FANG, Runhe; OLCHOWKA, Jacob; PABLOS, Chloé; NUERNBERG, Rafael; CROGUENNEC, Laurence; CASSAIGNON, Sophie

doi:10.1021/acsaem.1c03446

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FANG, Runhe
Laboratoire de Chimie de la Matière Condensée de Paris [LCMCP]
Réseau sur le stockage électrochimique de l'énergie [RS2E]

OLCHOWKA, Jacob
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Advanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]
Réseau sur le stockage électrochimique de l'énergie [RS2E]

PABLOS, Chloé
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]
Réseau sur le stockage électrochimique de l'énergie [RS2E]

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Article de revue

Ce document a été publié dans

ACS Applied Energy Materials. 2022-01-24, vol. 5, n° 1, p. 1065-1075

ACS

Résumé en anglais

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.< Réduire

Mots clés en anglais

Na-ion batteries

Polyanionic positive electrode materials

Na3V2(PO4)2F3

Na3(VO)2(PO4)2F

Transport properties

Raman spectroscopy

DOI

http://dx.doi.org/10.1021/acsaem.1c03446

Project ANR

Laboratory of excellency for electrochemical energy storage - ANR-10-LABX-0076

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026