Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1623724 | Journal of Alloys and Compounds | 2009 | 11 Pages |
Abstract
Vanadium, as the most important B-site modifier in (Zr,Ti)Ni2-based Laves phase alloy, was studied to optimize the performance of nickel 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 electronegativity), 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 (12-13Â at.%) are more favorable in regards to peak power stability, charge retention, and cycle life.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
K. Young, M.A. Fetcenko, F. Li, T. Ouchi, J. Koch,