Effects of external field treatment on the electrochemical behaviors and discharge performance of AZ80 anodes for Mg-air batteries
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第3期
论文作者：Xingrui Chen Shaochen Ning Qichi Le Henan Wang Xingrui Chen Ruizhen Guo Jian Hou Yonghui Jia Andrej Atrens Fuxiao Yu
文章页码：47 - 55
摘 要：In this work, the effects of external field treatment on electrochemical behaviors and discharge performance of as-cast Mg-8%Al-0.5%Zn（wt%） anodes for Mg-air batteries are systematically investigated in3.5 wt% Na Cl solution. The external field treatment particularly the variable-frequency ultrasonic field can dramatically refine the α-Mg grains and μ phases. The grain size decreases from 1594.8 ± 43 μm（untreated billet） to 140.6 ± 15 μm after variable-frequency ultrasonic field treatment. The values of open circuit potential, electrochemical activity and corrosion resistance of Mg-8%Al-0.5%Zn anode are improved with external field treatment, which should be attributed to refined grains and dispersive αphase. The external field treatment especially the variable-frequency ultrasonic field improves stability and the value of cell voltage, and enhances the discharge performance of the Mg-8%Al-0.5%Zn anode. The variable-frequency ultrasonic field treated anode has the best discharge capacity and anodic efficiency at current density of 45 m A cm-2, with the values of 1417 m A h g-1 and 63.3%, respectively. The ultrasonic field vibration changes the dissolution behavior of α-Mg matrix during the discharge process, showing the oriented surface morphologies.
Xingrui Chen1，Shaochen Ning1，Qichi Le1，Henan Wang1，Qi Zou1，Ruizhen Guo1，Jian Hou1，Yonghui Jia1，Andrej Atrens2，Fuxiao Yu1
1. Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University2. School of Mechanical and Mining Engineering, The University of Queensland
摘 要：In this work, the effects of external field treatment on electrochemical behaviors and discharge performance of as-cast Mg-8%Al-0.5%Zn（wt%） anodes for Mg-air batteries are systematically investigated in3.5 wt% Na Cl solution. The external field treatment particularly the variable-frequency ultrasonic field can dramatically refine the α-Mg grains and μ phases. The grain size decreases from 1594.8 ± 43 μm（untreated billet） to 140.6 ± 15 μm after variable-frequency ultrasonic field treatment. The values of open circuit potential, electrochemical activity and corrosion resistance of Mg-8%Al-0.5%Zn anode are improved with external field treatment, which should be attributed to refined grains and dispersive αphase. The external field treatment especially the variable-frequency ultrasonic field improves stability and the value of cell voltage, and enhances the discharge performance of the Mg-8%Al-0.5%Zn anode. The variable-frequency ultrasonic field treated anode has the best discharge capacity and anodic efficiency at current density of 45 m A cm-2, with the values of 1417 m A h g-1 and 63.3%, respectively. The ultrasonic field vibration changes the dissolution behavior of α-Mg matrix during the discharge process, showing the oriented surface morphologies.
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