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Ionic conductivity of polymer gels deriving from alkali metal ionic liquids and negatively charged polyelectrolytes |
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| Authors: | Wataru Ogihara Maria Forsyth Masahiro Yoshizawa |
| Affiliation: | a Department of Biotechnology, Tokyo University of Agriculture and Technology, Nakacho 2-24-16, Koganei, Tokyo 184-8588, Japan b School of Materials Engineering, Monash University, Wellington Road, Clayton, Vic. 3800, Australia c School of Chemistry, Monash University, Wellington Road, Clayton, Vic. 3800, Australia |
| Abstract: | We have prepared polymer gel electrolytes with alkali metal ionic liquids (AMILs) that inherently contain alkali metal ions. The AMIL consisted of sulfate anion, imidazolium cation, and alkali metal cation. AMILs were mixed directly with poly(3-sulfopropyl acrylate) lithium salt or poly(2-acrylamido-2-methylpropanesulfonic acid) lithium salt to form polymer gels. The ionic conductivity of these gels decreased with increasing polymer fraction, as in general ionic liquid/polymer mixed systems. At low polymer concentrations, these gels displayed excellent ionic conductivity of 10−4 to 10−3 S cm−1 at room temperature. Gelation was found to cause little change in the  diffusion coefficient of the ionic liquid, as measured by pulse-field-gradient NMR. These data strongly suggest that the lithium cation migrates in successive pathways provided by the ionic liquids. |
| Keywords: | Ionic liquid Ionic conductivity Alkali metal ionic liquid Gel Polyelectrolyte |
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