Researchers at MIT and other universities have created an aluminum-sulfur battery that is cheaper and more effective than lithium-ion.
— the most abundant metal on Earth — does. “So, I said, well, let’s just make that a bookend. It’s gonna be aluminum,” he says.
The researchers tried some polymers, but ended up looking at a variety of molten salts that have relatively low melting points — close to the boiling point of water instead of the nearly 1,000º F 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 says.
The chloro-aluminate salt they chose “essentially retired these runaway dendrites, while also allowing for very rapid charging,” Sadoway says. “We did experiments at very high charging rates, charging in less than a minute, and we never lost cells due to dendrite shorting.”
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