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The Interaction Between Electrolytes and Sb2O3–based Electrodes in Sodium Batteries: Uncovering Detrimental Effects of Diglyme

Pfeifer, Kristina; Greenstein, Miryam Fayena; Aurbach, Doron; Luo, Xianlin; Ehrenberg, Helmut; Dsoke, Sonia

Abstract:
Conversion materials are promising to improve the energy density of sodium‐ion‐batteries (NIB). Nevertheless, they suffer from the drawback of phase transitions and pronounced volume changes during cycling, which causes cell instability. When using these types of electrodes, all cell‐components have to be adjusted. In this study, a tremendous influence of the electrolyte solution on Sb$_{2}$O$_{3}$ conversion electrodes for NIBs is discussed. Solutions based on three solvents and solvent combinations established for NIBs, ethylene carbonate/dimethyl carbonate (EC/DMC), EC/DMC+5 % fluoroethylene carbonate (FEC), and diglyme, lead to a massively divergent electrochemical behavior of the same Sb$_{2}$O$_{3}$ electrode. Sb$_{2}$O$_{3}$ demonstrates the highest stability in solutions containing FEC, because this component forms a flexible, protecting surface film that prevent disintegration. One key finding of this work is that electrolyte solutions based on ether solvents like diglyme can remove Sb‐ions from Sb$_{2}$O$_{3}$ during cycling. Diglyme has the ability to coordinate and extract Sb$^{3+}$ during the oxidation of Sb$_{2}$O$_{3}$. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000122152
Veröffentlicht am 10.12.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2196-0216, 2196-0216
KITopen-ID: 1000122152
HGF-Programm 37.01.12 (POF III, LK 01) Intercalation
Erschienen in ChemElectroChem
Verlag Wiley
Band 7
Heft 16
Seiten 3487-3495
Vorab online veröffentlicht am 21.07.2020
Nachgewiesen in Scopus
Web of Science
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