Impact of the F– for O2– substitution in Na3V2(PO4)2F3–yOy on their transport properties and electrochemical performance - Matériaux Hybrides et Nanomatériaux Accéder directement au contenu
Article Dans Une Revue ACS Applied Energy Materials Année : 2022

Impact of the F– for O2– substitution in Na3V2(PO4)2F3–yOy on their transport properties and electrochemical performance

Résumé

The series of polyanionic compounds Na3V 3+ 2-yV 4+ y(PO4)2F3-yOy (0 ≤ y ≤ 2) attracts much attention as positive electrode material for Na-ion batteries, because of its high operating potential and stable cycling performance. A series of nanospherical Na3V 3+ 2-yV 4+ y(PO4)2F3-yOy (NVPFOy) materials with y = 0.8, 1.35, 1.6 and 2 was synthesized using a solvothermal reaction and changes in the vanadium average oxidation state were fully characterized combining analyses by Raman and infrared spectroscopies and X-ray diffraction. Raman spectroscopy, beyond checking for the absence of a carbon coating, was in fact used for its sensitivity to the vanadium environment and turn out to be an efficient characterization technique to estimate the oxygen content within the Na3V 3+ 2-yV 4+ y(PO4)2F3-yOy family. The impact of the oxygen content on the transport properties was evaluated by electrochemical impedance spectroscopy. The material with y = 1.35 demonstrates the smallest electrical resistivity in the series, as well as the best rate capability and cyclability upon long-term cycling, despite no carbon coating and a high mass loading positive electrode.
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Dates et versions

hal-03573801 , version 1 (14-02-2022)

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Runhe Fang, Jacob Olchowka, Chloé Pablos, Rafael Bianchini Nuernberg, Laurence Croguennec, et al.. Impact of the F– for O2– substitution in Na3V2(PO4)2F3–yOy on their transport properties and electrochemical performance. ACS Applied Energy Materials, 2022, 5 (1), pp.1065-1075. ⟨10.1021/acsaem.1c03446⟩. ⟨hal-03573801⟩
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