将共价有机框架剥离为离子电池的几层反氧活性纳米板作为阴极材料
Shan Wang1, Qianyou Wang1, Pengpeng Shao1
1Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, P. R. China.
Journal of the American Chemical Society
|March 21, 2017
概括
新型脱皮共价有机框架 (ECOF) 为有机可充电电池提供了增强的存储. 这些二维纳米片为下一代储能提供更快的动力学和更好的循环稳定性.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 共价有机框架 (COF) 具有结构多样性和可调性,使其对各种应用具有前景.
- 有机充电电池需要高效的阴极材料来提高储能性能.
- 大量COF往往遭受缓慢的离子扩散,限制了它们的电化学性能.
研究的目的:
- 使用氧化还原活性共价有机框架 (COF) 开发新的有机可充电电池阴极.
- 为了提高储存,研究脱皮COF (ECOF) 的电化学特性.
- 通过网状设计来设计COF的容量和潜力.
主要方法:
- 三种不同的氧化还原活性COF合成和分层成2D少数层纳米板 (ECOF).
- 对于存性能,包括循环稳定性和速率能力的ECOF的电化学特性.
- 在原始COF与ECOF中分析电荷转移动力学和Li+扩散路径.
主要成果:
- 脱皮COF (ECOF) 的+扩散路径显著缩短,导致更高的氧化还原位利用率和更快的动力学.
- 在ECOF中,反氧反应主要由电荷转移主导,与散装COF中的扩散控制过程不同.
- DAAQ-ECOF表现出良好的充电能力 (在1800个循环后保持98%的容量) 和速度能力.
- 在2.8V的电压平原下,DABQ-ECOF的特定容量为210mAhg-1.
结论:
- 将COF剥离成二维纳米片是一种有效的策略,以提高其在有机可充电电池中的性能.
- 与散装相比,ECOF具有更高的存动力和循环稳定性.
- 在不改变基本拓的情况下,COF的网状设计提供了调整电化学性能的途径.
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