Caracterização espectroscópica de eletrólitos compósitos de poli(óxido de etileno) e triflato de sódio com adição de nanofibras de polianilina

Abstract

Solid polymer electrolytes are safer alternatives for rechargeable sodium batteries, when compared to organic liquid electrolytes. However, these electrolytes still present low ionic conductivity values at room temperature; thus, the need for doping or using different types of additives for better electrochemical performance is clear. Hence, this work aims to spectro scopically characterize a new Poly(ethylene oxide) (PEO) and sodium triflate (NaOTf) polymer electrolyte with the addition of polyaniline nanofibers. The polyaniline nanofibers were prepared using the fast mixing method, with HCl serving as the doping acid. The PEO:NaOTf 60:1 and 40:1 polymer electrolytes were prepared by solution casting, with different amounts of PANI added to each electrolyte film. The electrolyte films were characterized by Raman and ATRIR spectroscopies to determine the ionic association in the solid medium, by electronic impedance spectroscopy to measure the ionic conductivity of each electrolyte membrane and by thermal analysis (TG) to determine the thermal stability of the electrolytes.