"The key to this new technology is that the metals that would normally be solids in a conventional battery have been broken into nano-size particles that are suspended in a liquid. The batteries, known as "semi-solid flow cells," store their power in a black gunk that looks like motor oil, which has earned it the nickname "Cambridge Crude." Because charge is stored in this liquid, it would be possible to "fuel up" an electric car with charged liquid electrolyte, just like fueling up at a conventional gas pump."
http://www.grist.org/list/2011-06-08-no-joke-this-is-the-biggest-battery-breakthrough-ever
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