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Characterization of ion-conductive Behaviors for Crystalline/Amorphous Solid Polyether Electrolytes Using Supercritical $CO_2$ Fluid  

Y. Tominaga (동경공업대학 물질과학과)
S. Asai (동경공업대학 물질과학과)
M. Sumita (동경공업대학 물질과학과)
Publication Information
Polymer(Korea) / v.26, no.6, 2002 , pp. 785-791 More about this Journal
Abstract
The effect of the supercritical carbon dioxide (sc$CO_2$) on ion-conductive behaviors for polyether electrolytes based on, both poly (ethylene oxide) (PEO) and poly [oligo (oxyethylene glycol) methacrylate] (PMEO) with lithium triflate, LiCF$_3$SO$_3$, has been investigated. In particular, the present research is a new concept for improving the ionic conductivity of polyether electrolytes. The maximum ionic conductivity ($\sigma$$_{max}$) at room temperature of the PEO electrolyte was more than 100 times higher, and the $\sigma$$_{max}$ at 9$0^{\circ}C$ of the PMEO electrolyte was 30 times improved by the se$CO_2$ treatment, respectively. It was revealed that the penetration of $CO_2$ molecules into the polymer matrix causes the increase of carrier ions by ion-dispersion effect and the decrease of glass transition temperature (T$_{g}$) by plasticizing effect that results in the improvement of the ion transport behaviors.viors.
Keywords
poly(ethylene oxide); poly [oligo(oxyethylene glycol) methacrylate]; supercritical $CO_2$; ionic conductivity; Raman spectroscopy;
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