阅读说明：本技术 一种阴极汇流层材料及汇流层的制备方法 (Cathode bus layer material and preparation method of bus layer ) 是由 李成新 高九涛 冯琪雁 李长久 于 2020-04-27 设计创作，主要内容包括：本发明提供了一种阴极汇流层材料及汇流层的制备方法。其中,所述方法为：将阴极汇流层材料置于还原性气氛中进行热处理,得到还原后的阴极汇流层材料；将还原后的阴极汇流层材料与溶剂混合,配成浆料；将浆料涂覆在电池阴极的表面,制备覆有浆料层的电池；对所述覆有浆料层的电池,进行氧化处理,制备具有成型的阴极汇流层的电池。本发明采用具有氧化还原特性的尖晶石型结构物质作为阴极汇流层材料,通过利用尖晶石型结构物质的氧化还原特性,实现阴极汇流层在较低温度下烧结成型,以实现低温制备阴极汇流层的目的。(The invention provides a cathode bus layer material and a preparation method of a bus layer. Wherein, the method comprises the following steps: placing the cathode bus layer material in a reducing atmosphere for heat treatment to obtain a reduced cathode bus layer material; mixing the reduced cathode confluence layer material with a solvent to prepare slurry; coating the slurry on the surface of the cathode of the battery to prepare the battery covered with the slurry layer; and (3) carrying out oxidation treatment on the battery coated with the slurry layer to prepare the battery with the formed cathode confluence layer. The cathode collector layer is sintered and molded at a lower temperature by using the redox property of the spinel-type structure substance, so that the purpose of preparing the cathode collector layer at a low temperature is achieved.)

1. A cathode bus layer material, wherein the cathode bus layer material comprises a spinel-type structure substance; wherein the spinel-structured substance has redox characteristics.

2. The cathode bus layer material of claim 1, wherein the spinel-structured material has a general structural formula AB₂O₄；

Wherein the ratio of the total atomic number of A and B to the atomic number of O is 3: 4;

under the condition that the total atomic number is constant, the content ratio of A and B can be adjusted.

3. The cathode bus bar material of claim 2, wherein the AB is₂O₄The main constituent elements of (1) include manganese, cobalt, oxygen; or manganese, copper, oxygen; or iron, nickel, oxygen.

4. The cathode bus bar material according to claim 1, wherein the spinel-type structure substance is subjected to reduction treatment, and the reduced spinel-type structure substance is converted into a loose structure in a reduced state in whole or in part;

the reduction structure is changed into a compact spinel structure again after being subjected to peroxidation treatment, and particles grow and are connected with each other.

5. The cathode bus bar material according to claim 1, wherein the spinel-type structure substance is in a powder form, and the particle size of the powder is 50nm to 70 μm.

6. The cathode bus bar material of claim 1, wherein the bus bar material further comprises: lanthanum strontium cobalt iron, lanthanum nickelate, silver and gold.

7. The cathode bus layer material according to claim 6, wherein the content ratio of the spinel-structured substance in the bus layer material is 20% to 100%.

8. A method of making a cathode manifold layer, the method comprising:

step 1, placing the cathode bus-bar layer material of any one of claims 1-7 in a reducing atmosphere for heat treatment to obtain a reduced cathode bus-bar layer material;

step 2, mixing the reduced cathode bus layer material with a solvent to prepare slurry;

step 3, coating the slurry on the surface of the battery cathode to prepare a battery/battery system coated with a slurry layer;

and 4, carrying out oxidation treatment on the battery covered with the slurry layer to prepare a battery/battery system with a formed cathode junction layer.

9. The method of claim 8, wherein in step 1, the reducing atmosphere comprises hydrogen; the temperature of the heat treatment is 500-800 ℃; the time of the heat treatment is 3-10 h;

in the step 2, the solvent is one or more of terpineol, butyl carbitol acetate, ethylene glycol ethyl ether acetate, lecithin and anise oil;

in step 3, the thickness of the slurry layer is 100-500 μm;

in step 4, the oxidation treatment comprises sintering under the following conditions: the sintering temperature is 450-800 ℃, and the sintering time is 1-100 h; the thickness of the formed cathode confluence layer is 50-400 mu m.

10. The method of claim 8, wherein the reduced cathode bus material comprises a reduced spinel structure material having an overall loose reduced structure; or

The reduced spinel-type structural substance is a partially loose reduced-state structural tissue.

Technical Field

The invention relates to the technical field of materials, in particular to a cathode bus layer material and a preparation method of a bus layer.

Background

The SOFC unit is composed of electrolyte, anode or Fuel pole, cathode or air pole and connector or bipolar plate, because the unit Cell can only generate about 1V voltage, the power of the SOFC is limited, in order to make the SOFC possible to be used in practice, it is necessary to greatly increase the power of the SOFC.

However, current SOFCs generally exhibit a trend toward lower temperatures and some types of SOFCs do not allow processing at temperatures greater than 800 ℃. Therefore, it is very meaningful to develop a new solid oxide fuel cell cathode bus layer sintered and formed at a lower temperature to solve the above problems.

Disclosure of Invention

The invention provides a cathode bus layer material and a preparation method of a bus layer, which are used for solving the problems in the related art.

In a first aspect, the present invention provides a cathode bus layer material comprising a spinel structure material; wherein the spinel-structured substance has redox characteristics.

Preferably, the structural formula of the spinel-type structural substance is AB₂O₄；

Wherein the ratio of the total atomic number of A and B to the atomic number of O is 3: 4;

under the condition that the total atomic number is constant, the content ratio of A and B can be adjusted.

Preferably, the AB is₂O₄The main constituent elements of (1) include manganese, cobalt, oxygen; or manganese, copper, oxygen;or iron, nickel, oxygen.

Preferably, the spinel-type structural substance is subjected to reduction treatment, and the reduced spinel-type structural substance is completely or partially converted into a reduced loose structural tissue;

the reduction structure is changed into a compact spinel structure again after being subjected to peroxidation treatment, and particles grow and are connected with each other.

Preferably, the spinel-type structural substance is in the form of powder, and the particle size of the powder is 50nm to 70 μm.

Preferably, the bus bar layer material further comprises: lanthanum strontium cobalt iron, lanthanum nickelate, silver and gold.

Preferably, the concentration ratio of the spinel-type structure substance in the bus layer material is 20% to 100%.

In a second aspect, the present application provides a method of preparing a cathode manifold layer, the method comprising:

step 1, placing the cathode bus layer material in the first aspect in a reducing atmosphere for heat treatment to obtain a reduced cathode bus layer material;

step 2, mixing the reduced cathode bus layer material with a solvent to prepare slurry;

step 3, coating the slurry on the surface of the battery cathode to prepare a battery/battery system coated with a slurry layer;

and 4, carrying out oxidation treatment on the battery covered with the slurry layer to prepare a battery/battery system with a formed cathode junction layer.

Preferably, in step 1, the reducing atmosphere comprises hydrogen; the temperature of the heat treatment is 500-800 ℃; the time of the heat treatment is 3-10 h;

in the step 2, the solvent is one or more of terpineol, butyl carbitol acetate, ethylene glycol ethyl ether acetate, lecithin and anise oil;

in step 3, the thickness of the slurry layer is 100-500 μm;

in step 4, the oxidation treatment comprises sintering under the following conditions: the sintering temperature is 450-800 ℃, and the sintering time is 1-100 h; the thickness of the formed cathode confluence layer is 50-400 mu m.

Preferably, the reduced cathode bus bar layer material comprises a reduced spinel-type structural substance, and the reduced spinel-type structural substance is a completely loose reduced-state structural tissue; or the reduced spinel-type structural substance is a partially loose reduced-state structural tissue.

According to the cathode bus layer material and the preparation method of the bus layer, provided by the embodiment of the invention, the cathode bus layer is sintered and formed at a lower temperature by utilizing the redox characteristic of a spinel-type structural substance, so that the aim of preparing the cathode bus layer at a low temperature is fulfilled. And the spinel-type structure substance provided by the application begins to lose oxygen in the reducing atmosphere of more than 400 ℃, and can obtain oxygen in the subsequent oxidizing atmosphere to grow into a compact spinel structure again, adjacent reduced spinel particles can grow into a whole through the phase change, and finally independent spinel particles are combined together through the mode, so that the low-temperature forming effect is realized.

Drawings

FIG. 1 shows a flow chart of an embodiment of a method of making a cathode manifold layer of the present invention;

FIG. 2 is a schematic flow diagram illustrating the formation of a monolithic structure from a spinel structure of the present invention;

fig. 3 is a schematic diagram illustrating a process of forming a cathode bus layer on the cathode surface of the solid oxide fuel cell according to the embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below. The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.

The invention aims to provide a novel low-temperature formed solid oxide fuel cell cathode confluence layer, which is formed at a lower temperature, so that the effect of reducing the contact resistance between a cathode side and a next connector is achieved. The cathode bus layer material selected by the invention has the characteristics of being reduced and oxidized, and partial or all loose structural tissues are formed after being reduced, and in the process of being oxidized, the partial or all loose structural tissues can automatically grow and are connected with each other to obtain an integrated structure.

In a first aspect, the present invention provides a cathode bus layer material comprising a spinel structure material; wherein the spinel-structured substance has redox characteristics.

In the embodiment of the present invention, preferably, the structural formula of the spinel-structured material is AB₂O₄；

Wherein the ratio of the total atomic number of A and B to the atomic number of O is 3: 4;

under the condition that the total atomic number is constant, the content ratio of A and B can be adjusted.

In the embodiment of the invention, preferably, the AB₂O₄The main constituent elements of (1) include manganese, cobalt, oxygen; or manganese, copper, oxygen; or iron, nickel, oxygen;