Electrospun Al2 O3 film as inhibiting corrosion interlayer of anode for solid aluminum–air batteries

Abstract

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 Al2 O3 interlayer on to the surface of the anode. The Al2 O3 interlayer effectively inhibits the self-corrosion of the Al anode. Further, the effects of the thickness of the Al2 O3 film on corrosion behavior were investigated. The results showed that the Al–air battery with a 4 µm Al2 O3 interlayer is more suitable for a low current density discharge, which could be applied for mini-watt devices. With a proper thickness of the Al2 O3 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 Al2 O3 interlayer provided a significantly high capacity (1255 mAh/g at 5 mA/cm2) 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.