Effects of Alloy Elements （Sn， Sb， Si， Mn） on the Electrochemical Performance of Al-Ga-In-M Anode for the Seawater Oxygen-Dissolved Battery

The Al-Ga-In-M quaternary aluminum alloy anode was obtained by modifying the Al-Ga-In aluminum alloy with alloy elements of Sn， Sb， Si and Mn. The properties of Al-Ga-In-M quaternary aluminum alloy were studied by X-ray diffraction （XRD）， scanning electron microscope （SEM）， electrochemical experiments， and battery discharge tests. The results show that Sn and Sb can improve the electrochemical activity of Al-Ga-In aluminum alloy. Furthermore， Sn displays the most significant increase for the aluminum anode based on the “dissolution and redeposition” mechanism， but serious local corrosion occurs， resulting in a high self-corrosion rate. On the other hand， Si and Mn reduce the electrochemical activity of Al-Ga-In aluminum alloy and show good self-corrosion resistance. When combining the anode with 20% Pt-C composite cathode， Al-Ga-In-Sn alloy has the highest discharge voltage （1.5 V at 0.5 mA/cm2 constant current density）， Al-Ga-In-Si alloy anode exhibits excellent discharge capacity （2941 A·h/kg）， and Al-Ga-In-Sb alloy anodes have the highest energy density （1447.4 Wh/kg）.