Electrochemical mechanisms during lithium insertion intoTiO0.6S2.8 thin films positive electrode in lithium microbatteries - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of The Electrochemical Society Année : 2005

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

Résumé

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.
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Dates et versions

hal-00021162 , version 1 (17-03-2006)

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Marie-Hélène Lindic, Brigitte Pecquenard, Philippe Vinatier, Alain Levasseur, Hervé Martinez, et al.. Electrochemical mechanisms during lithium insertion intoTiO0.6S2.8 thin films positive electrode in lithium microbatteries. Journal of The Electrochemical Society, 2005, 152 (1), pp.A141-A146. ⟨10.1149/1.1834893⟩. ⟨hal-00021162⟩
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