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

Rauber, Daniel; Hofmann, Andreas 1; Philippi, Frederik; Kay, Christopher W. M.; Zinkevich, Tatiana 2; Hanemann, Thomas 1; Hempelmann, Rolf
1 Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Karlsruher Institut für Technologie (KIT)
2 Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

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. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000134211
Veröffentlicht am 21.06.2021
DOI: 10.3390/app11125679
Zitationen: 3
Web of Science
Zitationen: 3
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Post Lithium Storage (POLiS)
Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2076-3417
KITopen-ID: 1000134211
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Applied Sciences
Verlag MDPI
Band 11
Heft 12
Seiten 5679
Vorab online veröffentlicht am 19.06.2021
Schlagwörter ionic liquids; ammonium; batteries; electrolytes
Nachgewiesen in Dimensions
Web of Science
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