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H<inf>2</inf> thermal desorption and hydride conversion reactions in Li cells of TiH<inf>2</inf>/C amorphous nanocomposites

TitleH2 thermal desorption and hydride conversion reactions in Li cells of TiH2/C amorphous nanocomposites
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2015
AuthorsVitucci, F.M., Paolone A., Brutti S., Munaò D., Silvestri L., Panero S., and Reale P.
JournalJournal of Alloys and Compounds
KeywordsConversion reactions, Crystal structure, Dehydrogenation, Electric discharges, Electrochemical process, Electron microscopy, Enthalpy, Galvanostatic cycling, Hydrides, Hydrogen, Hydrogen absorbing material, Lithium, Mass Spectrometry, Mechano-chemical processing, Mechano-chemical routes, Mechanochemical treatment, Nanocomposites, Thermal dehydrogenation, Thermodynamic properties, Thermogravimetric analysis, Transmission electron microscopy, X ray diffraction

Abstract Here we investigate the properties of amorphous TiH2/carbon nanocomposites as possible active material in lithium cells. Several TiH2/C mixtures are prepared by a mechanochemical route, by varying the carbon/hydride ratio. Materials are tested in electrochemical cells versus lithium metal in EC:DMC LiPF6 electrolyte by galvanostatic cycling (GC) and are characterized by X-ray diffraction, transmission electron microscopy, thermogravimetry and mass spectrometry. Thermal dehydrogenation processes are altered by the mechanochemical treatment of the sample: milling decreases the hydrogen content of the hydride. On the other hand, the mechanochemical grinding increases the specific capacity delivered during the first GC discharge. We suggest that the electrochemical process is the result of a delicate balance between the absolute quantity of hydrogen and its availability for the hydride conversion reaction. © 2015 Elsevier B.V.


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Citation KeyVitucci2015S46