Electrolyte for solid oxide fuel cell, solid oxide fuel cell comprising same, composition for said electrolyte, and method for producing said electrolyte

Patent metadata

Field	Value
Publication number	US-10957932-B2
Application number	US-201716099622-A
Country	US
Kind code	B2
Filing date	Aug 24, 2017
Priority date	Sep 30, 2016
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

The present specification relates to an electrolyte of a solid oxide fuel cell, a solid oxide fuel cell including the same, a composition for the electrolyte, and a method for preparing the electrolyte.

First claim

The invention claimed is:

1. An electrolyte of a solid oxide fuel cell, said electrolyte comprising:
a first surface;
a second surface opposite the first surface; and
a middle portion present between the first and second surface,
wherein porosity gradually increases in a thickness direction from the middle portion to both the first surface and the second surface;
wherein the electrolyte further comprises oxygen ion conductive inorganic particles;
wherein the electrolyte further comprises a sintering agent in an amount of 0.2 wt % or more and less than 5 wt % based on the total weight of the electrolyte composition;
wherein the sintering agent includes a ZnO—B 2 O 3 —SiO 2 -based glass powder including SiO 2 , B 2 O 3 , BaO, ZnO, CaO, Fe 2 O 3 , K 2 O, Al 2 O 3 , ZrO 2 , and Na 2 O;
wherein in the glass powder, the sum of the weights of ZnO, B 2 O 3 and SiO 2 is 60 wt % or more and 80 wt % or less based on the total weight of the glass powder; and
wherein based on the total weight of the glass powder, the content of the ZnO is 5 wt % or more and 50 wt % or less, the content of the B 2 O 3 is 5 wt % or more and 30 wt % or less, and the content of the SiO 2 is 30 wt % or more and 50 wt % or less.

2. The electrolyte of claim 1 , wherein the porosity of each of the first surface and the second surface of the electrolyte is higher than the porosity of the middle portion of the electrolyte by 20% or more.

3. The electrolyte of claim 1 , wherein the porosity of the middle portion of the electrolyte is less than 0.1%.

4. The electrolyte of claim 1 , wherein the porosity of both the first surface and the second surface of the electrolyte is 20% or more, respectively.

5. The electrolyte of claim 1 , wherein an average thickness of the electrolyte is 300 μm or more and 1000 μm or less.

6. A solid oxide fuel cell, comprising:
an anode;
a cathode; and
the electrolyte of claim 1 provided between the anode and the cathode.

7. The solid oxide fuel cell of claim 6 , wherein the electrolyte is an electrolyte support.

8. The electrolyte of claim 1 , said electrolyte comprising an electrolyte composition comprising:
the oxygen ion conductive inorganic particles; and
the sintering agent,
wherein based on the total weight of the composition, the content of the sintering agent is 0.2 wt % or more and less than 5 wt %.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Jong Woo
• Baek Doohyun
• Ryoo Changseok
• Son Bu Won
• Choi Kwangwook

Classifications

• H01M2300/0077

  based on zirconium oxide · CPC title

• C04B2235/3217

  Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina · CPC title

• H01M8/1246 Primary

  the electrolyte consisting of oxides · CPC title

• C04B35/26

  based on ferrites · CPC title

• C04B2235/3284

  Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof · CPC title