# US 7,611,803 B2 · Electrochemical cell

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- Number: US 7,611,803 B2
- Document ID: US7611803B2
- Status: Granted
- Kind: B2
- Application number: 11/003,553
- Filed: 2004-12-03
- Published: 2006-06-08
- Granted: 2009-11-03
- Earliest claimed: 2004-12-03
- Assignees: Eveready Battery Company, Inc.
- Inventors: Guanghong Zheng
- Web page: https://patentgrep.com/patent/US7611803B2

## CPC

- H01M 4/12: of consumable metal or alloy electrodes (use of alloy compositions as active materials H01M4/38)
- H01M 4/06: Electrodes for primary cells
- H01M 4/50: of manganese
- H01M 4/582: {Halogenides}
- H01M 6/08: with cup-shaped electrodes
- H01M 4/625: {Carbon or graphite}
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2300/0014: Alkaline electrolytes
- H01M 2300/0085: Immobilising or gelification of electrolyte
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An alkaline electrochemical cell having an anode containing zinc and a cathode that includes a catalyst and an iodate is disclosed. The catalyst catalyzes the reduction of the iodate when the cell is discharged thereby enabling the cell to be used in devices that have a functional endpoint of 1.0V or higher. Preferred catalysts include platinum and palladium. Suitable iodates include copper iodate, strontium iodate and lead iodate.

## Claims

### Claim 1

An electrochemical cell, comprising:
(a) only two electrodes, a first electrode comprising a first electrochemically active material and a second electrode comprising a second electrochemically active material and a catalyst, wherein said second electrochemically active material consists of one or more iodates or a mixture of one or more iodates and another material selected from manganese dioxide and silver oxide, and said catalyst comprises at least one material selected from the group consisting of platinum and palladium;
(b) a separator disposed between said electrodes; and
(c) an electrolyte providing ionic conductivity between said first and second electrodes.

### Claim 2 (depends on 1)

The electrochemical cell of claim 1 wherein said iodates have a surface area greater than 0.10 m2/g and less than 100 m2/g.

### Claim 3 (depends on 2)

The electrochemical cell of claim 2, wherein said iodates have a surface area greater than 4 m2/g and less than 75 m2/g.

### Claim 4 (depends on 1)

The electrochemical cell of claim 1, wherein said catalyst is deposited on a carrier.

### Claim 5 (depends on 4)

The electrochemical cell of claim 4 wherein said catalyst has a surface area greater than 0.1 m2/g and less than 200.0 m2/g.

### Claim 6 (depends on 5)

The electrochemical cell of claim 5 wherein said catalyst has a surface area greater than 2.0 m2/g and less than 100.0 m2/g.

### Claim 7 (depends on 4)

The electrochemical cell of claim 4 wherein the carrier comprises graphite.

### Claim 8 (depends on 1)

The electrochemical cell of claim 1 wherein said iodates are selected from the group consisting of lead iodate, strontium iodate, copper iodate, barium iodate, silver iodate, potassium iodate, lithium iodate, ferrous iodate, bismuth iodate, cerium iodate, zinc iodate and calcium iodate.

### Claim 9 (depends on 1)

The electrochemical cell of claim 1 wherein said second electrochemically active material comprises a mixture of manganese dioxide and an iodate.

### Claim 10 (depends on 1)

The electrochemical cell of claim 1 wherein said second electrode further comprises graphite.

### Claim 11 (depends on 10)

The electrochemical cell of claim 10 wherein said catalyst is disposed on said graphite.

### Claim 12 (depends on 11)

The electrochemical cell of claim 11 wherein said first electrochemically active material comprises zinc.

### Claim 13 (depends on 12)

The electrochemical cell of claim 12 wherein said zinc is comminuted.

### Claim 14 (depends on 1)

The electrochemical cell of claim 1 wherein said electrolyte is an aqueous alkaline electrolyte.

### Claim 15 (depends on 14)

The electrochemical cell of claim 14, wherein said aqueous alkaline electrolyte comprises potassium hydroxide.

### Claim 16 (depends on 15)

The electrochemical cell of claim 15 wherein said concentration of potassium hydroxide is less than 45 weight percent.