Properties of Zr-Ti-V-Mn-Ni hydride alloy
(1. Institute of Nuclear Energy and Technology,
Tsinghua University, Beijing 102201, China;
2. Department of Materials and Metallurgy,
Northeastern University, Shenyang 110004, China;
3. Institute of Metal Research, The Chinese Academy of Sciences,
Shenyang 110016, China)
Tsinghua University, Beijing 102201, China;
2. Department of Materials and Metallurgy,
Northeastern University, Shenyang 110004, China;
3. Institute of Metal Research, The Chinese Academy of Sciences,
Shenyang 110016, China)
Abstract: Six kinds of Zr-based hydride alloy were designed. XRD analyses show that the main phase of Zr(1-x)Tix-(NiCoMnV)2.1 alloy is Laves C15 when x is between 0 and 0.5,but the more the content of Ti, the more the Laves C14 phases. The amount of Laves C14 can be up to the amount of Laves C15 after substituted V and Fe by V-Fe alloy in Zr0.6-Ti0.4(NiCoMnVFeCr)1.7 alloy. The electrochemical measurements show that the discharge capacity of Zr0.9Ti0.1-(NiCoMnV)2.1 electrode is about 340(mA·h/g) at 60mA/g, but with increasing the amount of Ti, the discharge capacity of alloy electrode abruptly decreases; at 300mA/g current density, its Kr can be up to 91%. The discharge capacity of Zr0.6-(Ti0.4)-(NiCoMn(V-Fe)Cr)1.62 alloy electrode is about 200(mA·h/g) at first cycle, the maximum capacity is more than that of the electrode with pure V, and about 315mA·h/g.
Key words: Zr-based hydride alloy; XRD; Laves phase; discharge capacity