Ionic Liquid Based Polymer Gel Electrolytes for Use with Germanium Thin Film Anodes in Lithium Ion Batteries |
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| Authors: | Louise M McGrath John Jones Dr Edwin Carey Dr James F Rohan |
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| Institution: | 1. Electrochemical Materials and Energy Group Tyndall National Institute, University College Cork, Lee Maltings, T12 R5CP Cork, Ireland;2. Process Analytical Technology Lab, TU Dublin – Tallaght Campus, Blessington Rd, Tallaght, D24 FKT9 Dublin, Ireland |
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| Abstract: | Thermally stable, flexible polymer gel electrolytes with high ionic conductivity are prepared by mixing the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (C4mpyrTFSI), LiTFSI and poly(vinylidene difluoride-co-hexafluoropropylene (PVDF-HFP). FT-IR and Raman spectroscopy show that an amorphous film is obtained for high (60 %) C4mpyrTFSI contents. Thermogravimetric analysis (TGA) confirms that the polymer gels are stable below ～300 °C in both nitrogen and air environments. Ionic conductivity of 1.9×10?3 S cm?2 at room temperature is achieved for the 60 % ionic liquid loaded gel. Germanium (Ge) anodes maintain a coulombic efficiency above 95 % after 90 cycles in potential cycling tests with the 60 % C4mpyrTFSI polymer gel. |
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| Keywords: | flexible polymers gel electrolyte membranes germanium anodes ionic liquids lithium-ion batteries |
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