Metal-air battery

Patent metadata

Field	Value
Publication number	US-10505171-B2
Application number	US-201615557981-A
Country	US
Kind code	B2
Filing date	Feb 18, 2016
Priority date	Mar 24, 2015
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

A metal-air battery (1) includes a tubular positive electrode (2) centered on a predetermined central axis (J1), a negative electrode (3) opposing an inner side surface of the positive electrode, and an electrolyte layer (4) disposed between the negative electrode and the positive electrode. The positive electrode includes a positive electrode conductive layer (21), a positive electrode catalyst layer (22), and a positive electrode current collector (24). The positive electrode catalyst layer is formed on the outer side surface of the tubular positive electrode conductive layer centered on the central axis and has lower electrical conductivity than the positive electrode conductive layer. The positive electrode current collector is formed on an area of the outer side surface of the positive electrode conductive layer where the positive electrode catalyst layer does not exist, to be in direct contact with the outer side surface. This structure reduces the electrical resistance between the positive electrode conductive layer and the positive electrode current collector and improves battery performance. Since the thickness in the radial direction of the positive electrode current collector is greater than that of the positive electrode catalyst layer, the positive electrode current collector and a connection terminal can be easily connected to each other.

First claim

The invention claimed is:

1. A metal-air battery comprising:
a tubular positive electrode centered on a predetermined central axis;
a negative electrode opposing an inner side surface of said positive electrode; and
an electrolyte layer disposed between said negative electrode and said positive electrode,
wherein said positive electrode includes:
a tubular positive electrode conductive layer centered on said central axis;
a positive electrode catalyst layer formed on an outer side surface of said positive electrode conductive layer and having lower electrical conductivity than said positive electrode conductive layer; and
a positive electrode current collector formed on an area of said outer side surface of said positive electrode conductive layer where an axially-extending gap is formed in said positive electrode catalyst layer does not exist, to be in direct contact with said outer side surface along said gap, and
a thickness in a radial direction of said positive electrode current collector is greater than a thickness in the radial direction of said positive electrode catalyst layer.

2. The metal-air battery according to claim 1 , wherein
said positive electrode conductive layer is made of conductive ceramic, and
said positive electrode current collector is made of solder that is capable of forming a bond with ceramic.

3. The metal-air battery according to claim 1 , wherein
said positive electrode conductive layer, said positive electrode catalyst layer, and said positive electrode current collector are each made of a perovskite type oxide.

4. The metal-air battery according to claim 1 , further comprising:
a conductive plate having a plate-like shape that extends at least in an axial direction along said central axis and having higher electrical conductivity than said positive electrode current collector,
wherein said positive electrode current collector extends in said axial direction on said outer side surface of said positive electrode conductive layer, and
said conductive plate is bonded to approximately a whole in said axial direction of said positive electrode current collector.

5. The metal-air battery according to claim 4 , wherein
said conductive plate is bonded to a positive electrode current collector of another metal-air battery that has a structure similar to a structure of said metal-air battery.

6. A metal-air battery comprising:
a tubular positive electrode centered on a predetermined central axis;
a negative electrode opposing an inner side surface of said positive electrode; and
an electrolyte layer disposed between said negative electrode and said positive electrode,
wherein said positive electrode includes:
a tubular positive electrode conductive layer centered on said central axis;
a positive electrode catalyst layer formed on an outer side surface of said positive electrode conductive layer and having lower electrical conductivity than said positive electrode conductive layer; and
a positive electrode current collector formed on an area of said outer side surface of said positive electrode conductive layer where said positive electrode catalyst layer does not exist, to be in direct contact with said outer side surface, and
a thickness in a radial direction of said positive electrode current collector is greater than a thickness in the radial direction of said positive electrode catalyst layer,
wherein said positive electrode conductive layer is made of conductive ceramic, and
said positive electrode current collector is made of solder that is capable of forming a bond with ceramic, and
further comprising:
a conductive plate having a plate-like shape that extends at least in an axial direction along said central axis and having higher electrical conductivity than said positive electrode current collector,
wherein said positive electrode current collector extends in said axial direction on said outer side surface of said positive electrode conductive layer, and
said conductive plate is bonded to approximately a whole in said axial direction of said positive electrode current collector.

7. The metal-air battery according to claim 6 , wherein
said conductive plate is bonded to a positive electrode current collector of another metal-air battery that has a structure similar to a structure of said metal-air battery.

8. A metal-air battery comprising:
a tubular positive electrode centered on a predetermined central axis;
a negative electrode opposing an inner side surface of said positive electrode; and
an electrolyte layer disposed between said negative electrode and said positive electrode,
wherein said positive electrode includes:
a tubular positive electrode conductive layer centered on said central axis;
a positive electrode catalyst layer formed on an outer side surface of said positive electrode conductive layer and having lower electrical conductivity than said positive electrode conductive layer; and
a positive electrode current collector formed on an area of said outer side surface of said positive electrode conductive layer where said positive electrode catalyst layer does not exist, to be in direct contact with said outer side surface, and
a thickness in a radial direction of said positive electrode current collector is greater than a thickness in the radial direction of said positive electrode catalyst layer,
wherein positive electrode conductive layer, said positive electrode catalyst layer, and said positive electrode current collector are each made of a perovskite type oxide, and
further comprising:
a conductive plate having a plate-like shape that extends at least in an axial direction along said central axis and having higher electrical conductivity than said positive electrode current collector,
wherein said positive electrode current collector extends in said axial direction on said outer side surface of said positive electrode conductive layer, and
said conductive plate is bonded to approximately a whole in said axial direction of said positive electrode current collector.

9. The metal-air battery according to claim 8 , wherein
said conductive plate is bonded to a positive electrode current collector of another metal-air battery that has a structure similar to a structure of said metal-air battery.

10. The metal-air battery according to claim 6 , wherein said positive electrode catalyst layer is a porous film.

11. The metal-air battery according to claim 7 , wherein said positive electrode catalyst layer is a porous film.

12. The metal-air battery according to claim 8 , wherein said positive electrode catalyst layers a porous film.

13. The metal-air battery according to claim 9 , wherein said positive electrode catalyst layers a porous film.

14. A metal-air battery according to claim 1 , wherein an axially-extending edge part of said positive electrode current collector is overlaid on an outer side surface of said positive electrode catalyst layer in a vicinity of an axially-extending edge of said positive electrode catalyst layer along said gap.

15. A metal-air battery according to claim 6 , wherein an axially-extending edge part of said positive electrode current collector is overlaid on an outer side surface of said positive electrode catalyst layer in a vicinity of an axially-extending edge of said positive electrode catalyst layeralong said gap.

16. A metal-air battery according to claim 8 , wherein an axially-extending edge part of said positive electrode current collector is overlaid on an outer side surface of said positive electrode catalyst layer in a vicinity of an axially-extending

Assignees

• Hitachi Shipbuilding Eng Co

Inventors

• Nishiura Sousuke
• Aizawa Masanobu
• Shimizu Takehiro
• Kameyama Kazuya

Classifications

• H01M12/065

  with plate-like electrodes or stacks of plate-like electrodes · CPC title

• H01M4/381

  Alkaline or alkaline earth metals elements (H01M4/40 takes precedence) · CPC title

• H01M12/06 Primary

  with one metallic and one gaseous electrode · CPC title

• H01M4/90

  Selection of catalytic material · CPC title

• H01M4/9016

  Oxides, hydroxides or oxygenated metallic salts · CPC title