A U.S. company is designing a large battery that it says could help decarbonize the nation’s power sector more cheaply than lithium-ion storage systems—and with domestic materials.
The concept, known as the “iron-air battery,” has impressed U.S. experts. Unlike current lithium-ion batteries that require expensive materials mostly from other countries such as lithium, cobalt, nickel and graphite, the proposed battery stores electricity using widely available iron metal.
It operates on what scientists call the principle of “reversible rusting.” The low cost and high availability of iron could allow iron-air batteries to store electricity for several days during periods of low solar and wind power generation. One such iron-air battery is being designed by Form Energy, a company based in Massachusetts that’s co-run by a former Tesla Inc. official.
Although iron-air…