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Article

Structure-Property Relation of Trimethyl Ammonium Ionic Liquids for Battery Applications

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Department of Chemistry, Saarland University, Campus B2.2, 66123 Saarbrücken, Germany
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Karlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien–Werkstoffkunde (IAM-WK), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, London W12 0BZ, UK
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London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, UK
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Karlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien—Energiespeichersysteme (IAM-ESS), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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Institut für Mikrosystemtechnik, Universität Freiburg, Georges-Köhler-Allee 102, 79110 Freiburg, Germany
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Author to whom correspondence should be addressed.
Academic Editor: Oriele Palumbo
Appl. Sci. 2021, 11(12), 5679; https://doi.org/10.3390/app11125679
Received: 25 May 2021 / Revised: 11 June 2021 / Accepted: 15 June 2021 / Published: 19 June 2021
(This article belongs to the Special Issue Innovative Materials for Batteries)
Ionic liquids are attractive and safe electrolytes for diverse electrochemical applications such as advanced rechargeable batteries with high energy densities. Their properties that are beneficial for energy storage and conversion include negligible vapor-pressure, intrinsic conductivity as well as high stability. To explore the suitability of a series of ionic liquids with small ammonium cations for potential battery applications, we investigated their thermal and transport properties. We studied the influence of the symmetrical imide-type anions bis(trifluoromethanesulfonyl)imide ([TFSI]) and bis(fluorosulfonyl)imide ([FSI]), side chain length and functionalization, as well as lithium salt content on the properties of the electrolytes. Many of the samples are liquid at ambient temperature, but their solidification temperatures show disparate behavior. The transport properties showed clear trends: the dynamics are accelerated for samples with the [FSI] anion, shorter side chains, ether functionalization and lower amounts of lithium salts. Detailed insight was obtained from the diffusion coefficients of the different ions in the electrolytes, which revealed the formation of aggregates of lithium cations coordinated by anions. The ionic liquid electrolytes exhibit sufficient stability in NMC/Li half-cells at elevated temperatures with small current rates without the need of additional liquid electrolytes, although Li-plating was observed. Electrolytes containing [TFSI] anions showed superior stability compared to those with [FSI] anions in battery tests. View Full-Text
Keywords: ionic liquids; ammonium; batteries; electrolytes ionic liquids; ammonium; batteries; electrolytes
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MDPI and ACS Style

Rauber, D.; Hofmann, A.; Philippi, F.; Kay, C.W.M.; Zinkevich, T.; Hanemann, T.; Hempelmann, R. Structure-Property Relation of Trimethyl Ammonium Ionic Liquids for Battery Applications. Appl. Sci. 2021, 11, 5679. https://doi.org/10.3390/app11125679

AMA Style

Rauber D, Hofmann A, Philippi F, Kay CWM, Zinkevich T, Hanemann T, Hempelmann R. Structure-Property Relation of Trimethyl Ammonium Ionic Liquids for Battery Applications. Applied Sciences. 2021; 11(12):5679. https://doi.org/10.3390/app11125679

Chicago/Turabian Style

Rauber, Daniel, Andreas Hofmann, Frederik Philippi, Christopher W.M. Kay, Tatiana Zinkevich, Thomas Hanemann, and Rolf Hempelmann. 2021. "Structure-Property Relation of Trimethyl Ammonium Ionic Liquids for Battery Applications" Applied Sciences 11, no. 12: 5679. https://doi.org/10.3390/app11125679

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