# US 2021/0280931 A1 · Metal-air cells with minimal air access

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2021/0280931 A1
- Document ID: US20210280931A1
- Status: Published application
- Kind: A1
- Application number: 17/328,308
- Filed: 2021-05-24
- Published: 2021-09-09
- Earliest claimed: 2018-12-27
- Assignees: Energizer Brands, LLC
- Applicants: Energizer Brands, LLC
- Inventors: Ian Pozdol; Marc Syvertsen; Tony Rubsam; Kokkie Schnetz
- Web page: https://patentgrep.com/patent/US20210280931A1

## CPC

- H01M 12/06: with one metallic and one gaseous electrode
- H01M 4/244: {Zinc electrodes}
- H01M 12/02: Details (of electrodes H01M4/00; of non-active parts H01M50/00)
- H01M 50/1385: {Hybrid cells}
- H01M 50/394: {Gas-pervious parts or elements}
- H01M 6/045: {characterised by aqueous electrolyte}
- H01M 8/0668: Removal of carbon monoxide or carbon dioxide
- H01M 2300/0014: Alkaline electrolytes
- 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

The present technology provides a battery that includes an air cathode, an anode, an aqueous electrolyte that includes an amphoteric surfactant, and a housing that includes one or more air access ports defining a total area of void space (“vent area”), where (1) the battery is a size 13 metal-air battery and the total vent area defined by all of the air access ports is from about 0.050 mm2 to about 0.115 mm2; or (2) the battery is a size 312 metal-air battery and the total vent area defined by all of the air access ports is from about 0.03 mm2 to about 0.08 mm2.

## Claims

### Claim 1

A battery comprising an air cathode, an anode, an aqueous electrolyte, and a housing, wherein:
the housing comprises one or more air access ports defining a total vent area;
the battery having a nominal electrode interfacial area;
a ratio of total vent area to nominal electrode interfacial area is from about 0.0014 to about 0.0024; and
the aqueous electrolyte comprises an amphoteric fluorosurfactant.

### Claim 2 (depends on 1)

The battery of claim 1, wherein the battery is a size 13 metal-air battery having a nominal diameter of about 8 mm and a nominal height of about 5.4 mm.

### Claim 3 (depends on 1)

The battery of claim 1, wherein the battery is a size 312 metal-air battery having a nominal diameter of about 8 mm and a nominal height of about 3.6 mm.

### Claim 4 (depends on 1)

The battery of claim 1, wherein the battery has a nominal external volume from about 180 mm3 to about 270 mm3.

### Claim 5 (depends on 1)

The battery of claim 1, wherein the nominal electrode interfacial area is about 35 mm2.

### Claim 6 (depends on 1)

The battery of claim 1, wherein the total vent area is from about 0.030 mm2 to about 0.115 mm2.

### Claim 7 (depends on 1)

The battery of claim 1, wherein the total vent area is about 0.0498 mm2 to about 0.0845 mm2.

### Claim 8 (depends on 1)

The battery of claim 1, wherein ratio of total vent area to nominal electrode interfacial area is about 0.0014.

### Claim 9 (depends on 1)

The battery of claim 1, wherein ratio of total vent area to nominal electrode interfacial area is about 0.0024.

### Claim 10 (depends on 1)

The battery of claim 1, wherein the anode comprises zinc.

### Claim 11 (depends on 1)

The battery of claim 1 further comprising a carbon dioxide scrubbing agent.

### Claim 12 (depends on 10)

The battery of claim 10, further comprising an air diffusion pad and the air diffusion pad comprises the carbon dioxide scrubbing agent.

### Claim 13 (depends on 1)

The battery of claim 1, wherein the amphoteric fluorosurfactant comprises betaine functionality.

### Claim 14 (depends on 1)

The battery of claim 1, wherein the aqueous electrolyte comprises about 500 ppm to about 20,000 ppm lithium hydroxide.

### Claim 15 (depends on 1)

The battery of claim 1, wherein the total vent area defined by all of the air access ports is from about 0.03 mm2 to about 0.08 mm2.

### Claim 16

A battery comprising an air cathode, an anode, an aqueous electrolyte, and a housing, wherein:
the housing comprises one or more air access ports defining a vent area;
the aqueous electrolyte comprises an amphoteric fluorosurfactant; and
the total vent area is from 45% to 63% less than a comparable battery without the amphoteric fluorosurfactant while providing the same or greater current draw.