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Flow batteries

Discussion in 'Battery Discussion' started by mr2i, Jul 31, 2013.

  1. mr2i

    mr2i New Member

    Jul 27, 2013
    Why isn't any electric car makers use flow batteries?

    Redox flow batteries, and to a lesser extent hybrid flow batteries, have the advantages of flexible layout (due to separation of the power and energy components), long cycle life (because there are no solid-solid phase transitions), quick response times, no need for "equalisation" charging (the over charging of a battery to ensure all cells have an equal charge) and no harmful emissions. Some types also offer easy state-of-charge determination (through voltage dependence on charge), low maintenance and tolerance to overcharge/ overdischarge.

    Flow batteries are normally considered for relatively large (1 kW·h – 10 MW·h) applications.

    Suitable for:
    Electric vehicles - Because flow batteries can be rapidly "recharged" by replacing the electrolyte, they can be used for applications where the vehicle needs to take on energy as fast as a combustion engined vehicle.

    Then any petrol station could have fill-refill-plug that changes the electrolyte, and you are "filled-up" in no time. And the "petrol station" could charge the electrolyte with a low power over longer time.

    Best sollution ever..
  2. curiousguy

    curiousguy curious member

    Oct 21, 2012
    Michigan, United States
    the problem with flow batteries for auto use is an intrinsic low energy density because they utilize liquid electrodes. lets look for example at the commercial cathode for Li-ionbatteries, LiCoO2. the concentration of Co (the active metal which undergoes reversible reduction/oxidation in the presence of lithium) in LiCoO2 is something like 150 M. currently flow batteries use liquid electrodes (catholytes and anolytes) with concentrations around 1 M.

    M here is molar (moles/Liter)

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