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Solvent-Dictated Sodium Sulfur Redox Reactions: Investigation of Carbonate and Ether Electrolytes

Zhang, Huang; Diemant, Thomas; Qin, Bingsheng; Li, Huihua; Behm, R. Jürgen; Passerini, Stefano

Abstract:
Sulfur-based cathode chemistries are essential for the development of high energy density alkali-ion batteries. Here, we elucidate the redox kinetics of sulfur confined on carbon nanotubes, comparing its performance in ether-based and carbonate-based electrolytes at room temperature. The solvent is found to play a key role for the electrochemical reactivity of the sulfur cathode in sodium–sulfur (Na–S) batteries. Ether-based electrolytes contribute to a more complete reduction of sulfur and enable a higher electrochemical reversibility. On the other hand, an irreversible solution-phase reaction is observed in carbonate solvents. This study clearly reveals the solvent-dependent Na–S reaction pathways in room temperature Na–S batteries and provides an insight into realizing their high energy potential, via electrolyte formulation design.

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Originalveröffentlichung
DOI: 10.3390/en13040836
Scopus
Zitationen: 1
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1996-1073
KITopen-ID: 1000118921
Erschienen in Energies
Band 13
Heft 4
Seiten Art. Nr.: 836
Vorab online veröffentlicht am 14.02.2020
Schlagwörter sodium-sulfur, redox kinetics, carbonate, ether, electrolyte
Nachgewiesen in Scopus
Web of Science
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