โ Scribed by Hee-Jin Rhoo; Hee-Tak Kim; Jung-Ki Park; Taek-Sung Hwang
No coin nor oath required. For personal study only.
The new plasticized polymer electrolyte composed of the blend of poly(viny1 chloride) (PVC) and poly(methy1 methacrylate) (PMMA) as a host polymer, the mixture of ethylene carbonate and propylene carbonate as a plasticizer, and LiCFjSO3 as a salt was studied. The effect of the PMMAjPVC blend ratio and the plasticizer content on the ionic conductions in these electrolytes were investigated. The electrolyte films revealed a phase separated morphology due to immiscibility of the PVC with the plasticizer; the PVC-rich phase and the plasticizer-rich phase were produced during the film casting. The mechanical property was significantly enhanced by the incorporation of PVC into the electrolyte system. The ionic conductivity decreased with increasing the PVCjPMMA ratio and increased with increasing the plasticizer content. These behaviors were explained in terms of the morphology of the film. Since the plasticizer-rich phase contains much more plasticizer than the PVC-rich phase, the ions preferentially move through plasticizer-rich phase. Due to the slow ionic transport through the PVC-rich phase, the conductivity decreased with increasing PVCjPMMA ratio.
๐ SIMILAR VOLUMES
The majority of investigations carried out on polymer-salt systems have been on polyether electrolytes a t moderate temperatures where such electrolytes exhibit macroscopic uniformity. Relatively little attention has been paid to the subambient temperature region where composite electrolytes based o