Laminate structure of mixed ionic-electronic conductive electrolyte and electrode, and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2020203747-A1
Application number	US-201816614425-A
Country	US
Kind code	A1
Filing date	May 18, 2018
Priority date	May 18, 2017
Publication date	Jun 25, 2020
Grant date	—

Abstract

Provided is a thin-film laminate structure of mixed ionic-electronic conductive electrolyte and electrode which, when used as a solid oxide cell electrolyte, enables the ionic transference number to be increased even without using a costly noble metal. The laminate structure of mixed ionic-electronic conductive electrolyte and electrode comprises a dense electrolyte layer (1), a porous electrolyte layer (2), and a porous electrode (3). The dense electrolyte layer (1) has a film thickness of 1 to 15 μm and a relative density of 95 to 100 vol %, and contains a first oxide having mixed ionic-electronic conductivity. The porous electrolyte layer (2) is laminated on the dense electrolyte layer (1), has a film thickness of 1 to 10 μm and a relative density of 30 to 90 vol %, and contains a second oxide having mixed ionic-electronic conductivity. The porous electrode (3) is laminated on the porous electrolyte layer.

First claim

1 . A laminate structure of mixed ionic-electronic conductive electrolyte and electrode, comprising:
a dense electrolyte layer that has a film thickness of 1 to 15 μm and a relative density of 95 to 100 vol %, and which contains a first oxide having mixed ionic-electronic conductivity; a porous electrolyte layer which is laminated on the dense electrolyte layer, has a film thickness of 1 to 10 μm and a relative density of 30 to 90 vol %, and which contains a second oxide having mixed ionic-electronic conductivity; and a porous electrode which is laminated on the porous electrolyte layer.

2 . The laminate structure of mixed ionic-electronic conductive electrolyte and electrode as claimed in claim 1 , wherein the first oxide and/or the second oxide may be an oxide represented by A XB YO 3+Z (A= at least one element among Sr, Ba, and La, and B= at least one element among Zr, Ce, Sc, Y, In, and Yb, where 0.8≤X≤1.2, 0.8≤Y≤1.2, and −1≤Z≤1).

3 . The laminate structure of mixed ionic-electronic conductive electrolyte and electrode as claimed in claim 1 , wherein the first oxide and/or the second oxide may be an oxide represented by Ce xM yO 2−z (M= at least one element among Sc, Y, Zr, In, La, Pr, Sm, Gd, and Yb, where 0.6≤x≤1.0, 0≤y≤0.4, and 0≤z≤0.5).

4 . The laminate structure of mixed ionic-electronic conductive electrolyte and electrode as claimed in claim 1 ,
wherein the porous electrode contains an oxide represented by A XB YO 3+Z (A= at least one element among Sr, Ba, and La, and B= at least one element among Zr, Ce, Sc, Y, In, and Yb, where 0.8≤X≤1.2, 0.8≤Y≤1.2, and −1≤Z≤1), and/or an oxide represented by Ce xM yO 2−z (M= at least one element among Sc, Y, Zr, In, La, Pr, Sm, Gd, and Yb, where 0.6≤x≤1.0, 0≤y≤0.4, and 0≤z≤0.5), and wherein the content percentage of the oxides in the porous electrode is 30 to 70 mass %.

5 . A solid oxide cell having the laminate structure of mixed ionic-electronic conductive electrolyte and electrode as claimed in claim 1 .

6 . A method for manufacturing a laminate structure of mixed ionic-electronic conductive electrolyte and electrode as claimed in claim 1 , comprising:
a step of forming the dense electrolyte layer by coating a first slurry on a support body and then firing at a first temperature; a step of forming the porous electrolyte layer by coating a second slurry on the dense electrolyte layer and then firing at a second temperature; and a step of forming the porous electrode by coating a third slurry on the porous electrolyte layer and then firing at a third temperature.

7 . The method for manufacturing a laminate structure of mixed ionic-electronic conductive electrolyte and electrode as claimed in claim 6 ,
wherein the first temperature ≥ the second temperature ≥ the third temperature.

8 . The method for manufacturing the solid oxide cell as claimed in claim 5 , comprising:
a step of forming the dense electrolyte layer by coating a first slurry on a first electrode and then firing at a first temperature; a step of forming the porous electrolyte layer by coating a second slurry on the dense electrolyte layer and then firing at a second temperature; and a step of forming the porous electrode which is a second electrode by coating a third slurry on the porous electrolyte layer and then firing at a third temperature.

9 . The method for manufacturing the solid oxide cell as claimed in claim 8 , wherein the first temperature ≥ the second temperature ≥ the third temperature.

10 . A solid oxide cell having the laminate structure of mixed ionic-electronic conductive electrolyte and electrode as claimed in claim 2 .

11 . A solid oxide cell having the laminate structure of mixed ionic-electronic conductive electrolyte and electrode as claimed in claim 3 .

12 . A solid oxide cell having the laminate structure of mixed ionic-electronic conductive electrolyte and electrode as claimed in claim 4 .

13 . A method for manufacturing a laminate structure of mixed ionic-electronic conductive electrolyte and electrode as claimed in claim 2 , comprising:
a step of forming the dense electrolyte layer by coating a first slurry on a support body and then firing at a first temperature; a step of forming the porous electrolyte layer by coating a second slurry on the dense electrolyte layer and then firing at a second temperature; and a step of forming the porous electrode by coating a third slurry on the porous electrolyte layer and then firing at a third temperature.

14 . A method for manufacturing a laminate structure of mixed ionic-electronic conductive electrolyte and electrode as claimed in claim 3 , comprising:
a step of forming the dense electrolyte layer by coating a first slurry on a support body and then firing at a first temperature; a step of forming the porous electrolyte layer by coating a second slurry on the dense electrolyte layer and then firing at a second temperature; and a step of forming the porous electrode by coating a third slurry on the porous electrolyte layer and then firing at a third temperature.

15 . A method for manufacturing a laminate structure of mixed ionic-electronic conductive electrolyte and electrode as claimed in claim 4 , comprising:
a step of forming the dense electrolyte layer by coating a first slurry on a support body and then firing at a first temperature; a step of forming the porous electrolyte layer by coating a second slurry on the dense electrolyte layer and then firing at a second temperature; and a step of forming the porous electrode by coating a third slurry on the porous electrolyte layer and then firing at a third temperature.

Assignees

• Aist

Inventors

• Shimada Hiroyuki
• Yamaguchi Toshiaki

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/50

  Fuel cells · CPC title

• H01M2300/0094

  in the form of layered products, e.g. coatings · CPC title

• H01M2300/0074

  Ion conductive at high temperature · CPC title

• H01M8/126

  the electrolyte containing cerium oxide · CPC title