LINDIC, Marie-Hélène; PECQUENARD, Brigitte; VINATIER, Philippe; LEVASSEUR, Alain; MARTINEZ, Hervé; GONBEAU, Danielle; PETIT, Pierre-Emmanuel; OUVRARD, Guy

doi:10.1149/1.1834893

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LINDIC, Marie-Hélène
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

PECQUENARD, Brigitte
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

VINATIER, Philippe
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of The Electrochemical Society. 2005, vol. 152, n° 1, p. A141-A146

Electrochemical Society

Résumé en anglais

Amorphous thin films were prepared by radio frequency magnetron sputtering from TiS2 target under pure argon atmosphere. Two complementary techniques, X-ray photoelectron spectroscopy and X-ray absorption spectroscopy, were used to investigate the local and electronic structure of the as-prepared sample and to study the electrochemical mechanisms occurring during the first cycle. The results exhibit that the as-prepared TiO0.6S2.8 thin film is close to bulk TiS3 [which may be viewed as Ti41(S2 2 2)S22] with regard to the local and electronic structure. An electrochemical characterization of the film was performed. Upon lithium insertion, sulfur is first involved in the electrochemical reduction, followed by titanium. The reduction of S2 2 2 to S22 is concomitant with the elongation of the distance between the two sulfur ions of the disulfide pair. At the end of the charge, the electrochemical processes appear to be reversible. This study clearly evidences the major contribution of sulfur atoms beside titanium.< Réduire

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Electrochemistry

Lithium batteries

Microbatteries

Intercalation compounds

Electrodes

Thin films

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Electrochemical mechanisms during lithium insertion intoTiO0.6S2.8 thin films positive electrode in lithium microbatteries

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