Electrochemical cell

Patent metadata

Field	Value
Publication number	US-11380902-B2
Application number	US-201816210432-A
Country	US
Kind code	B2
Filing date	Dec 5, 2018
Priority date	Jul 27, 2016
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

The electrochemical cell has an anode, a cathode, and a solid electrolyte layer. The cathode contains a perovskite oxide expressed by the general formula ABO3 and includes at least one of Sr and La at the A site as a main component. The solid electrolyte layer is disposed between the anode and the cathode. The cathode includes a solid electrolyte layer-side region within 3 μm from a surface of the solid electrolyte layer side. The solid electrolyte layer-side region includes a main phase which is configured by the perovskite oxide and a second phase which is configured by Co3O4 and (Co, Fe)3O4. An occupied surface area ratio of the second phase in a cross section of the solid electrolyte layer-side region is less than or equal to 10.5%.

First claim

The invention claimed is:

1. An electrochemical cell comprising:
an anode,
a cathode containing a perovskite oxide expressed by the general formula ABO 3 and including at least one of Sr and La at the A site as a main component, and
a solid electrolyte layer disposed between the anode and the cathode,
the cathode including a solid electrolyte layer-side region within 3 μm from a surface of the solid electrolyte layer side, the solid electrolyte layer-side region including a main phase which is configured by the perovskite oxide and a second phase which is configured by Co 3 O 4 and (Co, Fe) 3 O 4 ,
an occupied surface area ratio of the second phase in a cross section of the solid electrolyte layer-side region being less than or equal to 10.5%, and
an occupied surface area ratio of (Co, Fe) 3 O 4 in a cross section of the solid electrolyte layer-side region is greater than an occupied surface area ratio of Co 3 O 4 .

2. The electrochemical cell according to claim 1 , wherein the occupied surface area ratio of the second phase in a cross section of the solid electrolyte layer-side region is greater than or equal to 0.5%.

3. The electrochemical cell according to claim 1 , wherein an average equivalent circle diameter of the second phase in a cross section of the solid electrolyte layer-side region is greater than or equal to 0.05 μm and less than or equal to 0.5 μm.

4. The electrochemical cell according to claim 1 , wherein the occupied surface area ratio of the second phase in a cross-section of the solid electrolyte layer-side region is from 0.5-9.7%.

5. The electrochemical cell according to claim 4 , wherein the occupied surface area ratio of the second phase in a cross-section of the solid electrolyte layer-side region is from 0.6-2.9%.

Assignees

• Ngk Insulators Ltd

Inventors

• Fujisaki Shinji
• Ryu Takashi
• Ohmori Makoto

Classifications

• C04B35/2608 Primary

  Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead · CPC title

• C04B2235/3227

  Lanthanum oxide or oxide-forming salts thereof · CPC title

• C04B2235/81

  Materials characterised by the absence of phases other than the main phase, i.e. single phase materials · CPC title

• C04B35/2641

  Compositions containing one or more ferrites of the group comprising rare earth metals and one or more ferrites of the group comprising alkali metals, alkaline earth metals or lead · CPC title

• C04B2235/3274

  Ferrites · CPC title