Lithium storage in amorphous TiNi hydride: Electrode for rechargeable lithium-ion batteries
2013 (English)In: Materials Chemistry and Physics, ISSN 0254-0584, Vol. 141, no 1, 348-354 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2013. Vol. 141, no 1, 348-354 p.
Amorphous materials, Powder metallurgy, Electron microscopy, Powder diffraction, Ab initio calculations, Electrochemical properties
Other Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-126870DOI: 10.1016/j.matchemphys.2013.05.021ISI: 000322149700050ScopusID: 2-s2.0-84879970539OAI: oai:DiVA.org:kth-126870DiVA: diva2:642743
FunderSwedish Research CouncilFormas
QC 201308232013-08-232013-08-222013-08-23Bibliographically approved