Electrochemical Behavior and Discharge Performance of Extruded Dilute Mg-Bi-Based Alloy as an Anode for Primary Mg-Air Battery

Abstract

In this study, the electrochemical behavior and discharge property of dilute Mg-0.5Bi-0.5Ca -0.5Ag alloy as an anode for primary Mg-air battery are studied and compared with that of Mg-0.5Bi base alloy at the same condition. The results show that the addition of trace Ca and Ag to Mg-0.5Bi base alloy is conducive to enhancing the dynamic recrystallization (DRX) extent, and reducing the texture intensity and KAM value, and thus improving the homogeneity of the microstructure. Furthermore, the Mg-0.5Bi-0.5Ca-0.5Ag anode presents high level of synergy between cell voltage and anodic efficiency by means of enhanced anode dissolution kinetics and uniformity . In addition, re-deposited Ag in the discharge products can improve discharge activity through promoting the dissolution of the Mg matrix and rupture the discharge product film. For these reasons, we propose a novel approach for developing dilute Mg anode with high voltage-efficiency synergy based on microstructural homogeneity controlling.

Keywords: Mg-air batteries, Mg-Bi based anodes, Microstructural characteristics, Electrochemical behaviors, Discharge properties