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Solid oxide fuel cell composite sealant and application thereof

A solid oxide and composite sealing technology, which is applied to fuel cell parts, sealing/supporting devices, etc., can solve problems such as difficult to achieve pressurized sealing, and achieve the effect of good sealing and high bonding strength

Active Publication Date: 2019-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In tubular cells, it is difficult to achieve such pressurized sealing, which limits the application of glass sealing materials in tubular SOFC stacks

Method used

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  • Solid oxide fuel cell composite sealant and application thereof
  • Solid oxide fuel cell composite sealant and application thereof
  • Solid oxide fuel cell composite sealant and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Composite sealants for tubular solid oxide fuel cells, including solid glass components (such as figure 1 shown in A1 and A2) and liquid glass components (such as figure 1 shown in B).

[0023] In this embodiment, the solid glass component A1 is SrO-Al 2 o 3 -SiO 2 glass powder. A2 is SrO-K 2 O-Al 2 o 3 -SiO 2 glass powder. The glass is prepared by the traditional melting method. The oxide raw materials mixed in proportion are melted at 1300-1500°C and then quenched to obtain glass frit, which is dried and crushed to obtain glass powder. Liquid glass component B is an aqueous glass solution containing Sr and K, which is obtained by hydrolyzing silicate glass in an alkaline solution containing Sr and K under heating and pressure.

[0024] In this embodiment, the weight ratio of the solid glass component is 80%, and the weight ratio of the liquid glass component is 20%. The solid glass component and the liquid glass component are mixed and evenly coated on the...

Embodiment 2

[0027] The difference from Example 1 is that the solid glass component of the composite sealant is BaO-Al 2 o 3 -SiO 2 Glass powder, the liquid glass component is an aqueous solution of silicate glass containing Na and Ba. In this embodiment, the weight ratio of the solid glass component is 50%, and the weight ratio of the liquid glass component is 50%. After the solid glass component and the liquid glass component are mixed, they are uniformly distributed on the parts to be sealed, and after being fully dried, heat treatment is carried out at 600°C.

Embodiment 3

[0029] The difference from Example 2 is that the solid glass component of the composite sealant is BaO-Al 2 o 3 -SiO 2 A mixture of glass powder and fibers. The mixture of the glass powder and fiber is dispersed in the organic solution of PVB, and coated between the solid oxide fuel cell unit 1 and the metal terminal 2 that need to be sealed (such as image 3 shown), dry and pre-fire at 800°C to obtain a porous glass skeleton, then fill the pores of the glass skeleton with liquid glass components to form a glass sealing layer 3, and use it after drying.

[0030] Figure 4 It is the performance of the tubular battery sealed by the composite sealant of the present invention. Compared with batteries sealed with traditional silicate adhesive (high temperature glue), due to the improved sealing performance, the open circuit potential and power density of the battery are significantly improved.

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Abstract

The invention discloses a solid oxide fuel cell composite sealant comprising a solid glass component and a liquid glass component, wherein the weight ratio of the solid glass component is 50% to 80%,and the weight ratio of the liquid glass component is 20% to 50%. According to the solid glass component, with SiO2 as an organizer, one or more alkali metal elements and alkaline earth metal elementsare taken as modifiers. The liquid glass component is an aqueous solution of glass, SiO2 is an organizer of the glass for preparing the liquid glass component, and one or more alkali metal elements and alkaline earth metal elements are contained. The solid oxide fuel cell composite sealant is applied to the position between a fuel cell unit and other components of a battery pile and has the advantages of good sealing and high bonding strength. A sealing layer with high density and strength can be formed after the composite sealant is dried without pressure sintering, and the solid oxide fuelcell composite sealant is particularly suitable for the sealing of a tubular solid oxide fuel cell.

Description

technical field [0001] The invention relates to a solid oxide fuel cell, in particular to a composite sealant for a solid oxide fuel cell and its application. Background technique [0002] Solid oxide fuel cell (SOFC) is a power generation device that directly converts chemical energy in fuel into electrical energy in a clean and efficient manner. It has the advantages of wide adaptability to various fuel gases and high value of waste heat utilization. SOFC can provide a module close to the end user to solve the problems of high energy consumption and noise in the process of power transmission. It can be applied in the fields of mobile power supply, distributed power generation system, embedded power generation device and symbiotic power generation, especially for important government and the military sector. [0003] At present, SOFC is mainly divided into two types: plate type and tube type. Among them, the plate-type SOFC battery stack is formed by stacking plate-type b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0284H01M8/0286
CPCY02E60/50
Inventor 区定容程谟杰王秀玲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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