J. Mater. Sci. Technol. ›› 2025, Vol. 213: 24-41.DOI: 10.1016/j.jmst.2024.06.029

• Research Article • Previous Articles     Next Articles

New strategy for Mg-air battery voltage-efficiency synergy by engineering protective film with cation vacancies on Mg anode surface

Yuying Hea, Qianyu Wanga, Jinghuai Zhanga,*, Lele Wanga, Shujuan Liub,*, Zehua Lia, Zhen Weia, Hao Donga, Xiaobo Zhangc   

  1. aKey Laboratory of Superlight Material and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;
    bSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
    cJiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing Institute of Technology, Nanjing 211167, China
  • Received:2024-05-15 Revised:2024-06-15 Accepted:2024-06-23 Published:2025-04-01 Online:2025-04-01
  • Contact: *E-mail address: zhangjinghuai@hrbeu.edu.cn (J. Zhang), liusj0817@hit.edu.cn (S. Liu)

Abstract: Although the Mg-air battery with high theoretical energy density is desirable for the energy supply of marine engineering equipment, its applications remain limited due to the low actual discharge voltage and inferior Mg anode utilization rate. In addition to the microstructure of Mg alloy anodes, the properties of discharge product films are of great importance to the discharge performance. Herein, the discharge behaviors of Mg-Y-Zn alloys are first studied mainly from the perspective of film properties. Through contrastive analysis, it is found that the sufficient Y3+ produced during the discharge process can substitute Mg2+ in Mg(OH)2 to introduce effective cation vacancies. The Mg-Y-Zn anode with profuse cation vacancies in the product film shows a synergy of potential and efficiency, and this can be attributed to an increase in the migration pathway for Mg2+, reducing the diffusion over-potential caused by the protective product film. This study is expected to provide a new strategy from the perspective of cation vacancy design of discharge film for developing high-performance Mg-air batteries.

Key words: Mg alloy, Mg-air battery, Product film, Cation vacancy, Discharge performance