Preparation and Properties of Vanadium-based Hydrogen Storage Alloy for V-Ti-Ni-Al Battery Negative Electrode

The hydrogen absorption and desorption properties and electrochemical stability of vanadium-based hydrogen storage alloy for negative electrode of V₃TiNi_0.56Al_0.3 battery at different ball milling speeds and sintering temperatures were tested,compared and analyzed.The results show that with the increase of ball milling speed and sintering temperature,the maximum hydrogen uptake first increases and then decreases,while the discharge capacity decay rate first decreases and then increases,with the hydrogen uptake and desorption performance and electrochemical stability of the alloy increasing first and then decreasing.Compared with those of the alloy obtained at 300 rpm of ball milling speed,the maximum hydrogen absorption is increased by 26.53% and the discharge capacity attenuation is decreased by 50% for the alloy at 600 rpm of ball milling speed.The maximum hydrogen absorption is increased by 21.17% and the discharge capacity attenuation is decreased by 46.6% for the alloy obtained at 1 300 ℃ of sintering temperature,compared with the alloy at 1 000 ℃ of sintering temperature.The technological parameters of vanadium-based hydrogen storage alloy for negative electrode of V₃TiNi_0.56Al_0.3 battery are optimized at 600 r/min of ball milling speed and 1 300 ℃ of sintering temperature.