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, transportation and the electricity grid account for about two-thirds of U.S. energy use. But today, only 10 percent of the electricity on the grid is from renewable sources, according to the U.S. Energy Information Administration. If wind and solar power are ever to wrestle energy production away from fossil fuels, big changes must happen in energy storage.
What is needed, Crabtree says, is a battery that can store energy, and lots of it,
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, for later use. “Though the sun shines in the middle of the afternoon, peak demand comes at sunset when people go home, turn on lights and cook dinner,” he says.
To reliably supply electricity at night or on cloudy, windless days requires a different type of battery. By design, flow batteries fit the bill. Instead of having solid electrodes,
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, the other negatively charged. Pumps move the liquids from the tanks into a central chamber,
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, or “stack,” where dissolved molecules in the liquids undergo chemical reactions that store and give up energy. A membrane located in the stack keeps the positive and negative ions separated.

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