Electrolyte tanks belonging to the energy storage system in Pfinztal, near Karlsruhe, each holding 45,000 liters. The 20 MWh system, run by the Fraunhofer Institute for Chemical Technology and equipped with SGL's SIGRACELL® felt electrodes and bipolar plates is part of the RedoxWind project supported by the German federal state of Baden-Wurttemberg and the Federal Ministry of Education and Research.
Expertise for enhanced performance and service life
SGL Carbon ranks among the leading manufacturers of specialty graphite components for redox flow batteries. We have applied our long-term experience and close cooperation with customers to develop our SIGRACELL battery felts, bipolar plates and endplates. By constantly improving our materials, we significantly enhance the performance and service life of our customers’ batteries.
Optimizing performance through felt quality
Inhomogeneity in the battery felt can lead to impermeable areas that reduce overall system performance. As a result, we are continuously working on tighter tolerances for the area weight and thickness of our battery felts. This helps our customers optimize compression rates, thus ensuring the best possible battery performance.
Our SIGRACELL carbon and graphite felts are used for both anodes and cathodes and enable permeable electrodes for high-temperature batteries such as redox flow batteries. Our high-density and thin SIGRACELL bipolar plates made of expanded natural graphite can be used for a wide range of applications.