Form Energy reveals 100-hour storage chemistry

Form Energy reveals 100-hour storage chemistry

Form Energy reveals 100-hour storage chemistry 150 150 Energy Storage Journal

August 5, 2021: Form Energy on July 22 revealed the chemistry of its first commercial product, which it says can deliver electricity for 100 hours at less than a tenth of the cost of a lithium-ion battery.

Its first system will be with the Minnesota utility Great River Energy.

The firm also announced a $200 million Series D financing round, led by international steel and mining company Arcelor Mittal’s XCarb innovation fund.

“We have reinvented the iron-air battery to optimize it for multi-day energy storage for the electric grid,” said CEO and co-founder Mateo Jaramillo. “With this new technology, we are tackling the biggest barrier to deep carbonization: making renewable energy available when and where it’s needed, even during multiple days of extreme weather or grid outages.”

Headquartered in Massachusetts, Form Energy uses ‘reversible rusting’ in its battery. This means that while the battery discharges it breathes in oxygen from the air, and converts iron metal to rust. “While charging, the application of an electrical current converts the rust back to iron and the battery breathes out oxygen,” the company says.

It says that each battery is about the size of a washing machine, and filled with a water-based, non-flammable electrolyte much like that in a standard AA battery.

“Instead of the liquid electrolyte are stacks of between 10 and 20 metre cells, which include iron electrodes and air electrodes,” it says.

“Our batteries complement the function of lithium-ion batteries, allowing for an optimal balance of our technology and lithium batteries.”

Form Energy is working with ArcelorMittal to develop iron materials for battery systems. They plan to source iron domestically and make the batteries near where they will be deployed.