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Synthesis, structure, and sodium mobility of sodium vanadium nitridophosphate : A zero-strain and safe high voltage cathode material for sodium-ion batteries

Zhang, Huang 1; Buchholz, Daniel 1; Passerini, Stefano 1
1 Karlsruher Institut für Technologie (KIT)


Herein, the nitridophosphate Na₃V(PO₃)₃N is synthesized by solid state method. X-ray diffraction (XRD) and Rietveld refinement confirm the cubic symmetry with P2₁3 space group. The material exhibits very good thermal stability and high operating voltage of 4.0 V vs. Na/Na+ due to V$^{3+}$/V$^{4+}$ redox couple. In situ X-ray diffraction studies confirm the two-phase (de-)sodiation process to occur with very low volume changes. The refinement of the sodium occupancies reveal the low accessibility of sodium cations in the Na2 and Na3 sites as the main origin for the lower experimental capacity (0.38 eq. Na⁺, 28 mAh g$^{-1}$) versus the theoretical one (1.0 eq. Na⁺, 74 mAh g$^{-1}$). These observations provide valuable information for the further optimization of this materials class in order to access their theoretical electrochemical performance as a potentially interesting zero-strain and safe high-voltage cathode material for sodium-ion batteries

Volltext §
DOI: 10.5445/IR/1000072983
DOI: 10.3390/en10070889
Zitationen: 20
Web of Science
Zitationen: 19
Zitationen: 23
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 1996-1073
KITopen-ID: 1000072983
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in Energies
Verlag MDPI
Band 10
Heft 7
Seiten Art. Nr. 889
Schlagwörter sodium-ion battery, cathode, Na₃V(PO₃)₃N, high voltage, safety
Nachgewiesen in Scopus
Web of Science
Globale Ziele für nachhaltige Entwicklung Ziel 7 – Bezahlbare und saubere Energie
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