Resumo

JURADO, Nori M; DELGADO, I  e  VARGAS, R. A. Ionic conductivity of (PEO)₁₀(CF₃COONa)-X % Al₂O₃ composites. Univ. Sci. [online]. 2013, vol.18, n.2, pp.173-180. ISSN 0122-7483.

To increase the ionic conductivity of solid polymer electrolyte, (PEO)₁₀CF₃COONa, we formed new composites by adding alumina particles as a filler. We prepared these composites by dissolving them in a liquid solvent, and characterized them through impedance spectroscopy (IS), using a Pt/electrolyte/Pt electrode configuration. The combination of polyethylene oxide (PEO) with sodium trifluoroacetate (CF₃COONa) produced a reduction in resistance of up to two orders of magnitude in Nyquist plots, and up to three orders of magnitude when we added AUO3 particles at room temperature. DC conductivity concentration graphs show an increase in the ionic conductivity with low alumina concentrations. The new synthesized ionic conductor composite presented conductivity values of 2.00x10^-5 Scm^-1 at room temperature and of 7.70x10^-4 Scm^-1 at a temperature of 383 K. Two sections of the conductivity diagrams also evidenced a temperature induced Arrhenius behavior, indicating a thermally activated process. Higher concentrations of AbO3 induced a Vogel-Tamman-Fulcher (VTF) behavior. Conductivity variations produced by AUO3 concentration are linked to the number of sites involved in ion transport between AbO3 ionic electrolyte species through Lewis acid-base interactions.

Palavras-chave : Solid electrolytes; impedance spectroscopy; composites; polymer.

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