Correlation between ionic and dipolar motions in a single-ion conducting polymer P[MEO9-MAM]

T. Fumkawa, K. Yoneya, Yoshiyuki Takahashi, K. Ito, H. Ohno

Research output: Contribution to journalConference article

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Broad-band dielectric and conductive spectroscopy covering a 10 mHz-10 MHz frequency range has been employed to examine both the ionic and dipolar motions in a single-ion conducting copolymer of nona-oxyethylene methacrylate and alkali-metal methacrylate, P(MEO9-MAM) with M = Li, Na, and K. Analysis of the observed spectra revealed an existence of three dielectric relaxation processes associated with the dipolar motions in the methacrylate main chains (α) and oxyethylene side chains (β,γ). On the low frequency side of the α process an additional process α′ was observed that was attributed to a local ionic fluctuation in a heterogeneous medium. Its relaxation frequency depended upon the ionic species and increased in the order of Li<Na<K in parallel with an increase of dc conductivity σdc. Comparing the temperature dependence of σdc and the relaxation frequencies of these processes, we conclude that the main-chain motion governs σdc through the dissociation of metal ions at low temperatures and spatial heterogeneity as well as the side-chain motion governs the ionic mobility at high temperatures.

Original languageEnglish
Pages (from-to)1443-1448
Number of pages6
JournalElectrochimica Acta
Issue number8
Publication statusPublished - 3 Jan 2000
EventProceedings of the 1998 6th International Symposium on Polymer Electrolytes (ISPE-6) - Hayama, Jpn
Duration: 1 Nov 19986 Nov 1998

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