Fuel cell and manufacturing method of the same

Patent metadata

Field	Value
Publication number	US-11431015-B2
Application number	US-202016790140-A
Country	US
Kind code	B2
Filing date	Feb 13, 2020
Priority date	Feb 25, 2019
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A fuel cell includes: a porous anode; and an electrolyte layer that is provided on the anode and includes solid oxide having oxygen ion conductivity, wherein the anode has a structure in which an anode catalyst is provided in a void, wherein, in a cross section of the anode and the electrolyte layer in a stacking direction thereof, an average void diameter of voids in the anode is 0.1 μm or more and 2 μm or less, wherein, in the cross section, a D10% diameter of void diameter distribution of the voids in the anode is 0.1 μm or mode and 2 μm or less, wherein a D90% diameter of the void diameter distribution is 1 μm or more and 7 μm or less.

First claim

What is claimed is:

1. A fuel cell comprising:
a porous anode; and
an electrolyte layer that is provided on the anode and includes solid oxide having oxygen ion conductivity,
wherein the anode has a structure in which an anode catalyst is provided in a void,
wherein, in a cross section of the anode and the electrolyte layer in a stacking direction thereof, an average void diameter of voids in the anode is 0.1 μm or more and 2 μm or less,
wherein, in the cross section, a D10% diameter of void diameter distribution of the voids in the anode is 0.1 μm or more and 2 μm or less,
wherein a D90% diameter of the void diameter distribution is 1.1 μm or more and 7 μm or less.

2. The fuel cell as claimed in claim 1 , wherein a porosity of the anode is 50% or more and 85% or less in an interface between the anode and the electrolyte layer.

3. The fuel cell as claimed in claim 1 , wherein a porosity of a whole of the anode is 40% or more and 80% or less.

4. The fuel cell as claimed in claim 1 , wherein the anode catalyst includes Ni, and one of BaCe 1-x Zr x O 3 (BCZY, x=0 to 1) in which Y is doped, SrCe 1-x Zr x O 3 (SCZY, x=0 to 1) in which Y is doped, LaScO 3 (LSS) in which Sr is doped, and Gd-doped ceria or a mixture thereof.

5. The fuel cell as claimed in claim 1 , wherein the void in the anode was formed by Fe—Cr ahoy and scandia-yttria-stabilized zirconium, or formed by only the Fe—Cr ahoy, or formed by only the scandia-yttria-stabilized zirconium.

6. The fuel cell as claimed in claim 1 , wherein a thickness of the anode is 5 μm or more and 50 μm or less.

7. A manufacturing method of a fuel cell comprising:
preparing a structure in which an electrolyte layer having oxygen ion conductivity is provided on a porous anode, wherein the anode has a structure in which an anode catalyst is provided in a void, wherein, in a cross section of the anode and the electrolyte layer in a stacking direction thereof, an average void diameter of voids in the anode is 0.1 μm or more and 2 μm or less, wherein, in the cross section, a D10% diameter of void diameter distribution of the voids in the anode is 0.1 μm or more and 2 μm or less, wherein a D90% diameter of the voids diameter distribution is 1.1 μm or more and 7 μm or less; and
impregnating the anode catalyst into the anode.

8. The fuel cell as claimed in claim 1 , wherein the average void diameter of voids in the anode is 0.6 μm or more and 2 μm or less.

9. The fuel cell as claimed in claim 1 , wherein the D90% diameter of the void diameter distribution is 1.2 μm or more and 7 μm or less.

Assignees

• Taiyo Yuden Kk

Inventors

• Kawamura Chie
• Li Xinyu

Classifications

• H01M8/12 Primary

  operating at high temperature, e.g. with stabilised ZrO2 electrolyte · CPC title

• H01M4/8636

  with a gradient in another property than porosity (H01M4/861 takes precedence) · CPC title

• H01M4/9066 Primary

  of metal-ceramic composites or mixtures, e.g. cermets · CPC title

• H01M4/861

  with a gradient in the porosity · CPC title

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title