Electrochemical behavior and discharge performance of dilute Mg-Bi-based alloy as an anode for primary Mg-air battery

• Published in: Materials characterization Vol. 209; p. 113688
• Main Authors: Cheng, Weili, Hao, Xubang, Shangguan, Feier, Chen, Yuhang, Yu, Hui, Wang, Lifei, Cui, Zeqin, Li, Hang, Zhang, Xiaochao, Wang, Jinhui, Li, Jian
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.03.2024
• Subjects: Discharge properties; Electrochemical behaviors; Mg-air batteries; Microstructural characteristics; Mg-air batteries; Microstructural characteristics; Discharge properties; Electrochemical behaviors
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2024.113688

In this study, the electrochemical behavior and discharge performance of dilute Mg-0.5Bi-0.5Ca-0.5Ag alloy as an anode for primary Mg-air battery are studied and compared with those of Mg-0.5Bi base alloy. 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, reducing the basal texture component and kernel average misorientation value. In addition, re-deposited Ag in the discharge products can improve discharge activity by promoting the dissolution of the Mg matrix and rupturing the discharge product film. For these reasons, the Mg-0.5Bi-0.5Ca-0.5Ag anode presents a high level of synergy between cell voltage and anodic efficiency by means of the enhanced anode dissolution kinetics and effective reactive area. Therefore, dilute MgBi based anode micro-alloyed with Ag and Ca presents a great potential to be developed as novel anode material for Mg-air battery. •The Ca/Ag micro-alloying improves the homogeneity of microstructure.•The addition of Ca and Ag boosts discharge properties via enhanced reaction kinetics.•Ag addition induces the re-deposited Ag on the anode surface.