Ionic Liquid Based Polymer Gel Electrolytes for Use with Germanium Thin Film Anodes in Lithium Ion Batteries.

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.

SUBMITTER: McGrath LM 

PROVIDER: S-EPMC6909880 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature