All-vanadium liquid flow battery energy storage container

Vanadium Flow Batteries use vanadium flow battery technology, a rechargeable flow battery technology that stores energy using the ability of vanadium to exist in solution in four different oxidation states. This property of vanadium allows it to produce batteries with...

Vanadium flow batteries “have by far the longest lifetimes” of all batteries and are able to perform over 20,000 charge-and-discharge cycles—equivalent to operating for 15–25 years—with minimal performance decline, said Hope Wikoff, an analyst with the US National Renewable Energy Laboratory.

The Anglo-American firm Invinity Energy Systems claims to be the world's biggest vanadium flow-battery supplier; it has more than 275 in operation and a growing number of projects planned. The company builds its batteries inside 6 m long shipping containers, making them easy to transport and ready to plug in once on site.

In the catholyte, the electrolyte at the cell's cathode side, vanadium switches between states +4 and +5. The Anglo-American firm Invinity Energy Systems claims to be the world's biggest vanadium flow-battery supplier; it has more than 275 in operation and a growing number of projects planned.

By 2030, flow batteries could be storing about 61 MW h of electricity each year and generating annual sales for producers of more than $22 billion, Zulch said. “We have a big opportunity here. The numbers are staggering.” Energy companies are obvious customers.

Hundreds of flow batteries are already in commercial use. Almost all have a vanadium-saturated electrolyte—often a mix of vanadium sulfate and sulfuric acid—since vanadium enables the highest known energy density while maintaining long battery life.