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不对称的阴离子盐衍生固体电解质间相启用长寿命水性电池
Shengmei Chen1, Shimei Li1,2, Longtao Ma3
1Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China.
Angewandte Chemie (International ed. in English)
|January 22, 2024
概括
一种新型的盐,Zn ((DFTFSI) 2),可以稳定水性电解质中的阳极,从而使长寿命和高效的电池成为可能. 这一突破避免了昂贵的粘性电解质,并提高了实际应用的安全性.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 阳极的水性电解质通常依赖有机添加剂,损害了安全性和环境兼容性.
- 高度的盐中的水电解质提高了阳极的可逆性,但成本昂贵且粘.
- 低度的盐对于直接稳定阳极至关重要.
研究的目的:
- 开发一种新型,低度的盐,用于稳定且没有树突的阳极.
- 在水性电解质中增强离子导电性和电化学性能.
- 探索Zn ((DFTFSI) 2) 在基电池中的潜力.
主要方法:
- 一种基于双二甲硫) 三甲硫) 胺 (DFTFSI−) 的新型盐的合成,Zn (DFTFSI) 2.
- 实验测试Zn的对称电池和Zn的Br2电池.
- 理论计算以了解Zn2+溶解中的DFTFSI−行为.
主要成果:
- Zn(DFTFSI) 2具有较高的离子导电性,并使其具有高度稳定的,无树的阳极.
- DFTFSI-优先减少形成保护性SEI膜,抑制副作用.
- 能电池表现出超长的循环寿命 (>2500小时); 能Br2电池表现出长寿命 (>1200个循环),高库伦比效率 (~99.8%) 和容量保留 (92.5%).
- 高面积容量Zn能Br2电池在320个循环中保持95.3%的初始容量.
结论:
- Zn(DFTFSI) 2是一种有前途的低度盐,用于稳定水性电解质中的阳极.
- 与传统方法相比,开发的电解质提供了卓越的性能和安全性.
- 这项工作为实用,高性能和经济高效的基于的储能系统铺平了道路.
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