KIT | KIT-Bibliothek | Impressum | Datenschutz

Influence of the Cation on the Reaction Mechanism of Sodium Uptake and Release in Bivalent Transition Metal Thiophosphate Anodes: A Case Study of Fe2P2S6

van Dinter, Jonas; Indris, Sylvio ORCID iD icon 1; Etter, Martin; Cibin, Giannantonio; Bensch, Wolfgang
1 Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS), Karlsruher Institut für Technologie (KIT)

Abstract:

The layered active material Fe2P2S6 was examined as anode material in sodium-ion batteries (SIBs) and compared to previously investigated Ni2P2S6. A reversible specific capacity of 540 mAh g1 was achieved after 250 cycles, depicting similar electrochemical performance as observed for Ni2P2S6. The rate capability and long-term behavior of these two materials are also very similar. Another objective was to elucidate the reaction mechanism during discharging and charging by applying several techniques such as X-ray diffraction, pair distribution function analysis as well as X-ray absorption and solid state NMR spectroscopy. The results clearly demonstrate that the majority of Fe2+ is reduced to elemental Fe during the uptake of 5 Na/f.u., while an amorphous intermediate is generated, which was identified as Na4P2S6 by solid state NMR spectroscopy. Completely discharging against a Na metal counter electrode leads to the formation of nanocrystalline Na2S and indications of the formation of polymeric phosphorus were found. In sum, the Na uptake reaction process observed for Fe2P2S6 coincides with the previously unraveled reaction pathway of Ni2P2S6. ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 15.11.2022
Sprache Englisch
Identifikator ISSN: 0044-2313, 0372-7874, 0863-1778, 0863-1786, 1521-3749
KITopen-ID: 1000151914
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Zeitschrift für anorganische und allgemeine Chemie
Verlag John Wiley and Sons
Band 641
Heft 21
Seiten Art.Nr. e202200227
Vorab online veröffentlicht am 26.09.2022
Schlagwörter electrochemistry, Fe2P2S6, reaction mechanism, sodium-ion battery, sodium uptake
Nachgewiesen in Web of Science
Scopus
Dimensions
OpenAlex
Globale Ziele für nachhaltige Entwicklung Ziel 6 – Sauberes Wasser und Sanitär-EinrichtungenZiel 7 – Bezahlbare und saubere Energie

Verlagsausgabe §
DOI: 10.5445/IR/1000151914
Veröffentlicht am 26.10.2022
Seitenaufrufe: 64
seit 26.10.2022
Downloads: 46
seit 06.11.2022
Cover der Publikation
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page