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Can Metallic Sodium Electrodes Affect the Electrochemistry of Sodium‐Ion Batteries? Reactivity Issues and Perspectives

Pfeifer, Kristina; Arnold, Stefanie; Becherer, Julian; Das, Chittaranjan; Maibach, Julia; Ehrenberg, Helmut; Dsoke, Sonia

Sodium-ion-batteries (NIBs) are promising energy storage devices with advantages
like low cost and highly abundant raw materials. In order to probe the electrochemical
properties of NIBs, sodium metal is most frequently applied as reference and/or
counter electrode in state-of-the-art literature. However, the high reactivity of the
sodium metal and its impact on the electrochemical performance is usually neglected.
In our study, we demonstrate spontaneous reactions of sodium metal with organic
electrolytes and emphasize the importance of critical interpretation of electrochemical
experiments. When using sodium-metal half-cells, decomposition products
contaminate the electrolyte during the electrochemical measurement and can easily
lead to wrong conclusions on the stability of active materials. We prove that the cycling
stability is highly affected by these electrolyte contaminations by comparing sodium
metal free with sodium metal containing cells. Interestingly, a more stable cycling
performance of the Li4Ti5O12 half-cells can be observed when replacing the Na metal
counter and reference electrodes by activated carbon electrodes. ... mehr

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DOI: 10.1002/cssc.201901056
Zitationen: 4
Web of Science
Zitationen: 2
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Helmholtz-Institut Ulm (HIU)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 1864-5631, 1864-564X
KITopen-ID: 1000094206
Erschienen in ChemSusChem
Band 12
Heft 14
Seiten 3312-3319
Vorab online veröffentlicht am 02.05.2019
Schlagworte sodium-ion-batteries, post-lithium, electrolyte, sodium reactivity
Nachgewiesen in Web of Science
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