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+Robert Llewellyn have you seen this /. article about IBM developing an air-breathing lithium battery. Should enable elec-cars to reach 500miles, is lighter than li-ion, and has 15x more energy density (than li-ion).

Could be a few years before this tech comes to fruition, though (e.g. 2018-2020).

MrSeb writes "As part of IBM's Battery 500 project — an initiative started in 2009 to produce a battery capable of powering a car for 500 miles — Big Blue has successfully demonstrated a ligh...
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