KIT | KIT-Bibliothek | Impressum | Datenschutz

Locally Concentrated Ionic Liquid Electrolyte with Partially Solvating Diluent for Lithium/Sulfurized Polyacrylonitrile Batteries

Liu, Xu 1; Diemant, Thomas 1; Mariani, Alessandro 1; Dong, Xu 1; Di Pietro, Maria Enrica; Mele, Andrea; Passerini, Stefano 1
1 Helmholtz-Institut Ulm (HIU), Karlsruher Institut für Technologie (KIT)

Abstract:

The development of Li/sulfurized polyacrylonitrile (SPAN) batteries requires electrolytes that can form stable electrolyte/electrode interphases simultaneously on lithium-metal anodes (LMAs) and SPAN cathodes. Herein, a low-flammability locally concentrated ionic liquid electrolyte (LCILE) employing monofluorobenzene (mFBn) as the diluent is proposed for Li/SPAN cells. Unlike non-solvating diluents in other LCILEs, mFBn partially solvates Li+, decreasing the coordination between Li+ and bis(fluorosulfonyl)imide (FSI). In turn, this triggers a more substantial decomposition of FSI and consequently results in the formation of a solid electrolyte interphase (SEI) rich in inorganic compounds, which enables a remarkable Coulombic efficiency (99.72%) of LMAs. Meanwhile, a protective cathode electrolyte interphase (CEI), derived mainly from FSI and organic cations, is generated on the SPAN cathodes, preventing the dissolution of polysulfides. Benefiting from the robust interphases simultaneously formed on both the electrodes, a highly stable cycling of Li/SPAN cells for 250 cycles with a capacity retention of 71% is achieved employing the LCILE and only 80% lithium-metal excess.

Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 0935-9648, 1521-4095
KITopen-ID: 1000153036
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Advanced Materials
Verlag John Wiley and Sons
Band 34
Heft 49
Seiten Art.-Nr.: 2207155
Vorab online veröffentlicht am 31.10.2022
Schlagwörter ionic liquids, lithium-metal anodes, locally concentrated electrolytes, sulfurized polyacrylonitrile
Nachgewiesen in Web of Science
OpenAlex
Scopus
Dimensions
Globale Ziele für nachhaltige Entwicklung Ziel 6 – Sauberes Wasser und Sanitär-Einrichtungen

Verlagsausgabe §
DOI: 10.5445/IR/1000153036
Veröffentlicht am 25.11.2022
Originalveröffentlichung
DOI: 10.1002/adma.202207155
Scopus
Zitationen: 37
Web of Science
Zitationen: 30
Dimensions
Zitationen: 40
Seitenaufrufe: 82
seit 25.11.2022
Downloads: 61
seit 04.12.2022
Cover der Publikation
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page