Synthesis and electrochemical characterizations of the nanocrystalline Ti[Co xMg 1−x] ( x = 0.65) material as a hydrogen storage alloy

Abstract

The millennium application of new hydrogen absorbing alloys as negative electrodes in rechargeable batteries has allowed the consideration of nickel/metal hydride (Ni–MH) batteries to replace the conventional nickel cadmium alkaline or lead acid batteries. In this study the mechanical alloying process was used for synthesizing nanocrystalline TiCo–Mg-type hydrogen storage materials. The pressing negative and positive electrode, polyethylene as a separator and 6 mol/l KOH as an electrolyte solution constructed the cells. The nanocrystalline alloys electrode was subjected to charge/discharge cycle for more than 200 cycles. The discharge capacities of the nanocrystalline alloys withstand at 240 mAh/g with a nominal fading in capacity on prolonged cycling. The results show that when using sealed batteries nanocrystalline Ti[Co 0.65Mg 0.35] alloy electrode shows two times more capacity than TiNi counterparts.