Energy storage is a big focus of research at ARPA-E. Here is MIT professor Donald Sadoway showing a model of a liquid metal battery his group intends to make. The idea is to assemble a battery with two liquid metals which don't mix (like oil and water don't mix) and a molten salt electrolyte. Because the three materials are of different density, they will form three layers. The design promises simplicity and long life and very high energy density. A spinoff company, called Liquid Metal Battery, hopes to have utilities use it to store hours of solar and wind power, which is considered by many the holy grail of energy storage.
March 3, 2011 9:31 AM PST
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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