Effect of Alloy Elements on the Microstructure and Electrochemical Performance of Vanadium-based Solid Solution Hydrogen Storage Alloy

The V₃TiNi_0.56 series vanadium-based solid solution hydrogen storage alloys were prepared with different contents of alloying elements of Sc or Y,and the microstructure,electrochemical corrosion resistance and charge-discharge cycling stability of the alloys were tested and analyzed. The results show that adding alloying elements of Sc or Y could improve the electrochemical corrosion resistance and charge-discharge cycling stability of the alloy. And the effect is better with the composite additives of Sc and Y than a single adding of Sc or Y. Compared with the V₃TiNi_0.56 alloy,the corrosion potential of the alloy with composite additives of Sc and Y is positively shifted by 193 mV,and attenuation rate of discharge capacity is decreased from 95% to 21% after 20 times of charge-discharge cycling.