Study on the conductivities of V(Ⅴ) solution of vanadium flow battery

As one of the most feasible large scale energy storage technology of electrical energy, vanadium redox flow battery has been combined with non-continuous renewable power sources such as solar or wind power. In the VFB, the electrolyte is one of the most important components. It is not only the conductor of the ions but also the energy-store medium. The research on thermodynamics of the electrolyte will be of great value to having an adequate understanding of the nature of the electrolyte for providing clues to optimize the overall performance of the VFB. The conductivities of aqueous solution V(Ⅴ) sulfuric acid with various molalities are measured in the temperature range of 278.15~318.15 K. The conductivities of V(Ⅴ) +H₂SO₄+H₂O ternary system was analyzed and the conductivities binary system V(Ⅴ) aqueous solution was obtained by extrapolation, the effects of concentration and temperature on the ionic limiting molar conductivity, stocks radius, the transport number, diffusion coefficient and conductance activation energy were studied and discussed.