A study of the development of a high capacity and high performance Zr-Ti-Mn-V-Ni hydrogen storage alloy for Ni-MH rechargeable batteries

Abstract

Extensive investigations have been carried out for developing a Zr-based Laves phase alloy with high capacity and high rate-capability for electrochemical application. In order to increase the discharge capacity of the ZrMn0.7V0.5Ni1.2 alloy, which is optimized in our previous work [11], Ti was partially substituted for Zr and the stoichiometry was also changed. This change also increases the rate-capability. After such careful alloy design reached by substitution and changing stoichiometry, Zr0.9Ti0.1(Mn0.7V0.5Ni1.4)(0.92) alloys with high capacity and high rate-capability have been developed. This alloy has a discharge capacity of 392 mA h g(-1) at 0.25 C discharge rate and shows high rate-capability equalling that of commercialized AB, type alloys. (C) 1998 Elsevier Science S.A. All rights reserved.