暨南大学李丹团队在新研究中，将氧化还原活性三环喹唑啉固定在二维导电金属有机框架中用于储锂。相关研究成果发表在2021年9月14日出版的《德国应用化学》。
杂环共轭芳香族分子在锂离子电池等可充电电池中引起了广泛的兴趣，但由于导电率低和易溶于电解质而受到限制。
该文中，研究人员将富含氮的芳香族分子三环喹唑啉（TQ）和CuO4单元固定在二维导电金属有机框架（MOF）中，以释放其储存Li+的潜力。首次用Li+鉴定TQ的氧化还原活性。由于TQ和CuO4单元的协同作用，2D导电MOF被命名为Cu-HHTQ（HHTQ=2,3,7,8,12,13-六羟基三环喹唑啉），可促进Li+/e-传输，并确保弹性电极，在600mA时产生657.6mA h g-1的高容量，具有极高的速率能力和令人印象深刻的循环能力。
该发现强调了一种有效的策略，即通过将多个氧化还原活性部分结合到导电MOF中来构建储能电极材料。
附：英文原文
Title: Immobilizing Redox-Active Tricycloquinazoline into a 2D Conductive Metal-Organic Framework for Lithium Storage
Author: Jie Yan, Yutao Cui, Mo Xie, Guo-Zhan Yang, De-Shan Bin, Dan Li
Issue&Volume: 2021-09-14
Abstract: Heteroaromatic-conjugated aromatic molecules have inspired numerous interests in rechargeable batteries like Li-ion batteries, but were limited by low conductivity and easy dissolution in electrolytes. Herein, we immobilize a nitrogen-rich aromatic molecule tricycloquinazoline (TQ) and CuO 4 unit into a two-dimensional (2D) conductive Metal-Organic Framework (MOF) to unlock their potential for Li + storage. TQ was identified redox activity with Li + for the first time. With a synergistic effect of TQ and CuO 4 unit, the 2D conductive MOF, named Cu-HHTQ (HHTQ = 2,3,7,8,12,13-hexahydroxytricycloquinazoline), can facilitate the Li + /e - transport and ensure a resilient electrode, resulting in a high capacity of 657.6 mAh g -1 at 600 mA g -1 with extraordinary high-rate capability and impressive cyclability. Our findings highlight an efficient strategy of constructing electrode materials for energy storage with combining multiple redox-active moieties into conductive MOFs.
DOI: 10.1002/anie.202110373
Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202110373
