MARTIN, Lucile; MARTINEZ, Hervé; POINOT, Delphine; PECQUENARD, Brigitte; LE CRAS, F.

doi:10.1016/j.jpowsour.2013.10.015

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MARTIN, Lucile
Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM]
Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux [LITEN]

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

POINOT, Delphine
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux [LITEN]

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Ce document a été publié dans

Journal of Power Sources. 2014, vol. 248, p. 861-873

Elsevier

Résumé en anglais

Morphology and composition changes occurring at the surface of CuO thin film electrode, used as conversion material for lithium-ion battery, were investigated at different stages of the electrochemical cycling by atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). Analyses were performed on samples obtained in LiPF6 containing carbonate-based electrolyte and prepared by linear sweep voltammetry. The formation/partial dissolution of a solid electrolyte interphase (SEI) was evidenced by XPS analyses. The SEI layer formed on lithiated CuO thin film during the first reduction between [3.5-0.8] V/Li+/Li is characterized by a LiF-rich inner layer and a Li2CO3-rich outer layer. Furthermore, reduction/oxidation cycles induced important surface morphology modifications. In particular, the growth and then the vanishing of large spherical nodules (∼400 nm in diameter) were observed during the lithium insertion and the subsequent deinsertion. During the twenty first cycles performed, even if a stable electrochemical behavior was shown, breathing of the thin film was also clearly evidenced by AFM images with the appearance and disappearance of numerous cracks as a function of Li removal and Li insertion processes. © 2013 Elsevier B.V. All rights reserved.< Réduire

Mots clés en anglais

Lithium batteries

Copper oxide

Thin film

SEI

XPS

AFM

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Direct observation of important morphology and composition changes at the surface of the CuO conversion material in lithium batteries

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