More studies on the PVOH-LiH2PO4 polymer system
Artikel i vetenskaplig tidskrift, 2007

Polymer electrolytes based on poly(vinyl alcohol) (PVOH) and lithium dihydrogen-phosphate (LiH2PO4) with molar ratio of x = 0.07, 0.10 and 0. 14 were prepared in order to investigate the mechanism of ionic motion. Admittance spectroscopy measurements were used to study electrical conductivity relaxation on both anhydrous and hydrated samples in the 5 Hz to 13 MHz frequency range and temperatures ranging from 25 to 150 degrees C. The conductance, G, shows dispersion above a crossover frequency, f(p). This behavior is typical of systems in which correlated ionic motions in the bulk material are responsible for ionic conductivity. For hydrated samples, results reveal that the temperature dependence of the dc-conductivity, sigma(0) and the characteristic frequency,f(p), shows Arrhenius-type behavior with the same energy, E-sigma. However, for anhydrous conductivity, a Vogel-Tamman-Fulcher (VTF) behavior is shown for both sigma(0)(T) and f(p)(7), with the same pseudo activation energy, B and B-sigma, respectively, thus indicating that they are correlated with chain mobility. (c) 2007 Published by Elsevier Ltd.

ac conductivity

SPECTRA

LICLO4

MEMBRANES

non-Debye relaxation

MECHANISMS

poly(vinyl alcohol)

ION-CONDUCTION

ELECTROLYTE

TRANSPORT

POLY(VINYL ALCOHOL)

COMPLEXES

SPECTROSCOPY

power law

Författare

V. H. Zapata

Universidad del Valle

W. A. Castro

Universidad del Valle

R. A. Vargas

Universidad del Valle

Bengt-Erik Mellander

Chalmers, Teknisk fysik, Fasta tillståndets fysik

Electrochimica Acta

0013-4686 (ISSN)

Vol. 53 4 1476-1480

Ämneskategorier

Annan teknik

DOI

10.1016/j.electacta.2007.05.063