Abstract
In order to increase ionic conductivity of solid electrolytes, structural design of some kinds of solvent-free polymer-alkali metal salt (M +K −) complexes was investigated. As the host polymer matrixes, oligo(ethylene oxide) graft copolymer (HPEO) and polyphosphazene (PP) derivatives were chosen, because the flexibility of poly(ethylene oxide) side chains would promote the higher ionic conductivity. Among complexes prepared, PP derivative-LiClo 4 complex showed highest conductivity, 3.5×10 −4 [S/cm] around room temperature. Also a single-ionic conducting only M + is mobile) polymer was realized as the result of copolymerization of p-styrenesulfonyl Li and HPEO. Its dc conductivity decayed only 10 % after applying dc 1 [V] for 24 hours, while the conductivity was relatively low.
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