| 초록 |
Silver polymer electrolytes have been prepared by blending silver salt with poly((oxyethylene)9 methacrylate)-graft-poly(dimethyl siloxane), POEM-g-PDMS, confining silver salts within the continuous ion conducting POEM domains of microphase-separated graft copolymer. AgClO4 polymer electrolytes exhibit higher ionic conductivities and maximum conductivity at higher silver concentrations than AgCF3SO3 electrolytes. Upon the addition of salt in graft copolymer, the increase of Tg in AgClO4 is higher than that in AgCF3SO3 electrolytes. Analysis of extended configuration entropy model reveals that the interaction of ether oxygen/AgClO4 is stronger than that of ether oxygen/AgCF3SO3 whereas the interaction of Ag+/ClO4- is weaker than that of Ag+/CF3SO3-. It is attributed to the fact that silver salts are spatially, selectively incorporated in conducting POEM domains as free ions up to critical concentrations, after which they are distributed in both domains as ion pairs without selectivity. The increase of domain d-spacing in AgClO4 electrolytes is larger than AgCF3SO3, which again results from high concentrations of free ions in the former. |
