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"体中的阴离子"为高可逆性金属阳极的水合深电解质
Min Cheng1,2, Diantao Li1,2, Junlun Cao3
1State Key Laboratory of Advanced Chemical Power Sources, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071, China.
Angewandte Chemie (International ed. in English)
|July 18, 2024
概括
这项研究引入了一种新型的"聚合物中的阴离子"水合深电解质 (ACDE-3),可显著提高水性电池中阳极的稳定性. 新的电解质抑制了树突形成和副作用反应,使电池寿命更长,电化学稳定性更广泛.
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:
- 水性电池中的金属阳极面临着像岩形成,副作用反应和有限的电化学稳定性等挑战.
- 现有的电解质很难为高性能水性电池提供必要的稳定性.
研究的目的:
- 设计和研究一种新型的水合深电解质 (ACDE-3),以提高阳极稳定性.
- 探索独特的"聚合物中的阴离子"结构及其对电解质特性和电化学性能的影响.
主要方法:
- 使用Zn(ClO4) 2·6H2O,β-环氧化 (β-CD) 和H2O的ACDE-3的配方.
- 分析电解质的键网络,溶解和通过β-CD微粒的阴离子限制.
- 电化学测试Zn//Zn对称电池,Zn//Cu半电池和使用聚1,5-NAPD) 阴极的全电池.
主要成果:
- ACDE-3 呈现出一种"体中的离子"结构,限制了离子运动,导致高的 Zn2+ 转移数 (0.84).
- 电解质有效地抑制树突,离子相关的副作用反应和演化反应 (HER),将电化学稳定窗口 (ESW) 扩大到2.32V.
- Zn//Zn对称电池实现了900小时的稳定性,Zn//Cu半电池显示了97.9%的平均库伦比效率,充满电池在200个周期内稳定循环.
结论:
- "聚合物中的阴离子" (anions-in-colloid) 的化深度电解质 (ACDE-3) 为稳定水性电池中的阳极提供了一个有前途的解决方案.
- ACDE-3在广泛的温度范围 (-40°C至40°C) 中表现出色,提高了电池的安全性和适用性.
- 这种电解质设计为开发高性能和耐用的水性电池打开了新的道路.
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