Aluminium batteries are interesting and may be promising. According to Wikipedia, in 2002 Yang and Knickle concluded: The Al/air battery system can generate en

Aluminium batteries are interesting and may be promising. According to Wikipedia, in 2002 Yang and Knickle concluded: The Al/air battery system can generate enough energy and power for driving ranges and acceleration similar to gasoline powered cars...the cost of aluminium as an anode can be as low as US$ 1.1/kg as long as the reaction product is recycled. The total fuel efficiency during the cycle process in Al/air electric vehicles (EVs) can be 15% (present stage) or 20% (projected), comparable to that of internal combustion engine vehicles (ICEs) (13%). The design battery energy density is 1300 Wh/kg (present) or 2000 Wh/kg (projected). The cost of battery system chosen to evaluate is US$ 30/kW (present) or US$ 29/kW (projected). Al/air EVs life-cycle analysis was conducted and compared to lead/acid and nickel metal hydride (NiMH) EVs. Only the Al/air EVs can be projected to have a travel range comparable to ICEs. From this analysis, Al/air EVs are the most promising candidates compared to ICEs in terms of travel range, purchase price, fuel cost, and life-cycle cost. Interestingly, Al batteries are missing from the MIT battery primer [0]. [0] http://web.mit.edu/2.009/www/resources/mediaAndArticles/batteriesPrimer.pdf http://web.mit.edu/2.009/www/resources/mediaAndArticles/batt...