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Polymerized ionic liquids with guanidinium cations as host for gel polymer electrolytes in lithium metal batteries
Author(s) -
Li Mingtao,
Yang Li,
Fang Shaohua,
Dong Siming,
Hirano Shinichi,
Tachibana Kazuhiro
Publication year - 2012
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.3181
Subject(s) - electrolyte , ionic liquid , lithium (medication) , ionic conductivity , electrochemistry , inorganic chemistry , electrochemical window , polymerization , polymer , chemistry , polymer chemistry , monomer , materials science , organic chemistry , electrode , catalysis , medicine , endocrinology
Polymerized ionic liquids (PILs) having guanidinium cations with different counter‐anions, such as PF 6 − and N(CF 3 SO 2 ) 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 SiO 2 , 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/LiFePO 4 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