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Titel: Structure-Property Relation of Trimethyl Ammonium Ionic Liquids for Battery Applications
VerfasserIn: Rauber, Daniel
Hofmann, Andreas
Philippi, Frederik
Kay, Christopher W. M.
Zinkevich, Tatiana
Hanemann, Thomas
Hempelmann, Rolf
Sprache: Englisch
Titel: Applied Sciences
Bandnummer: 11
Heft: 12
Verlag/Plattform: MDPI
Erscheinungsjahr: 2021
Freie Schlagwörter: ionic liquids
ammonium
batteries
electrolytes
DDC-Sachgruppe: 540 Chemie
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: 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.
DOI der Erstveröffentlichung: 10.3390/app11125679
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-342574
hdl:20.500.11880/31450
http://dx.doi.org/10.22028/D291-34257
ISSN: 2076-3417
Datum des Eintrags: 28-Jun-2021
Bezeichnung des in Beziehung stehenden Objekts: Supplementary Materials
In Beziehung stehendes Objekt: https://www.mdpi.com/article/10.3390/app11125679/s1
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Chemie
Professur: NT - Prof. Dr. Christopher Kay
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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