Concentrated vrfb electrolyte composition and method for producing same

Abstract

There is disclosed a method for producing a concentrated VRFB electrolyte composition. The method comprises the following steps: (a) mixing a vanadium, oxide, water and aqueous H2SO4 in sufficient quantities to produce a reaction mixture comprising a vanadium sulfate at a concentration at least 3.0 M and a total sulfate concentration of at least 2 times the concentration of the vanadium sulfate; (b) maintaining the reaction mixture at an initial temperature that substantially avoids precipition of reaction solids; (c) allowing the reaction mixture to reach ambient temperature: and (d) increasing the viscosity of the reaction mixture to produce the concentrated VRFB electrolyte composition. There is also disclosed a concentrated VRFB electrolyte composition. The concentrated VRFB electrolyte is believed to provide advantages include reduced shipping costs, logistics and on-site capital costs at the facility using the VRFBs.

Dependencies are inferred from the claim text.