QUESNE-TURIN, Ambroise; FLAHAUT, Delphine; VALLVERDU, Germain; CROGUENNEC, Laurence; ALLOUCHE, Joachim; WEILL, François; MÉNÉTRIER, Michel; BARAILLE, Isabelle

doi:10.1016/j.apsusc.2020.148514

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

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

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

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Article de revue

Ce document a été publié dans

Applied Surface Science. 2021, vol. 542, p. 148514

Elsevier

Résumé en anglais

This paper investigates the role of the stacking fault (5%, 20% and 50%) and the morphology of Li2MnO3 lamellar materials, issued from coprecipitation method with three annealing temperatures, on the surface reactivity. The structure and the morphology have been characterized by XRD, SEM and TEM. We studied the surface reactivity of these materials by combining X-ray photoemission spectroscopy (XPS), gaseous adsorption and first-principle calculations. An evolution of the reactivity toward the SO2 acid gaseous probe has been observed for the three materials, from pure redox mechanism toward mixed acid-base/redox mechanisms, respectively for 5% and 50% of stacking faults. We demonstrated that the electronic structure of Li2MnO3 being not modified by stacking faulted. Thus, the surface reactivity of faulted Li2MnO3 is not linked to the SF rate but only governed by the accessible crystalline surfaces and the manganese environments at the surface atomic layer. The formation of (0 0 1)-Li surface according to the Li-overstoichiometry on the extreme surface and the random particles shape of the more faulted materials are responsible of the reactivity tuning.< Réduire

Mots clés en anglais

Stacking fault

Surface reactivity

Li2MnO3

Chemisorption

Li-ion battery

DOI

http://dx.doi.org/10.1016/j.apsusc.2020.148514

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