Thiophene Dicarboxylic Acid Metal Organic Frame Derived Multiple Composite Materials And Energy Storage

Metal-organic frameworks（MOFs）are formed by using metal or ion clusters and organic ligands as bridges.MOFs and their derived materials are widely used as anode materials for lithium-ion batteries due to their large specific surface area,stable structure,diverse composition,and flexible and easily adjustable structure.In this paper,double metal CuMn-MOF and double ligand CoMOF were synthesized by solvent thermal method and used as precursors derived into multivariate composites.（1）Dimetetallic CuMn-MOF were synthesized with 2,5-thiophene dicarboxylic acid as ligand and manganese acetate as metal sources,and used as precursors to derive a ternary composite of Cu,Mn₃O₄and S doped C.The optimal derivation temperature is350℃,and the optimal metal ratio between Cu and Mn is 1:1.The capacity is 508 mAh g^-1after 500 charge-discharge cycles at a current density of 500 mA g^-1.The pseudopocapacitance test shows that the transport dynamics mechanism of the composite is jointly controlled by the surface capacitance and the diffusion capacitance behavior.（2）With 2,5-thiophene dicarboxylic acid and terephthalic acid as ligand,and cobalt nitphthalic acid as metal sources,the nanosheet double ligand Co-MOF were synthesized,and the effects of surfactant and ligand ratio on morphology were explored.The ternary composite materials of CoO,MOF,N and S doped carbon were derived by using Co-MOF as the precursors.The composite was maintained at 200 mA g^-1current density with 100charge-discharge cycles with a capacity of 819.8 mAh g^-1.（3）On the basis of the（2）study,the effects on morphology and energy storage performance were explored by the addition of auxiliary agents such as urea,glucose,triethylamine,activated carbon,g-C₃N₄.The floral bulb 2T-CoMOF assembled from the nanosheets was obtained upon the addition of triethylamine.The calcination at different temperatures under argon gas resulted in various composite materials.Among them,CoO,CoMOF and N and S doped carbon have the best performance as the cathode materials of lithium-ion batteries with 350℃.At 200 mA g^-1current density,with 100 charge-discharge cycles,the capacity remains approximately 1000 mAh g^-1.At 1 Ag^-1high current density,500 cycles after the capacity of up to 796 mAh g^-1.