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Nonfluorinated Ionic Liquid Electrolytes for Lithium Metal Batteries: Ionic Conduction, Electrochemistry, and Interphase Formation

Karimi, N.; Zarrabeitia, M.; Mariani, A.; Gatti, D.; Varzi, A.; Passerini, S.

Abstract (englisch):
Cyano-based ionic liquids (ILs) are prime candidates for the manufacturing of cheaper and safer batteries due to their inherently low-volatility and absence of expensive fluorinated species. In this work, N-methyl-N-butylpyrrolidinium (Pyr14)-based ILs featuring two different cyano-based anions, i.e., dicyanamide (DCA) and tricyanomethanide (TCM), and their mixture with the respective Li salts (1:9 salt:IL mole ratio), alongside their combination (DCA–TCM), are evaluated as potential electrolytes for lithium metal batteries (LMBs). The electrolytes display significant ionic conductivity at room temperature (5 mS cm−1) alongside an electrochemical stability window up to 4 V, suitable for low-voltage LMBs such as Li–sulfur, as well as promising cycling stability. In addition to the detailed physicochemical (viscosity, conductivity) and electrochemical (electrochemical stability window, stripping/plating, and impedance test in symmetrical Li cells) characterization, the solid electrolyte interphase (SEI) formed in this class of ionic liquids is studied for the first time. X-ray photoelectron spectroscopy (XPS) provides evidence for an SEI dominated by a polymer-rich layer including carbon–nitrogen single, double, and triple bonds, which provides high ionic conductivity and mechanical stability, leading to the aforementioned cycling stability. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000128215
Veröffentlicht am 18.01.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Center for Electrochemical Energy Storage Ulm & Karlsruhe (CELEST)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 27.01.2021
Sprache Englisch
Identifikator ISSN: 1614-6832, 1614-6840
KITopen-ID: 1000128215
Erschienen in Advanced energy materials
Verlag Wiley-VCH Verlag
Band 11
Heft 4
Seiten Art. Nr.: 2003521
Vorab online veröffentlicht am 21.12.2020
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