Effect of Al Addition on Electrochemical Activity of Mg-Al-Zn Alloys

Abstract

In the context of the need to improve the performance of rechargeable batteries, attention was paid to magnesium, which is promising in terms of energy density, safety, and procurement costs, and anode materials were prepared. Anode ribbons were produced using the single-roll rapid solidification method. This method is less expensive to produce than rolling and has a weaker orientation to the basal (0001) plane, resulting in better electrochemical activity. In this study, constant current charge-discharge tests were carried out on AZ31, AZ61, and AZ91 to investigate the influence of aluminum content on their electrochemical properties. The results showed that in the discharge reaction, the overvoltage increased with increasing aluminum content, while in the charge reaction, the voltage slope tended to increase significantly. In other words, the electrochemical properties were degraded. It is suggested that the cause is the change in lattice constant and increased basal orientation with increasing aluminum content.