导电金属有机框架Co-HHTP/石墨烯复合材料的制备及其储锂性能

Preparation of Conductive Metal Organic Framework Co-HHTP/Graphene Composite and Its Lithium Storage Performance

由四水合醋酸钴提供金属离子,2,3,6,7,10,11-六羟基三苯作为有机配体,水和N,N-二甲基甲酰胺混合溶液作为溶剂,采用液相合成法制备钴基导电金属有机框架Co-HHTP,随后与石墨烯超声混合后,得到Co-HTTP/G复合材料。探究了此复合材料的结构性质和作为锂离子电池负极的电化学性能。由X射线衍射、红外光谱仪、扫描电子显微镜以及电化学测试结果表明:当Co-HTTP/G作为负极时,表现出良好的循环稳定性以及较高的可逆比容量(在100 mA·g^(-1)下100圈后可逆比容量为1025 mAh·g^(-1))。

The metal ions were provided by cobalt acetate tetrahydrate.2,3,6,7,10,11-hexahydroxytriphenyl was used as the organic ligand,and the mixed solution of water and N,N-dimethylformamide was used as the solvent.The Co-based conductive metal-organic framework Co-HHTP was prepared by the liquid-phasemethod,and the Co-HTTP/G composite was obtained by introducing graphene through ultrasonic mixing.The structural properties and electrochemical performances of the composite as anode for lithium-ion batteries were investigated.The results of X-ray diffraction,infrared spectroscopy,scanning electron microscopy,and electrochemical measurements showed that when Co-HTTP/G was used as the anode,it exhibited a good cycling stability and high reversible specific capacity(a reversible specific capacity of 1025 mAh·g^(-1) after 100 cycles at 100 mA·g^(-1)).