In a paper titled "High-Performance Hybrid Energy Storage with Potassium Ferricyanide Redox Electrolyte," the team from the Leibniz Institute for New Materials (INM) in Saarbrücken also described how they overcame current leakage with an ion-exchange membrane.
The team, led by Professor Volker Presser of INM’s Energy Materials program division, found the hybrid medium had an energy capacity of 28.3 watt-hours per kilogram, or 11.4 watt-hours per liter.
In Switzerland, for example, ABB is using the technology to charge electric buses in as little as 3 to 5 minutes.
ABB has also been involved in a project to use supercapacitors on Southern Pennsylvania Transit Authority trains, as a way of recovering braking energy to earn money on the PJM frequency regulation market.
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