Development of vanadium solid battery with high energy density for hybrid vehicles

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Standard rate constant, which is required to evaluate the energy efficiency, is believed to be “constant". However, there are practically dependent on the concentration of active materials. In addition, our VSSB uses slurry active material with very high concentration. In this work, the dependence of the “standard rate constant" on concentration of Vanadium ions and its effect on the energy efficiency were clarified. Standard rate constants (k0) for 1 - 5 mol dm-3 in composite of “carbon fiber - slurry active material" was evaluated. On the basis of the obtained k0 values, energy efficiencies for VRFB and VSSB were calculated. In spite that k0 decreases with increasing the concentration, energy efficiency for VSSB is not decreased because of the compensation by the large concentration.