Studies on cross-linked polyurethane acrylate-based electrolyte consisting of reactive vinyl/divinyl diluents |
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Authors: | ML DigarSL Hung TC Wen |
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Affiliation: | Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan, ROC |
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Abstract: | A series of cross-linked polyurethane acrylate (PUA) electrolytes have been prepared by using 4,4′-methylene bis(phenyl isocyanate), polyethylene glycol, hydroxyethyl methacrylate and different reactive vinyl/divinyl diluents, such as methyl methacrylate (MMA), ethyl acrylate and acrylonitrile, tripropylene glycol diacrylate (TPGDA). The electrolytes were prepared by UV radiation induced cross-linking of the PUA-diluent mixture followed by swelling in a liquid electrolyte (LP-30). Depending upon the composition of the components, these electrolytes exhibited a wide range of mechanical and electrical properties. The system containing MMA as reactive diluent showed highest conductivity, but poor mechanical properties and stability in the liquid electrolyte. The TPGDA cross-linked system possesses a good combination of ionic conductivity and stability in liquid electrolytes. These systems showed good compatibility with Li-electrodes and sufficient electrochemical stability to allow safe operation in rechargeable Li-batteries. |
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Keywords: | Polymer electrolyte Polyurethane acrylate Vinyl diluents |
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