Synthetize Of Aniline Copolymer And The Basic Research Of The Application In Hybrid Supercapacitor

Energy density and power density are two important elements for electric energy reservation.Hybrid supercapacitors（HSC）combine the working principles of batteries and capacitors and hence mast the high energy and power density simultaneously.Carbonous materials with high specific surface area are the common cathode material for HSC.However,its physical energy storage mechanism limits capacitance properties.Besides,the microporous structure further undermines the capacitive reaction at high current densities.Conducting polymers are also the important cathode materials of HSCs for their pristine high electronic conductivities and the special energy store mechanism derived from the doping/dedoping anions with favorable kinetics.Here,aniline（ANI）and2-aminoterephthalic acid（ATA）were synthesized by the chemical oxidation polymerization at different molar ratios of monomers（ANI/ATA）.The appropriate amount of carboxyl groups enabled the delocalization of charge along the polymer backbone and the intermolecular forces.The copolymer synthesized at ANI/ATA value of 8:2 exhibited the morphology of regular nanorods,which is benefit for the anions diffusion.The best electrochemical performances of high specific capacitance（198 F/g at the current density of 20 mA/g）,excellent rate capability（the maximum current density of 50 A/g）,and excellent cycling stability（capacitance retention of 78.5%after 1000 cycles at 2 A/g）were gotten with the ANI/ATA value of 8:2.The energy density of 153.9 Wh/kg and the power density of 3011.5 W/kg of HSCs are obtained with commercial meso-carbon microbeads（MCMBs）and Li₄Ti₅O₁₂（LTO）as anode materials,respectively.