Sealing gasket for medium-and-low temperature solid oxide fuel cell, and manufacturing method and application of sealing gasket

Abstract

The invention relates to a sealing gasket for a medium-and-low temperature solid oxide fuel cell, and a manufacturing method and application of the sealing gasket. The sealing gasket comprises sealing glass powder, a dispersant, a plasticizer, a bonding agent and a solvent, and is characterized in that: the sealing glass powder comprises 28 to 38 mol percent of SiO2, 5 to 15 mol percent of B2O3, 30 to 40 mol percent of BaO, 0 to 10 mol percent of Al2O3, 0 to 5 mol percent of ZrO2, 0 to 16 mol percent of CaO, 0 to 15 mol percent of ZnO, 0 to 0.5 mol percent of NiO, 0 to 0.5 mol percent of Cr2O3 and 0 to 0.5 mol percent of Co2O3. Under the working temperature of the medium-and-low temperature solid oxide fuel cell, the coefficient of thermal expansion of the sealing gasket provided by the invention is slightly changeable in long-term thermal treatment, and is stable in the multiple thermal circulation and long-term running of a galvanic pile.

Description

technical field [0001] The invention belongs to the field of fuel cells, and relates to a sealing gasket for fuel cells, in particular to a sealing gasket containing glass frit for sealing, suitable for medium and low temperature solid oxide fuel cells, and a preparation method and application thereof. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy into electrical energy. It has the characteristics of high energy conversion efficiency and low pollution emissions, and meets the development needs of green energy in the 21st century. Among them, the solid oxide fuel cell (SOFC, Solid Oxide Fuel Cell) uses ceramic materials as the electrolyte, has an all-solid structure, higher energy conversion efficiency, does not use noble metal catalysts, and has wide fuel adaptability (it can directly use carbon through internal reforming) Hydrogen fuel, such as coal gas, natural gas, gasoline, petroleum liquefied gas and other ...

AI Technical Summary

Problems solved by technology

[0008] These studies have revealed some deficiencies in the existing glass-based sealing materials: such as the long-term thermal stability of the material at the service temperature, that is, the thermal stability of the glass-based sealing material at the service temperature is often not considered, especially When used for sealing of medium and low temperature SOFC

Many studies have mentioned that with the increase of the holding time, the sealing material will continue to crystallize, and the type, quantity, and particle size of the crystal phase will change, resulting in a significant change in the thermal expansion coefficient of the material. Poor matching of components, greatly reducing thermal cycle performance and causing seal failure

[0009] In addition, the implementation methods of sealing materials mentioned in the prior art mostly use coating, brushing, spraying, etc. These methods are simple and convenient in the implementation of small sealing areas, such as the test of a single small battery, alone with electrolyte or The sealing of the connection plate, but when the sealing area is increased, especially when implemented in the battery stack, these methods are cumbersome to apply, quality control is difficult, and the thickness of the seal is not controllable, which will greatly affect the current collection of the battery stack , which brings serious problems to the success rate of stack assembly and power output

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