At an MIT startup. See: http://www.renewableenergyworld.com/rea/news/article/2014/03/liquid-metal-batteries-may-be-the-answer-for-cheap-energy-storage
"If we can get liquid-metal batteries down to $500 a kilowatt-hour, we'll change the world," Donald Sadoway, chief scientific adviser at Cambridge, Massachusetts-based Ambri Inc., said in an interview. We've heard that refrain before, haven't we? Still, it is true. - Jed
