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AssigneePinnacle ARB Limited
InventorsMaria Skyllas Kazacos, Michael Kazacos
Estimating the term…
A method for stabilizing an electrolyte for use in a redox cell, in particular for stabilizing an electrolyte for use in an all-vanadium redox cell, a stabilized electrolyte, in particular an all-vanadium stabilized electrolyte, a redox cell, in particular an all-vanadium redox cell, comprising the stabilized electrolyte, a redox battery, in particular an all-vanadium redox battery, comprising the stabilized electrolyte, a process for recharging a discharged or partially discharged redox battery, in particular an all-vanadium redox battery, comprising the stabilized electrolyte, and a process for the production of electricity from a charged redox battery, and in particular a charged all-vanadium redox battery, comprising the stabilized electrolyte are disclosed. Also disclosed are a redox battery/fuel cell and a process for the production of electricity from a redox battery/fuel cell.
An all vanadium redox battery having a positive compartment containing a catholyte in electrical contact with a positive electrode, the catholyte comprising an electrolyte containing vanadium ions selected from the group consisting of trivalent vanadium ions, tetravalent vanadium ions, pentavalent vanadium ions, and a mixture of at least two of trivalent vanadium ions, tetravalent vanadium ions, and pentavalent vanadium ions, a negative compartment containing an anolyte in electrical contact with a negative electrode, the anolyte comprising an electrolyte containing vanadium ions selected from the group consisting of tetravalent vanadium ions, trivalent vanadium ions selected from the group consisting of tetravalent vanadium ions, trivalent vanadium ions, divalent vanadium ions, and a mixture of at least two of divalent vanadium ions, trivalent vanadium ions, and tetravalent vanadium ions, and a separator or membrane disposed between the positive and negative compartments and in contact with the catholyte and anolyte to provide ionic communication there between and wherein at least one of the anolyte and catholyte is a stabilized all-vanadium electrolyte solution comprising vanadium redox ions, an electrolyte and a stabilizing amount of a stabilizing agent, wherein precipitation of vanadium species from the solution is prevented or reduced when the vanadium ion concentration exceeds the saturation solubility of the vanadium ions in the electrolyte including during electrolyte solution preparation or operation of said redox cell, and wherein the stabilizing amount of the stabilizing agent is less than 20% mole/mole of stabilizing agent to vanadium redox ions, the amount being less than that required to fully complex the vanadium redox ions in the electrolyte solution.
An all-vanadium redox/fuel cell having a positive compartment containing a catholyte in electrical contact with a catholyte contacting portion of a positive electrode, said catholyte contacting portion being disposed in said positive compartment, said positive electrode being selected from the group consisting of an oxidising gas electrode, an oxygen electrode and an air electrode, the catholyte comprising an electrolyte containing vanadium redox ions selected from the group consisting of a vanadium redox couple, vanadium redox ions and a mixture of a vanadium redox couple and vanadium redox ions, a negative compartment containing an anolyte in electrical contact with a negative electrode, the anolyte comprising an electrolyte containing vanadium redox ions selected from the group consisting of vanadium redox couple, vanadium redox ions and a mixture of vanadium redox couple and vanadium redox ions, and a separator or membrane disposed between the positive and negative compartments and in contact with the catholyte and anolyte to provide ionic communication therebetween, at least one of the electrolytes having a stabilising amount of a stabilising agent for stabilising the vanadium redox ions in at least one of the electrolyte(s), wherein precipitation of vanadium species from the electrolyte solution is prevented or reduced when the vanadium ion concentration exceeds the saturation solubility of the vanadium ions in the electrolyte including during electrolyte solution preparation or operation of said redox cell, and wherein the stabilising amount of the stabilising agent is less than that required to fully complex the vanadium redox ions in at least one of the electrolytes, said positive electrode having a gas contacting portion said gas contacting portion being disposed so as to be capable of contacting a gas selected from the group consisting of an oxidising gas, oxygen containing gas, and air.
An all-vanadium redox/fuel cell having a positive compartment containing a catholyte in electrical contact with a positive electrode, the catholyte comprising an electrolyte containing vanadium redox ions selected from the group consisting of a vanadium redox couple, vanadium redox ions and a mixture of vanadium redox couple and vanadium redox ions, a negative compartment containing an anolyte in electrical contact with an anolyte contacting portion of a negative electrode, said anolyte contacting portion of said negative electrode being disposed in said negative compartment, said negative electrode being selected from the group consisting of a reducing gas electrode, a hydrogen gas electrode, the anolyte comprising an electrolyte containing vanadium redox ions selected from the group consisting of vanadium redox couple, vanadium redox ions and a mixture of vanadium redox couple and vanadium redox ions, and a separator or membrane disposed between the positive and negative compartments and in contact with the catholyte and anolyte to provide ionic communication therebetween, at least one of the electrolytes having a stabilising amount of a stabilising agent for stabilising the vanadium redox ions in at least one of the electrolyte(s), wherein precipitation of vanadium species from at least one of the electrolyte(s) is prevented or reduced when the vanadium ion concentration exceeds the saturation solubility of the vanadium ions in the electrolyte including during electrolyte solution preparation or operation of said redox cell, and wherein the stabilizing amount of the stabilising agent is less than that required to fully complex the vanadium redox ions in at least one of the electrolytes, said negative electrode having a gas contacting portion said gas contacting portion being disposed so as to be capable of contacting a gas selected from the group consisting of a reducing gas, a hydrogen containing gas, and hydrogen.
An all-vanadium redox/fuel cell having a positive electrode being selected from the group consisting of an oxidising gas electrode, an oxygen electrode and an air electrode, a negative compartment containing an anolyte in electrical contact with a negative electrode, the anolyte comprising an electrolyte containing vanadium redox ions selected from the group consisting of vanadium redox couple, vanadium redox ions and a mixture of vanadium redox couple and vanadium redox ions, and a separate or membrane disposed between the positive electrode and negative compartment and in contact with the cathode and anolyte to provide ionic communication therebetween, the anolyte having a stabilising amount of a stabilising agent for stabilising the vanadium redox ions in the electrolyte, wherein precipitation of vanadium species from the electrolyte solution is prevented or reduced when the vanadium ion concentration exceeds the saturation solubility of the vanadium ions in the electrolyte including during electrolyte solution preparation or operation of said redox cell, and wherein the stabilising amount of the stabilising agent is less than that required to fully complex the vanadium redox ions in the electrolyte, said positive electrode having a gas contacting portion said gas contacting portion being disposed so as to be capable of contacting a gas selected from the group consisting of an oxidising gas, oxygen, an oxygen containing gas, and air.
An all-vanadium redox/fuel cell having a positive compartment containing a catholyte in electrical contact with a positive electrode, the catholyte comprising an electrolyte containing vanadium redox ions selected from the group consisting of a vanadium redox couple, vanadium redox ions and a mixture of a vanadium redox couple and vanadium redox ions, a negative electrode being selected from the group consisting of a reducing gas electrode, a hydrogen gas electrode, and a separator or membrane disposed between the positive compartment and negative electrode and in contact with the catholyte and anode to provide ionic communication therebetween, the catholyte having a stabilising amount of a stabilising agent for stabilising the vanadium redox ions in the electrolyte, wherein precipitation of vanadium species from the electrolyte solution is prevented or reduced when the vanadium ion concentration exceeds the saturation solubility of the vanadium ions in the electrolyte including during electrolyte solution preparation or operation of said redox cell, and wherein the stabilising amount of the stabilising agent is less than that required to fully complex the vanadium redox ions in the electrolyte, said negative electrode having a gas contacting portion said gas contacting portion being disposed so as to be capable of contacting a gas selected from the group consisting of a reducing gas, a hydrogen containing gas, and hydrogen.
Dependencies are inferred from the claim text.