SAN FRANCISCO / LONDON (IT BOLTWISE) – A US startup has developed a new generation of redox flow batteries based on zinc polyiodide. This innovation promises higher energy density and more environmentally friendly solutions compared to traditional vanadium-based batteries. The technology could revolutionize the storage of excess electricity from renewable energy sources.
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Redox flow batteries have long been known as reliable electricity storage devices, especially for large photovoltaic and wind turbines. Their ability to store energy for extended periods of time and release it when needed makes them an ideal solution for storing excess electricity from renewable energy sources. But the conventional variants based on vanadium compounds are often expensive and polluting. A US startup, The BESSt Company, has now developed a promising alternative: redox flow batteries with zinc polyiodide.
The new battery variant is characterized by a higher energy density, which, according to the manufacturer, is up to 20 times higher than conventional vanadium-based models. With 320 watt hours per liter, it not only offers a space-saving but also cost-effective and environmentally friendly solution. This innovation could fundamentally change the way we store and use energy.
A key advantage of redox flow technology is its scalability. The battery fluids are stored in external tanks and are only pumped through an electrochemical cell during charging or discharging. This allows for almost unlimited storage capacity expansion by simply adding additional tanks. The use of zinc polyiodide as an electrolyte could also circumvent the ecological and economic challenges of vanadium extraction.
The launch of these new batteries will initially target the commercial sector, particularly public authorities and critical infrastructures that require high reliability and security of energy supply. According to Joley Michaelson, CEO of The BESSt Company, the batteries should also be available in residential areas from 2028. The lifespan of the systems is estimated at 20 to 30 years, making them a long-term economical investment.
The Jülich Research Center is also working on the further development of redox flow batteries with zinc iodide. In the medium term, these could close a gap in the area of small to medium-sized network storage. However, the challenge is to solve technical problems such as the formation of metallic dendrites in the electrochemical cell, which could affect the efficiency. Whether The BESSt Company has already solved these problems remains to be seen in practice.
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