Redox battery

• US 4,362,791 A
• Filed: 03/23/1981
• Issued: 12/07/1982
• Est. Priority Date: 06/17/1980
• Status: Expired due to Term

• Current Assignee: Agency of Industrial Science & Technology (Government of Japan)
• Original Assignee: Agency of Industrial Science & Technology (Government of Japan), Ministry of International Trade & Industry (Government of Malaysia)
• Inventors: Nozaki, Ken, Kaneko, Hiroko
• Primary Examiner(s): Skapars, Anthony
• Application Number:
  US06/246,255
• Time in Patent Office: 624 Days
• Field of Search: 429/109, 429/101, 429/105, 429/15, 429/19, 429/27, 429/46, 429/202
• US Class Current: 429/101
• CPC Class Codes: H01M 10/36 Accumulators not provided for in groups H01M10/05-H01M10/34
• CPC Class Codes: H01M 8/184 Regeneration by electrochemical means
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

In a redox battery using a titanium redox system or chromium redox system as an active material for the negative electrode or a manganese redox system as an active material for the positive electrode, the electromotive force of the battery and the stability of electrolyte solutions are enhanced by addition of a chelating agent such as citric acid or a complexing agent such as phosphoric acid to the redox system used therein.

Claims

1. A redox battery comprising an anode, an anode chamber containing an anode electrolyte, a cathode and a cathode chamber containing a cathode electrolyte, said anode electrolyte and said cathode electrolyte each containing a redox couple, wherein said redox couple in said anode electrolyte is a Mn 3-2 redox couple and said anode electrolyte contains at least a stoichiometric amount of a complexing agent or chelating agent whereby the standard electrode potential of said redox couple in said anode electrolyte is shifted to a more negative value.

3. The redox battery of claim 1 or claim 2 wherein said complexing agent or chelating agent is selected from the group consisting of pyrophosphoric acid, EDTA, acetic acid and hydroxyethylethylenediaminetriacetic acid.

2. A redox battery comprising an anode, an anode chamber containing an anode electrolyte, a cathode and a cathode chamber containing a cathode electrolyte, said anode electrolyte and said cathode electrolyte each containing a redox couple, wherein said redox couple in said anode electrolyte is a Mn 3-2 redox couple and said anode electrolyte contains at least a stoichiometric amount of a complexing agent or chelating agent whereby said Mn 3-2 redox couple is stabilized against precipitation.

4. A redox battery comprising an anode, an anode chamber containing an anode electrolyte, a cathode and a cathode chamber containing a cathode electrolyte, said anode electrolyte and said cathode electrolyte each containing a redox couple, wherein said redox couple in said cathode electrolyte is selected from the group consisting of Ti 4-3 and Cr 3-2 and said cathode electrolyte contains at least a stoichiometric amount of a complexing agent or chelating agent whereby the standard electrode potential of said redox couple in said cathode electrolyte is shifted to a more negative value.

5. The redox battery of claim 4 wherein said complexing or chelating agent is selected from the group consisting of citric acid, EDTA, and phosphoric acid.