Performance of Mg-air Battery Based on AZ31 Mg Alloy Sheets with Different Grain Sizes

摘要

Mg-air batteries have attracted great attention recently because of their high energy density and lack ofpollution. This paper studied the effect of grain sizes on the performance of Mg-air batteries. AZ31 Mgalloy sheets with different grain sizes were obtained through cold-rolling and annealing. Thepotentiodynamic polarization curves revealed that AZ31 Mg alloy sheets with fine grain sizes havehigher electrochemical activity and better corrosion resistance compared to AZ31 Mg alloy sheets withcoarse grain sizes. Mg-air batteries based on processed AZ31 alloy sheets were prepared, and thebattery performances were investigated by a constant-current discharging test. The results show thatthe Mg-air battery based on a fine-grain anode exhibited a preferable discharge performance, includinga higher discharge voltage and a higher anodic efficiency that those of the battery is a coarse-grainanode.