Optimization of Mechanical Milling Parameters of Negative Alloy for V-Ti Battery

V-20.5 Ti-14 Ni-6 Co-4 Al battery alloy samples for negative electrode were prepared at different mechanical ball milling process parameters,and the charge-discharge cycle stability as well as the corrosion resistance of the obtained samples were tested and compared.The results show that the ball milling speed and time have a significant effect on the charge-discharge cycle stability and corrosion resistance of the alloys.With the increase of milling speed from 300 r/min to 700 r/min and the milling time from 2 h to 10 h,both of the charge-discharge cycle stability and corrosion resistance of the alloy increase first and then decrease.The ball milling speed and time of the alloy are optimized at 600 r/min and 6 h respectively.Compared with those of the alloy at the ball milling speed of 300 r/min,the decay rate of discharge capacity of the alloy at 600 r/min of ball milling speed decreases by 16% with the corrosion potential shifting positively by 81 mV.Compared with those of the alloy at the milling time of 2 h,the decay rate of discharge capacity of the alloy at the ball milling time of 6 h decreases by 18%,with the corrosion potential shifting positively by 116 mV.