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Commercial debut slated for redox flow batteries

By Gerald Ondrey |

A new concept for large-scale redox-flow batteries (RFB) for energy-storage applications has been developed by ThyssenKrupp Industrial Solutions AG (Dortmund, Germany; www.thyssenkrupp-industrial-solutions.com). The system is based on the oxidation and reduction of vanadium ions (diagram, top) for either storing electrical energy (charging), which is produced by renewable sources (solar or wind), or utilizing this energy (discharging) during periods when power generation is interrupted (windless days or nighttime). The all-vanadium RFB was designed in order to take advantage of economy-of-scale for large flow-through electrochemical cells, said Niels Bredemeyer, senior chemist at the company’s Process Technology business unit, during a congress session at Achema (June 15–19; Frankfurt, Germany). Conventional flow-through cells suffer from large pressure drops, flow maldistribution and a state-of-charge (SOC; remaining capacity of a battery) that depends on the cell height, explained Bredemeyer. These drawbacks are especially problematic when scaling up to large scale, he said. To overcome these issues, a new and unique flow regime was developed, based on the company’s experience with large-scale electrolyzers for chlor-alkali…
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