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Polymer electrolyte for lithium batteries based on photochemically crosslinked poly(ethylene oxide) and ionic liquid |
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| Authors: | Barbara Rupp Andrea Balducci Martin Winter Wolfgang Kern |
| Affiliation: | a Institute of Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 16, A-8010 Graz, Austria b Institute of Physical Chemistry, Universität Münster, Corrensstrasse 28/30, D-48149 Münster, Germany c Institute of Chemistry of Polymeric Materials, University of Leoben, Franz-Josef-Strasse 18, A-8700 Leoben, Austria |
| Abstract: | Polymer/ionic liquid composites were investigated as solvent-free electrolytes for lithium batteries. Ternary electrolytes based upon poly(ethylene oxide), an ionic liquid and a conducting salt were UV crosslinked with benzophenone as the photoinitiator. Crosslinking leads to an increase in mechanical stability of the PEO composites. This straight-forward process provides a way to increase the content of ionic liquid and thus to raise ionic conductivity without loss of mechanical stability. Impedance measurements showed that the ionic conductivity of the composites is not affected by the UV curing process. Moreover, the UV curing process causes a decrease in the degree of crystallinity in the PEO composites which contributes to an increase in ionic conductivity. The present work is related to safety issues of lithium batteries. |
| Keywords: | Poly(ethylene oxide) Photo-crosslinking Polymer electrolyte Ionic liquid Lithium battery |
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