Ionic liquid based polymer gel electrolytes for use with germanium thin film anodes in lithium ion batteries

McGrath, Louise M.; Jones, John; Carey, Edwin; Rohan, James F.

Ionic liquid based polymer gel electrolytes for use with germanium thin film anodes in lithium ion batteries

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Files

open.201900313.pdf(1.86 MB)

Published version

Date

2019-12-13

Authors

McGrath, Louise M.

Jones, John

Carey, Edwin

Rohan, James F.

Publisher

Wiley

Published Version

10.1002/open.201900313

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.

Keywords

Flexible polymers , Gel electrolyte membranes , Germanium anodes , Ionic liquids , Lithium-ion batteries

Citation

McGrath, L. M., Jones, J., Carey, E. and Rohan, J. F. (2019) 'Ionic Liquid Based Polymer Gel Electrolytes for Use with Germanium Thin Film Anodes in Lithium Ion Batteries', ChemistryOpen, 8(12), pp. 1429-1436. doi: 10.1002/open.201900313