Study On Preparation And Performance Of Micro/Nanostructure Polyaniline

Recently years, polyaniline has become a focus in conducting polymers due to its ease of preparation, remarkable processability, excellent environment stability, special electronic properties. Especially, micro/nanostructure polyaniline have received great interest because it could be potentially used in including polymeric conducting molecular wires, biosensors, gas separation, electronic devices, etc. In this article, micro/nanostructures PANI were prepared by oxidative chemical polymerization. PANI with different morphologies used as anode of lithium secondary battery. Electrochemical performance of the batteries were investigated and analyzed.The microcosmic morphologies and conductivities of polyaniline were influenced by acid concentration, oxidant concentration, methyl orange concentration and reaction temperature, time and other factors. These factors were investigated and optimized. In the condition of n(MO) : n (An)=0.06,n(HCl) : n (An)=1.5,n(APS) : n (An) =1, APS was dropped into the system, rapid stirring, the reaction temperature was 0℃, the reaction time was 11 hours, the products were washed with deionized water, methanol and ether in sequence, polyaniline with order morphology was obtained. The thermal stability,conductivities,constitutions, structures and micro morphologies were confirmed and characterized by means of thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy images (TEM), fourier transform infrared spectra (FTIR),UV-vis spectrometry and X-ray diffraction (XRD) , respectively. The formation mechanism of polyaniline tubes were also investigated.PANI with different morphologies were used as anode of lithium secondary battery, polyaniline electrode were investigated by means of cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge/discharge measurements. The effects of electric current, electric agent, binder, cold-molded pressure of anode pellet and thickness on the properties of batteries were discussed in detail. The influences of morphology of anode material on battery properties were studied and analyzed. Low charge/discharge electric current, thin anode pellet , 20% binder and 5% black carbon were added, cold-molded pressure with 20 MPa, anode material with order morphology which make battery show good properties.