Fuel electrode-supported soc unit and method of making

Abstract

Fuel electrode support SOC unit and preparation method, wherein the fuel electrode support SOC unit structure includes a fuel electrode support prepared by doped zirconia and nickel oxide with a thickness of 0.25-1 mm and a porosity of 20%-55%, a fuel electrode functional layer prepared by doped zirconia and nickel oxide with a thickness of 10-40 μm and a porosity of 20%-45%, a first electrolyte layer prepared by doped zirconia with a thickness of 4-35 μm, a second electrolyte layer prepared by doped cerium oxide with a thickness of 0.2-4 μm, and an air electrode functional layer prepared by doped cerium oxide, perovskite conductive material with a thickness of 10-40 μm and a porosity of 20%-45%; the method for preparing the fuel electrode support SOC unit has 12 specific process steps and conditions, has the advantages of large unit process adjustability, low preparation cost, good process repeatability, strong reliability and the like, and is suitable for application in the field of sheet SOC stacks.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of solid oxide fuel cell and electrolysis cell, in particular to a fuel electrode supported SOC unit and a preparation method, which is suitable for the application in the field of sheet SOC stack. BACKGROUND

[0002] Solid oxide electrolysis cell (SOEC) and solid oxide fuel cell (SOFC) are essentially reverse modes of each other, as an electrochemical energy conversion device for hydrogen production and hydrogen use, which has important significance for realizing energy structure adjustment.

[0003] The existing flat plate type single cell unit technical route is mainly divided into three kinds: (1) fuel electrode support type; (2) electrolyte support type; (3) metal support type. Among them, the fuel electrode supported single cell unit usually uses nickel-based zirconia as the fuel electrode material, and zirconia doped and ceria doped as the electrolyte material. The support body adopts flow casting or injection molding process, and the fuel electrode functional layer, electrolyte or composite electrolyte are sequentially deposited on the embryo, and the cathode layer is deposited after co-firing. In order to obtain a flat single cell unit that meets the requirements of the stack, sintering cover plate pressure firing and secondary shaping process are generally used to reduce the influence of thermal expansion coefficient mismatch, but it fails to meet the requirements.

[0004] Therefore, it is of great significance to develop a fuel electrode supported SOC unit and a preparation method. SUMMARY

[0005] The task of the present application is to overcome the shortcomings of the prior art, and to provide a fuel electrode supported SOC unit and a preparation method.

[0006] The task of the present application is accomplished by the following technical scheme:

[0007] The fuel electrode supported SOC unit and the preparation method, wherein the structure of the fuel electrode supported SOC unit comprises a fuel electrode support body prepared from doped zirconia and nickel oxide with a thickness of 0.25-1mm and a porosity of 20%-55%, a fuel electrode functional layer prepared from doped zirconia and nickel oxide with a thickness of 10-40μm and a porosity of 20%-45%, a first electrolyte layer prepared from doped zirconia with a thickness of 4-35μm, a second electrolyte layer prepared from doped ceria with a thickness of 0.2-4μm, and an air electrode functional layer prepared from doped ceria and perovskite conductive material with a thickness of 10-40μm and a porosity of 20-45%; the method for preparing the fuel electrode supported SOC unit has specific process steps and conditions.

[0008] Compared with the prior art, the present application has the following advantages or effects:

[0009] Because electrolyte, fuel electrode function and partial fuel electrode support layer multilayer casting are adopted, the process flow is reduced, and the uneven deformation of electrolyte layer caused by hot pressing lamination is reduced; at the same time, because the fuel electrode support adopts multilayer embryo lamination hot pressing, the material ratio can be flexibly adjusted, so that the thermal expansion coefficient gradient of each layer of material is matched, so that the important defect problems such as single cell sintering warping and cracking can be solved, and the warping height is ≤2mm; in addition, because the electrolyte is a composite electrolyte, the second electrolyte layer is deposited under the condition that the first electrolyte layer is not dense, the second electrolyte layer partially penetrates into the first electrolyte layer, and the bonding interface area of the two electrolyte interfaces is increased, so that the composite electrolyte bonding strength can be improved after co-sintering, and the service life of the battery can be effectively improved.

[0010] In summary, in addition to the above advantages or effects, the unit process has great adjustability, low preparation cost, good process repeatability, strong reliability and the like. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a fuel electrode support SOC unit and preparation method SOC unit structure schematic diagram according to the application.

[0012] Figure 2 It is Figure 1 The SOC unit 100 support structure schematic diagram of the method shown in the figure.

[0013] Figure 3 It is Figure 1 The SOC unit preparation process flow chart of the method shown in the figure.

[0014] The numbers in the drawings respectively represent:

[0015] 100. Fuel electrode support 101. One part 102. Two parts 103. Three parts 104. Four parts 105. Five parts 200. Fuel electrode functional layer 300. First electrolyte layer 400. Second electrolyte layer 500. Air electrode functional layer

[0016] The application will be further described in detail below in combination with the drawings. DETAILED DESCRIPTION

[0017] Referring to Figures 1-3A fuel electrode-supported SOC unit and a method for manufacturing the same, wherein the fuel electrode-supported SOC unit has a structure including a fuel electrode support 100 made of doped zirconia and nickel oxide having a thickness of 0.25 to 1 mm and a porosity of 20 to 55%, a fuel electrode functional layer 200 made of doped zirconia and nickel oxide having a thickness of 10 to 40 μm and a porosity of 20 to 45%, a first electrolyte layer 300 made of doped zirconia having a thickness of 4 to 35 μm, a second electrolyte layer 400 made of doped ceria having a thickness of 0.2 to 4 μm, and an air electrode functional layer 500 made of doped ceria and a perovskite conductive material having a thickness of 10 to 40 μm and a porosity of 20 to 45%; and the method for manufacturing the fuel electrode-supported SOC unit includes the following steps:

[0018] (1) depositing a first electrolyte layer 300 green film: grinding and dispersing a first electrolyte powder, an organic solvent, and an additive to form a first electrolyte slurry, performing a casting operation with a casting thickness of 10 to 40 μm, and drying for 12 hours to form a first electrolyte layer 300 green film at a drying temperature of 25 to 55°C;

[0019] (2) depositing a fuel electrode functional layer 200 green film: grinding and dispersing a fuel electrode functional layer powder, an organic solvent, and an additive to form a fuel electrode functional layer slurry, performing a casting operation on the dried first electrolyte layer 300 green film with a casting thickness of 20 to 60 μm, and drying for 12 hours to form a fuel electrode functional layer 200 green film at a drying temperature of 25 to 55°C;

[0020] (3) depositing a fuel electrode support layer 100 first section 101 green film: grinding and dispersing a fuel electrode support layer powder, an organic solvent, and an additive to form a fuel electrode support layer slurry, performing a casting operation on the dried fuel electrode functional layer green film with a casting thickness of 60 to 150 μm, and drying for 12 hours to form a fuel electrode support layer 100 first section 101 green film at a drying temperature of 25 to 55°C;

[0021] (4) respectively preparing fuel electrode support layer 100 second to fifth sections 102 to 105 green films: grinding and dispersing a fuel electrode support layer powder, an organic solvent, and an additive to form a fuel electrode support layer slurry, performing a casting operation with a casting thickness of 60 to 550 μm, and drying for 12 hours to form fuel electrode support layer 100 sections 102 to 105 green films at a drying temperature of 25 to 55°C;

[0022] (5) cutting the green films obtained in steps (3) and (4) to the same size;

[0023] (6) laminating and pressing the cut films obtained in step (5);

[0024] (7) The compression film obtained in step (6) is packaged and isostatic pressed at a temperature of 20-65 DEG C and a pressure of 50-80 MPa for 5-45 min;

[0025] (8) Defatting and pre-sintering: the temperature is controlled to increase at a rate of 0.1-0.6 DEG C / min, and the first temperature is maintained for 1-3 hr; the temperature is controlled to increase at a rate of 0.8-4 DEG C / min from the first temperature to the maximum temperature, the maximum temperature is in the range of 1180-1260 DEG C, and the maximum temperature is maintained for 0.5-3 hr;

[0026] (9) The second electrolyte layer 400 is deposited by mixing and dispersing the second electrolyte powder, solvent and additive to form a second electrolyte slurry, and then performing ultrasonic spraying on the film obtained in step (8), and drying for 10-15 min, with the substrate set at a temperature of 85-105 DEG C, and repeating the spraying and drying for 2-8 times, and the thickness is 0.5-5 mu m;

[0027] (10) Sintering: the temperature is controlled to increase at a rate of 0.3-0.8 DEG C / min from room temperature to the first temperature, and the first temperature is maintained for 1-3 hr; the temperature is controlled to increase at a rate of 1.2-5 DEG C / min from the first temperature to the maximum temperature, the maximum temperature is in the range of 1320-1470 DEG C, and the maximum temperature is maintained for 0.5-3 hr;

[0028] (11) The air electrode functional layer 500 is deposited by grinding and dispersing the air electrode functional powder, solvent and additive to form an air electrode functional layer slurry, and then performing silk screen printing on the film obtained in step (10), with the thickness being 10-40 mu m, and drying for 2 hr to form an air electrode functional layer element film, and the drying temperature is 25-65 DEG C;

[0029] (12) Defatting and sintering: the temperature is controlled to increase at a rate of 0.1-0.6 DEG C / min from room temperature to the first temperature, and the first temperature is maintained for 1-3 hr; the temperature is controlled to increase at a rate of 0.8-4 DEG C / min from the first temperature to the maximum temperature, the maximum temperature is in the range of 920-1080 DEG C, and the maximum temperature is maintained for 0.5-3 hr.

[0030] The specific process steps and conditions of the application can be further

[0031] The support body 100 is a single layer structure of a first part 101 or a multi-layer structure of the first part 101 plus a second part 102, a third part 103, a fourth part 104 or a fifth part 105.

[0032] The doping element of the unit doped zirconia is at least one of yttrium, scandium and cerium.

[0033] The thickness of the unit support body 100 is 0.3-0.5 mm, and the porosity is 30-40%.

[0034] The thickness of the unit fuel electrode functional layer 200 is 15-25 μm, and the porosity is 30-40%.

[0035] The thickness of the unit first electrolyte layer 300 is 6-15 μm.

[0036] The thickness of the unit second electrolyte layer 400 is 1-2 μm.

[0037] The perovskite conductive material of the unit air electrode functional layer (500) is at least one of lanthanum strontium manganese, lanthanum strontium cobalt, lanthanum strontium cobalt iron, and lanthanum nickel cobalt.

[0038] The unit air electrode functional layer 500 is doped with cerium oxide and lanthanum strontium cobalt iron.

[0039] The thickness of the unit air electrode functional layer 500 is 15-25 μm, and the porosity is 30-40%.

[0040] In the method, the green body of each layer structure of the fuel electrode support 100 is stacked, isostatic pressed, and sintered to form a single-cell support, the thermal expansion coefficient of each single-cell support is adjusted, the thickness direction is gradually adapted to the thermal expansion coefficient of the electrolyte, and the single-cell is leveled.

[0041] In step (1) of the method, the electrolyte powder is doped with zirconium oxide, the organic solvent is at least two of anhydrous ethanol, toluene, dimethylbenzene, isopropyl alcohol, acetone, butanone, and ethylene glycol monobutyl ether, and the additive is at least one of polyvinyl butyral, polyvinyl alcohol, acrylic resin, ethyl cellulose and methyl cellulose, dibutyl phthalate, and fish oil.

[0042] In step (2) of the method, the fuel electrode functional layer 200 powder is at least two of doped zirconium oxide, doped cerium oxide, nickel oxide, and copper oxide, the organic solvent is at least two of anhydrous ethanol, toluene, dimethylbenzene, isopropyl alcohol, acetone, butanone, and ethylene glycol monobutyl ether, and the additive is at least one of polyvinyl butyral, polyvinyl alcohol, acrylic resin, ethyl cellulose and methyl cellulose, dibutyl phthalate, and fish oil.

[0043] In step (3) of the method, the layer powder of the fuel electrode support 100 part 101 is doped with zirconium oxide, nickel oxide, a pore-forming agent, and a thermal expansion coefficient adjusting phase, the pore-forming agent is one of graphite, carbon powder, polymethyl methacrylate, and starch, the pore-forming agent is added in an amount of 6-14% of the weight of the support layer powder, the thermal expansion coefficient adjusting phase is at least one of yttrium oxide, calcium oxide, copper oxide, aluminum oxide, magnesium oxide, iron oxide, aluminum titanate, and silicon carbide, the organic solvent is at least two of anhydrous ethanol, toluene, dimethylbenzene, isopropyl alcohol, acetone, butanone, and ethylene glycol monobutyl ether, and the additive is at least one of polyvinyl butyral, polyvinyl alcohol, acrylic resin, ethyl cellulose and methyl cellulose, dibutyl phthalate, and fish oil.

[0044] The method step (4) fuel electrode support 100 sub-portion 102-105 layer powder is doped zirconia, nickel oxide, pore-forming agent and thermal expansion coefficient adjusting phase, pore-forming agent is one of graphite, carbon powder, polymethyl methacrylate and starch, pore-forming agent addition amount is 6%-14% of the weight of the support layer powder, thermal expansion coefficient adjusting phase is at least one of yttria, calcium oxide, copper oxide, aluminum oxide, magnesium oxide, iron oxide, aluminum titanate, silicon carbide, at least two of the organic solvents are anhydrous ethanol, toluene, xylene, isopropyl alcohol, acetone, butanone and ethylene glycol monobutyl ether, at least one of the additives is polyvinyl butyral, polyvinyl alcohol, acrylic resin, ethyl cellulose and methyl cellulose, dibutyl phthalate, fish oil.

[0045] The method step (9) second electrolyte powder is at least one of nano-doped cerium oxide, cerium acetylacetone, cerium nitrate, gadolinium nitrate, samarium nitrate, at least one of the solvents used is methanol, ethanol, formic acid, acetic acid, ethyl acetate, butyl acetate, methoxy propanol, at least one of the additives used is ethylene glycol, glycerol, polyvinyl alcohol, carboxymethyl cellulose.

[0046] The method step (11) air electrode functional powder is doped cerium oxide, perovskite conductive material and pore-forming agent, perovskite conductive material is at least one of lanthanum strontium manganese, lanthanum strontium cobalt, lanthanum strontium cobalt iron, lanthanum nickel cobalt, pore-forming agent is one of graphite, carbon powder, polymethyl methacrylate and starch, at least one of the solvents used is ethanol, terpineol, xylene, ethyl acetate, butyl acetate, butyl carbitol, at least one of the additives used is polyvinyl butyral, polyvinyl alcohol, acrylic resin, ethyl cellulose and methyl cellulose, dibutyl phthalate, fish oil.

[0047] Embodiment

[0048] (1) Deposition of the first electrolyte layer element embryo membrane piece: 100g yttrium-stabilized zirconia powder, 40g isopropyl alcohol, 40g toluene and 0.8g fish oil are dispersed and ground, and are ready for use; 10g of polyvinyl butyral and 4g of dibutyl phthalate are added and ground, and are ready for use; the first electrolyte slurry obtained above is vacuum degassed, and is subjected to casting operation, with a casting thickness of 15μm, dried at 30℃ for 12hr to form a first electrolyte layer element embryo membrane piece.

[0049] (2) Depositing the fuel electrode functional layer element embryo membrane sheet: 50 g of yttrium-stabilized zirconium powder, 80 g of nickel oxide powder, 50 g of isopropyl alcohol, 50 g of toluene, and 1.2 g of fish oil are dispersed and ground, and are ready for use; 12 g of polyvinyl butyral and 5 g of dibutyl phthalate are added and ground, and are ready for use; the fuel electrode functional layer slurry obtained above is vacuum degassed, and is cast on the dried first electrolyte layer element embryo thin film to form a fuel electrode functional layer element embryo membrane sheet with a casting thickness of 45 μm and dried at 30°C for 12 hr.

[0050] (3) Depositing the fuel electrode support layer 101 sub-element embryo membrane sheet: 200 g of yttrium-stabilized zirconium powder, 250 g of nickel oxide powder, 25 g of yttrium oxide powder, 25 g of aluminum oxide powder, 50 g of graphite, 200 g of isopropyl alcohol, 200 g of toluene, and 5 g of fish oil are dispersed and ground, and are ready for use; 48 g of polyvinyl butyral and 20 g of dibutyl phthalate are added and ground, and are ready for use; the fuel electrode support layer slurry obtained above is vacuum degassed, and is cast on the dried fuel electrode functional layer element embryo thin film to form a fuel electrode support layer 101 sub-element embryo membrane sheet with a casting thickness of 120 μm and dried at 35°C for 12 hr.

[0051] (4) Depositing the fuel electrode support layer 100 sub-element embryo membrane sheet: 160 g of yttrium-stabilized zirconium powder, 240 g of nickel oxide powder, 50 g of aluminum titanate powder, 50 g of aluminum oxide powder, 60 g of graphite, 180 g of isopropyl alcohol, 180 g of toluene, and 5 g of fish oil are dispersed and ground, and are ready for use; 48 g of polyvinyl butyral and 20 g of dibutyl phthalate are added and ground, and are ready for use; the fuel electrode support layer slurry obtained above is vacuum degassed, and is cast to form a fuel electrode support layer 102 sub-element embryo membrane sheet with a casting thickness of 350 μm and dried at 35°C for 12 hr.

[0052] (5) The element embryo membrane sheets obtained in steps (3) and (4) are cut into the same size.

[0053] (6) The cut membrane sheets obtained in step (5) are laminated and pressed.

[0054] (7) The pressed membrane sheets obtained in step (6) are packaged and subjected to isostatic pressing at a temperature of 55°C and a pressure of 65 MPa for 20 min.

[0055] (8) Degreasing and pre-burning: room temperature-first temperature stage: control the heating rate at 0.5°C / min to 950°C, and maintain the temperature for 2.5 hr; first temperature-highest temperature stage: heating rate of 2°C / min, highest temperature of 1250°C, and maintain the highest temperature for 2 hr.

[0056] (9) Depositing the second electrolyte layer, 15.5 g gadolinium-doped ceria powder, 10.2 g cerium acetylacetone hydrate, 1.2 g gadolinium nitrate hydrate, 60 g anhydrous ethanol, 30 g acetic acid and 1.8 g glycerol are mixed and dispersed to form a second electrolyte slurry, and ultrasonic spraying is performed on the membrane piece obtained in step (8), and the device substrate is dried for 15 min, the substrate is set to a temperature of 105℃, and the spraying and drying are repeated for 3 times, and the thickness is 3 μm.

[0057] (10) Sintering: room temperature-first temperature stage: control the heating rate to 0.3℃ / min to 550℃, and keep the temperature for 2.5 hr; first temperature-highest temperature stage: heating rate of 2.5℃ / min, highest temperature of 1420℃, and keep the highest temperature for 3 hr.

[0058] (11) Depositing the air electrode functional layer, 30 g lanthanum-strontium-cobalt-iron powder, 30 g gadolinium-doped ceria, 3.6 g graphite, 2.4 g acrylic resin, 40 g terpineol, 10 g butyl acetate, and 1.2 g fish oil are ground and dispersed to form an air electrode functional layer slurry, and silk screen printing is performed on the membrane piece obtained in step (10), the thickness is 35 μm, and the air electrode functional layer precursor membrane piece is formed by drying at 55℃ for 2 hr.

[0059] (12) Defatting and sintering: room temperature-first temperature stage: control the heating rate to 0.5℃ / min to 900℃, and keep the temperature for 1 hr at the first temperature; first temperature-highest temperature stage: heating rate of 2℃ / min, highest temperature of 1100℃, and keep the highest temperature for 2 hr.

[0060] As described above, the application can be better implemented. The above-mentioned embodiments are only the best implementation manners of the application, but the implementation manners of the application are not limited to the above-mentioned embodiments, and other changes, modifications, replacements, combinations and simplifications made without departing from the spirit and principle of the application shall be equivalent replacement manners, and all shall be included in the protection scope of the application.

Claims

1. A fuel pole supported SOC unit, characterized by The fuel electrode support SOC unit structure layer comprises, from bottom to top, a fuel electrode support (100) prepared from doped zirconia and nickel oxide with a thickness of 0.25-1 mm and a porosity of 20-55%, a fuel electrode functional layer (200) prepared from doped zirconia and nickel oxide with a thickness of 10-40 μm and a porosity of 20-45%, a first electrolyte layer (300) prepared from doped zirconia with a thickness of 4-35 μm, a second electrolyte layer (400) prepared from doped ceria with a thickness of 0.2-4 μm, and an air electrode functional layer (500) prepared from doped ceria and perovskite conductive material with a thickness of 10-40 μm and a porosity of 20-45%.

2. The unit of claim 1, characterized in that The doped element of the doped zirconia is at least one of yttrium, scandium and cerium.

3. The unit of claim 1, wherein The fuel electrode support (100) has a thickness of 0.3-0.5 mm and a porosity of 30-40%.

4. The unit of claim 1, wherein The fuel electrode functional layer (200) has a thickness of 15-25 μm and a porosity of 30-40%.

5. The unit of claim 1, wherein The first electrolyte layer (300) has a thickness of 6-15 μm.

6. The unit of claim 1, wherein The second electrolyte layer (400) has a thickness of 1-2 μm.

7. The unit of claim 1, wherein The perovskite conductive material of the air electrode functional layer (500) is at least one of lanthanum-strontium-manganese, lanthanum-strontium-cobalt, lanthanum-strontium-cobalt-iron and lanthanum-nickel-cobalt.

8. The unit of claim 1, wherein The air electrode functional layer (500) is doped ceria and lanthanum-strontium-cobalt-iron.

9. The unit of claim 1 or 8, characterized by The air electrode functional layer (500) has a thickness of 15-25 μm and a porosity of 30-40%.

10. A method for making a fuel pole supported SOC unit, characterized by The process steps and conditions are as follows: (1) depositing a first electrolyte layer (300) element blank film: grinding and dispersing the first electrolyte powder, organic solvent and additive to form a first electrolyte slurry, performing casting operation with a casting thickness of 10-40 μm, drying for 12 h to form a first electrolyte layer (300) element blank film, and drying at a temperature of 25-55 ℃; (2) depositing a fuel electrode functional layer (200) element blank film: grinding and dispersing the fuel electrode functional layer powder, organic solvent and additive to form a fuel electrode functional layer slurry, performing casting operation on the dried first electrolyte layer (300) element blank film with a casting thickness of 20-60 μm, drying for 12 h to form a fuel electrode functional layer (200) element blank film, and drying at a temperature of 25-55 ℃; (3) Depositing the fuel electrode support body (100) one section (101) green membrane sheet: grinding and dispersing fuel electrode support body powder, organic solvent and additives to form fuel electrode support body slurry, performing casting operation on the dried fuel electrode functional layer green film, casting thickness 60-150 μm, drying for 12 h to form the fuel electrode support body (100) one section (101) green membrane sheet, drying temperature 25-55 °C; (4) Preparing fuel electrode support body (100) second to fifth section (102-105) green membrane sheets respectively: grinding and dispersing fuel electrode support body powder, organic solvent and additives to form fuel electrode support body slurry, performing casting operation, casting thickness 60-550 μm, drying for 12 h to form the fuel electrode support body (100) second to fifth section (102-105) green membrane sheets, drying temperature 25-55 °C; (5) Cutting the green membrane sheets obtained in steps (3) and (4) into the same size; (6) Laminating and pressing the cut membrane sheets obtained in step (5); (7) Packaging and isostatic pressing the pressed membrane sheets obtained in step (6), processing temperature 20-65 °C, pressure 50-80 MPa, pressure holding time 5-45 min; (8) Defatting and pre-sintering: room temperature-first temperature stage: controlling the heating rate 0.1-0.6 °C / min, first temperature 950 °C, holding for 1-3 h; first temperature-highest temperature stage: heating rate 0.8-4 °C / min, highest temperature range 1180-1260 °C, highest temperature holding for 0.5-3 h; (9) Depositing the second electrolyte layer (400), mixing and dispersing second electrolyte powder, solvent and additives to form second electrolyte slurry, performing ultrasonic spraying operation on the membrane sheet obtained in step (8), drying for 10-15 min, setting the substrate temperature to 85-105 °C, repeating the spraying and drying for 2-8 times, and depositing thickness 0.5-5 μm; (10) Sintering: room temperature-first temperature stage: controlling the heating rate 0.3-0.8 °C / min, first temperature 550 °C, holding for 1-3 h; first temperature-highest temperature stage: heating rate 1.2-5 °C / min, highest temperature range 1320-1470 °C, highest temperature holding for 0.5-3 h; (11) Depositing the air electrode functional layer (500), grinding and dispersing air electrode functional layer powder, solvent and additives to form air electrode functional layer slurry, performing silk screen printing operation on the membrane sheet obtained in step (10), thickness 10-40 μm, drying for 2 h to form the air electrode functional layer green membrane sheet, drying temperature 25-65 °C; (12) Defatting and sintering: room temperature-first temperature stage: controlling the heating rate 0.1-0.6 °C / min, first temperature 900 °C, holding for 1-3 h; first temperature-highest temperature stage: heating rate 0.8-4 °C / min, highest temperature range 920-1080 °C, highest temperature holding for 0.5-3 h; The fuel electrode support body (100) is formed by stacking, isostatic pressing and sintering of each layer structure green body, and each single cell support body is adjusted in thermal expansion coefficient and gradually adapted to the thermal expansion coefficient of electrolyte in thickness direction to achieve single cell flatness.

11. The method of claim 10, wherein In step (1), the electrolyte powder is doped zirconia, the organic solvent is at least two of anhydrous ethanol, toluene, xylene, isopropyl alcohol, acetone, butanone and ethylene glycol monobutyl ether, and the additive is at least one of polyvinyl butyral, polyvinyl alcohol, acrylic resin, ethyl cellulose, methyl cellulose, dibutyl phthalate and fish oil.

12. The method of claim 10, wherein In step (2), the fuel electrode functional layer (200) powder is one of doped zirconia and doped cerium oxide, and at least one of nickel oxide and copper oxide, the organic solvent is at least two of anhydrous ethanol, toluene, xylene, isopropyl alcohol, acetone, butanone and ethylene glycol monobutyl ether, and the additive is at least one of polyvinyl butyral, polyvinyl alcohol, acrylic resin, ethyl cellulose and methyl cellulose, dibutyl phthalate and fish oil.

13. The method of claim 10, wherein said In step (3), the fuel electrode support body (100) one-part (101) layer powder is doped zirconia, nickel oxide, pore-forming agent and thermal expansion coefficient adjusting phase, the pore-forming agent is one of graphite, carbon powder, polymethyl methacrylate and starch, the pore-forming agent is added in an amount of 6-14% of the weight of the one-part layer powder, the thermal expansion coefficient adjusting phase is at least one of yttrium oxide, calcium oxide, copper oxide, aluminum oxide, magnesium oxide, iron oxide, aluminum titanate and silicon carbide, the organic solvent is at least two of anhydrous ethanol, toluene, xylene, isopropyl alcohol, acetone, butanone and ethylene glycol monobutyl ether, and the additive is at least one of polyvinyl butyral, polyvinyl alcohol, acrylic resin, ethyl cellulose, methyl cellulose, dibutyl phthalate and fish oil.

14. The method of claim 10, wherein said In step (4), the fuel electrode support body (100) two-part to five-part (102-105) layer powder is doped zirconia, nickel oxide, pore-forming agent and thermal expansion coefficient adjusting phase, the pore-forming agent is one of graphite, carbon powder, polymethyl methacrylate and starch, the pore-forming agent is added in an amount of 6-14% of the weight of the two-part to five-part (102-105) layer powder, the thermal expansion coefficient adjusting phase is at least one of yttrium oxide, calcium oxide, copper oxide, aluminum oxide, magnesium oxide, iron oxide, aluminum titanate and silicon carbide, the organic solvent is at least two of anhydrous ethanol, toluene, xylene, isopropyl alcohol, acetone, butanone and ethylene glycol monobutyl ether, and the additive is at least one of polyvinyl butyral, polyvinyl alcohol, acrylic resin, ethyl cellulose, methyl cellulose, dibutyl phthalate and fish oil.

15. The method of claim 10, wherein said In step (9), the second electrolyte powder is nano-doped cerium oxide, the solvent used is at least one of methanol, ethanol, formic acid, ethyl acetate, butyl acetate and methoxy propanol, and the additive used is at least one of ethylene glycol, propylene glycol, polyvinyl alcohol and carboxymethyl propanol.

16. The method of claim 10, wherein said Step (11) air electrode functional powder is doped with cerium oxide, perovskite conductive material and pore forming agent, the perovskite conductive material is at least one of lanthanum strontium manganese, lanthanum strontium cobalt, lanthanum strontium cobalt iron, lanthanum nickel cobalt, the pore forming agent is one of graphite, carbon powder, polymethyl methacrylate and starch, the solvent used is at least one of ethanol, pinewood oil alcohol, dimethylbenzene, ethyl acetate, butyl acetate, butyl carbitol, the additive used is at least one of polyvinyl butyral, polyvinyl alcohol, acrylic resin, ethyl cellulose, methyl cellulose, dibutyl phthalate and fish oil.

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