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Sealing material of medium temperature plate type solid-oxide fuel battery stack and sealing method

A technology of solid oxide and fuel cell stacks, which is applied to battery components, circuits, electrical components, etc., and can solve problems such as insufficient thermal and chemical stability, insufficient chemical stability, and easy oxidation and corrosion , to achieve good chemical compatibility, good insulation, and increase the effect of mechanical properties

Active Publication Date: 2012-10-10
武汉华科福赛新能源有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Their respective advantages and disadvantages are: metal-based sealing materials can withstand certain plastic deformation, but are easily oxidized and corroded, and are not insulated, so the long-term stability is not good; mica-based sealing materials do not require very precise thermal matching, but when working A high load is required, the thermal cycle performance is not good, and potassium elements will cause poisoned electrodes; for glass and glass-ceramic based sealing materials, it is easy to scale equipment, simple sealing, and low cost, but the disadvantage is that The thermal stability is not good, it is easy to crystallize, and the chemical stability is not good enough, the brittleness is large, and the service life is low
However, as pointed out above, current glass and glass-ceramic based sealing materials are insufficient in terms of thermal stability and chemical stability, so further improvements in their composition and properties are necessary

Method used

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  • Sealing material of medium temperature plate type solid-oxide fuel battery stack and sealing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1, the preparation of composite sealing material:

[0043] 80g of glass powder containing the above components and 120g of Al 2 o 3 Add 120ml of mixed solution of fish oil, xylene and ethanol to the powder, and ball mill for 24 hours to fully disperse the powder into a suspension; then add 8g of butyl benzyl ester, 8g of 1,2-propanediol (PAG), and 14g of polyvinyl butyral in sequence Resin (PVB) and 0.1g cyclohexanone were ball milled for 24 hours to form a slurry with a certain viscosity. After using a vacuum device to remove air bubbles in the slurry, the slurry is tape-casted and dried, thereby preparing a composite sealing material substrate.

Embodiment 2

[0044] Embodiment 2, the preparation of composite sealing material:

[0045] 120g of glass powder containing the above components and 80g of Al 2 o 3 Add 120ml of mixed solution of fish oil, xylene and ethanol to the powder, and ball mill for 24 hours to fully disperse the powder into a suspension; then add 8g of butyl benzyl ester, 8g of 1,2-propanediol (PAG), and 14g of polyvinyl butyral in sequence Resin (PVB) and 0.1g cyclohexanone were ball milled for 24 hours to form a slurry with a certain viscosity. After using a vacuum device to remove air bubbles in the slurry, the slurry is cast and dried, thereby preparing a composite sealing material cast sheet.

Embodiment 3

[0046] Embodiment 3, the preparation of composite sealing material:

[0047] 100g of glass powder containing the above components and 100g of Al 2 o 3 Add 120ml of mixed solution of fish oil, xylene and ethanol to the powder, and ball mill for 24 hours to fully disperse the powder into a suspension; then add 8g of butyl benzyl ester, 8g of 1,2-propanediol (PAG), and 14g of polyvinyl butyral in sequence Resin (PVB) and 0.1g cyclohexanone were ball milled for 24 hours to form a slurry with a certain viscosity. After using a vacuum device to remove air bubbles in the slurry, the slurry is cast and dried, thereby preparing a composite sealing material cast sheet.

[0048] In addition to preparing composite sealing materials, Al 2 o 3 Make casting sheet separately from glass powder, or make Al separately 2 o 3 Cast sheet and glass paste are used together.

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Abstract

The invention discloses a sealing material of a medium temperature plate type solid-oxide fuel battery stack, which comprises the following components: Al2O3 powder, glass powder and an organic additive which is taken as a binder and a plasticizer, wherein the glass powder is composed of BaO with mass percentage of 20%-25%, B2O3 with mass percentage of 10%-15%, MgO with mass percentage of 20%-25%, ZnO with mass percentage of 10-15% and SiO2 with mass percentage of 30%-35%, its particle size is about 5-10mum; and the particle size of the Al2O3 powder is about 1-10mum. The invention also discloses a method for using the sealing material to seal the medium temperature plate type solid-oxide fuel battery stack. According to the invention, the tight accumulation of the sealing particles can be realized, the leakage rate of the sealing materials can be reduced, the mechanical properties of the materials can be increased, and the gas sealing can be effectively realized by the sealing mode which is convenient for operating and processing.

Description

technical field [0001] The invention belongs to the field of fuel cells, and more specifically relates to a sealing material used in a medium-temperature flat-plate solid oxide fuel cell stack and a corresponding sealing method. Background technique [0002] Solid Oxide Fuel Cell (Solid Oxide Fuel Cell, SOFC) is a power generation device that converts chemical energy in fossil fuels (coal, oil, natural gas and its hydrocarbons, etc.) by electrochemical process. Compared with the traditional power generation method based on combustion, SOFC technology greatly reduces the energy loss of fossil fuels in energy conversion and the damage to the environment, and is an efficient and pollution-free power generation device. At present, the structures of SOFC stacks mainly include tube type and flat plate type. [0003] Flat-plate solid oxide fuel cell stacks can provide higher energy density and better performance than tubular ones, but require good sealing materials. Sealing mate...

Claims

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Application Information

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IPC IPC(8): H01M2/08C03C12/00
CPCY02E60/12Y02E60/10
Inventor 李箭颜冬王晓鹏蒲键池波方大为罗军
Owner 武汉华科福赛新能源有限责任公司
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