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全共价有机框架纳米膜组装了离子电容器,以解决不平衡的电荷存储动力学

Xiaoyang Xu¹, Jia Zhang^1,2, Zihao Zhang¹

¹College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, People's Republic of China.

Nano-micro letters

|February 15, 2024

概括

这项研究引入了离子电容器 (LIC) 的新型共价有机框架 (COF) 纳米膜,实现了高能量密度和稳定性. 这些先进的COF材料平衡充电储存动力学,以提高设备性能.

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
纳米技术纳米技术

背景情况:

离子电容 (LIC) 面临着电池类型阳极和电容类型阴极之间的电荷储存动力不平衡的挑战.
独立的共价有机框架 (COF) 纳米膜提供了快速离子互和丰富的活性位点的潜力,解决了动力不匹配问题.

研究的目的:

通过合成定制的COF材料,为阳极和阴极开发一个全COF纳米薄膜结构的LIC.
调查基于COF的新型LIC的性能和充电存储机制.

主要方法:

合成COF_BTMB-TP (阳极) 和COF_TAPB-BPY (阴极) 的纳米膜.
一个全COF纳米薄膜结构的LIC设备的制造.
电化学性能测试 (能量/功率密度,速率能力,循环稳定性).
使用现场XPS,Li固态NMR和DFT计算的材料表征.

主要成果:

在COF_TAPB-BPY//COF_BTMB-TP LIC中,在6W cm^{-3时实现了318mWh cm^{-3的高能量密度.}}
该设备在5000个循环后表现出极好的速度能力和77%的容量保留.
COF_BTMB-TP证明了促进Li⁺迁移和通过C-F,C=O和C-N债券与Li⁺的强烈相互作用.

结论:

开发的全COF纳米薄膜LIC有效地解决了传统LIC中动力和容量不平衡的挑战.
这项工作为薄膜型LIC和超级电容器设定了新的基准,为小型化和可穿戴能源存储设备铺平了道路.

关键词:

电荷储存的动力学.共价有机框架是共价有机框架.离子电容器的电容器是离子电容.

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