Characterization of PEO-LiClO4-PC Solid Polymer Electrolytes

Plasticized poly (ethylene oxide) based electrolyte membranes of various compositions poly (ethylene oxide) / lithium perchlorate / propylene carbonate were prepared by solution casting. The thermogram, electrical conductivity and vibrational spectra were studied. DSC revealed that the plasticizer propylene carbonate content has influenced on the melting and transition temperature. The infrared spectroscopic study on the effect of PC on the poly (ethylene oxide) / lithium perchlorate / propylene carbonate systems shows that a suitable propylene carbonate content can impede association between lithium ions. Room temperature conductivity changed over 2 order of magnitude, increasing from 6.8 × 10-8 Scm-1 of poly(ethylene oxide) / lithium perchlorate (10/3, w/w) to 8.9 × 10-6 Scm-1 of poly(ethylene oxide) / lithium perchlorate / propylene carbonate (10/3/10, w/w/w). It seems that lithium ions only interact with PEO crystalline phase at the presence of PEO.