A study of the electrochemical mechanisms involved during lithium insertion into TiO0.6S2.8 thin film used as positive electrode in lithium microbatteries
| Autor: | Lindic, M.H., Pecquenard, B., Vinatier, P., Levasseur, A., Martinez, Hervé, Gonbeau, Danielle, Petit, P.E., Ouvrard, G. |
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| Přispěvatelé: | Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Pau et des Pays de l'Adour (UPPA), Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Zaghib K. and Julien C.M. and Prakash J. |
| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
Electrochemical electrodes
Amorphous materials Electronic structure Absorption spectroscopy Lithium batteries thin films X ray photoelectron spectroscopy X ray absorption spectroscopy [CHIM]Chemical Sciences Disulfides [CHIM.MATE]Chemical Sciences/Material chemistry Magnetron sputtering Lithium insertion |
| Zdroj: | Proceedings-Electrochemical Society Proceedings-Electrochemical Society, 2003, Unknown, Unknown Region. pp.649--661 |
| Popis: | International audience; Amorphous thin films were prepared by radio-frequency magnetron sputtering from TiS2 target under pure argon atmosphere. Two complementary techniques, X-ray Photoelectron Spectroscopy (XPS) and X-ray Absorption Spectroscopy (XAS), were used to investigate the local and electronic structure of the asprepared sample and to study the electrochemical mechanisms occurring during the first cycle. The results exhibit that the as-prepared TiO 0.6S2.8 thin film is close to bulk TiS3 (which may be viewed as Ti4+S22-S2-) with regard to the local and electronic structure. The electrochemical characterization of the film was performed in the Li/LiAsF6 (IM in EMC)/TiO0.6S2.8 cell. Upon lithium insertion, sulfur is first involved into the electrochemical reduction followed by titanium. The reduction of S22- to S2- 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. |
| Databáze: | OpenAIRE |
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