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NTIS 바로가기Journal of the Electrochemical Society : JES, v.136 no.5, 1989년, pp.1260 - 1265
Huq, Rokeya (Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104) , Saltzberg, Michael A. (Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104) , Farrington, Gregory C. (Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104)
Solid polymeric electrolytes formed by dissolving salts of Ni2+<> and Co2+ in poly(ethylene oxide) (PEO) are strikingly different in their response to deliberate hydration/dehydration. Both PEO8<>NiBr2 and PEO16<>CoBr2 readily absorb about 28-30 molecules of water per cation from humid nitrogen at room temperature. Surprisingly, an anhydrous sample of PEO8<>NiBr2 after having been hydrated and dehydrated has a much higher conductivity [10-3<>(Ω-1 cm-1<>) at 150°C] than in the initial as-cast anhydrous state [10-6<>(Ω-1cm-1<>) at 150°C]. This unexpected effect of hydrationdehydration is not observed with samples of PEO16<>CoBr2. UV-visible absorption spectroscopy shows that Ni2+<> in dry PEO8NiBr2<> exists in a variety of square planar and tetrahedral complexes with PEO. The hydration of PEO8NiBr2<> completely frees Ni2+ ions from association with the PEO chains and results in the formation of [Ni(H2<>O)6]2+<> species. In contrast, absorption of water does not appear to liberate Co2+ ions from association with PEO and has no persistent effect on the properties of the electrolyte.(Author abstract)
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