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

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

doi:10.1002/open.201900313

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

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

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	1429-1436
Number of pages	8
Journal	ChemistryOpen
Volume	8
Issue number	12
DOIs	https://doi.org/10.1002/open.201900313
Publication status	Published - 1 Dec 2019

Keywords

flexible polymers
gel electrolyte membranes
germanium anodes
ionic liquids
lithium-ion batteries

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title = "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.",

keywords = "flexible polymers, gel electrolyte membranes, germanium anodes, ionic liquids, lithium-ion batteries",

author = "McGrath, {Louise M.} and John Jones and Edwin Carey and Rohan, {James F.}",

note = "Publisher Copyright: {\textcopyright} 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.",

year = "2019",

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doi = "10.1002/open.201900313",

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TY - JOUR

T1 - Ionic Liquid Based Polymer Gel Electrolytes for Use with Germanium Thin Film Anodes in Lithium Ion Batteries

AU - McGrath, Louise M.

AU - Jones, John

AU - Carey, Edwin

AU - Rohan, James F.

PY - 2019/12/1

Y1 - 2019/12/1

N2 - 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.

AB - 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.

KW - flexible polymers

KW - gel electrolyte membranes

KW - germanium anodes

KW - ionic liquids

KW - lithium-ion batteries

UR - http://www.scopus.com/inward/record.url?scp=85077394630&partnerID=8YFLogxK

U2 - 10.1002/open.201900313

DO - 10.1002/open.201900313

M3 - Article

SN - 2191-1363

VL - 8

SP - 1429

EP - 1436

JO - ChemistryOpen

JF - ChemistryOpen

IS - 12

ER -

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

Abstract

Keywords

UN SDGs

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