Thermal and Electrical Properties of Poly(vinylidene fluoride-hexafluoropropylener)-Based Proton Conducting Gel-Electrolytes

Poly(vinylidene fluoride-hexafluoropropylene)계 양성자 전도성 겔-전해질의 열적, 전기적 특성

  • 최병구 (단국대학교 응용물리학과) ;
  • 박상희 (단국대학교 응용물리학과)
  • Published : 2002.03.01

Abstract

Polymer electrolyte films consisting of poly (vinylidenefluoride-hexafluoro-propylene) (PVdF-HFP) $H_3PO_4$and a mixture of ethylene carbonate(EC), $\gamma$-butyrolactone(BL) and dimethylcarbonate (DMC) were examined in order to obtain the best compromise between high protonic conductivity, homogeniety and dimensional stability. Measurements of differential scanning calorimetry and ionic conductivity have been carried out for various compositions. The highest proton conductivity of 7.3 $\times$$10^{-3}Sm^{-1}$ at $30^{\circ}C$ were obtained for a film of 30(PVdF-HFP) + 50EC/DMC + 20H$_3$PO$_4$. From the thermal study, it has been found that the PVdF-HFP gels are stable up to $80^{\circ}C$, and the $H_3PO_4$ enhances the miscibility of the polymer and the solvent by interacting sensitively with polymer segments.

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