Abstract:
In this work, 2 types of solid polymer electrolyte films containing chitosan/PEO
(20:80 w/w) and (80:20 w/w) added with LiCF3S03 as salt varied from 5 to 50wt.%
were prepared by solution casting technique. The hiF,er conductivity at room
temperature was 1.03 x 10-Scm- for the sample containing
chitosan/PEO (20:80 w/w)/ LiCF3S03 (30 wt.%) and chitosan/PEO (80:20 w/w)/
LiCF3S03 (40 wt.%) respectively. The Fourier Transform Infrared (FTIR)
Spectroscopy clearly shows the presence of ionic conductors at 1033 and 1153 cm-5 1 Scm-6
and 7.38 x 10-1 due to the symmetric vibration mode of S03, V8(S03) and asymmetric vibration mode
of S03, Vas(S03). The electrical study was performed in order to investigate the
behavior of the polymer electrolyte. The dielectric constant, eR shows the same
behaviors for all of the sample studied. The dielectric constant represents the
fractional increase on the stored energy per unit voltage i.e. fractional increase in
charge. The dielectric loss, e1 was calculated from impedance and frequency data.
Dielectric loss rise sharply at low frequencies indicating that electrode polarization
and space charge effects have occurred confirming non-Debye dependence. The real
electrical modulus, MR was calculated. From the real electrical modulus versus
frequency plot, it can be observe that there is a long tails exhibited at the lower
frequency. The long tail future is be characteristic of a highly capacitive material. In
order to prove this material is a Lt conductor in a necessary to show the vibration
mode of CF3- and S03-.
