Interaction between electrolytes and Sb2O3‐based electrodes in sodium batteries: uncovering the detrimental effects of diglyme
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 Sb2O3 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 Sb2O3 electrode. Sb2O3 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 Sb2O3 during cycling. Diglyme has the ability to coordinate and extract Sb3+ during the oxidation of Sb2O3. This leads to contaminations of all cell components and a strong capacity loss together with an irregular electrochemical signature. Due to its poor reactivity at low potentials, diglyme forms a thin or even no surface layer. Thereby, there are no protecting films on the Sb2O3 electrodes that can avoid Sb3+ ion dissolution. A critical examination of the electrolyte solutions components’ impact is essential to match them with conversion reaction anodes
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Notes
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ISSN: 2196-0216
- Classification
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Physik
- Event
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Veröffentlichung
- (where)
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Freiburg
- (who)
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Universität
- (when)
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2024
- Creator
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Pfeifer, Kristina
Greenstein, Miryam Fayena
Aurbach, Doron
Luo, Xianlin
Ehrenberg, Helmut
Dsoke, Sonia
- DOI
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10.1002/celc.202000894
- URN
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urn:nbn:de:bsz:25-freidok-2438498
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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25.03.2025, 1:43 PM CET
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Associated
- Pfeifer, Kristina
- Greenstein, Miryam Fayena
- Aurbach, Doron
- Luo, Xianlin
- Ehrenberg, Helmut
- Dsoke, Sonia
- Universität
Time of origin
- 2024
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