CARACCIOLO, Laure; MADEC, Lénaïc; PETIT, Emmanuel; GABAUDAN, Vincent; CARLIER, Dany; CROGUENNEC, Laurence; MARTINEZ, Hervé

doi:10.1149/1945-7111/abbb0c

Métadonnées

Licence d’utilisation du document

CARACCIOLO, Laure
Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM]

MADEC, Lénaïc
Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM]
Réseau sur le stockage électrochimique de l'énergie [RS2E]

PETIT, Emmanuel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]

Langue

Article de revue

Ce document a été publié dans

Journal of The Electrochemical Society. 2020-09-10, vol. 167, n° 13, p. 130527 (4 p.)

Electrochemical Society

Résumé en anglais

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.< Réduire

DOI

http://dx.doi.org/10.1149/1945-7111/abbb0c

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