for future flow batteries. Simply changing the tilt of the device could add a short infusion of power to the grid during periods of peak demand, or slowly release energy over a period of many hours to keep air conditioners and heaters running when the sun is down.
In another design,
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, the group has replaced vanadium with sulfur,
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, which is inexpensive and abundant. Dissolved in water (also cheap and plentiful), sulfur is circulated into and out of the battery’s stack, creating a reaction that stores or gives up energy,
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, similar to commercial flow batteries. The group is now refining the battery,
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, first described in 2014 in Nano Letters,
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, aiming for higher levels of energy.

Battery: Sodium-sulfur


How it works: A molten sodium core exchanges ions with sulfur through a solid electrolyte barrier

What it’s used for: Large-scale energy storage (holding power generated from wind or solar)

Advantages: Materials are cheap and abundant,
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; fairly long lifetime

Obstacles: Must operate at high temperatures,
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, so not possible to use in a car

Source: Argonne National Lab


Another challenge in developing flow batteries is finding ways to keep active materials confined to their tanks. That’s the job of the battery membrane, but because the organic molecules under consideration for battery use are almost always small,
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,

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