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In recent years, lithium-ion batteries have been widely used in mobile electronic equipment, electric vehicles, energy storage power stations, smart grids and other fields. Because of its rich resources, environmental friendliness, designable structure and high theoretical capacity, organic electrode materials have aroused the strong interest of researchers, but the shortcomings of organic electrode materials such as easy insoluble organic electrolyte, low conductivity, and slow reaction kinetics restrict their development. Two-dimensional conductive metal-organic framework (MOF) materials are new types of conductive functional materials in recent years, showing potential application prospects in many fields. As a solid material with both conductiveness, redox coordination nodes and porosity, two-dimensional conductive MOF is an ideal material platform for fixing redox active organic fragments.
Recently, the team of Professor Bin Deshan/Dan Li of Jinan University used the nitrogen-rich molecule tricyclic quinazoline (TQ) for the first time to construct a two-dimensional conductive metal-organic framework (MOF) material Cu-HHTQ, and studied its application in lithium-ion batteries. TQ as a nitrogen-rich conjugate thick ring molecule has good redox activity, combined with the redox activity of the coordination node CuO4, the constructed Cu-HHTQ obtains multiple redox active sites, which can be applied as a high specific capacity lithium-ion battery anode material. Thanks to cu-HHTQ's high conductivity, porous and multi-electron redox properties, it exhibits high specific capacity, good magnification performance and excellent cycle stability as an anode material for lithium-ion batteries. Cu-HHTQ has a reversible specific capacity of 657.6 mAh g-1 at a current density of 600 mA g-1, and still has a capacity retention rate of 82% after 200 cycle charge and discharge cycles, which is at a high level among the conductive MOF materials reported today. In order to explore the mechanism of Electrochemical Lithium Storage in Cu-HHTQ, the authors also prepared TQ molecules and studied their lithification reaction process through electrochemical tests and theoretical calculations, verifying for the first time that TQ has a 9-electron redox process. Constructing TQ in a conductive metal-organic framework Cu-HHTQ can effectively increase its specific capacity as an anode material for lithium-ion batteries.
This paper combines the TQ fragments of redox activity into two-dimensional conductive MOFs, and constructs a porous conductive electrode material with multiple redox activity, which provides a new idea for the design of electrode materials for high-performance ion batteries.
Related papers published in Angw. Chem. Int. Ed. The first author of the paper is Dr. Yan Jie, a postdoctoral fellow of Jinan University, and the corresponding authors are Professors Bin Deshan and Li Dan.
Immobilizing Redox-Active Tricycloquinazoline into a 2D Conductive Metal-Organic Framework for Lithium Storage
Jie Yan, Yutao Cui, Mo Xie, Guo-Zhan Yang, De-Shan Bin, Dan Li
Angew. Chem. Int. Ed., 2021, DOI: 10.1002/anie.202110373
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