的77%保留率.
结论:
- 该Ca2+添加剂有效地解决了精益电解质Li-S电池的关键挑战.
- 这种方法整合了Li-S和-硫 (Ca-S) 化学,以提高性能.
- 该研究表明,一种可行的策略是平衡Li-S电池的能量密度和循环稳定性.
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