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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.18 [2011] >
IJEMS Vol.18(2) [April 2011] >
| Title: | Ionic conduction and relaxation processes in melt compounded poly(ethylene oxide)-lithium perchlorate trihydrate-montmorillonite nanocomposite electrolyte |
| Authors: | Choudhary, Shobhna
Sengwa, R J |
| Keywords: | Polymer nanocomposite electrolyte
Dielectric properties
PEO dynamics
Dielectric relaxation
Ionic conductivity |
| Issue Date: | Apr-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Polymer nanocomposite electrolyte (PNCE) films comprising
complexes of poly(ethylene oxide) (PEO) and lithium perchlorate trihydrate
(LiClO4·3H2O) filled with nano thickness platelets of
montmorillonite (MMT) clay up to 20 wt% concentration of PEO are synthesized by
melt compounding hot-pressed technique at 70oC and 105oC.
Complex dielectric function, electric modulus, alternating current electrical
conductivity and impedance behaviour of these PNCE films have been investigated
in the frequency range 20 Hz to 1 MHz at ambient temperature. The direct
current ionic conductivity of the PNCE films initially increases up to 2 wt%
MMT loading and vary anomalously at higher concentrations. The PNCE films
synthesized at 105oC have ionic conductivity nearly one order of
magnitude higher than that of synthesized at 70oC. Relaxation times
corresponding to electrode polarization and ionic conduction relaxation
processes in the PNCE films are determined from the values of peak frequencies
of the dielectric loss tangent and electric modulus loss spectra, respectively.
Results confirm that the ionic conductivity of the PNCE films are governed by
the PEO chain dynamics, electrode polarization and ionic conduction relaxation
times, and also the structures of dispersed exfoliated/intercalated MMT nano
platelets in PEO matrix and the material melt compounding temperature. |
| Page(s): | 147-156 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.18(2) [April 2011]
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