Abstract

As the anode material of Al air battery, 2N-purity (99 wt%) Al-based alloy has the disadvantages of low efficiency and low discharge voltage, which is attributed to the impurity of Fe in the 2N Al alloy. In this paper, the 2N Al-based anode with high energy efficiency and discharge voltage is successfully designed by adding Mn, Zn and Ga. The results show that adding Mn separately can inhibit hydrogen evolution corrosion but lead to the exfoliation corrosion of 2N Al. The addition of Ga, Mn and Zn together can suppress hydrogen evolution, decrease the weight loss of 2N Al alloy and significantly increase the output voltage and energy efficiency of an Al-air battery, which makes it possible to use cheap 2N Al as the anode of an Al-air battery.

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