Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 141, Issue 1, Pages 348-354Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2013.05.021
Keywords
Amorphous materials; Powder metallurgy; Electron microscopy; Powder diffraction; Ab initio calculations; Electrochemical properties
Categories
Funding
- Swedish Research Council (VR)
- FORMAS
- SWECO
- Wenner-Gren Foundations
- Chinese Scholarship Council
- STINT
- Council of Scientific and Industrial Research (CSIR), Delhi
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In this study, amorphous TiNi phase was successfully prepared using mechanically milling for a very short time of 8 h. HRTEM confirms the formation of amorphous phase with the presence of nanocrystalline Fe particles. After hydrogenation (30 bars of H-2 for a duration of 2 h), the electrochemical reaction shows that TiNi hydride/Li cell discharges at a current of one Li for 10 h between 3 V and 0.005 V. The discharge of TiNiH electrode around x = 1 Li corresponds to a capacity of 251 mAh g(-1) and a hydride composition of TiNiH1.0 at an average voltage of 0.4 V. Ex-situ X-ray diffraction pattern collected at the end of the discharge shows a mixture of amorphous TiNi compound and LiH. A general mechanism for the electrochemical reaction is then proposed: alpha-TiNiH + Li+ + e(-) -> alpha-TiNi + LiH. The results from DFT calculations yield an average cell voltage of 0.396 V, which is in good agreement with the experimental pseudo-plateau occurring at 0.4 V. (c) 2013 Elsevier B.V. All rights reserved.
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