# US 10,483,550 B2 · High temperature solid oxide cell comprising diffusion barrier layer and method for manufacturing the same

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- Number: US 10,483,550 B2
- Document ID: US10483550B2
- Status: Granted
- Kind: B2
- Application number: 15/630,471
- Filed: 2017-06-22
- Published: 2018-06-14
- Granted: 2019-11-19
- Earliest claimed: 2016-12-13
- Assignees: Korea Institute of Science and Technology
- Applicants: Korea Institute of Science and Technology
- Inventors: Kyung Joong Yoon; Seung-Hwan Lee; Mansoo Park; Jongsup Hong; Hyoungchul Kim; Ji-Won Son; Jong Ho Lee; Byung Kook Kim; Hae-Weon Lee
- Web page: https://patentgrep.com/patent/US10483550B2

## CPC

- H01M 4/8807: {Gas diffusion layers}
- H01M 4/8889: {Cosintering or cofiring of a catalytic active layer with another type of layer}
- H01M 4/9033: {Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites}
- H01M 8/1213: characterised by the electrode/electrolyte combination or the supporting material
- H01M 8/1253: the electrolyte containing zirconium oxide
- H01M 2008/1293: {Fuel cells with solid oxide electrolytes}
- Y02E 60/50: Fuel cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Provided is a solid oxide cell including a fuel electrode layer, electrolyte layer and an air electrode layer, wherein a diffusion barrier layer is provided between the air electrode layer and the electrolyte layer, the diffusion barrier layer includes: a first diffusion barrier layer formed on the electrolyte layer and including a sintered ceria-based metal oxide containing no sintering aid; and a second diffusion barrier layer formed on the first diffusion barrier layer and including a sintered product of a ceria-based metal oxide mixed with a sintering aid, the first diffusion barrier layer includes a sintered product of nanopowder and macropowder of a ceria-based metal oxide, and the first diffusion barrier layer and the second diffusion barrier layer are sintered at the same time. The diffusion barrier layer is densified, shows high interfacial binding force and prevents formation of a secondary phase derived from chemical reaction with the electrolyte.

## Claims

### Claim 1

A method for manufacturing a solid oxide cell, comprising the steps of:
(a) preparing a fuel electrode support;
(b) coating an electrolyte layer on the fuel electrode support;
(c) sintering the fuel electrode support and the electrolyte layer at the same time;
(d) coating a paste containing nanopowder and macropowder of a ceria-based metal oxide on the electrolyte layer to form a first coating layer;
(e) coating a mixed paste containing a ceria-based metal oxide and a sintering aid on the first coating layer to form a second coating layer;
(f) sintering the first coating layer and the second coating layer at the same time to provide a bilayer type diffusion barrier layer having a densified structure comprising a first diffusion barrier layer and a second diffusion barrier layer formed on the first diffusion barrier layer; and
(g) forming an air electrode layer on the bilayer type diffusion barrier layer.

### Claim 2 (depends on 1)

The method for manufacturing a solid oxide cell according to claim 1, wherein the nanopowder is present in an amount of 5-50 wt % based on the total weight of the first coating layer.

### Claim 3 (depends on 1)

The method for manufacturing a solid oxide cell according to claim 1, wherein the nanopowder has an average particle diameter of 10-100 nm.

### Claim 4 (depends on 1)

The method for manufacturing a solid oxide cell according to claim 1, wherein the macropowder has an average particle diameter of 100 nm-1 μm.

### Claim 5 (depends on 1)

The method for manufacturing a solid oxide cell according to claim 1, which further comprises a step of forming a fuel electrode functional layer on the fuel electrode support, after step (a).

### Claim 6 (depends on 1)

The method for manufacturing a solid oxide cell according to claim 1, wherein the ceria-based metal oxide contained in the second coating layer of step (e) is a mixture of nanopowder with macropowder.

### Claim 7 (depends on 6)

The method for manufacturing a solid oxide cell according to claim 6, wherein the nanopowder is used in an amount of 5-50 wt % based on the total weight of the second coating layer.

### Claim 8 (depends on 1)

The method for manufacturing a solid oxide cell according to claim 1, wherein the sintering aid is present in an amount of 0.05-5 wt % based on the total weight of the second coating layer.

### Claim 9 (depends on 1)

The method for manufacturing a solid oxide cell according to claim 1, wherein the sintering of step (f) is carried out at a temperature of 1000-1250° C.

### Claim 10 (depends on 1)

The method for manufacturing a solid oxide cell according to claim 1, wherein step (g) is carried out by forming an air electrode functional layer on the second diffusion barrier layer and then forming an air electrode current collector layer on the air electrode functional layer.