Effect of Texture on the Performance of Mg-air Battery Based on Rolled Mg-3Al-1Zn Alloy Sheet

Abstract

Abstract Commercial rolled Mg-3Al-1Zn (AZ31) alloy sheet was used as the experimental material, an Mg-air battery based on its rolling surface (RS) and cross-section surface (CS) were both prepared to study the effect of texture on the performance of Mg-air battery. And the experimental samples had a similar surface roughness to practical application. The impedance spectroscopy (EIS) was used to investigate the electrochemical behavior of the samples. The results show that CS surface has a higher corrosion resistance compared with the RS surface. The battery performance was studied by constant current discharge test, and the results show that the Mg-air battery based on the CS surface anode has higher anode efficiency (71.3%) compared with the Mg-air battery based on the RS surface anode (65.7%). The surface morphologies of the magnesium alloy anodes substrate after discharged for 24 h were observed by scanning electron microscope. The RS anode exhibits a magnesium alloy anode substrate with more holes and gullies, which may contribute to its lower anode efficiency. Thus, the CS anode dominated by (10 1 ¯ 0), (11 2 ¯ 0) and (10 1 ¯ 1) orientated grains is more suitable to use on Mg-air battery.