| Summary: | Solid Al−air batteries are a promising power source for potable electronics due to their environmentally friendly qualities and high energy density. However, the solid Al−air battery suffers from anodic corrosion and it is difficult to achieve a higher specific capacity. Thus, this work aims at suppressing the corrosion of Al anode by adding an electrospun Al<sub>2</sub>O<sub>3</sub> interlayer on to the surface of the anode. The Al<sub>2</sub>O<sub>3</sub> interlayer effectively inhibits the self-corrosion of the Al anode. Further, the effects of the thickness of the Al<sub>2</sub>O<sub>3</sub> film on corrosion behavior were investigated. The results showed that the Al−air battery with a 4 μm Al<sub>2</sub>O<sub>3</sub> interlayer is more suitable for a low current density discharge, which could be applied for mini-watt devices. With a proper thickness of the Al<sub>2</sub>O<sub>3</sub> interlayer, corrosion of the anode was considerably suppressed without sacrificing the discharge voltage at a low current density. The Al−air battery with a 4 μm Al<sub>2</sub>O<sub>3</sub> interlayer provided a significantly high capacity (1255 mAh/g at 5 mA/cm<sup>2</sup>) and an excellent stability. This wo presents a promising approach for fabricating an inhibiting corrosion interlayer for solid Al−air battery designed for mini-watt devices.
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