Xiao Hong, Luo Derong, Zhang Yiduo, Liu Feng, Xu Shu, Ding Bing, Dou Hui, Zhang Xiaogang
Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China.
ACS Appl Mater Interfaces. 2024 Oct 9;16(40):54049-54057. doi: 10.1021/acsami.4c13729. Epub 2024 Sep 30.
As a high-performance energy storage device consisting of a battery-type anode and a capacitor-type cathode, hybrid lithium-ion capacitors (HLICs) combine the advantages of high energy density of batteries and high power density of capacitors. However, the imbalance in electrochemical kinetics between the battery-type anode and the capacitor-type cathode hinders the further development of HLICs. Fully conjugated covalent organic frameworks have great potential as electrode materials for HLICs due to the designability of their structure. Herein, a fully conjugated covalent triazine framework (PT-CTF) integrating the hexaazatrinaphthylene unit was constructed, which provides abundant active sites (C═N and C═C groups) as the pseudocapacitive anode material for HLICs. And the connection of the triazine unit of PT-CTF improves the molecular conjugate degree, facilitating the transport of electrons. The fabricated PT-CTF||AC HLICs exhibit a high energy density (164.9 Wh kg at 100 mA g), large power density (13.1 kW kg at 4 A g), and excellent cycling capability (72% after 10 000 cycles at 2 A g).
作为一种由电池型阳极和电容型阴极组成的高性能储能装置，混合锂离子电容器（HLIC）兼具电池高能量密度和电容器高功率密度的优点。然而，电池型阳极和电容型阴极之间的电化学动力学不平衡阻碍了HLIC的进一步发展。由于其结构的可设计性，全共轭共价有机框架作为HLIC的电极材料具有巨大潜力。在此，构建了一种整合六氮杂三亚萘单元的全共轭共价三嗪框架（PT-CTF），其提供了丰富的活性位点（C═N和C═C基团）作为HLIC的赝电容阳极材料。并且PT-CTF的三嗪单元的连接提高了分子共轭程度，促进了电子传输。制备的PT-CTF||AC HLIC表现出高能量密度（在100 mA g时为164.9 Wh kg）、大功率密度（在4 A g时为13.1 kW kg）以及优异的循环性能（在2 A g下10000次循环后为72%）。
