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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

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

McGrath Louise M LM Jones John J Carey Edwin E Rohan James F JF

ChemistryOpen 20191213 12

Thermally stable, flexible polymer gel electrolytes with high ionic conductivity are prepared by mixing the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (C<sub>4</sub>mpyrTFSI), LiTFSI and poly(vinylidene difluoride-co-hexafluoropropylene (PVDF-HFP). FT-IR and Raman spectroscopy show that an amorphous film is obtained for high (60 %) C<sub>4</sub>mpyrTFSI contents. Thermogravimetric analysis (TGA) confirms that the polymer gels are stable below ∼300 °C in both nit ...[more]

PMID: 31867151

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