# US 2022/0037682 A1 · Method of preparation and application for glass ceramic sealing thin strips

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- Number: US 2022/0037682 A1
- Document ID: US20220037682A1
- Status: Published application
- Kind: A1
- Application number: 16/984,097
- Filed: 2020-08-03
- Published: 2022-02-03
- Earliest claimed: 2020-08-03
- Assignees: Institute of Nuclear Energy Research Atomic Energy Council, Executive Yuan
- Inventors: TAI-NAN LIN; SZU-HAN WU; YI-JING WU; MIN-FANG HAN; WEI-XIN KAO; HONG-YI KUO; CHUN-YEN YEH; YUNG-NENG CHENG; RUEY-YI LEE
- Web page: https://patentgrep.com/patent/US20220037682A1

## CPC

- H01M 8/0286: Processes for forming seals
- H01M 8/0276: Sealing means characterised by their form (H01M8/0273 takes precedence)
- H01M 8/0282: Inorganic material
- H01M 8/2432: Grouping of unit cells of planar configuration
- 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

A method of preparation and application for a glass ceramic sealing thin strip with high sealing performance, differing from using conventional glass ceramic packaging paste applied to the junction of the cell stack assembly and connecting plates. The glass ceramic sealing thin strip of present invention utilizes tape casting to produce a single layer or multi-layer stacking in accordance with the required thickness of the glass-ceramic sealing thin strip, and cutting the glass ceramic sealing thin strips from molds in accordance with the geometry of cell stacks with equal thickness of the glass ceramic sealing thin strip for SOFC cell stack assembly, aiming to overcome the setbacks of the conventional dispensing method with glass ceramic packaging paste that makes the thickness difficult to control, and to effectively improve sealing performance of the cell stack assembly and the power generation efficiency, and achieve commercial application with mass production.

## Claims

### Claim 1

A method for manufacturing a glass ceramic sealing thin strip, comprising the steps of:
selecting a glass ceramic powder having sealing properties,
adjusting the glass ceramic powder into a slurry and preparing a green tape substrate through tape casting molding process, wherein the slurry ingredient comprises essentially of sealing glass ceramic powder, organic solvent, dispersant, pore former and binding agent,
laminating a thin glass ceramic green tape of the glass ceramic sealing thin strip to form the glass ceramic sealing thin strip through a process of thermal lamination and water pressure equalization;
preparing a size of the glass ceramic sealing thin strip in conformance with the size of a SOFC cell;
cutting the glass ceramic sealing thin strip into a single sheet thin strip kit for sealing the SOFC cell stack through a molding process in conformance with the geometry of the SOFC cell stack assembly, wherein the sealing strips are punched into various shapes through the molding process, including frames with square hollow portion, rings with circular hollow portion, plates with a plurality of circular hollow portion, and parts cut into various shapes in conformance with cell plates configured in the SOFC cell stack assembly;
attaching the single sheet thin strip kit of the glass ceramic sealing thin strip between unit cell chips and components of the SOFC cell stack assembly, and soften the SOFC cell stack assembly at high temperature from 800° C. to 900° C. before pressing and sealing the SOFC cell stack assembly;
determining an electrical performance test of the open-circuit voltage of a single cell of the SOFC cell stack assembly sealed by the glass ceramic sealing thin strip thus manufactured.

### Claim 2 (depends on 1)

The method for manufacturing a glass ceramic sealing thin strip of claim 1, wherein the thickness of the single sheet thin strip kit of the glass ceramic sealing thin strip is between 80 and 200 μm.

### Claim 3 (depends on 1)

The method for manufacturing a glass ceramic sealing thin strip of claim 1, wherein the number of stacking thin glass ceramic green tape of the glass ceramic sealing thin strip is determined by the size of the single sheet green tape and the size of the cell stack assembly.

### Claim 4 (depends on 1)

The method for manufacturing a glass ceramic sealing thin strip of claim 1, wherein the overall thickness of the glass ceramic sealing thin strip is between 300 and 800 μm.

### Claim 5 (depends on 1)

The method for manufacturing a glass ceramic sealing thin strip of claim 1, wherein the size of overall glass ceramic sealing thin strip is first made into a size between 10×10 cm2 and 15×15 cm2 with a SOFC cell.

### Claim 6 (depends on 1)

The method for manufacturing a glass ceramic sealing thin strip of claim 1, wherein the glass ceramic thin strip kit is attached between the cell and the cell stack assembly, and the cell stack assembly is performed at 800° C. to 900° C. for 4 to 24 hours of softening treatment before pressing and sealing.

### Claim 7 (depends on 1)

The method for manufacturing a glass ceramic sealing thin strip of claim 1, wherein a glass ceramic sealing thin strip packaging parameter test is performed using two sets of anode-supported SOFC chip sample A and B, wherein the thickness of the sample A is 500 μm and high temperature sealing was performed at 880° C. for 8 hours, and the thickness of the thin strip of the sample B is 700 μm and high temperature sealing was performed at 850° C. for 24 hours.

### Claim 8 (depends on 7)

The method for manufacturing a glass ceramic sealing thin strip of claim 7, wherein the testing thickness of the anode-supported SOFC is 430 μm, the size is no less than 10×10 cm2, and the composition is NiO-YSZ, YSZ, YSZ-LSM, LSM.