A green ligand-based copper-organic framework: a high-capacity lithium storage material and insight into its abnormal capacity-increase behavior
A green ligand-based copper-organic framework: a high-capacity lithium storage material and insight into its abnormal capacity-increase behavior
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一种基于绿色配体的铜有机框架：一种高容量锂存储材料及其异常增容行为
DOI：
10.1039/d0nj04061d
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发表时间：
2020
影响因子：
3.3
通讯作者：
Hu Bingwen
中科院分区：
文献类型：
--
作者：
Lou Xiaobing;Hu Xiaoshi;Xiang Shuyan;Li Chao;Yang Qi;Hu Bingwen
金属有机骨架(MOF)被认为是潜在的锂存储材料，因为它们具有氧化还原活性，可以吸收电子和孔洞，从而有利于离子的传输和存储。为了提高它们的性能和实际应用，本工作首次将一种绿色廉价的配体柠檬酸盐用于构建铜基MOF阳极。所制备的铜碳纳米管具有优良的容量、稳定性和倍率性能，1次循环容量为608.5和321.5 mA g−1,500次循环后容量为2 A g−1，是铜基MOF中最好的材料。此外，还通过非原位电子顺磁共振(EPR)和X射线吸收精细结构(XAFS)观察和详细研究了其反常的扩容行为。这些结果揭示了金属中心在循环中逐渐参与氧化还原的过程，这首次揭示了MOF在LiB应用中的渐进活化过程。
Metal–organic frameworks (MOFs) are believed to be potential lithium storage materials for their redox activity that can uptake electron and porosity that in turn can favor ion transport and storage. To boost their performance and practical use, in this work, a green and cheap ligand citrate is first used in constructing a Cu-based MOF anode. The as-prepared Cu-CIT exhibits excellent capacity, stability, and rate capability, with the capacities of 608.5 and 321.5 mA h g−1 at 1 and 2 A g−1 after 500 cycles, being the best one among Cu-based MOFs. Moreover, its abnormal capacity-increase behavior is also observed and elaborately investigated through ex situ electron paramagnetic resonance (EPR) and X-ray absorption fine structure (XAFS). These results reveal the gradual redox participation of metal centers during cycles which for the first time shed light on the progressive activated process of MOFs in LIB applications.