Aluminum-air (Al-air) batteries are promising candidates for energy storage applications because of their high theoretical energy density and low cost.Nevertheless,their developments have been severely hindered by multiple obstacles,among which the activation and self-corrosion inhibition of A1 anode have been considered to be significant challenges.In neutral electrolytes,the main problem is the activation of A1 anode,while the self-corrosion of A1 anode becomes dominant in alkaline electrolytes.Considerable efforts have been devoted to overcoming the dilenuna associated with the A1 anode.This review firstly underscores the underlying mechanisms of passivation and self-corrosion of Al anode in different electrolytes.Then,specific attentions are paid to A1 alloy anode,including the role of various elements and standard processing technology.Finally,general conclusions,current limitations,and future perspectives on Al alloy anode are presented.