Effect of Ga on microstructure and electrochemical performance of Al−0.4Mg−0.05Sn−0.03Hg alloy as anode for Al−air batteries
The effects of 0.01 wt.％ Ga on microstructure and electrochemical performance of Al−0.4Mg−0.05Sn− 0.03Hg anodes in NaOH solutions were investigated. Potentiodynamic polarization, electrochemical impedance spectroscopy, and galvanostatic discharge tests were used to assess the electrochemical performance of the Al−Mg−Sn−Hg−Ga anodes. The results show that the addition of 0.01 wt.％ Ga in Al−0.4Mg−0.05Sn−0.03Hg anode enhances its corrosion resistance and discharge activity. It is benefited from the refined second phases and homogenous microstructure of Al−Mg−Sn−Hg−Ga anode, which restrains the local crystallographic corrosion and chunk effect. Compared with Al−Mg−Sn−Hg anode, the corrosion current density and the mass loss rate of Al−Mg−Sn−Hg−Ga anode decrease by 57％ and 93％, respectively. When discharging at the current density of 20 mA/cm2, the discharge voltage, current efficiency and specific capacity of the single Al−air battery with Al−0.4Mg−0.05Sn−0.03Hg−0.01Ga anode are 1.46 V, 33.1％, and 1019.2 A·h·kg−1, respectively. The activation mechanism of Ga on Al−Mg−Sn−Hg−Ga anode materials was also discussed.
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