Apparently aluminium has the highest energy density per unit volume of any material. It can be smelted from ore or recycled oxide using green electricity. People have made batteries using aluminium but they have problems like getting gunked up with Aluminium hydroxide etc. How about burning two aluminium wires by striking up an electric arc between them? If the temperature is high enough I guess the aluminium oxide will come off as a vapour rather than coating the wires and stopping the combustion. The light and heat could be turned into electricity using photovoltaic cells and thermocouples and could be used to run an electric motor to drive a vehicle. The oxide ash could be captured and recycled.