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Composite oxygen electrode for solid oxide battery and preparation method thereof

A solid oxide, oxygen electrode technology, applied in battery electrodes, fuel cells, circuits, etc., can solve the problems of oxygen electrode/electrolyte thermal expansion coefficient mismatch, thermal expansion coefficient mismatch, environmental pollution, etc., to solve the thermal expansion coefficient mismatch. , the effect of reducing the synthesis or calcination temperature and improving the mixed conductivity

Active Publication Date: 2020-10-23
上海氢程科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem actually solved by the present invention is to overcome the excessive use of organic matter in the preparation process of the oxygen electrode of the existing solid oxide battery, causing environmental pollution, and the use of high temperature treatment, which not only increases energy consumption, but also causes Oxygen electrode / electrolyte thermal expansion coefficient mismatch defect, providing a composite oxygen electrode for solid oxide battery and its preparation method
In addition, the invention also solves the problem of thermal expansion coefficient mismatch between the oxygen electrode and the electrolyte

Method used

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  • Composite oxygen electrode for solid oxide battery and preparation method thereof
  • Composite oxygen electrode for solid oxide battery and preparation method thereof
  • Composite oxygen electrode for solid oxide battery and preparation method thereof

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Embodiment 1

[0038] The composite oxygen electrode for the solid oxide battery in this embodiment is made of perovskite oxide LSCF and Na 0.5 K 0.5 Cl is mixed and baked on CGO electrolyte, which has a porous structure. Its specific preparation method is as follows:

[0039] (1) The material required for perovskite oxide is La 2 o 3 , SrCO 3 、Co 3 o 4 , Fe 3 o 4 , the stoichiometric ratio of the above-mentioned materials is 3:6:2:2, the total mass of the above-mentioned materials is 20g; take the inorganic salts NaCl and KCl (the molar ratio of the two is 1:1), the quality of the inorganic salts and calcium The mass ratio of materials required for titanium ore oxide is 1:1;

[0040] Mix all the above raw materials evenly in a mortar, add an appropriate amount of alcohol and grind for 2 hours, dry the alcohol and then grind for 1 hour to obtain a powder;

[0041] (2) Dissolve 5g of ethyl cellulose in 95g of terpineol as an organic binder, and add the organic binder into the mortar...

Embodiment 2

[0044] The preparation method of the composite oxygen electrode of this embodiment is except the following differences, and other operations and conditions are all consistent with embodiment 1:

[0045] The mass ratio of the material mass of the perovskite oxide LSCF to the inorganic salts (NaCl and KCl) in step (1) is 1:5, and the calcination temperature of the oxygen electrode in step (3) is 600°C.

Embodiment 3

[0047] The preparation method of the composite oxygen electrode of this embodiment is except the following differences, and other operations and conditions are all consistent with embodiment 1:

[0048] The mass ratio of the mass of perovskite oxide LSCF to the mass of inorganic salts (NaCl and KCl) in step (1) is 5:1, and the calcination temperature of the oxygen electrode in step (3) is 1000°C.

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Abstract

The invention provides a composite oxygen electrode for a solid oxide battery and a preparation method of the composite oxygen electrode. The method comprises the following steps: (1) grinding materials required by perovskite oxides and inorganic salt according to a mass ratio of (1 to 5)-(5 to 1) and mixing uniformly to obtain powder; (2) grinding the powder and an organic binding agent and mixing uniformly to obtain electrode slurry; and (3) coating the electrolyte layer of the solid oxide battery with the electrode slurry, and roasting to obtain the composite oxygen electrode. The compositeoxygen electrode is in situ synthesized on the electrolyte of the solid oxide battery, the process is simple, the applicability is strong, organic matter does not require to be used in the syntheticprocess, the synthesis or calcination temperature of an electrode material is lowered, and the oxygen ion conduction characteristics of the electrode are enhanced; the obtained composite oxygen electrode has a porous structure and can effectively provide a gaseous diffusion channel, an electronic transmission channel and an oxygen ion transmission channel, and the mixed electrical conductivity ofthe composite oxygen electrode is greatly improved. The invention further solves the problem that the thermal expansion coefficient of the oxygen electrode is not matched with the thermal expansion coefficient of the electrolyte.

Description

technical field [0001] The invention relates to a composite oxygen electrode for a solid oxide battery and a preparation method thereof. Background technique [0002] A reversible solid oxide cell (SOEC) can be used as a solid oxide fuel cell (SOFC) or a solid oxide electrolysis cell (SOEC). SOFC can efficiently convert the chemical energy in hydrogen, methane or other hydrocarbons into electrical energy, while SOEC can use electrical energy to prepare hydrogen or other hydrocarbon fuels, thereby storing electrical energy in the form of chemical energy. A reversible solid oxide battery is generally composed of a hydrogen electrode-electrolyte-oxygen electrode. Catalytic oxidation or reaction of hydrogen occurs on the hydrogen electrode, reduction or generation reaction of oxygen occurs on the oxygen electrode, and ion conduction occurs in the middle electrolyte. [0003] Perovskite oxides are often used as oxygen electrodes for reversible solid oxide batteries, with high ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90
CPCH01M4/8605H01M4/8652H01M4/8828H01M4/8889H01M4/9033H01M4/9091H01M2008/1293Y02E60/50
Inventor 关成志彭程肖国萍王建强
Owner 上海氢程科技有限公司
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