Reactivity of TiH<subscript>2</subscript> hydride with lithium ion: Evidence for a new conversion mechanism
In: International Journal of Hydrogen Energy, Jg. 37 (2012-05-01), Heft 9, S. 7831-7835
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Zugriff:
Abstract: The electrochemical reactivity of the face centered cubic (fcc) TiH2 hydride with lithium ion was studied. A full discharge capacity of 1072 mAh/g at an average potential of 0.2 V can be achieved when the TiH2 hydride electrode is ground with 10wt% of carbon. From X-ray diffraction (XRD) characterization of the electrodes, dehydrogenation of the titanium hydride via an electrochemical process occurs following different reaction steps. From 0 to 0.34 Li, an fcc δ-TiH2−x solid solution is formed according to the reaction δ-TiH2 (fcc) + 0.34 Li → δ TiH1.66 (fcc) + 0.34 LiH. Pursuing the dehydrogenation process from 0.34 to 1, the cubic solid solution δ-TiH2−x reacts with lithium ion and transforms partially in a distorted face centered orthorhombic phase δ-TiH (fco). At this stage, the absence of hexagonal close-packed (hcp) α-Ti formation is attributed to the peritectic transformation: hcp α-Ti(H) + fcc δ-TiH2−x → δ-TiH. From 1 to 2 Li, a usual conversion mechanism is observed leading to the formation of hcp α-Ti and LiH according to the reaction δ-TiH2−x (fcc) ↔ δ-TiH (fco) + Li → α-Ti (hcp) + LiH. [Copyright &y& Elsevier]
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Reactivity of TiH<subscript>2</subscript> hydride with lithium ion: Evidence for a new conversion mechanism
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Autor/in / Beteiligte Person: | Oumellal, Y. ; Zaïdi, W. ; Bonnet, J. P. ; Cuevas, F. ; Latroche, M. ; Zhang, J. ; Bobet, J. L. ; Rougier, A. ; Aymard, L. |
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Zeitschrift: | International Journal of Hydrogen Energy, Jg. 37 (2012-05-01), Heft 9, S. 7831-7835 |
Veröffentlichung: | 2012 |
Medientyp: | academicJournal |
ISSN: | 0360-3199 (print) |
DOI: | 10.1016/j.ijhydene.2012.01.107 |
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