High-temperature electrochemical performance
and phase composition of Ti0.7Zr0.5V0.2Mn1.8-xNix
hydrogen storage electrode
and phase composition of Ti0.7Zr0.5V0.2Mn1.8-xNix
hydrogen storage electrode
(Department of Materials Science and Engineering,
Zhejiang University, Hangzhou 310027, P.R.China)
Zhejiang University, Hangzhou 310027, P.R.China)
Abstract: The rapid development of electric vehicles demands the development of high performance nickel-metal hydride battery that is able to endure high temperature. The discharge properties of Ti0.7Zr0.5V0.2Mn1.8-xNix(x =0.4, 0.8,1.1,1.4,1.7)hydrogen storage alloys was investigated and its phase composition was analyzed using X-ray diffraction. The results show that the cycling life was improved as the content of nickel increases. When x =0.4,0.8,1.1 and 1.4, the main phase is MgZn2 type C14 Laves phase and the second one is cubic TiNi phase. When x=1.7, the Laves phase structure disappears. EDAS analysis shows that the increase of nickel content is effective in suppressing the dissolution of vanadium component in alloys.
Key words: hydrogen storage electrode alloys； high temperature electrochemical performance； phase composition