# US 2014/0193720 A1 · Air battery

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- Number: US 2014/0193720 A1
- Document ID: US20140193720A1
- Status: Published application
- Kind: A1
- Application number: 14/125,704
- Filed: 2011-06-15
- Published: 2014-07-10
- Earliest claimed: 2011-06-15
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Inventors: Fuminori Mizuno
- Web page: https://patentgrep.com/patent/US20140193720A1

## CPC

- H01M 4/96: Carbon-based electrodes
- H01M 12/06: with one metallic and one gaseous electrode
- H01M 12/08: composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- Y02E 60/10: Energy storage using batteries
- Y10S 977/742: Carbon nanotubes, CNTs
- Y10S 977/948: Energy storage/generating using nanostructure, e.g. fuel cell, battery
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

The preset invention is to provide an air battery including, in an air electrode layer, a needle-shaped carbon material having more reaction starting points of oxygen reduction reaction than conventional carbon materials. Disclosed is an air battery including at least an air electrode, a negative electrode and an electrolyte layer disposed between the air electrode and the negative electrode, wherein the air electrode is provided with at least an air electrode layer, and the air electrode layer contains a needle-shaped carbon material having an average aspect ratio of 10 or more and a DIG ratio of 0.1 or more.

## Claims

### Claim 1

An air battery comprising at least an air electrode, a negative electrode and an electrolyte layer disposed between the air electrode and the negative electrode,
wherein the air electrode is provided with at least an air electrode layer, and
the air electrode layer contains a needle-shaped carbon material having an average aspect ratio of 10 or more and a D/G ratio of 0.1 or more.

### Claim 2 (depends on 1)

The air battery according to claim 1, wherein an average lattice spacing of (002) plane of the needle-shaped carbon material is 0.335 nm or more and less than 0.370 nm.

### Claim 3 (depends on 1)

The air battery according to claim 1, wherein the needle-shaped carbon material has a BET specific surface area of 10 to 3,000 m2/g.

### Claim 4 (depends on 1)

The air battery according to claim 1, wherein the needle-shaped carbon material is a cup-stacked carbon nanotube.