DAHÉRON, Laurence; DEDRYVÈRE, Rémi; MARTINEZ, Hervé; MÉNÉTRIER, Michel; DENAGE, Cathy; DELMAS, Claude; GONBEAU, Danielle

doi:10.1021/cm702546s

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DAHÉRON, Laurence
Laboratoire de Chimie théorique et Physico-chimie moléculaire [LCTPCM]

DEDRYVÈRE, Rémi
Laboratoire de Chimie théorique et Physico-chimie moléculaire [LCTPCM]

MARTINEZ, Hervé
Laboratoire de Chimie théorique et Physico-chimie moléculaire [LCTPCM]

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Chemistry of Materials. 2008, vol. 20, n° 2, p. 583-590

American Chemical Society

Résumé en anglais

Lithium deintercalation of LixCoO2 from x = 1 to x ≈ 0 has been carried out electrochemically. The changes in the electronic structure from LiCoO2 to CoO2 have been investigated by X-ray photoelectron spectroscopy (XPS) to bring some new developments about the electron transfer mechanisms upon lithium deintercalation. All available XPS core peaks (Co 2p, Co 3p, Co 3s, O 1s, F 1s, P 2p, C 1s) and valence spectra have been analyzed. The contributions of the electrode material and of the electrode/electrolyte interface have been clearly distinguished. We show that cobalt and oxygen simultaneously undergo a partial oxidation process and that the sole participation of oxygen atoms to the charge transfer process, as it is sometimes assumed, can be excluded. The surface film consists of organic and inorganic species resulting from degradation of the electrolyte.< Réduire

Mots clés en anglais

X-ray photoelectron spectroscopy

Electronic structure

Electron

Lithium deintercalation

Transfer mechanisms

Cobalt lithium oxide

Cobalt dioxide

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Electron transfer mechanisms upon lithium deintercalation from LiCoO2 to CoO2 investigated by XPS

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