Journal
ELECTROCHIMICA ACTA
Volume 53, Issue 4, Pages 1512-1517Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2007.05.079
Keywords
composite gel electrolyte; super acid on Al2O3 or TiO2 fillers; ionic conductivity; interfacial stability; transference number
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Gel polymer electrolyte membranes composed of poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) and surface modified aluminum or titanium oxide were prepared according to the so-called Bellcore process. Modifications were done by impregnating ceramic powder with 1-8% sulphuric acid aqueous solutions. Filler grain size varied from 10 to 12 mu m. The membranes were conditioned in liquid electrode-1 mol/1 LiClO4 in PC. The ionic conductivity of polymer membrane increased by more than one order of magnitude upon the addition of filler into polymer host. For electrolyte membrane containing modified aluminum or titanium oxide, the interfacial resistance is stable in time as opposed to unmodified gel electrolytes. An increase in lithium transference number is observed upon the addition of filler. Lithium transference number also increases with the fraction of acidic surface groups. (c) 2007 Elsevier Ltd. All rights reserved.
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