A Class of Sodium Transition-Metal Sulfide Cathodes With Anion Redox
© 2024 Wiley‐VCH GmbH.
| Veröffentlicht in: | Advanced materials (Deerfield Beach, Fla.). - 1998. - 36(2024), 33 vom: 16. Aug., Seite e2403521 |
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| Weitere Verfasser: | , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2024
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| Zugriff auf das übergeordnete Werk: | Advanced materials (Deerfield Beach, Fla.) |
| Schlagworte: | Journal Article anion redox cathode electrochemistry sodium transition‐metal sulfide sodium‐ion batteries |
| Zusammenfassung: | © 2024 Wiley‐VCH GmbH. Sodium-ion batteries (SIBs) are entering commercial relevance as a sustainable and low-cost alternative to lithium-ion batteries. Improving the energy density of SIBs is critical to enable their widespread adoption. Here, a new class of cathode materials Na6MS4 (M = Co, Mn, Fe, and Zn) that exhibit high charge-storage capacity is reported. Using Na6CoS4 as a prototypical example, a six-electron conversion reaction dominated by anion redox is observed, confirmed through various electrochemical and spectroscopic techniques. After the initial cycle, Na6CoS4 delivers a high capacity of 392 mA h g-1 with a long lifespan of over 500 cycles. The reaction involves, initially, the transformation of crystalline Na6CoS4 to a nearly amorphous structure consisting of mainly CoS and sulfur nanoparticles, which then reversibly cycles between nearly amorphous a-CoS/S and a-Na6CoS4. Such anion-redox-driven conversion-type cathodes hold the potential to enable energy-dense, stable SIBs |
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| Beschreibung: | Date Revised 15.08.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202403521 |