Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Electrochemical redox processes involved in carbon-coated KVPO4F for high voltage K-ion batteries revealed by XPS analysis

Abstract : K-ion batteries need efficient positive electrode materials with open structural frameworks to accommodate the large ionic radius of K +. In that direction, polyanionic compounds are of great interest. Among them, KVPO4F is the most studied one. Its electrochemical redox processes still remain unclear, especially at high voltage. To tackle this issue, X-ray photoelectron spectroscopy was used to reveal the electrochemical redox processes of KxVPO4F. First, a carbon coating was performed and allowed increasing the overall electrochemical performance while mitigating electrolyte degradation at high voltage. Then, XPS analysis showed a high reversibility of the redox processes although the K + extraction (and insertion) from x=0.5 to 0 2 was hindered, possibly by structural constraints while electrolyte degradation occurred mostly above 4.5 V.
Type de document :
Article dans une revue
Domaine :
Liste complète des métadonnées

Littérature citée [32 références]  Voir  Masquer  Télécharger

https://hal.umontpellier.fr/hal-02982857
Contributeur : Icg Aigle <>
Soumis le : vendredi 6 novembre 2020 - 22:33:10
Dernière modification le : mercredi 9 juin 2021 - 10:12:02
Archivage à long terme le : : lundi 8 février 2021 - 03:31:15

Fichier

KVPF redox - JES - Mainok - re...
Fichiers produits par l'(les) auteur(s)

Identifiants

Citation

Laure Caracciolo, Lénaïc Madec, Emmanuel Petit, Vincent Gabaudan, Dany Carlier, et al.. Electrochemical redox processes involved in carbon-coated KVPO4F for high voltage K-ion batteries revealed by XPS analysis. Journal of The Electrochemical Society, Electrochemical Society, 2020, 167 (13), 130527 (4 p.). ⟨10.1149/1945-7111/abbb0c⟩. ⟨hal-02982857⟩

Partager

Métriques

Consultations de la notice

149

Téléchargements de fichiers

217