Study On Preparation And Performance Of Micro/Nanostructure Polypyrrole And Polyaniline

Polypyrrole (PPy) and Polyaniline (PANI) are the typical conducting polymers with high conductivity, electrical redox property, good stability and high electric charge reserve ability. They have potential applications in polymeric conducting molecular wires, chemical sensors and micro-actuator as they possess the advantages of both low-dimensional micro/nanostructure and organic conductor. In this study, PPy micro-ribbons and PANI micro/nanotubes were prepared by oxidatively chemical polymerization. The relation between conductivity and morphology and its formation mechanism were investigated.The polymerization conditions such as reaction time, the amount of oxidation, the amount of HCl, the amount of AMY GG, the way of washing, the kind of dopant and adding methods of oxidants were optimized by using AMY GG as novel dopant. PPy micro-ribbons were synthesized by the following conditions, n(AMY GG) : n (Py)=1,n(HCl) : n (Py)=0.8,APS as the oxidant, APS was dropped into the system, the reaction temperature was 0~5℃, the products were washed with deionized water, methanol and ether in sequence. PANI micro/nanotubes were synthesized by the following conditions, n(AMY GG) : n (ANi)=0.05,n(HCl) : n (Py)=1,APS as the oxidant, APS was dropped into the system, the reaction temperature was 0~5℃, the products were washed with deionized water, methanol and ether. For studying the influence of the polymerization conditions on the conductivity of PPy and PANI, the reaction time, the amount of oxidation, the amount of HCl, the amount of AMY GG and the reaction temperature were investigated by orthogonal experiment. The constitution, structure, morphology and thermal stability of PPy and PANI were characterized by FTIR, UV-vis, SEM, TEM, XRD and TGA. The conductivity was measured by four-probe instrument. The influence of the amount of AMY GG on the conductivity of PPy and PANI were studied by elements analysis.The button-type lithium secondary battery was fabricated with PPy micro-ribbons or micro-spheres as anode. The properties of the batteries were investigated and characterized by galvanostatic charging-discharging test, cyclic voltammetry and a.c impedance. The effects of the morphology of PPy on electrochemical properties of Li/PPy secondary batteries were investigated.