JP2005339986A - Solid oxide fuel cell and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid oxide fuel cell capable of operating at a low temperature, and also of manufacturing at a low cost, and to provide a manufacturing method thereof. <P>SOLUTION: The solid oxide fuel cell comprises an electrolyte layer, a fuel electrode layer formed on one side of the electrolyte layer, and an air electrode layer formed on the other side of the electrolyte layer; wherein at least one of the insides of the fuel electrode layer and air electrode layer is formed by an aerosol deposition method by jetting the powder of a material to a lower layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a solid oxide fuel cell using a solid oxide as an electrolyte and a method for producing the same.

A solid oxide fuel cell (SOFC) using a solid oxide as an electrolyte has been studied for application in various fields as a fuel cell having the highest power generation efficiency. FIG. 4 is a diagram for explaining the principle of SOFC. As shown in FIG. 4, the SOFC is basically a single cell including an electrolyte layer 101 formed of a solid oxide, and an air electrode (cathode) layer 102 and a fuel electrode (anode) layer 103 formed at both ends thereof. It is formed as a unit. The air electrode layer 102 is formed of a cobaltite-based oxide or the like, and generates oxygen ions (O ²⁻ ) by ionizing oxygen (O ₂ ) contained in air supplied from the outside. On the other hand, the fuel electrode layer 103 is formed of zirconia-based oxide or the like, and includes hydrogen (H ₂ ) or methane (CH ₄ ), which is a fuel supplied from the outside, and oxygen ions that have passed through the electrolyte layer 101. By reacting, water (H ₂ O) or carbon dioxide (CO ₂ ) is generated and discharged. The electrons (e ⁻ ) emitted at that time are supplied to the air electrode layer 102 via the external circuit 104. In this way, power generation is performed, and electric power can be taken out by the external circuit 104.
A general SOFC has a structure in which a plurality of such single cells are stacked via an interconnector (separator) 105 formed of conductive ceramics or the like.

By the way, in SOFC, it is calculated | required that it has the high permeability | transmittance with respect to oxygen ion as a characteristic of an electrolyte layer, and gas permeability is few. Moreover, it is desirable that the interconnector has a low resistance value and a low gas permeability.
Therefore, Patent Documents 1 and 2 propose that an electrolyte layer and an interconnector of a solid oxide fuel cell are formed using an aerosol deposition (AD) method. Here, the aerosol refers to solid or liquid fine particles suspended in a gas. The AD method is a film forming method in which an aerosol containing raw material powder is generated, and the raw material powder is deposited by spraying it from a nozzle toward a substrate. Both the jet deposition method and the gas deposition method are used. being called. In the AD method, the raw material powder sprayed at a high speed collides with the lower layer such as the substrate or the previously formed deposit, and the crushing surface generated by crushing the powder at the time of the collision. Is formed by a mechanochemical reaction that adheres to the lower layer. By using such an AD method, a dense and strong film containing no impurities can be formed.

  Patent Document 1 discloses that a zirconia-based or ceria-based electrolyte layer is formed on the surface of a substrate by a gas deposition method, or a lanthanum chromite-based or titanium-based oxide on the surface of a substrate by a gas deposition method. A method for manufacturing a solid oxide fuel cell in which an interconnector layer is formed is disclosed. According to this manufacturing method, a low-resistance, homogeneous, and dense electrolyte layer and interconnector layer can be produced, so that an element such as a high-performance and low-cost SOFC cell can be provided.

  Patent Document 2 discloses a flat solid oxide fuel having a structure in which a cell composed of three layers of a fuel electrode, an electrolyte, and an air electrode and a separator for electrically connecting the cells are sequentially stacked. In the battery, the separator is a three-dimensional metal substrate having a plurality of protrusions that support the cell and form a ventilation space between the cell, and a conductive oxidation formed on the surface of the metal substrate by an aerosol deposition method. There is disclosed a flat plate solid oxide fuel cell comprising a material layer and causing movement of electrons between the cell and the metal substrate via the conductive oxide layer.

On the other hand, the characteristics of the air electrode and the fuel electrode in SOFC are required to have high gas permeability and a large reaction area (that is, an area where the permeated gas contacts).
In general, an SOFC is produced by forming a fuel electrode layer and an air electrode layer on an electrolyte layer as a base material by a green sheet method. However, in the layer formed by the green sheet method, the gas permeability is good because the porosity (ratio of the void portion existing in the structure) is large, but the grain size is also large (for example, 1 μm to 5 μm or more). ) The total surface area of the crystal grains is not so large. Further, in such a manufacturing method, a high-temperature process of 1000 ° C. or higher is required to vaporize the binder. Therefore, since only materials having high heat resistance such as ceramics can be used as the material for the interconnector, the material selection range is narrow and the cost of the material is high. Furthermore, during the high temperature process, reaction products are formed at the interface between the electrolyte layer and the fuel electrode layer or the air electrode layer, and crystal grains in the fuel electrode layer or the air electrode layer grow to further increase the grain size. End up. Therefore, it is difficult to make the performance of the fuel cell higher than the current state.

By the way, a general SOFC normally operates near 1000 ° C., but in recent years, attempts have been made to lower the operating temperature. According to Non-Patent Document 1, it is considered that there are the following merits by setting the operating temperature to 800 ° C. or lower, for example.
First, by lowering the operating temperature, a metal such as stainless steel can be used as the material of the interconnector, so that the range of material selection is widened and the cost can be reduced. Further, since the thermal deterioration of the constituent members is reduced, the reliability of the fuel cell can be increased and the life can be extended. In this regard, Non-Patent Document 2 describes that the corrosion rate for stainless steel is reduced to 1/14 by lowering the operating temperature from 900 ° C. to 700 ° C. (Non-Patent Document 2, page 75). Furthermore, since the heat resistance requirement for the entire system is relaxed, the cost of the equipment can be reduced. In addition, by setting the operating temperature to 600 ° C. or higher, it becomes possible to reform fuel such as methane into hydrogen inside the SOFC, and the system can be made compact and simplified.

However, when the operating temperature is lowered, the catalytic activity is lowered, so the power generation performance of the SOFC is also lowered. Therefore, it is difficult to maintain the same power generation performance as before while lowering the operating temperature.
JP 2000-58084 A (2nd page) JP 2003-272658 A (2nd page) Supervised by Shinya Honma, “All About Illustrated Fuel Cells”, Industrial Research Council, December 2003, p. 71-73 “Forefront of Fuel Cell Development, Nikkei Mechanical Supplement,” Nikkei BP Co., Ltd., June 2001, p. 74-78

  In view of the above, an object of the present invention is to provide a solid oxide fuel cell that can be manufactured at low cost and can be operated at a low temperature, and a method for manufacturing the same.

  In order to solve the above problems, a solid oxide fuel cell according to the present invention includes an electrolyte layer, a fuel electrode layer formed on one side of the electrolyte layer, and the other side of the electrolyte layer. And at least one of the fuel electrode layer and the air electrode layer is formed by an aerosol deposition method in which raw material powder is sprayed and deposited on the lower layer.

  The method for producing a solid oxide fuel cell according to the present invention includes an electrolyte layer, a fuel electrode layer formed on one side of the electrolyte layer, and air formed on the other side of the electrolyte layer. A method of manufacturing a solid oxide fuel cell including an electrode layer, the step of forming a fuel electrode layer (a), the step of arranging an electrolyte layer (b), and the step of forming an air electrode layer (c) And the step (a) or (c) includes forming a fuel electrode layer or an air electrode layer by an aerosol deposition method in which raw material powder is injected and deposited on the lower layer.

  According to the present invention, at least one of the air electrode layer and the fuel electrode layer is formed by an aerosol deposition method that does not require a high-temperature process. For this reason, for example, as in the case of inexpensive stainless steel, the range of material selection for the interconnect layer is widened, and the cost can be reduced. In addition, generation of reaction products due to high temperature processes and growth of crystal grains can be prevented, so that deterioration in SOFC performance can be suppressed. Further, by using a powder having a predetermined average particle size as a material in the aerosol deposition method, a porous layer having a small crystal grain size can be formed. Therefore, the air electrode layer and / or the fuel electrode can be formed. The reaction area in the layer can be increased. Therefore, even when the operating temperature is lowered, high power generation performance of SOFC can be maintained. Therefore, since the heat resistance requirement for the system including the SOFC is eased, the equipment cost can be reduced, the range of applications can be expanded, and the life of the SOFC can be extended.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. The same constituent elements are denoted by the same reference numerals, and the description thereof is omitted.
FIG. 1 is a cross-sectional view showing a configuration of a solid oxide fuel cell (SOFC) according to an embodiment of the present invention. The SOFC includes a single cell 1 including an electrolyte layer 10, an air electrode layer 11, and a fuel electrode layer 12, and an interconnect layer 2 disposed between two adjacent single cells 1 and a plurality of stacked layers. And current collector plates 3 arranged at both ends of the single cell 1. These parts 1 to 3 are housed in the housing 4.

The electrolyte layer 10 is made of a material mainly composed of zirconia-based oxide, ceria-based oxide, lanthanum gallate-based oxide (La (Sr) Ga (Mg ₁ Co) O ₃ ), etc. The oxygen ions (O ²⁻ ) supplied from 11 are permeated. The electrolyte layer 10 is a film having a thickness of about 10 μm. In order to improve the permeability of oxygen ions and suppress the permeability of gas, the average crystal grain size is smaller than that of the air electrode layer 11 and the fuel layer 12 described later. It is small and has a dense structure with a porosity of about 5% or less. Here, the porosity is a ratio of a void portion existing inside a structure such as ceramics, and is represented by porosity (%) = 100% −filling rate (%). The filling rate is the ratio of the volume actually occupied by the particles contained in the structure to the volume of the entire structure such as ceramics. Specific examples of the material for the electrolyte layer 10 include zirconia materials, ceria materials, and lanthanum gallate materials, yttrium oxide (Y ₂ O ₃ ), ytterbium oxide (Yb ₂ O ₃ ), and dysprosium oxide (Dy ₂ O). ₃ ), erbium oxide (Er ₂ O ₃ ), eurobium oxide (Eu ₂ O ₃ ), gadolinium oxide (Gd ₂ O ₃ ), holmium oxide (Ho ₂ O ₃ ), lutetium oxide (Lu ₂ O ₃ ), samarium oxide _(Sm 2 _O 3), obtained by adding at least one or more of thulium oxide _(Tm 2 _{O 3)} is used.

The air electrode layer 11 is made of a material mainly composed of cobaltite-based oxide (Sm (Sr) CoO ₃ ), manganite-based oxide, chromite-based oxide, and the like, and is contained in air supplied from the outside. generating oxygen ions ^{(O 2-)} by ionizing the oxygen _{(O 2)} to be. The air electrode layer 11 is a film having a thickness of about 30 μm, and has an average crystal grain size of about 1 μm in order to increase the reaction area (that is, the area in contact with the permeated gas) and improve air permeability. In the following, it preferably has a porous structure of about 500 nm or less, more preferably 300 nm or less, and a porosity of about 20% to 50%.

The fuel electrode layer 12 is formed of a material mainly composed of zirconia-based oxide, ceria-based oxide ((CeO ₂ ) _1-X (SmO _1.5 ) _X ), lanthanum gallate-based oxide, As a catalyst, about 30 to 50% by volume of nickel (Ni) is added. The fuel layer 12 reacts with hydrogen H ₂ or methane CH ₄ contained in the fuel supplied from the outside and oxygen ions O ²⁻ supplied from the electrolyte layer 10, thereby causing water (H ₂ O) or carbon dioxide to react. Carbon (CO ₂ ) is generated and discharged. The fuel electrode layer 12 is a film having a thickness of about 30 μm, and has an average crystal grain size of about 1 μm or less, preferably about 500 nm or less, more preferably, for increasing the reaction area and good fuel permeability. It has a porous structure of 300 nm or less and a porosity of about 20% to 50%.

The interconnect layer 2 is formed of conductive ceramics mainly composed of SUS (stainless steel), chromite oxide, titanium oxide, or the like. The interconnect layer 2 electrically connects adjacent single cells 1 and blocks reaction and gas leakage between adjacent layers. Further, in order to efficiently supply air and fuel to the air electrode layer 11 and the fuel electrode layer 12, respectively, it is desirable that the interconnect layer 2 be provided with a groove serving as a gas flow path. When the interconnect layer 2 is formed of ceramics, specifically, as a material, a lanthanum chromite-based material or a titanium-based material includes calcium oxide (CaO), strontium oxide (SrO), and magnesium oxide (MgO). What added at least 1 or more types is used.
The current collecting plate 3 collects electrons (e ⁻ ) from the fuel electrode layer 12 arranged at one end of the SOFC and guides them to the lead wire 6, and at the same time the air electrode layer 11 arranged at the other end of the SOFC. To supply electrons. Electric power is supplied to the external circuit 5 by such reactions in the respective units.

  Next, a method for manufacturing a ceramic structure according to this embodiment will be described. In the present embodiment, the electrolyte layer 10, the air electrode layer 11, and the fuel layer 12 are formed by an aerosol deposition (AD) method in which an aerosol containing raw material powder is deposited by spraying on a substrate.

FIG. 2 is a schematic diagram showing a film forming apparatus using the AD method. The film forming apparatus includes a gas cylinder 21, transfer pipes 22 a and 22 b, an aerosol generation chamber 23, a film formation chamber 24, an exhaust pump 25, a nozzle 26, and a substrate holder 27.
The gas cylinder 21 is filled with nitrogen (N ₂ ), oxygen (O ₂ ), helium (He), argon (Ar), dry air, or the like used as a carrier gas. The gas cylinder 21 is provided with a pressure adjusting unit 21a for adjusting the supply amount of the carrier gas. The aerosol generation chamber 23 is a container in which a fine powder of raw material that is a film forming material is placed. By introducing a carrier gas into the aerosol generation chamber 23 from the gas cylinder 21 via the transport pipe 22a, the raw material powder disposed there is blown up to generate the aerosol 110. The generated aerosol 110 is supplied to the nozzle 26 through the transport pipe 22b.

  The inside of the film forming chamber 24 is exhausted by an exhaust pump 25 and is maintained at a predetermined degree of vacuum. In the film forming chamber 24, a nozzle 26 for injecting the aerosol 110 and a substrate holder 27 for holding the substrate 120 on which the structure is formed are arranged. The substrate holder 27 is provided with a substrate holder driving unit 27a for moving the substrate holder 27 three-dimensionally, and thereby the relative position and relative speed between the nozzle 26 and the substrate 120 are controlled.

FIG. 3 is a diagram for explaining a process of manufacturing the SOFC shown in FIG.
First, a SUS substrate to be the interconnect layer 2 is prepared, and this is placed on the substrate holder 27 shown in FIG. 2 as the substrate 120, and the substrate 120 is kept at a predetermined film formation temperature. Next, the raw material powder of the fuel electrode layer 12 is placed in the aerosol generation chamber 23 shown in FIG. Then, as shown in FIG. 3A, the fuel electrode layer 12 is formed on the interconnect layer 2 (substrate 120) by injecting an aerosol containing raw material powder from the nozzle 26 toward the substrate. Next, the raw material powder of the electrolyte layer 10 is placed in the aerosol generation chamber 23, and the electrolyte layer 10 is formed on the fuel electrode layer 12 as shown in FIG. Furthermore, the powder of the raw material of the air electrode layer 11 is arrange | positioned in the aerosol production | generation chamber 23, and the air electrode layer 11 is formed on the electrolyte layer 10, as shown in FIG.3 (c). In this way, the single cell 1 is formed on the interconnect layer 2.

  Further, as shown in FIG. 3 (d), the SOFC shown in FIG. 1 is manufactured by stacking a plurality of single cells 1 via the interconnect layer 2 and disposing the current collector plates 3 at both ends. Can do.

Here, in the present embodiment, the dense electrolyte layer 10, the porous air electrode layer 11 and the fuel electrode layer 12 are both formed by the AD method. Therefore, a method and principle of forming films having different porosity using the AD method will be described in detail.
In the AD method, it is known that there are differences in film quality, deposition rate, and the like of the formed film due to various conditions regarding the powder sprayed from the nozzle. For example, the raw material powder (primary particles) placed in the aerosol generating container aggregates over time to form secondary aggregated particles due to electrostatic force, van der Waals force, or moisture cross-linking effect. Resulting in. Even if such secondary agglomerated particles collide with the substrate, the kinetic energy possessed by the secondary agglomerated particles is used for crushing itself, so it does not form a crushing surface, and therefore adheres to the lower layer. do not do. For this reason, the secondary agglomerated particles cannot contribute to the film formation, and in some cases, the previously formed deposit is blasted. Moreover, even if the powder to be sprayed is primary particles, it is empirically known that there exists an average particle diameter range suitable for film formation.

  Therefore, the inventor of the present application paid attention to the average particle diameter of the raw material powder and examined the relationship between the average particle diameter and the quality of the AD film. First, the inventor of the present application changes the average particle diameter of PZT (lead zirconate titanate) powder, which is one of ceramic materials, in the range of 0.2 μm to 0.3 μm. Films (AD films) were formed using the film forming apparatus shown in FIG. 2, and the surface of each AD film was observed and the hardness was measured. As a result, it was found that there is a certain relationship between the average particle diameter of the raw material powder and the film quality of the AD film.

  First, when the surface of the formed AD film was observed using an SEM (scanning electron microscope), the larger the average particle diameter of the raw material PZT powder, the smaller the average crystal grain diameter in the AD film, and the porosity was It was low. Conversely, the smaller the average particle size of the raw material PZT powder, the larger the average crystal particle size in the AD film, and the higher the porosity. Further, the larger the average particle diameter of the raw material PZT powder, the larger the Vickers hardness of the AD film, and the smaller the average particle diameter of the raw material PZT powder, the smaller the Vickers hardness of the AD film.

  Such observation results are considered to be caused by the following mechanism. That is, the primary particles having a large particle diameter have a large kinetic energy when ejected from the nozzle, and thus are easily crushed when they collide with the substrate. For this reason, the fragmented primary particles are bonded to each other by a mechanochemical reaction, so that a dense and strong AD film is formed. On the other hand, primary particles having a small particle diameter have a small kinetic energy, so that even if they collide with the substrate, they are not easily crushed. Even if such primary particles collide with the substrate, they are only trapped and deposited in the lower layer, so that a porous film with a high porosity is obtained. Therefore, by adjusting the average particle diameter of the raw material powder, it becomes possible to control the average crystal particle diameter, porosity, etc. of the AD film.

  Therefore, in the present embodiment, the electrolyte layer 10 is formed using a raw material powder having an average particle diameter of about 0.3 μm to 1.0 μm, and the average particle diameter is smaller than 0.05 μm to 0.00. The air electrode layer 11 and the fuel electrode layer 12 are formed using a raw material powder of about 2 μm. Thereby, both the dense electrolyte layer 10 and the porous air electrode layer 11 and the fuel electrode layer 12 can be formed by the AD method. Since the air electrode layer 11 and the fuel electrode 12 formed in this way are porous and have a small average crystal grain size, the reaction area in contact with the inflowing air or fuel gas can be widened. In addition, when these layers are formed using the screen printing method, the average crystal grain size becomes 10 times or more larger than when the AD method is used. Therefore, it is possible to determine which film forming method was used by observing the film.

  Here, in order to adjust the average particle diameter of the raw material powder, as one method, two or more kinds of fine powders having different particle diameter distribution center values may be mixed. For example, a desired average is obtained by mixing fine powder having a particle diameter distribution center value of 0.1 μm to 0.5 μm and fine powder having a particle diameter distribution center value of 0.2 μm to 0.6 μm at a predetermined ratio. A powder having a particle size can be obtained. The range of the average particle diameter of the powder that can be used as the raw material for the AD method and the correspondence relationship between the average particle diameter and the porosity are considered to differ depending on the type of raw material used. Therefore, it is desirable to measure the corresponding relationship in advance according to the type of raw material used.

  Thus, in this embodiment, since the electrolyte layer 10, the air electrode layer 11, and the fuel electrode layer 12 are formed by the AD method, a high-temperature process after film formation is unnecessary. That is, sintering at around 1000 ° C. that is generally performed in screen printing is not necessary, and even when annealing is performed, about 600 ° C. to 800 ° C. is sufficient. Therefore, the range of selection of the substrate material is widened, and an inexpensive SUS substrate or the like can be used, so that the manufacturing cost can be reduced. Furthermore, in the AD method, a film having a small crystal grain size can be formed, and the crystal grain size does not grow in subsequent processes. Therefore, the reaction area in the air electrode layer 11 and the fuel electrode layer 12 can be increased, and the power generation efficiency can be improved. Further, the catalyst (nickel fine particles) mixed in the fuel electrode layer 12 can be highly dispersed. Furthermore, since the thickness of the electrolyte layer 10 can be reduced while maintaining the denseness, the conductivity can be increased. Thereby, even when the operating temperature of the SOFC is lowered, high power generation performance can be maintained.

  In the embodiment of the present invention described above, a single cell is formed on the SUS substrate by film formation by the AD method. However, an AD method is used by using a conductive ceramic substrate instead of the SUS substrate as an interconnect layer. May be performed. Alternatively, a single cell may be formed on the dummy substrate by the AD method, and after the dummy substrate is removed, SUS or conductive ceramics serving as an interconnect layer may be disposed. Further, the interconnect layer may be formed by the AD method. In that case, in order to form a dense and highly hard interconnect layer, the raw material is mainly composed of chromite oxide, titanium oxide, etc., and the average particle size is about 0.3 μm to about 1.0 μm. It is desirable to use this powder. In this case, since all the layers can be formed by the AD method, the manufacturing process and the manufacturing apparatus can be simplified and the cost can be reduced.

  In this embodiment, the fuel electrode layer, the electrolyte layer, and the air electrode layer are sequentially formed on the SUS substrate by the AD method. On the contrary, the air electrode layer, the electrolyte layer, and the fuel electrode layer are formed in this order. It doesn't matter. Further, as the electrolyte layer, a ceramic plate material or the like may be used as in the conventional solid oxide fuel cell. In that case, the fuel electrode layer and the air electrode layer may be formed by performing the AD method using the electrolyte layer as a substrate.

  The present invention can be used in a solid oxide fuel cell.

It is a figure which shows the structure of the solid oxide fuel cell which concerns on one Embodiment of this invention. It is a schematic diagram which shows the film-forming apparatus by AD method. It is a figure for demonstrating the manufacturing process of the solid oxide fuel cell shown in FIG. It is a figure for demonstrating the principle of a solid oxide fuel cell.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Single cell 2, 105 Interconnect layer 3 Current collecting plate 4 Case 5, 104 External circuit 6 Lead wire 10, 101 Electrolyte layer 11, 102 Air electrode layer 12, 103 Fuel electrode layer 21 Gas cylinder 21a Pressure adjustment part 22a, 22b Tube 23 Aerosol generation chamber 24 Film formation chamber 25 Exhaust pump 26 Nozzle 27 Substrate holder 27a Substrate holder driving unit 110 Aerosol 120 Substrate

Claims (10)

An electrolyte layer;
A fuel electrode layer formed on one side of the electrolyte layer;
An air electrode layer formed on the other side of the electrolyte layer;
Comprising
A solid oxide fuel cell, wherein at least one of the fuel electrode layer and the air electrode layer is formed using an aerosol deposition method in which raw material powder is injected and deposited on a lower layer.   The solid oxide fuel cell according to claim 1, wherein an average crystal grain size in the fuel electrode layer or the air electrode layer formed by using an aerosol deposition method is 500 nm or less. Each further includes an interconnect layer that includes the fuel electrode layer, the electrolyte layer, and the air electrode layer, and electrically connects a plurality of adjacent single cells,
The interconnect layer is formed of stainless steel;
The solid oxide fuel cell according to claim 1 or 2.   The solid oxide fuel cell according to any one of claims 1 to 3, wherein the fuel electrode layer contains a zirconia-based oxide, a ceria-based oxide, and a lanthanum gallate-based oxide as a main component.   The solid oxide fuel cell according to claim 4, wherein the fuel electrode layer contains 30% by volume to 50% by volume of nickel (Ni) particles.   The solid oxide fuel cell according to any one of claims 1 to 5, wherein the air electrode layer contains a cobaltite-based oxide, a manganite-based oxide, and a chromite-based oxide as a main component. A method for producing a solid oxide fuel cell comprising an electrolyte layer, a fuel electrode layer formed on one side of the electrolyte layer, and an air electrode layer formed on the other side of the electrolyte layer. And
Forming a fuel electrode layer (a);
A step (b) of disposing an electrolyte layer;
A step (c) of forming an air electrode layer;
Comprising
The solid oxide fuel cell, wherein the step (a) or (c) includes forming the fuel electrode layer or the air electrode layer by an aerosol deposition method in which a raw material powder is injected and deposited on the lower layer. Manufacturing method. A step of disposing an interconnect layer that electrically connects a plurality of adjacent single cells including the fuel electrode layer, the electrolyte layer, and the air electrode layer;
8. The method of manufacturing a solid oxide fuel cell according to claim 7, wherein the step (a) or (c) includes injecting and depositing raw material powder toward the stainless steel used as the interconnect layer.   The method of manufacturing a solid oxide fuel cell according to claim 7 or 8, wherein the step (b) includes forming the electrolyte layer by spraying and depositing raw material powder on the lower layer.   The solid oxide fuel according to claim 9, wherein an average particle size of the raw material powder used in the step (a) or (c) is smaller than an average particle size of the raw material powder used in the step (b). Battery manufacturing method.

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