Properties Optimization of Alloy for a New Vanadium Based Hydrogen Storage Battery

In this paper,the effect of Al addition on the microstructure,hydrogen absorption and desorption property,charge and discharge performance of a new vanadium-based hydrogen storage alloy was investigated.The results show that with increase in the addition amount of Al,the grains of the new alloy are refined first and then enlarged,and the maximum hydrogen absorption first increases and then decreases with the charge-discharge performance reduced first and then enhanced.Simultaneously,the microstructure of the alloy is gradually improved coupled with the hydrogen absorption-desorption property increasing first and decreasing afterwards,with increasing the Al addition.Compared with those of the alloy containing 0.1% Al,the average grain size and discharge capacity decay rate for the alloy containing 0.3% Al respectively decrease by 15 μm and 25% with the maximum hydrogen absorption increasing by 91.67%.The optimum Al content for the new vanadium-based hydrogen storage alloy is determined at 0.3%.