An investigation of PEO/chitosan based blend electrolytes in lithium battery application : type II

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-.