Roles of Ni, Cr, Mn, Sn, Co, and Al in C14 Laves phase alloys for NiMH battery application

Nickel-metal hydricle battery (NiMH) performance has been compiled and analyzed against modifier compositions of metal hydride alloys used in the negative electrode. Thirty-three alloys with the general chemical formula Ti12Zr21.5V10Ni56.5-a-b-c-d-eCraMnbSncCodAle (1.0 <= a <= 14.5, 1.1 <= b <= 15.6, 03 <= c <= 0.8, 0.0 <= d <= 8.0, and 0.0 <= e <= 3.1)were made into ingots, powders, electrodes, and batteries to study the influence of Ni, Cr, Mn, Sri, Co, and Al on NiMH battery performance. C14-predominancy and multi-component nature were confirmed by X-ray diffraction and scanning electron microscope, respectively. Gas phase storage, half-cell, and full-cell characteristics of these alloys were measured, and the influence from each modifier element was analyzed. Correlations between measured properties were also studied and reported. (c) 2008 Elsevier B.V. All rights reserved.