Preparation and Properties of Vanadium-based Hydrogen Storage Alloy Based on Mechanical Vibration

The mechanical vibration with various vibration frequencies and vibration time were introduced into the pouring process to prepare V₃TiNi_0.56 vanadium-based hydrogen storage alloy for automobile battery,and the corrosion resistance,charge-discharge cycle stability and microstructure of the obtained samples were compared with those of the samples without mechanical vibration.The results show that the mechanical vibration can obviously refine the grain,improve the internal structure and improve the corrosion resistance and charge-discharge cycle stability of the alloy.With the increase of vibration frequency from 20 Hz to 60 Hz and vibration time from 5 s to 35 s,the internal grains of the alloy are refined first and then coarsened,both of the corrosion resistance and charge-discharge cycle stability are improved first and then decreased.Compared with the samples without mechanical vibration,the corrosion potential of the alloy prepared by introducing mechanical vibration with vibration frequency of 40 Hz and vibration time for 20 s in the pouring process positively shifts by 93 mV and the decay rate of discharge capacity decreases by 22%.