Abstract
In order to improve the electrochemical properties including ionic conductivity of SPEs (solid polymer electrolytes), understanding of the interaction between the polymer and salt in the SPE is important. In this study, four types of polymer matrices and four types of salts were used according to the hard/soft acid base (HSAB) principle. The results of impedance measurement reveal that the ionic conductivities are affected by the HSAB principle at low salt concentration. With increasing salt content, however, the SPEs are influenced by the ion hopping property of salt rather than by the solubility of the polymer with salt. In contrast, the PPS-based SPE shows different characteristics because it is prepared as a slurry phase at high salt content.
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