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Coatings for preparing barrier layers, preparation methods of barrier layers and barrier layers

A barrier layer and coating technology, which is applied in the field of barrier layer, coating, and barrier layer preparation, can solve the problems affecting the long-term stability of the battery, and the sintering temperature cannot prevent the electrolyte and barrier layer, etc., so as to reduce the thickness, promote sintering, and reduce sintering The effect of temperature

Active Publication Date: 2022-01-14
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the still higher sintering temperature cannot prevent the reaction between the electrolyte and the barrier layer and form a highly insulating solid solution phase, affecting the long-term stability of the battery.

Method used

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  • Coatings for preparing barrier layers, preparation methods of barrier layers and barrier layers
  • Coatings for preparing barrier layers, preparation methods of barrier layers and barrier layers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. Preparation method of coating

[0045]This embodiment provides a coating for preparing a barrier layer, including nitrate, a combustion enhancer, and an aqueous solution. In this embodiment, as an optional solution, in order to reduce impurities in the coating, the aqueous solution uses distilled water. Wherein, the nitrates include gadolinium nitrate and cerium nitrate, and the molar ratio of gadolinium nitrate and cerium nitrate is 1:9; the combustion enhancer of this embodiment is citric acid, and as an alternative, the coating also includes GDC nanopowder, ethanol and dispersed agent, among which the dispersant is PVP. The preparation steps are as follows:

[0046] (1) ethanol is mixed with distilled water, wherein ethanol accounts for 10wt% of distilled water;

[0047] (2) Take a certain amount of gadolinium nitrate and cerium nitrate respectively according to the molar ratio of 1:9, dissolve them in the mixed solution of ethanol and distilled water, wherein g...

Embodiment 2

[0058] 1. Preparation method of coating:

[0059] This embodiment provides a coating for preparing a barrier layer, including nitrate, a combustion enhancer, and an aqueous solution. In this embodiment, as an optional solution, in order to reduce impurities in the coating, the aqueous solution uses distilled water. Wherein, the nitrates include gadolinium nitrate and cerium nitrate, and the molar ratio of gadolinium nitrate and cerium nitrate is 1:9; the combustion enhancer of this embodiment is citric acid, and as an alternative, the coating also includes GDC nanopowder, ethanol and dispersed agent, among which the dispersant is PVP. The preparation steps are as follows:

[0060] (1) ethanol is mixed with distilled water, wherein ethanol accounts for 20wt% of distilled water;

[0061] (2) Take a certain amount of gadolinium nitrate and cerium nitrate respectively according to the molar ratio of 1:9, dissolve them in the mixed solution of ethanol and distilled water, wherein...

Embodiment 3

[0071] 1. Preparation method of coating:

[0072] This embodiment provides a coating for preparing a barrier layer, including nitrate, a combustion enhancer, and an aqueous solution. In this embodiment, as an optional solution, in order to reduce impurities in the coating, the aqueous solution uses distilled water. Wherein, the nitrates include gadolinium nitrate and cerium nitrate, and the molar ratio of gadolinium nitrate and cerium nitrate is 1:9; the combustion enhancer of this embodiment is citric acid, and as an alternative, the coating also includes GDC nanopowder, ethanol and dispersed agent, among which the dispersant is PVP. The preparation steps are as follows:

[0073] (1) ethanol is mixed with distilled water, wherein ethanol accounts for 30wt% of distilled water;

[0074] (2) Take a certain amount of gadolinium nitrate and cerium nitrate respectively according to the molar ratio of 1:9, dissolve them in the mixed solution of ethanol and distilled water, wherein...

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Abstract

The invention discloses coatings for preparing barrier layers, preparation methods of the barrier layers and the barrier layers. The coatings for preparing the barrier layers comprise nitrate, a combustion improver and an aqueous solution, the nitrate comprises gadolinium nitrate and cerous nitrate, and the molar ratio of the gadolinium nitrate to the cerous nitrate is 1:9; and the molar weight of the combustion improver is 1.5-2 times that of metal ions. The preparation method of any one of the barrier layers comprises the following steps: coating any one of the coatings on an electrolyte sheet for presintering, decomposing nitrate to obtain GDC powder, and obtaining a barrier layer preform; coating the barrier layer preform with a sintering aid; and sintering the barrier layer preform to obtain the barrier layer. The invention also discloses the barrier layers, and the barrier layers are prepared by any one of the preparation methods of the barrier layer.

Description

technical field [0001] The invention belongs to the technical field of manufacturing solid oxide fuel cells, and in particular relates to a coating for preparing a barrier layer, a preparation method of the barrier layer and the barrier layer. Background technique [0002] As the world develops towards a low-carbon economy, solid oxide fuel cells (SOFCs) have attracted widespread attention as a clean energy power generation system. Among various oxygen-ion-conducting materials, yttrium-stabilized zirconia (YSZ) electrolytes show good stability and high open-circuit voltage, but the LSCF cathode of the battery reacts with the YSZ electrolyte during the sintering process, forming an insulating layer and Increase the ohmic resistance of the battery. To prevent the reaction between the LSCF cathode and the YSZ electrolyte, an additional GDC barrier layer was introduced. However, the GDC barrier layer is CeO 2 based electrolyte, CeO 2 The base electrolyte will form a highly i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89H01M8/1253
CPCC04B41/52C04B41/89C04B41/009H01M8/1253H01M2008/1293C04B35/48C04B41/5045C04B41/4535C04B41/0072C04B41/5031Y02E60/50
Inventor 赵世凯张晓娇王重海徐传伟马腾飞李杰陈大明李洪达丛晓彤
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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