在位凝共价有机框架电解质与远距离互连骨架,具有卓越的离子导电性
Chaoqun Niu1,2, Shu Zhao1,2, Yuxi Xu2
1Zhejiang University, Hangzhou 310027, Zhejiang Province, China.
Journal of the American Chemical Society
|December 19, 2023
概括
我们开发了一种新方法来制造COF凝电解质 (CGEs), 这些CGE改善了离子传输,并使金属电池稳定.
科学领域:
- 材料科学
- 电化学
- 聚合物化学
背景情况:
- 共价有机框架 (COF) 为离子传输提供了理想的有序纳米通道.
- 在将COF合成与最佳电解质的电池制造相结合时存在挑战.
- 现有的方法难以创建连续的离子通道和低阻抗接口.
研究的目的:
- 开发一种用于生产COF凝电解质 (CGEs) 的现场凝方法.
- 将COF合成直接集成到电池电解质制备环境中.
- 增强电池电解质中的离子传输和电化学接口特性.
主要方法:
- 使用现场凝技术在液体碳酸盐电解质中合成COF凝电解质 (CGEs).
- 该方法利用盐和COF构建块之间的预协调来实现相互连接的晶体COF骨架.
- 在COF中加入亲和基来增强离子导电.
主要成果:
- 与液体电解质相比,开发的CGEs显示离子导电率增加了3倍 (10.5mS cm-1).
- 低激活能量 (0.068 eV) 促进了有效的离子传输和超过1800小时的无树脂沉积.
- 在极端条件下 (101 mAh g-1) 和循环稳定性 (158 mAh g-1在折叠状态下) 实现了优异的速度性能.
结论:
- 在现场凝方法成功地将COF合成与电池电解质制备相结合.
- 由此产生的CGE显著提高了离子电池的电导率,稳定性和性能.
- 该方法具有多样性,适用于各种金属离子电池系统 (K,Mg,Zn,Na,Ca).
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