The devices are made of cheap and abundant materials.
Renewable energy is great, but what do you do when the sun doesn't shine, or the wind does not blow? You could use
He then decided to pair it with the cheapest of all the non-metals: sulfur. And finally, for the electrolyte, he went with a variety of molten salts that have relatively low melting points — close to the boiling point of water, as opposed to nearly 1,000 degrees Fahrenheit for many salts.“Once you get down to near body temperature, it becomes practical” to make batteries that don’t require special insulation and anticorrosion measures, he explained.
In a typical installation used for load-leveling at a solar generation facility, for example, “you’d store electricity when the sun is shining, and then you’d draw electricity after dark, and you’d do this every day. And that charge-idle-discharge-idle is enough to generate enough heat to keep the thing at temperature.”
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