Polymerized ionic liquids with guanidinium cations as host for gel polymer electrolytes in lithium metal batteries |
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| Authors: | Mingtao Li Li Yang Shaohua Fang Siming Dong Shin‐ichi Hirano Kazuhiro Tachibana |
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| Affiliation: | 1. School of Chemistry and Chemical Technology, Shanghai Jiaotong University, Shanghai 200240, China;2. Hirano Institute for Materials Innovation, Shanghai Jiaotong University, Shanghai 200240, China;3. Department of Chemistry and Chemical Engineering, Faculty of Engineering, Yamagata University, Yamagata 992‐8510, Japan |
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| Abstract: | Polymerized ionic liquids (PILs) having guanidinium cations with different counter‐anions, such as PF6? and N(CF3SO2)2? (TFSI?), were synthesized by copolymerization of a guanidinium ionic liquid monomer with methyl acrylate followed by an anion exchange reaction. Furthermore, incorporating a guanidinium ionic liquid, LiTFSI salt and nano‐size SiO2, a quaternary gel polymer electrolyte based on one of the PILs as the polymer host was prepared. The quaternary gel polymer electrolyte was chemically stable even at a higher temperature of 80 °C in contact with the lithium anode. In particular, the electrolyte exhibited high lithium ion conductivity, wide electrochemical stability window and good lithium stripping/plating performance. Li/LiFePO4 batteries with the quaternary gel polymer electrolyte at 80 °C had capacities of 140 and 130 mA h g?1 respectively at 0.1 and 0.2 C current rates. Copyright © 2011 Society of Chemical Industry |
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| Keywords: | polymerized ionic liquids ionic conductivity lithium polymer batteries guanidinium‐based ionic liquids |
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