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Cathode material of solid oxide fuel cell and preparation method thereof

A fuel cell cathode, solid oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor chemical stability and material structure stability, troubles in battery power output performance, and rapid decline in catalytic activation ability. , to achieve good thermal and chemical compatibility, improved stability, and good catalytic activity.

Inactive Publication Date: 2012-02-01
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

As we all know, LSM and doped zirconia electrolyte tend to react during the preparation and roasting process to form zirconate, a high-resistance phase material, which causes the polarization resistance of the battery to increase sharply and the battery performance to drop sharply; in addition, at 800 ° C Below, the catalytic activation ability of LSM to oxygen molecules drops rapidly, which brings great trouble to the power output performance of the battery.
Other perovskite-type composite doped oxides are good mixed conductive materials of oxygen ions and electrons, but their thermal expansion coefficients are quite different from those of electrolyte materials, and their chemical stability and material structure stability are not good. It is easy to chemically react with the electrolyte to form a high-resistance phase substance

Method used

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  • Cathode material of solid oxide fuel cell and preparation method thereof
  • Cathode material of solid oxide fuel cell and preparation method thereof
  • Cathode material of solid oxide fuel cell and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Mn was prepared as above 2 CoO 4 powder, then take 1.0 g of Mn 2 CoO 4 For the powder, add 0.05 gram of terpineol, 0.05 gram of polyethylene glycol, and 0.02 gram of dibutyl phthalate to make ink. Coating of Mn on the other side of the electrolyte of the anode support complex by Doctor Blade scraping method 2 CoO 4 layer, treated at 900-1100°C for 3h, and the cathode is Mn 2 CoO 4 single battery. In the prepared battery, the electrolyte layer is well bonded to the cathode layer, and there is no peeling or falling off of the two layers. figure 2 Mn for the cathode 2 CoO 4 Cross-sectional SEM images of different functional components of a single cell before electrochemical testing.

Embodiment 2

[0027] MnCo was prepared as above 2 o 4 powder, then take 1.0 g of MnCo 2 o 4 For the powder, add 0.05 gram of terpineol, 0.05 gram of polyethylene glycol, and 0.02 gram of dibutyl phthalate to make ink. Coating MnCo on the other side of the electrolyte of the anode support complex using Doctor Blade scrape film method 2 o 4 layer, treated at 900-1100°C for 3 hours, and the cathode is MnCo 2 o 4 single battery. In the prepared battery, the electrolyte layer is well bonded to the cathode layer, and there is no peeling or falling off of the two layers. image 3 MnCo for the cathode 2 o 4 SEM image of the surface of the single cell before electrochemical testing.

Embodiment 3

[0029] Prepare Mn as above 1.5 co 1.5 o 4 Powder, then weigh 95 parts of Mn by mass ratio 1.5 co 1.5 o 4 , 5 parts of electrolyte same series powder Sm 0.2 Ce 0.8 o 1.9 , Add 4.75 parts of terpineol, 4.75 parts of polyethylene glycol, and 1.9 parts of dibutyl phthalate to make ink, which is called composite cathode slurry. Then use the Doctor Blade scraping method to scrape and coat the composite cathode slurry on the other side of the electrolyte of the anode support complex, and treat it at 950-1150°C for 3 hours to obtain the cathode as Mn 1.5 co 1.5 o 4 -Sm 0.2 Ce 0.8 o 1.9 single battery. In the prepared battery, the electrolyte layer is well bonded to the composite cathode layer, and there is no peeling or falling off of the two layers. Figure 4 Mn for the cathode 1.5 co 1.5 o 4 -Sm 0.2 Ce 0.8 o 1.9 SEM image of the cathode surface of the single cell before electrochemical testing.

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PUM

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Abstract

The invention relates to a cathode material of a solid oxide fuel cell, comprising spinel type oxide material powder and oxygen conductive material powder, wherein, the weight of the spinel type oxide material powder accounts for 10-100 % of the total weigh of the cathode material, and the oxygen conductive material powder is the rest. The preparation method of the cathode material comprises the following steps: first, preparing the spinel type oxide material powder and oxygen conductive material powder; then, mixing the spinel type oxide material powder and oxygen conductive material powder, grinding, and preparing into electrode paste; and finally, scratching the electrode paste onto the electrolyte layers, drying, roasting for 2-5 h at the temperature of 900-1150 DEG C to obtain the cathode material of the solid oxide fuel cell. The cathode material has high conductive capability in low temperature area, and has good catalytic activity to oxygen reduction reaction.

Description

technical field [0001] The invention relates to a cathode material of a solid oxide fuel cell, which is composed of a spinel oxide and electrolyte series materials, especially its design, preparation and application to a medium-low temperature solid oxide fuel cell. Background technique [0002] Traditional high-temperature solid oxide fuel cells have many problems due to their high operating temperature (usually at 800-1000 ° C), such as narrow selection of raw materials for cells, harsh preparation processes, high costs, and short service life. Reducing the operating temperature to medium and low temperature, all its advantages can still be retained. Not only the performance requirements for battery raw materials are greatly reduced, but also the selection range of battery raw materials can be expanded. In particular, oxidation-resistant stainless steel with good toughness and low price can be used as a two-way connector. Material, technology and cost advantages are obviou...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 杨维慎刘焕英朱雪峰丛铀
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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