The influence of relative content of Ti and Zr on the electrochemical behavior of Laves phase alloy

The one of the main factors influencing the commercial application of Ti-based alloy in Ni-MH battery fields is the low cycle life. In this paper, the research focus was put upon the optimum of the A-side composition and the effect on the electrode cycle life. For this purpose, the comparison of non-stoichiometric and stoichiometric alloys was carried out in term of electrochemical properties, segregation of alloy components, through changing the A-side composition for AB2AB2 hydrogen storage alloy. Ratio of Ti vs. Zr influences the segregation behavior of the components. Higher Ti-content could promote the segregation process. For high Ti-content alloy, after cycles the surface is covered entirely by the oxides of Ti and Zr, especially Ti.