用于硫电池的结合式三维高连接共价有机框架
Wenbo Liu1, Lei Gong1, Zhixin Liu1
1Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry and Chemical Engineering, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
研究人员使用pentiptycene构建块开发了新的合3D共价有机框架 (COF). 这些材料具有高导电性和多孔性,使其成为先进的硫电池的前景.
科学领域:
- 材料科学
- 有机化学
- 电化学
背景情况:
- 由于缺乏合适的3D结合构建块,开发结合的三维 (3D) 共价有机框架 (COF) 是一个挑战.
- 现有的方法往往难以实现先进应用所需的电子特性和结构完整性.
研究的目的:
- 合成具有增强导电性和多孔性的新型3D合COF.
- 研究这些COF作为高性能硫电池 (LSB) 的宿主材料的潜力.
主要方法:
- 基于8连接的pentiptycene构件 (DMOPTP) 和4连接的正方形平面连接器之间的凝结反应.
- 使用技术来确定其结构,多孔性和导电性,对产生的3DCOF (3D-scu-COF-1和3D-scu-COF-2) 进行表征.
- 电化学测试COF作为电池中的硫宿主.
主要成果:
- 成功合成了两种具有双重互穿的scu拓的新型3DCOF.
- 由于π电子移位,COF表现出极好的电导率 (3.2-3.5 × 10−5 S cm-1).
- 实现了高表面积 (2340 和 1602 m2 g-1) 和永久的多孔性,促进了小分子的储存和运输.
- 作为LSB中的硫宿主,COF表现出高容量 (在0.2°C时为1035-1155 mA hg-1),优异的速率能力 (在5.0°C时为713-757 mA hg-1),以及卓越的循环稳定性 (在500个循环后保持71-83%).
结论:
- 开发的3D结合式COF克服了构建块可用性的局限性,并展示了卓越的性能.
- 这些材料作为高性能硫电池的先进有机阴极材料具有显著的前景.
- 导电性,多孔性和电荷传输性质的结合使这些COF成为下一代储能解决方案的领先候选者.
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