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完全sp2碳结合共价有机框架,具有多个活跃站点,用于先进的离子电池阴极

Ning Fu¹, Ying Liu¹, Kun Kang²

¹School of Chemical and Environmental Engineering, Anyang Institute of Technology, Anyang, 455000, P. R. China.

Angewandte Chemie (International ed. in English)

|July 24, 2024

概括

合成了具有多个活性位点的化学稳定,sp2碳结合的共价有机框架 (sp2c-COF),用于高性能离子电池 (LIB). 这些新的COF表现出异常的容量和循环稳定性,推进了电池技术.

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
纳米技术纳米技术

背景情况:

联有机框架 (COF) 显示了可充电电池的潜力,但在活性位点,稳定性和导电性合成方面面临挑战.
开发具有增强电化学性能的COF对于推进储能解决方案至关重要.

研究的目的:

为高性能离子电池 (LIB) 设计和合成具有丰富活性位点的化学稳定,完全sp2碳结合COF (sp2c-COF).
控制COF的形态,以优化活性部位的暴露和利用.
研究合成的COF的电化学性能和储存机制.

主要方法:

聚合本佐[1,2-b:3,4-b':5,6-b']三烯-2,5,8-三甲基 (BTT) 和s-基-1,3,5,7(2H,6H) -四基 (ICTO) 形成BTT-ICTO sp2c-COFs.
在现场可控制的生长策略,以调节COF形态从"蝶形状"到"电缆形状".
电化学测试"电缆式"BTT-ICTO@CNT作为LIB阴极,包括容量,速率能力和循环性能.
现场里叶变换红外光谱 (FTIR),现场拉曼光谱和密度函数理论 (DFT) 计算以阐明储存机制.

主要成果:

成功合成了具有多个活性位点的化学稳定的sp2c-COFs (BTT-ICTO).
将受控的COF形态变为"电缆状"结构,增强活动部位的暴露和利用 (97.9%).
实现了特殊的LIB阴极性能:在0.1 A g-1时达到396 mAh g-1,在5.0 A g-1时达到227 mAh g-1,在2.0 A g-1时超过8000个周期时达到184 mAh g-1,且衰变速率低 (每周期为0.00365%).
通过先进的光谱和计算方法,详细了解储存机制.

结论:

设计的sp2c-COF为开发高性能LIB提供了一个有希望的途径.
形态控制是最大限度地利用活动部位和电化学性能的关键.
这项研究为先进的储能应用提供了COF的结构-属性关系的宝贵见解.

关键词:

碳纳米管是如何使用的阴极是天主体,它们是天主体.完全 sp2 碳结合的 COF 完全是 sp2 碳结合的有机电池有机电池有多个活跃站点.

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