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单一离子固定共价有机框架用于具有增强速率能力的硫电池

Xiaolin Liu^1,2, Xu Ding¹, Tianyu Zheng¹

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.

ACS applied materials & interfaces

|January 19, 2024

概括

本研究介绍了用于增强硫电池 (LSB) 的功能化共价有机框架 (COF). 在USTB-27-Co中开放的金属部位显著改善了聚硫化物转化和电池性能.

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
催化剂是一种催化剂.

背景情况:

共价有机框架 (COF) 为高级应用提供可调节的结构和稳定性.
在COF中加入"开放金属位点"可以增强小分子结合和基质激活.
硫电池 (LSB) 需要高效的方法来转化聚硫化物和活性物质结合.

研究的目的:

合成和描述一个双孔COF,USTB-27,具有hxl拓.
通过合成后修改将单个位引入COF结构,以创建USTB-27-Co.
评估USTB-27-Co作为硫电池中的电极材料的性能.

主要方法:

通过 imine 化学组装双孔 COF USTB-27.
后合成功能化USTB-27与单一的网站.
在LSB中对含硫的S@USTB-27-Co复合材料进行电化学测试.

主要成果:

与S@USTB-27.Co相比,S@USTB-27-Co复合材料表现出优越的排放能力和速度性能.
在5.0°C时保持产能从S@USTB-27的19%增加到S@USTB-27-Co.的61%.
在1.0°C的500个循环后,S@USTB-27-Co保持了比S@USTB-27 (402 mA hg-1) 更高的特定容量 (543 mA hg-1).

结论:

"开放金属站点"战略有效地设计了COF通道内的活性化学转化.
合成后的COF功能化增强了LSB中活性物质的结合亲和力.
USTB-27-Co显示了提高硫电池性能和稳定性的巨大潜力.

关键词:

共价有机框架是共价有机框架.电催化剂是一种电催化剂.- 硫电池的使用情况.通过合成后的修改.业绩表现率是指业绩的表现率.

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