Electrode and metal-air secondary battery

Patent metadata

Field	Value
Publication number	US-2018190993-A1
Application number	US-201615739356-A
Country	US
Kind code	A1
Filing date	Jun 20, 2016
Priority date	Jul 1, 2015
Publication date	Jul 5, 2018
Grant date	—

Abstract

A positive electrode of a metal-air secondary battery includes a conductive layer having electrical conductivity, and a catalyst layer laminated on the conductive layer. Particles of different types of perovskite oxides, namely a first perovskite-type oxide and a second perovskite-type oxide, are dispersed in the catalyst layer. The first perovskite-type oxide has an average particle diameter greater than or equal to 2 micrometers and less than or equal to 9 micrometers, and the second perovskite-type oxide has an average particle diameter greater than or equal to 0.10 micrometers and less than or equal to 1.0 micrometers. This composition improves battery performance while maintaining a certain level of strength of the catalyst layer.

First claim

1 . An electrode for use in a metal-air secondary battery, comprising:
a conductive layer having electrical conductivity; and a catalyst layer laminated on said conductive layer, wherein particles of a first perovskite-type oxide and particles of a second perovskite-type oxide are dispersed in said catalyst layer, said first perovskite-type oxide and said second perovskite-type oxide being of different types, said first perovskite-type oxide has an average particle diameter greater than or equal to 2 micrometers and less than or equal to 9 micrometers, and said second perovskite-type oxide has an average particle diameter greater than or equal to 0.10 micrometers and less than or equal to 1.0 micrometers.

2 . The electrode according to claim 1 , wherein
a volume of said first perovskite-type oxide contained in said catalyst layer is 0.25 times or more and 4 times or less a volume of said second perovskite-type oxide.

3 . The electrode according to claim 2 , wherein
the volume of said first perovskite-type oxide contained in said catalyst layer is approximately equal to the volume of said second perovskite-type oxide, said first perovskite-type oxide has an average particle diameter less than or equal to 4 micrometers, and said second perovskite-type oxide has an average particle diameter less than or equal to 0.5 micrometers.

4 . The electrode according to claim 1 , wherein
one of said first perovskite-type oxide and said second perovskite-type oxide is LaSrMnFeO 3 , and the other of said first perovskite-type oxide and said second perovskite-type oxide is LaSrCoFeO 3 .

5 . A metal-air secondary battery comprising:
a positive electrode that is the electrode according claim 1 ; a negative electrode; and an electrolyte layer disposed between said negative electrode and said positive electrode.

6 . The metal-air secondary battery according to claim 5 , wherein
said positive electrode and said electrolyte layer each are disposed in a tubular shape about said negative electrode.

7 . The electrode according to claim 2 , wherein
one of said first perovskite-type oxide and said second perovskite-type oxide is LaSrMnFeO 3 , and the other of said first perovskite-type oxide and said second perovskite-type oxide is LaSrCoFeO 3 .

8 . The electrode according to claim 3 , wherein
one of said first perovskite-type oxide and said second perovskite-type oxide is LaSrMnFeO 3 , and the other of said first perovskite-type oxide and said second perovskite-type oxide is LaSrCoFeO 3 .

9 . A metal-air secondary battery comprising:
a positive electrode that is the electrode according to claim 2 ; a negative electrode; and an electrolyte layer disposed between said negative electrode and said positive electrode.

10 . The metal-air secondary battery according to claim 9 , wherein
said positive electrode and said electrolyte layer each are disposed in a tubular shape about said negative electrode.

11 . A metal-air secondary battery comprising:
a positive electrode that is the electrode according to claim 3 ; a negative electrode; and an electrolyte layer disposed between said negative electrode and said positive electrode.

12 . The metal-air secondary battery according to claim 11 , wherein
said positive electrode and said electrolyte layer each are disposed in a tubular shape about said negative electrode.

13 . A metal-air secondary battery comprising:
a positive electrode that is the electrode according to claim 4 ; a negative electrode; and an electrolyte layer disposed between said negative electrode and said positive electrode.

14 . The metal-air secondary battery according to claim 13 , wherein
said positive electrode and said electrolyte layer each are disposed in a tubular shape about said negative electrode.

Assignees

• Hitachi Shipbuilding Eng Co

Inventors

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

Classifications

• H01M2004/8689

  Positive electrodes · CPC title

• H01M12/08

  composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type · CPC title

• H01M4/8626

  characterised by the form · CPC title

• H01M4/8652 Primary

  as mixture · CPC title

• H01M4/8889

  Cosintering or cofiring of a catalytic active layer with another type of layer · CPC title