Can iron-based aqueous flow batteries be used for grid energy storage?
A new iron-based aqueous flow battery shows promise for grid energy storage applications. A commonplace chemical used in water treatment facilities has been repurposed for large-scale energy storage in a new battery design by researchers at the Department of Energy's Pacific Northwest National Laboratory.
What is an iron flow battery?
In the 1970s, scientists at the National Aeronautics and Space Administration (NASA) developed the first iron flow batteries using an iron/chromium system for photovoltaic applications. Over the next decade, these unique systems, which combine charged iron with an aqueous liquid energy carrier, were improved upon for large-scale energy storage.
Are flow batteries a good energy storage device?
When the battery is hooked up to an external circuit, that energy can be used provide power as needed. What’s advantageous about flow batteries compared to other types of energy storage devices is that they are easily scalable. The larger the electrolyte supply tank, the more energy that can be stored within the battery.
Are iron flow batteries a good choice?
“The new iron flow battery is a good candidate for longer duration batteries, with discharge over 10-20 hours,” he said. “And we have improved on this old design because of a fundamental understanding of both the battery and the material design. By engaging in a deep dive into the materials, we discovered things we didn’t know before.
Are iron flow batteries soluble?
“With these conventional iron flow batteries, the liquid is on the cathode, and they use a fully dissolved catholyte. But on the anode side, they take advantage of iron plating,” Li said. “We wanted to find a way to make the battery full flow, entirely soluble, and remove the iron plating so that we could improve upon the original design.”
Are iron-based batteries a good choice for energy storage?
For comparison, previous studies of similar iron-based batteries reported degradation of the charge capacity two orders of magnitude higher, over fewer charging cycles. Iron-based flow batteries designed for large-scale energy storage have been around since the 1980s, and some are now commercially available.
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