Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 468, Issue 1-2, Pages 482-492Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2008.01.033
Keywords
Hydrogen absorbing materials; Transition metal alloys and compounds; Metal hydride; Electrochemical reactions
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Vanadium, as the most important B-site modifier in (Zr,Ti)Ni-2-based phase alloy, was studied to optimize the performance of nickle metal hydride batteries. As the amount of V-substitution for Ni increases, the total hydrogen storage capacity increases, while the reversible hydrogen storage capacity decreases due to the formation of a stable hydride. Lattice constants increase with higher vanadium contents indicating the majority of vanadium atoms reside in the B-site. Broader X-ray diffraction peaks and higher pressure-concentration isotherm slope factors indicate a higher degree of disorder for alloys with a higher V-content. In the study of a series of alloys with various V, Ni, Ti, Zr contents (while maintaining a constant value of electronegativiry), all alloys exhibit similar pressure-concentration isotherms and half-cell characteristics. The sealed NiMH battery performance indicates that in the pure C14 alloy family, low-vanadium alloys (12-13 at.%) are more favorable in regards to peak power stability, charge retention, and cycle life. (C) 2008 Elsevier B.V. All rights reserved.
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