阅读说明：本技术 一种新型双片一体sofc电池单元及制程和电池堆 (Novel double-sheet integrated SOFC cell unit, manufacturing process and cell stack ) 是由 温良成 曹更玉 梁咏芯 马泽荣 余思亭 何欣悦 梁晓贤 严日峰 柯旭阳 陈淑娴 于 2021-09-10 设计创作，主要内容包括：本发明公开了一种新型双片一体SOFC电池单元及制程和电池堆,所述电池单元包括中心支撑结构,所述中心支撑结构的前、后、左、右被阳极结构包覆,所述阳极结构的左、右两面上分别覆有电解质结构,所述电解质结构上覆有阴极结构,所述阴极结构上覆有外周支撑结构；所述电池堆包括多组电池堆单元,多组电池堆单元并行排列,每组电池堆单元包括一组由两片耐热不锈钢板并列连接的钢板组,两片耐热不锈钢板的相对应位置设有多个略大于阴极结构侧表面的方形孔,所述新型双片一体SOFC电池单元通过该方形孔安装在钢板组。本发明使固体氧化物燃料电池单元电池同时具备高机械强度,高电化学转换效率以及燃料利用率。(The invention discloses a novel double-piece integrated SOFC (solid oxide fuel cell) unit, a manufacturing process and a cell stack, wherein the cell unit comprises a central supporting structure, the front, the back, the left and the right of the central supporting structure are coated by an anode structure, the left and the right surfaces of the anode structure are respectively coated with an electrolyte structure, the electrolyte structure is coated with a cathode structure, and the cathode structure is coated with a peripheral supporting structure; the cell stack comprises a plurality of groups of cell stack units which are arranged in parallel, each group of cell stack unit comprises a group of steel plate groups which are connected in parallel by two heat-resistant stainless steel plates, a plurality of square holes slightly larger than the side surface of the cathode structure are arranged at the corresponding positions of the two heat-resistant stainless steel plates, and the novel double-integrated SOFC cell unit is arranged on the steel plate group through the square holes. The invention makes the solid oxide fuel cell unit cell have high mechanical strength, high electrochemical conversion efficiency and high fuel utilization rate.)

1. A novel double-sheet integrated SOFC battery unit is characterized in that the battery unit comprises a central supporting structure, the front, the back, the left and the right of the central supporting structure are coated by anode structures, the left and the right surfaces of each anode structure are respectively coated with an electrolyte structure, the electrolyte structure is coated with a cathode structure, and the cathode structure is coated with a peripheral supporting structure; the central supporting structure and the peripheral supporting structure adopt high-temperature-resistant metal foam cotton nets with catalytic activity.

2. The SOFC cell unit of claim 1, wherein the catalytically active refractory metal foam mesh is selected from one of nickel, platinum, rhodium, iridium, palladium, cobalt, iron, bismuth, titanium, chromium, manganese, copper or alloys thereof.

3. The SOFC cell unit of claim 1, wherein the electrolyte structure has a side surface edge length equal to a side surface edge length of the anode structure, wherein the cathode structure side surface has a side surface edge length less than a side surface edge length of the electrolyte structure, and wherein the peripheral support structure has a side surface edge length equal to a side surface edge length of the cathode structure.

4. The process for the production of a new two-piece integrated SOFC cell according to any of claims 1-3, comprising the steps of:

(1) preparing anode slurry, forming the anode slurry by a scraper to prepare an anode ceramic green body, and then heating and co-pressing the anode ceramic green body and a central support structure to prepare an SOFC unit cell anode support structure;

(2) preparing electrolyte slurry, forming the electrolyte slurry by a scraper to prepare an electrolyte ceramic green body, and heating and co-pressing the electrolyte ceramic green body and the ceramic green bodies on the left and right surfaces of the anode support structure to prepare a symmetrical half cell structure of the double-piece integrated SOFC unit cell;

(3) preparing cathode slurry, forming by a scraper to prepare a cathode ceramic green body, heating and co-pressing the cathode ceramic green body and the ceramic green bodies on the left and right surfaces of the symmetrical half-cell structure to synthesize a unit cell ceramic green body, and finally sintering to prepare the double-piece integrated SOFC cell unit.

5. The process of claim 4, wherein the solute portion of the anode slurry comprises, by mass, 80-92% of anode layer oxide powder, 1-5% of pore-forming agent, and 5-9% of additive for thin film process, wherein the anode layer oxide powder comprises anode catalytic powder and electrolyte powder in a mass ratio of 7-1: 3-9; the solute part in the electrolyte slurry consists of 80-92% of electrolyte powder, 1-3% of cosolvent and 8-13% of additive for thin film processing according to mass percentage; the solute part in the cathode slurry comprises, by mass, 80-92% of cathode layer oxide powder, 1-5% of pore-forming agent and 5-9% of additive in the film process, wherein the cathode layer oxide powder comprises cathode catalytic powder and electrolyte powder in a mass ratio of 7-1: 3-9.

6. A novel cell stack of a two-piece integrated SOFC cell unit based on any one of claims 1-3, wherein the cell stack comprises a plurality of groups of cell stack units, the plurality of groups of cell stack units are arranged in parallel, each group of cell stack units comprises a group of steel plates formed by connecting two heat-resistant stainless steel plates in parallel, a plurality of square holes slightly larger than the side surface of a cathode structure are formed in corresponding positions of the two heat-resistant stainless steel plates, the novel two-piece integrated SOFC cell unit is arranged on the steel plate group through the square holes and joints of the novel two-piece integrated SOFC cell unit assembly and the square holes are sealed by high-temperature airtight glue, and the anode structure and an electrolyte structure are positioned between the two heat-resistant stainless steel plates; the novel double-piece integrated SOFC battery unit and the connecting joint of the square hole are sealed by high-temperature airtight glue.

7. The stack of claim 6 where the anode structures of the novel two-piece integrated SOFC cells are staggered and apex contacted between two sheets of heat resistant stainless steel.

8. The stack of claim 6, wherein the central support structures of the SOFC cell units adjacent to each other up and down are connected or the same central support structure is used between two sheets of heat-resistant stainless steel plates; the upper end of the central support structure of the SOFC battery unit at the uppermost end is connected with the upper ends of the central support structures at the left and right adjacent uppermost ends through a connecting plate; the connecting plate is made of a metal material, and preferably the same as the central support structure.

9. The cell stack according to claim 7, characterized in that connecting rods are connected to the connecting plates, and the connecting rods are made of a metal material, preferably the same material as the central support structure; the connecting rod penetrates through the steel plate group and is isolated from the steel plate group by insulating glue.

10. The stack of claim 7 or 8 or 9, wherein the steel plate group is provided with holes for installing insulating hollow ceramics, and the insulating hollow ceramics are used as inlet and outlet pipelines for installing electrochemical reaction gases.

Technical Field

The invention relates to the field of new energy solid oxide fuel cell unit cell structure processing technology and innovative cell stack design, in particular to a novel double-sheet integrated SOFC cell unit, a processing procedure and a cell stack.

Background

According to the data display of the customs service obtained by the news center of the energy storage network in China, the imports of coal mines, crude oil and natural gas in China are continuously increased from 2009 to now, and the consumption ratio of clean energy is also continuously increased, which means that the energy demand in China is continuously increased and the development of code-added clean energy is also expanded in China. The SOFC is an energy storage system with the highest conversion efficiency in the renewable energy field, and therefore, although the SOFC has a high technical threshold, the SOFC is still one of the popular subjects in the new energy research field.

Although SOFCs have many potential to be developed as clean alternative energy sources, some parts still need to be further improved and strengthened in order to make the use ratio of SOFCs more popular. For example (Y)_0.08Zr_0.92)O_1.96(8 mol% yttria-stabilized zirconia, 8YSZ) is an electrolyte ceramic material which is commercialized at present, and the operating temperature is higher than that of the electrolyte ceramic material0.1 S.cm at 1000 DEG C^-1But the disadvantage of using SOFC at high temperature is 1. the interface of composition is easy to react; 2. the thermal stability is easy to be reduced when the paint is used at high temperature; 3. the interface joint degree is influenced by the expansion coefficient to be increased, and the battery is easy to crack due to high-temperature thermal stress; 4. in order to be stable at high temperatures, the choice of materials for the electrode and bipolar plate portions is limited, and this type of electrode and bipolar plate material is expensive, directly affecting the cost of the SOFC.

The root of the above problems is basically because the electrolyte part must have good conductivity at high temperature, because the first generation SOFC is an Electrolyte Supported Cell (ESC) with an electrolyte thickness of about 140-. One solution is to reduce the thickness of the electrolyte to reduce the resistance of the electrolyte portion, but if the electrolyte material used in the SOFC is too thin, the mechanical stability of the single cell is reduced, and the cell is easily brittle, making the assembly of the stack difficult and the seismic strength weak.

In order to overcome the problem of weak mechanical strength due to the thinning of the electrolyte, the task of maintaining the mechanical strength is transferred to the anode or the cathode, and thus a second generation SOFC (anode or cathode support cell, ASC or CSC) with an increased electrode thickness has been developed, in which the thickness of the electrolyte is greatly reduced to about 3-10 μm, the thickness of one of the anode or the cathode is increased to 500-600 μm, and the thickness of the other electrode is 30-60 μm. This method is effective for reducing the resistance value of the electrolyte portion, but the porous electrode portion is not strong enough in mechanical strength even if the thickness is increased. Therefore, if the improvement can be made directly from the electrolyte portion, the SOFC can be operated at a lower temperature while maintaining high mechanical strength of the electrolyte layer, and not only can the power of the cell operation be increased, but also if the operation temperature of the SOFC is lowered, the material selectivity between the electrode and the bipolar plate portion becomes more varied, and the manufacturing cost of the SOFC can be reduced.

The structure of SOFC unit cell is that 3 kinds of ceramic materials with different characteristics are used as cathode and anode and electrolyte respectively, and are combined into an integrated structure by the process technology. However, ceramic materials with different characteristics often exhibit different coefficients of thermal expansion and different shrinkage rates during sintering, resulting in bending deformation and even cracking of the SOFC unit cell structure. A common solution today is to incorporate electrolyte materials into the electrode materials to reduce the difference in thermal expansion coefficients between ceramic materials of different characteristics. Although this method does reduce the difference in shrinkage and reduces the problems of bending deformation and cracking of the structure during sintering, it still cannot completely eliminate the problem. In addition, the method usually incorporates different proportions of electrolyte material to access the electrolyte layer asymptotically, thereby increasing the number of process steps. And the incorporation of excessive electrolyte material into the electrode material also causes the impedance of the electrode to rise, thereby affecting the output efficiency of the unit cell.

Disclosure of Invention

In view of the above-mentioned deficiencies of the prior art, the present invention provides a novel dual-integrated SOFC cell unit, process and stack, which improves the solid oxide fuel cell unit from two aspects, 1, developing a novel cell unit structure from the cell unit structure, and 2, developing a stack structure suitable for the novel cell unit structure; the unit cell of the solid oxide fuel cell has high mechanical strength, high electrochemical conversion efficiency and high fuel utilization rate.

The invention adopts the specific technical scheme that:

a novel double-piece integrated SOFC cell unit comprises a central supporting structure, wherein the front, the back, the left and the right of the central supporting structure are coated by an anode structure, the left and the right surfaces of the anode structure are respectively coated with an electrolyte structure, the electrolyte structure is coated with a cathode structure, and the cathode structure is coated with a peripheral supporting structure; the central supporting structure and the peripheral supporting structure adopt high-temperature-resistant metal foam cotton nets with catalytic activity.

Further, the high-temperature resistant metal foam net with catalytic activity is selected from one of nickel, platinum, rhodium, iridium, palladium, cobalt, iron, bismuth, titanium, chromium, manganese, copper or alloy materials thereof.

Further, the side surface side length of the electrolyte structure is equal to the side surface side length of the anode structure, the side surface side length of the cathode structure is smaller than the side surface side length of the electrolyte structure, and the side surface side length of the peripheral support structure is equal to the side surface side length of the cathode structure.

Correspondingly, the invention also provides a manufacturing process of the novel double-sheet integrated SOFC unit, which comprises the following steps:

(1) preparing anode slurry, forming the anode slurry by a scraper to prepare an anode ceramic green body, and then heating and co-pressing the anode ceramic green body and a central support structure to prepare an SOFC unit cell anode support structure;

(2) preparing electrolyte slurry, forming the electrolyte slurry by a scraper to prepare an electrolyte ceramic green body, and heating and co-pressing the electrolyte ceramic green body and the ceramic green bodies on the left and right surfaces of the anode support structure to prepare a symmetrical half cell structure of the double-piece integrated SOFC unit cell;

(3) preparing cathode slurry, forming by a scraper to prepare a cathode ceramic green body, heating and co-pressing the cathode ceramic green body and the ceramic green bodies on the left and right surfaces of the symmetrical half-cell structure to synthesize a unit cell ceramic green body, and finally sintering to prepare the double-piece integrated SOFC cell unit.

Further, the solute part in the anode slurry is composed of 80-92% of anode layer oxide powder, 1-5% of pore-forming agent and 5-9% of additive in the film process according to the mass percentage, wherein the anode layer oxide powder is composed of anode catalytic powder and electrolyte powder according to the mass ratio of 7-1: 3-9; the solute part in the electrolyte slurry consists of 80-92% of electrolyte powder, 1-3% of cosolvent and 8-13% of additive for thin film processing according to mass percentage; the solute part in the cathode slurry comprises, by mass, 80-92% of cathode layer oxide powder, 1-5% of pore-forming agent and 5-9% of additive in the film process, wherein the cathode layer oxide powder comprises cathode catalytic powder and electrolyte powder in a mass ratio of 7-1: 3-9.

The invention also provides a cell stack based on the novel double-integrated SOFC cell unit, the cell stack comprises a plurality of groups of cell stack units, the plurality of groups of cell stack units are arranged in parallel, each group of cell stack units comprises a group of steel plate groups formed by connecting two heat-resistant stainless steel plates in parallel, a plurality of square holes slightly larger than the side surface of the cathode structure are arranged at corresponding positions of the two heat-resistant stainless steel plates, the novel double-integrated SOFC cell unit is arranged on the steel plate group through the square holes and seals the joint of the novel double-integrated SOFC cell unit assembly and the square holes by high-temperature airtight glue, wherein the anode structure and the electrolyte structure are positioned between the two heat-resistant stainless steel plates; the novel double-piece integrated SOFC battery unit and the connecting joint of the square hole are sealed by high-temperature airtight glue.

Furthermore, the anode structures of a plurality of novel double-sheet integrated SOFC unit cells are staggered and in vertex contact between two heat-resistant stainless steel plates.

Furthermore, between the two heat-resistant stainless steel plates, the central support structures of the SOFC battery units which are adjacent up and down are connected or the same central support structure is adopted; the upper end of the central support structure of the SOFC battery unit at the uppermost end is connected with the upper ends of the central support structures at the left and right adjacent uppermost ends through a connecting plate; the connecting plate is made of a metal material, and preferably the same as the central support structure.

Furthermore, the connecting plate is connected with a connecting rod, the connecting rod is made of a metal material, and preferably the material is the same as that of the central support structure; the connecting rod penetrates through the steel plate group and is isolated from the steel plate group by insulating glue.

Furthermore, the steel plate group is provided with a hole for installing insulating hollow ceramics, and the insulating hollow ceramics are used for installing an inlet and outlet pipeline of electrochemical reaction gas.

The invention has the beneficial effects that:

1. the novel double-sheet integrated SOFC unit provided by the invention can be regarded as combining two cell units into one, and has the most direct advantages of saving the using amount of bipolar plates and reducing the volume of a cell stack.

2. The invention takes the central supporting structure (high temperature resistant metal material with catalytic activity) and the anode as the symmetrical center, which can effectively absorb the stress generated in the sintering process and the mechanical stress when assembling the cell stack.

3. The structure of the two-piece integrated SOFC unit cell of the invention can be regarded as having twice the cathode reaction area compared to the conventional SOFC unit cell. In general, the catalytic reactivity of the cathode is much less than that of the anode catalytic material, which is why commercial SOFC unit cells of the electrode-supported type typically use the anode as a support structure. Therefore, the invention enlarges the cathode reaction area, and leads the electrochemical reaction of the SOFC unit cell to be smoother, thereby avoiding the generation of polarization phenomenon.

4. Compared with the conventional SOFC cell stack, the cell stack designed by the invention omits complicated gas flow channel scoring, only cuts the clamping grooves of the SOFC unit cells by using two sheet steel plates, and guides fuel gas to pass through an anode catalytic region through staggered positions, so that the fuel utilization rate of the whole device is improved. And the battery pack can be connected in parallel or in series at will.

5. The whole thickness of the combined unit (a group of cell stacks) of the steel plate group and the SOFC unit cell is less than 5 mm. The unit batteries between each group of steel plate groups are connected in parallel; and the steel plate group and the combined unit of the SOFC unit cell can be connected in series optionally. Approximately 520 cells can be placed in a stack of 50x50x20 cubic centimeters in volume. At a power density of about 400mW/cm²Calculating the reaction area of 81cm²The output power per chip is about 64.8W (64.8W is 32.4x2, because it is a double chip). The structure of the double-integrated SOFC unit cell is estimated to be matched with an innovative cell stack structure, and the output power can be 33.696 kW. FIG. 15 is a 700 Watt commercial SOFC stack having a volume of about 4536cm³. The present invention is about 48 times as much.

Drawings

Fig. 1 is a schematic front view of a novel two-piece integrated SOFC cell unit;

fig. 2 is a schematic top view of a novel two-piece integrated SOFC cell unit;

FIG. 3 is a side view of a steel plate pack;

fig. 4 is a schematic view of the installation of a novel two-piece integrated SOFC cell unit on a steel plate stack;

FIG. 5 is a schematic diagram of a parallel arrangement of a plurality of stack units in a stack;

FIG. 6 is a partial structural view showing the structure of each stack unit;

FIG. 7 is a side view of a cell stack;

FIG. 8 is a schematic diagram of the series connection between the stack units in each stack;

FIG. 9 is a schematic diagram of parallel connection between sets of stack units in a stack

FIG. 10 shows a 3-layer structure of anode terminal in SOFC cell unit;

FIG. 11 shows a 3-layer matching structure of the cathode terminal in the SOFC cell unit;

fig. 12 shows the structure of one end of a SOFC cell unit;

fig. 13 is a support structure for an anode terminal in a SOFC cell unit;

fig. 14 is a SOFC cell unit structure;

FIG. 15 shows a volume of about 4536cm³A commercial SOFC cell stack with an output power of 700 watts.

Detailed Description

To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Example 1

Referring to fig. 1-2, the present embodiment provides a novel dual-sheet integrated SOFC cell unit, where the cell unit includes a central support structure 1, the central support structure 1 is covered by an anode structure 2 at the front, back, left, and right sides, the anode structure 2 is covered by an electrolyte structure 3 on the left and right sides, the electrolyte structure 3 is covered by a cathode structure 4, and the cathode structure 4 is covered by a peripheral support structure 5; the central supporting structure 1 and the peripheral supporting structure 5 adopt a high-temperature-resistant metal foam net with catalytic activity, and the high-temperature-resistant metal foam net with catalytic activity can be made of one material selected from nickel, platinum, rhodium, iridium, palladium, cobalt, iron, bismuth, titanium, chromium, manganese, copper and alloy materials thereof. As can be seen from fig. 1, the side surface of the electrolyte structure 3 has a side length equal to that of the side surface of the anode structure 2, the side surface of the cathode structure 4 has a side length smaller than that of the side surface of the electrolyte structure 3, the side surface of the peripheral support structure 5 has a side length equal to that of the side surface of the cathode structure 4, and the cathode structure is slightly smaller than the electrolyte structure in design for convenient assembly into a cell stack architecture.

Example 2

The present embodiment provides a cell stack based on the novel dual-integrated SOFC cell unit provided in embodiment 1, where the cell stack includes multiple groups of cell stack units, as shown in fig. 5, the multiple groups of cell stack units are arranged in parallel, each group of cell stack unit includes a group of steel plate groups (as shown in fig. 3) formed by two heat-resistant stainless steel plates 6 connected in parallel, multiple square holes slightly larger than the side surface of the cathode structure are formed in corresponding positions of the two heat-resistant stainless steel plates, the novel dual-integrated SOFC cell unit is mounted on the steel plate groups through the square holes, as shown in fig. 4 and 6, the anode structure and the electrolyte structure are located between the two heat-resistant stainless steel plates; the novel double-piece integrated SOFC battery unit and the connecting joint of the square hole are sealed by high-temperature airtight glue.

As shown in fig. 6, the anode structures of the novel two-piece integrated SOFC cell units are staggered and apex-contacted between two heat-resistant stainless steel sheets. To ensure that the passage of the fuel gas must pass inside the anode structure layer. The central support structures of the SOFC battery units which are adjacent up and down are connected or the same central support structure is adopted between the two heat-resistant stainless steel plates; and the upper end of the central support structure of the uppermost SOFC battery unit is connected with the upper ends of the left and right adjacent uppermost central support structures through a connecting plate 7, and the connecting plate is made of a metal material (mainly used for conducting electricity), preferably the same as the material for making the central support structure. The connecting plate 7 is connected with a connecting rod 8, the connecting rod 8 is made of a metal material, and the preferable material is the same as that of the central support structure; the connecting rod 8 penetrates through the steel plate group and is isolated from the steel plate group by insulating glue.

The steel plate group is provided with holes, as shown in fig. 7, only the steel plate at the leftmost side is not provided with holes, and the rest steel plates are provided with holes for mounting insulating hollow ceramics 9, and the mounted insulating hollow ceramics are used for mounting an inlet and outlet pipeline 10 of electrochemical reaction gas (fuel tail gas). As can be seen from fig. 7, in the cell stack provided by this embodiment, the complicated gas flow channel scribing is omitted in the inner side of the fuel gas channel plate group (i.e. between two connected heat-resistant stainless steel plates) and in the outer side of the air channel plate group.

The battery stack units can be connected in series or in parallel, as shown in fig. 8, the battery stack units can be connected in series, as shown in fig. 9, the battery stack units can be connected in parallel, as can be seen from fig. 8 and 9, no matter the battery stack units are connected in parallel or in series, only a lead is needed to connect the connecting rods extending out of each battery stack unit or the steel plates or the connecting rods between the steel plates, the operation is convenient, the use is convenient, fig. 8 and 9 are only examples, and part of the battery stack units can be selected to be connected in series and part of the battery stack units can be connected in parallel according to actual needs.

Example 3

This embodiment provides the novel two-piece integrated SOFC cell unit provided in embodiment 1 and the process of manufacturing the cell stack provided in embodiment 2, including the following steps:

the anode slurry formulation electrolyte powder can be SDC ((Sm)_0.2Ce_0.8)O_1.9) The anode catalytic powder is NiO. NiO and SDC electrolyte powder are prepared into anode layer oxide powder with 3 different proportions according to the proportion of 7:3,4:6 and 1: 9. 3 anode layer oxide powders with different proportions are respectively prepared into 3 slurries, and the anode layer oxide powders account for 90 percent of the formula; the pore-forming agent can be activated carbon powder, starch and ethyl cellulose, and accounts for 1 percent; the slurry additive for the film process is 6.5% of polyvinyl butyral, 0.5% of polyethylene glycol, 0.5% of dibutyl phthalate, 0.5% of glycerol, 0.5% of corn oil and 0.5% of TEA (lauryl sulfate); solvent part: MEK (methyl ethyl ketone) 35 ml/100 g solute, 95% ethanol 20 ml/100 g solute, acetone 15 ml/100 g solute. The anode ceramic green film is formed by a scraper forming process with a 500 micron scraper gap and a rolling speed of 500 mm/min, and the heating and drying area is divided into two sections of 70 degrees/50 cm and 90 degrees/50 cm.

The anode ceramic green film and the nickel alloy metal foam cotton net are combined in a heating and co-pressing mode and used for manufacturing an SOFC unit cell anode supporting structure. Taking a nickel alloy metal foam cotton net, and sequentially superposing anode ceramic blanks prepared from SDC electrolyte and NiO powder according to the ratio of 3:7,6:4 and 9:1 on the front side, the rear side and the left side of the nickel alloy metal foam cotton net from inside to outside by taking the nickel alloy metal foam cotton net as a center. And hot-pressing at 60 ℃ and 120 kg/sq cm to obtain the anode structure green body of the double-piece integrated SOFC unit component.

The electrolyte slurry formulation was 8YSZ (8 mole% Y)₂O₃+92mole％ZrO₂)90 percent; the fluxing agent can be Li₂CO₃1 percent; the slurry additive for the film process comprises 8% of polyvinyl butyral, 0.2% of polyethylene glycol, 0.5% of dibutyl phthalate, 0.1% of glycerol, 0.1% of corn oil and 0.1% of TEA (lauryl sulfate); solvent part: MEK (methyl ethyl ketone) 40 ml/100 g solute, 95% ethanol 25 ml/100 g solute, acetone 15 ml/100 g solute and ultrapure water 5 ml/100 g solute. The ceramic green film of the electrolyte is prepared by a 30-micron scraper gap, a winding speed is 1500 mm/min, and a heating and drying area is divided into two sections of 70 degrees/50 cm and 90 degrees/50 cm. The electrolyte ceramic green body formed by a scraper is combined with the left and right sides of the ceramic green body of the anode supporting structure by heating and co-pressing to form a symmetrical half cell structure of the double-piece integrated SOFC unit cell. Two pieces of electrolyte ceramic green bodies are respectively superposed on the left and right surfaces of the anode structure green body and are hot-pressed into a half-cell structure green body of a double-piece integrated SOFC cell unit component at 70 ℃ and under the pressure of 120 kilograms per square centimeter.

And preparing cathode slurry. The electrolyte powder is SDC ((Sm)_0.2Ce_0.8)O_1.9) The cathode catalytic powder is LSM ((La)_0.8Sr_0.2)MnO₃-_δ). Any cathode catalytic powder and any electrolyte powder are prepared into 3 cathode layer oxide powders with different proportions according to the proportions of 7:3,4:6 and 1: 9. 3 cathode layer oxide powders with different proportions are respectively prepared into 3 slurries, and the formula is 86 percent of the cathode layer oxide powder; the pore former may be activeCarbon powder, starch and ethyl cellulose, accounting for 5 percent; the slurry additive for the film process is 6.5% of polyvinyl butyral, 0.5% of polyethylene glycol, 0.5% of dibutyl phthalate, 0.5% of glycerol, 0.5% of corn oil and 0.5% of TEA (lauryl sulfate); solvent part: MEK (methyl ethyl ketone) 30 ml/100 g solute, 95% ethanol 20 ml/100 g solute, acetone 10 ml/100 g solute. The cathode slurry is formed into cathode ceramic green bodies by a scraper, 3 cathode ceramic green bodies with different proportions are prepared by cathode catalytic powder and electrolyte powder according to the proportion of 1:9,4:6 and 7:3 and are sequentially superposed on the two surfaces of the green bodies with the half-cell structure of the double-integrated SOFC cell unit assembly, and the green bodies with the double-integrated SOFC cell unit assembly are formed by hot pressing at 80 ℃ and the pressure of 120 kilograms per square centimeter.

Sintering to obtain the double-piece integrated SOFC unit cell. The temperature procedure of sintering is room temperature-1 degree/min-highest temperature, the temperature is maintained for 5 hours-1 degree/min-temperature reduction to 1000 degrees-the procedure is finished, and the temperature in the natural furnace is reduced to room temperature. The maximum temperature was 1300 degrees. FIG. 10 is a 3-layer matching structure of the anode terminal; FIG. 11 shows a 3-layer matching structure of the cathode terminal; fig. 12 shows the structure of one end of a two-piece integrated SOFC unit cell; fig. 13 is a support structure for the anode terminal in a two-piece integrated SOFC unit cell; fig. 14 is a two-piece integrated SOFC unit cell structure.

Although the embodiments have been described, once the basic inventive concept is obtained, other variations and modifications of these embodiments can be made by those skilled in the art, so that the above embodiments are only examples of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes using the contents of the present specification and drawings, or any other related technical fields, which are directly or indirectly applied thereto, are included in the scope of the present invention.