What are vanadium redox flow batteries?

Vanadium redox flow batteries (VRFBs) provide long-duration energy storage. VRFBs are stationary batteries which are being installed around the world to store many hours of generated renewable energy. VRFBs have an elegant and chemically simple design, with a single element of vanadium used in the vanadium electrolyte solution.

Will flow battery suppliers compete with metal alloy production to secure vanadium supply?

Traditionally, much of the global vanadium supply has been used to strengthen metal alloys such as steel. Because this vanadium application is still the leading driver for its production, it’s possible that flow battery suppliers will also have to compete with metal alloy production to secure vanadium supply.

Why are vanadium batteries so expensive?

Vanadium makes up a significantly higher percentage of the overall system cost compared with any single metal in other battery technologies and in addition to large fluctuations in price historically, its supply chain is less developed and can be more constrained than that of materials used in other battery technologies.

How efficient are flow batteries compared to Li-ion batteries?

Flow batteries average between 70%-85% round-trip efficiency, compared with 90%-95% average for Li-ion batteries, potentially affecting the economics of projects based around bulk shifting of energy.

Are flow batteries a barrier to long-duration storage capacity?

As mentioned earlier, one barrier for flow batteries has been the limited number of deployments historically relative to Li-ion technologies. However, as demand for long-duration storage capability grows, flow batteries and especially VRFBs are poised to accelerate in deployment capacity.

What is a flow battery?

Flow batteries are durable and have a long lifespan, low operating costs, safe operation, and a low environmental impact in manufacturing and recycling. Key advantages of VRFBs include the flexibility and scalability of the technology, allowing it to cover several applications in the storage market.