Novel vanadium halide redox flow battery

Abstract

The present invention describes a vanadium halide redox cell prior to charging, a vanadium halide redox cell in a state of charge selected from the group below, and fully charged or partially charged vanadium halide redox cells, wherein the group Consists of zero state of charge and near zero state of charge. A vanadium halide redox cell prior to charging includes a positive half-cell having a positive half-cell solution including a halide electrolyte, a vanadium(III) halide, and a vanadium(IV) halide, and a negative half-cell having a A negative half-cell solution comprising a halide electrolyte, a vanadium(III) halide and a vanadium(IV) halide, wherein the amounts of the vanadium(III) halide, vanadium(IV) halide and halide ions in the positive and negative half-cell solutions are set to such that in the first charging step comprising charging the vanadium halide redox cell prior to charging, it is possible to prepare a vanadium halide redox cell having a state of charge selected from the group consisting of zero state of charge and With a near-zero state-of-charge composition, the vanadium halide redox cell mainly includes vanadium(IV) halide in the positive half-cell solution and V(III) halide in the negative half-cell solution. A vanadium halide redox cell at a state of charge selected from the group consisting of a positive half-cell and a negative half-cell consisting of zero and near-zero states of charge, the positive half-cell having a halide electrolyte comprising: and a positive half-cell solution of a vanadium halide mainly vanadium(IV) halide, a negative half-cell having a negative half-cell solution comprising a halide electrolyte and a vanadium halide mainly of a vanadium(III) halide, wherein the positive half-cell solution The amount of vanadium(IV) halide and the amount of vanadium(III) halide in the negative half-cell solution are set such that the vanadium halide redox cell is at a state of charge selected from the group consisting of zero state of charge and close to zero state of charge composition. A fully charged vanadium halide redox cell consists of a positive half cell with a positive half cell comprising a halide electrolyte, a polyhalide complex, a vanadium(IV) halide, and a vanadium(V) halide solution, the negative half-cell has a negative half-cell solution comprising a halide electrolyte and a vanadium(II) halide, wherein the molar concentration of vanadium(V) and polyhalide complexes: the molar concentration of vanadium(II) halide is approximately stoichiometrically balanced. A partially charged vanadium halide redox cell includes a positive half cell with a positive half cell including a halide electrolyte, a polyhalide complex, a vanadium(IV) halide, and a vanadium(V) halide solution, the negative half-cell has a negative half-cell solution comprising a halide electrolyte, a vanadium (II) halide and a vanadium (III) halide, wherein the number of moles of the polyhalide complex and the vanadium (V) halide: vanadium halide ( The moles of II) are approximately stoichiometrically balanced.

Description

technical field [0001] The present invention discloses a vanadium halide redox flow battery, which uses a 50:50 vanadium (III) / (IV) halide solution as the initial feeding electrolyte solution in the positive and negative half cells. The present invention also discloses a 50:50 halide V(III) / V(IV) feed solution for use in the positive and negative half-cells of a vanadium halide redox flow battery. The present invention also discloses a vanadium halide redox flow battery, wherein the initial feed solution of the negative half cell is a vanadium (III) halide electrolyte, and the vanadium (IV) halide electrolyte is used as the feed feed solution of the positive half cell. electrolytic solution. The present invention also discloses a method of producing a halogenated vanadium(III), vanadium(IV), vanadium(III) / (IV) electrolyte for a vanadium halide redox flow battery. In addition, the present invention also discloses a method of generating electricity by discharging a fully charg...

AI Technical Summary

Problems solved by technology

This means that the positive half-cell electrolyte always contains excess bromine or the relatively unstable Br 3 - or Br 2 Cl - components, which may cause bromine outgassing problems during the operation of vanadium bromide cells

In addition, the presence of excess bromine in the positive half-cell electrolyte increases the corrosive properties of this solution, thereby reducing the life of the battery components

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