Effect of La–Mg-based alloy addition on structure and electrochemical characteristics of Ti0.10 Zr0.15V0.35Cr0.10Ni0.30 hydrogen storage alloy

Effect of La–Mg-based alloy (AB5) addition on Structure and electrochemical characteristics of Ti0.10Zr0.15V0.35Cr0.10Ni0.30 hydrogen storage alloy has been investigated systematically. XRD shows that the matrix phase structure is not changed after adding AB5 alloy, however, the amount of the secondary phase increases with increasing AB5 alloy content. The electrochemical measurements show that the plateau pressure Ti0.10Zr0.15V0.35Cr0.10Ni0.30 + x% La0.85Mg0.25Ni4.5Co0.35Al0.15 (x = 0, 1, 5, 10, 20) hydrogen storage alloys increase with increasing x, and the width of the pressure plateau first increases when x increases from 0 to 5 and then decreases as x increases further, and the maximum discharge capacity changes in the same trend. The activation performance, the low temperature dischargeabilities, high-rate dischargeability and cyclic stability of composite alloy electrodes increase greatly with increasing x. The improvement of the electrochemical characteristics caused by adding AB5 alloy seems to be related to formation of the secondary phase.