The energy density of most redox flow batteries is too low for transport solutions but there is a Swiss company: NanoFlowcell that claims their QUANTiNO vehicle accomplished the impossible.
“The low-voltage system in the QUANTiNO works with the nanoFlowcell® drive to form an exceptionally efficient symbiosis that promises a significantly greater potential range compared with the HV systems commonly used in electric vehicles. Furthermore, it eliminates the danger of electric shocks that can be caused by a high-voltage system in the event of an accident or when undertaking repair work to HV components.”
Only data provided by the company are the test run results. Calculations based on this data gives following results:
Energy demand: 13 kWh per 100 km
Energy density: 600 Wh per liter or kilogram
Average test run speed = around 23 kph
A full tank range at this average speed: 1,400 kilometers.
Nowadays, conventional flow batteries based on vanadium sulfate theoretically achieve energy densities of up to 19 to 38 Wh/L with respect to pure electrolyte solutions. Bromine-based systems would achieve 70 Wh/kg.
It sounds like redox flow cells are not an attractive option, as not one of these cells reaches the levels of lithium-ion ones. Maybe I’m missing something? Did anyone had contact with this compay and can can confirm their results?
Maybe somene who works with redox batteries could share his opinion?
Recent article from nanoFlowcell A.G.:
https://emagazine.nanoflowcell.com/en/viewpoint/350k-kilometre-quantino-48volt/
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