基于离子双极相互作用的无溶剂共价有机框架单离子导体,用于全固态有机电池
Zhongping Li1,2, Kyeong-Seok Oh1, Jeong-Min Seo2
1Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 03722, Republic of Korea.
Nano-micro letters
|August 9, 2024
概括
新的共价有机框架 (COF) 离子导体利用离子双极相互作用来增强离子 (Li+) 运输. 这一突破使得有金属阳极的固态有机电池能够保持稳定的性能.
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
- 聚合物科学 聚合物科学
背景情况:
- 共价有机框架 (COF) 作为单离子导体具有前景,但离子 (Li+) 运输缓慢限制了它们的使用.
- 传统的离子导体通常依赖于强大的离子-离子相互作用,这可能导致不良的副作用反应和不良导电性.
- 开发高效和稳定的固态电解质对于推进下一代电池技术至关重要.
研究的目的:
- 设计和合成基于COF的新型单离子导体 (Li-COF@P),使用独特的离子双极相互作用机制.
- 研究离子双极相互作用对+解离和COF结构内的迁移的影响.
- 为了评估Li-COF@P作为固态有机电池中的电解质的电化学性能.
主要方法:
- 制造Li-COF@P通过在COF孔内嵌入聚乙烯甘二烯酸盐,以创建定向离子通道.
- 离子运输特性的表征,重点关注Li+解离和由离子双极相互作用促进的移动性.
- 组装和测试使用Li-COF@P作为固体电解质的5,5'-二甲基-2,2'-二-p-基 (Me2BBQ) 阴极电池.
主要成果:
- 由于Li+与嵌入聚合物之间有利的离子双极相互作用,Li-COF@P表现出增强的Li+导电性.
- 在金属电极上展示了可逆涂层和剥离,表明了良好的界面兼容性.
- 在环境条件下在有机电池中实现了稳定的循环性能,在2000个循环后保持了88.3%的容量.
结论:
- 开发的Li-COF@P材料有效地克服了基于COF的电解质中的缓慢离子导电问题.
- 离子双极相互作用策略为设计用于固态电池的高性能单离子导体提供了可行的途径.
- 这些发现凸显了Li-COF@P在全固态有机电池中的实用应用的巨大潜力.
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