Effects of various EC plasticizer concentrations on salted PEO based solid polymer electrolytes

Abstract

In this research, various weight percent of EC plasticizer are incorporated into salted PEO based polymer electrolyte system. Thin film electrolytes are prepared via solution casting technique and characterized by FTIR, XRD and DSC analysis in order to study their complex behaviour. The amorphicity of the electrolytes are measured by DC Impedance. The results reveal that the conductivity increases with increasing temperature when the EC plasticizer concentration increases up to 15 wt%. The temperature conductivity studies for 15 wt%. of EC plasticizer decrease due to displacement of the host polymer by plasticizer molecules within the salt complexes. Thus, it will decrease in ionic mobility. XRD studies reveal that the phase changes from crystalline to amorphous when EC plasticizer concentration increases. DSC studies indicate a decrease in Tm with increasing EC plasticizer concentration. Finally, the complexation process is examined using FTIR.