Effect of alloy composition on electrochemical properties of the Zr-based Laves-phase hydrogen storage alloys

✍ Scribed by Chiaki Iwakura; Hideo Kasuga; Ingon Kim; Hiroshi Inoue; Masao Matsuoka

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 389 KB
• Volume: 41
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(96)00123-5

✦ Synopsis

Correlation between alloy composition of Laves-phase ZrV,_,_,Mn,Ni, (x = 0.2-0.8, y = 1.0, 1.2, 1.4) alloys and their negative electrode performance such as discharge capacity and high-rate dischargeability was investigated. At any y value unit cell volume decreased with increasing ratio of atomic radius of A(Zr) sites to average one of B(V-Mn-Ni) sites (rdre). while enthalphy change of hydride formation (-AH") decreased. Both the discharge capacity and the high-rate dischargeability for the alloys with the same y value were improved with decreasing -AH" value due to destabilization of absorbed hydrogen. The discharge capacity saturated gradually, probably due to a complete use of the absorbed hydrogen.