Electrochemical Behavior and Discharge Performance of a Low-Alloyed Mg-Ag Alloy as Anode for Mg-Air Battery
Received date: 2023-08-10
Revised date: 2024-01-02
Online published: 2024-01-18
Supported by
National Natural Science Foundation of China(52375370);Natural Science Foundation of Shanxi Province(202103021224049);Shanxi Zhejiang University New Materials and Chemical Research Institute Scientific Research Project(2022SX-TD025);Open Project of Salt Lake Chemical Engineering Research Complex, Qinghai University(2023-DXSSKF-Z02)
Primary Mg-air batteries have attracted considerable attention in the field of standby emergency energy storage in the wilderness because of their high theoretical voltage (3.1 V) and appreciable specific energy (6.8 kWh/kg). However, because of the severe self-corrosion and sluggish anodic kinetics of Mg anodes, the actual performance of Mg-air batteries is far from the theoretical limits. To synergistically enhance the discharge voltage and specific energy of Mg-air batteries, a low-alloyed Mg-1Ag (mass fraction, %) anode was developed, and its microstructure, electrochemical behavior, and discharge properties were evaluated. The results showed that the extruded alloy mainly consisted of equiaxed grains with an average grain size of (14.19 ± 2.27) μm. The anode studied exhibited a typical extrusion texture with a basal pole perpendicular to the transverse direction, and the texture intensity was 11.05. Additionally, the extruded alloy was shown to exhibit localized segregation of Ag. The Mg-air battery based on the Mg-1Ag alloy as the anode exhibited a stable discharge process. In addition, the cell voltage and specific energy reached 1.344 V and 1374.34 mWh/g at 10 mA/cm2, respectively. The acceptable discharge performance of the anode was mainly due to the redeposition of metal Ag on the electrode surface, the multi-cracked discharge product film, and the non-basal-oriented grains with a high-volume fraction.
HAO Xubang , CHENG Weili , LI Jian , WANG Lifei , CUI Zeqin , YAN Guoqing , ZHAI Kai , YU Hui . Electrochemical Behavior and Discharge Performance of a Low-Alloyed Mg-Ag Alloy as Anode for Mg-Air Battery[J]. Acta Metall Sin, 2025 , 61(6) : 837 -847 . DOI: 10.11900/0412.1961.2023.00332
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