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Current Topics in Electrochemistry   Volumes    Volume 10 
Ionic conductivity in chitosan-based membranes and application in electrochemical cells
A. K. Arof, Z. Osman, M. Z. A. Yahya
Pages: 51 - 62
Number of pages: 12
Current Topics in Electrochemistry
Volume 10 

Copyright © 2004 Research Trends. All rights reserved


Chitosan-salt complexes have been prepared by the solution cast technique.  Fourier transform infrared spectroscopy shows that the salt and polymer has formed a complex. The room temperature electrical conductivity as measured by impedance spectroscopy shows that a chitosan acetate film has a conductivity of ~10-10 S cm-1.  LiTf (LiCF3SO3) salted chitosan acetate samples exhibit electrical conductivity of ~10-6 S cm-1. Electrical conductivity can be increased by plasticization.  To date plasticizers such as ethylene carbonate (EC), propylene carbonate (PC), palmitic (PA) and oleic acids (OA) have been tried.  Electrical modulus-frequency calculations have shown peaks that also indicate these materials to be ionic conductors.  The ln sT versus 103/T plots show that the conductivity-temperature relationship obeys an Arrhenian relationship implying that the conductivity is thermally assisted.  The properties of electrochemical cells using such complexes as electrolytes and lithium transition metal oxides as the cathode active material will be presented.

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