DAHÉRON, Laurence; DEDRYVÈRE, Rémi; MARTINEZ, Hervé; FLAHAUT, Delphine; MÉNÉTRIER, Michel; DELMAS, Claude; GONBEAU, Danielle

doi:10.1021/cm901972e

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

DAHÉRON, Laurence
Institut pluridisciplinaire de recherche sur l'environnement et les matériaux [IPREM]

DEDRYVÈRE, Rémi
Institut pluridisciplinaire de recherche sur l'environnement et les matériaux [IPREM]

MARTINEZ, Hervé
Institut pluridisciplinaire de recherche sur l'environnement et les matériaux [IPREM]

Langue

Article de revue

Ce document a été publié dans

Chemistry of Materials. 2009, vol. 21, n° 23, p. 5607-5616

American Chemical Society

Résumé en anglais

Aluminum-based coatings are commonly used in lithium-ion batteries to modify the surface of LiCoO2 particles, to limit cobalt dissolution in the electrolyte at high voltage. It was shown that the formation of a LiCo1−xAlxO2 solid solution occurs at the interface between the coating and the core material. In this paper, we investigated the surface properties of LiCo1−xAlxO2 materials by X-ray photoelectron spectroscopy. We explored the surface acid−base properties of these materials by adsorption of gaseous probe molecules (NH3 and SO2) followed by XPS analyses. We showed that the basic character of the LiCo1−xAlxO2 surface strongly decreases when x increases, which makes these materials less reactive than LiCoO2 toward acidic species (such as HF) that are present in LiPF6-based electrolytes. This is a possible explanation for the efficiency of Al-based coatings to protect LiCoO2 against cobalt dissolution in the electrolyte.< Réduire

Métadonnées

Licence d’utilisation du document

Possible explanation for the efficiency of Al-based coatings on LiCoO<sub>2</sub>: surface properties of LiCo<sub>1−<i>x</i></sub>Al<sub><i>x</i></sub>O<sub>2</sub> solid solution

Langue

Ce document a été publié dans

Résumé en anglais

DOI

Origine

Unités de recherche