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,
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, 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, 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, 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,
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, but because the organic molecules under consideration for battery use are almost always small,
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,

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