Abstract
A gel polymer electrolyte (FGPE) based on a perfluoropolyether (PFPE) crosslinker and liquid state PFPE doped with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is prepared, and its characteristics including ionic conductivities, Li+ transference numbers, and thermal/electrochemical stabilities are investigated. A commercial PFPE-dimethacrylate, Fluorolink MD700®, is found to be a suitable crosslinker for the FGPE preparation due to its good miscibility with the PFPE/LiTFSI electrolytes. The ionic conductivity and Li+ transference number of the FGPE at 60°C are 1.72×10−5Scm−1, and 0.53, respectively. The FGPE is nonflammable, thermally stable up to 175°C without any weight loss, and has a wide electrochemical stability window (∼5.0V vs. Li/Li+). Therefore, the FGPE is expected to be a promising electrolyte candidate for safety-reinforced high-temperature lithium batteries.
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