Praia Flow Battery

The development of this new flow battery marks a significant milestone in energy storage technology. Unlike conventional batteries, this high-current density, water-based battery is designed for residential use, allowing households to store solar energy more effectively.

In a groundbreaking development poised to transform the energy landscape, scientists have unveiled a revolutionary water-based flow battery that promises safer, more affordable, and efficient energy storage for households, marking a significant leap forward in the quest for sustainable power solutions.

Giant devices called flow batteries, using tanks of electrolytes capable of storing enough electricity to power thousands of homes for many hours, could be the answer. But most flow batteries rely on vanadium, a somewhat rare and expensive metal, and alternatives are short-lived and toxic.

The work is part of a wave of advances generating optimism that a new generation of flow batteries will soon serve as a backstop for the deployment of wind and solar power on a grand scale. “There is lots of progress in this field right now,” says Ulrich Schubert, a chemist at Friedrich Schiller University in Jena, Germany.

Because flow batteries store charge in tanks of electrolytes, they can be scaled up as a backup source of grid power. A new design relies on ferrocyanide to capture and release electrons. Commercial flow batteries, such as this zinc-bromine system from Redflow, are helping back up renewables.

A recent article in PV Magazine highlights the growing recognition of flow batteries' unique strengths in grid-scale storage. Unlike lithium-ion, flow batteries offer decoupled power and energy, meaning storage capacity can be increased simply by adding more electrolyte.