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

doi:10.1021/acsami.7b15249

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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]

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]

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]

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Article de revue

Ce document a été publié dans

ACS Applied Materials & Interfaces. 2017-12-13, vol. 9, n° 51, p. 44922-44930

Washington, D.C. : American Chemical Society

Résumé en anglais

This article focuses on the surface reactivity of two spinel samples with different stoichiometries and crystal morphologies, namely Li1+xMn2–xO4 with x = 0.05 and 0.10. LiMn2O4 compounds are good candidates as positive electrode of high-power lithium-ion batteries for portable devices. The samples were investigated using both experimental and theoretical approaches. On the experimental point of view, they were characterized in depth from X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy (XPS) analyses. Then, the reactivity was investigated through the adsorption of (SO2) gaseous probes, in controlled conditions, followed by XPS characterization. First-principle calculations were conducted simultaneously to investigate the electronic properties and the reactivity of relevant surfaces of an ideal LiMn2O4 material. The results allow us to conclude that the reactivity of the samples is dominated by an acido-basic reactivity and the formation of sulfite species. Nonetheless, on the x = 0.05 sample, both sulfite and sulfate species are obtained, the later, in lesser extent, corresponding to a redox reactivity. Combining experimental and theoretical results, this redox reactivity could be associated with the presence of a larger quantity of Mn4+ cations on the last surface layers of the material linked to a specific surface orientation.< Réduire

Mots clés en anglais

stoichiometry

XPS

surface reactivity

spinel positive electrode materials

stoichiometry

Surface reactivity

first-principle calculations

DOI

http://dx.doi.org/10.1021/acsami.7b15249

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