Aluminium-air batteries or Al-air batteries produce electricity from the
reaction of oxygen in the air with aluminium. They have one of the highest energy densities of all batteries, but they are not widely used because of problems with high anode cost and byproduct removal when using traditional electrolytes and this has restricted their use to mainly military applications. However, an electric vehicle with aluminium batteries has the potential for up to eight times the range of a lithium-ion battery with a significantly lower total weight.[1]
https://en.wikipedia.org/wiki/Aluminium%E2%80%93air_battery