Data for: Flexible polymer gel electrolytes for use with germanium thin film anodes in lithium ion batteries

Published: 27-05-2020| Version 1 | DOI: 10.17632/287sy7dp96.1
J.F. Rohan,
John Jones,
Louise McGrath,
Edwin Carey


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 N2 and air environments. Ionic conductivity of 1.9x10-3 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.