GEL ELECTROLYTES PREPARED FROM OLIGO(ETHYLENE GLYCOL)DIMETHACRYLATE -GLASS-TRANSITION, CONDUCTIVITY AND LI-COORDINATION()

The influence of two plasticizers, propylene carbonate and dimethyl su lphoxide, as well as different salt concentrations of Li(TFSI), on pro perties of a polymer gel electrolyte material has been studied using d ifferential scanning calorimetry (DSC) and ac impedance and FTIR spect roscopy. Variations of glass transition temperature and the conductivi ty behaviours of the systems were examined, and found to be highly dep endent on the amount and type of the plasticizer used. Characteristic band-shifts in FTIR spectra, indicating coordination of lithium ions, have been found for the polymer and both the plasticizers in the corre sponding binary solutions. These shifts were used to study the coordin ation preferences in the complete ternary electrolyte system. The comb ined results from the three experimental techniques have been discusse d. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.