KR20200049114A - Method for manufacturing a solid oxide fuel cell - Google Patents

Abstract

The present invention relates to a manufacturing method of a solid oxide fuel cell, comprising the following steps: manufacturing an anode support layer by a tape casting method; preparing an anode active layer by the tape casting method; preparing an electrolyte layer by the tape casting method; sequentially stacking the prepared anode support layer, anode active layer, and electrolyte layer to form a laminate; and simultaneously firing the laminate. The step of preparing the electrolyte layer by the tape casting method can further include a step of forming a cathode diffusion barrier layer by a spray coating method on the electrolyte layer.

Description

Manufacturing method of solid oxide fuel cell {METHOD FOR MANUFACTURING A SOLID OXIDE FUEL CELL}

The present specification relates to a method for manufacturing a solid oxide fuel cell.

Recently, as the existing energy resources such as petroleum are depleted, interest in alternative energy that can replace them is increasing, and fuel cells are attracting attention as one of these alternative energy sources. In the case of a fuel cell, research has been actively conducted due to its high efficiency, a wide range of applications because it can be manufactured in various sizes, and has no dependence on fossil fuels and petroleum fuels, so that no pollutants are emitted from the fuel.

In general, the unit cell of a fuel cell forms an anode and an anode on both sides of the electrolyte, respectively, so that the anode consists of an anode, and the cathode consists of a cathode. It is released through, and when oxygen is supplied to the cathode, electrons are received from external circuits and reduced to oxygen ions. The reduced oxygen ions move to the anode through the electrolyte and react with the oxidized fuel to produce water.

Among these unit cells, a high capacity by connecting single cells of a solid oxide unit cell is referred to as a stack, and this is used as a solid oxide fuel cell (SOFC).

Meanwhile, the half cell used in the solid oxide fuel cell includes an anode support layer, an anode active layer, an electrolyte layer, and a cathode diffusion barrier layer, wherein the cathode diffusion barrier layer prevents the doped YSZ from diffusing into the electrolyte layer. Used and laminated on the electrolyte layer. At this time, in the process of laminating and firing each layer, a problem such as layer separation occurs due to a difference in the plastic shrinkage rate.

Republic of Korea Patent Publication No. 10-2013-0137795

The present specification relates to a method for manufacturing a solid oxide fuel cell.

An exemplary embodiment of the present specification is a step of manufacturing an anode support layer by a tape casting method; Preparing an anode active layer by a tape casting method; Preparing an electrolyte layer by a tape casting method; Sequentially stacking the prepared anode support layer, anode active layer, and electrolyte layer to form a laminate; And co-firing the laminate, and preparing the electrolyte layer by the tape casting method further comprises forming a cathode diffusion barrier layer by spray coating on the electrolyte layer. It provides a method for manufacturing a fuel cell.

In addition, an exemplary embodiment of the present specification provides a solid oxide fuel cell manufactured according to the above-described method for manufacturing a solid oxide fuel cell.

The method of manufacturing the solid oxide fuel cell of the present specification not only shortens the process time by manufacturing the electrolyte layer and the cathode diffusion barrier layer formed on the electrolyte layer in a continuous process, but also short circuits due to the difference in the plastic shrinkage between the two layers. This phenomenon can be alleviated.

1 is according to an embodiment It is a drawing showing the manufacturing process of a solid oxide fuel cell.
2 is a view showing a process of forming the cathode diffusion barrier layer by a spray coating method continuously after preparing an electrolyte layer by a tape casting method in a process of manufacturing a solid oxide fuel cell according to an embodiment.
3 is a view showing a manufacturing process of a solid oxide fuel cell according to a comparative example.
4 is a photograph taken from the top surface of the electrolyte layer provided with the cathode diffusion barrier layer of the solid oxide fuel cell prepared according to the embodiment.
FIG. 5 is a photograph taken from the top surface of the electrolyte layer provided with the cathode diffusion barrier layer of the solid oxide fuel cell prepared according to the comparative example.
6 is a view schematically showing the structure of a battery module including a solid oxide fuel cell.

Hereinafter, the present specification will be described in more detail.

In this specification, "phase" does not only mean that it is physically placed on one layer, but that it is located on a location. That is, a layer located on one layer may have another layer therebetween.

In the present specification, when a part “includes” a certain component, it means that the component may further include other components, not to exclude other components, unless specifically stated otherwise.

An exemplary embodiment of the present specification is a step of manufacturing an anode support layer by a tape casting method; Preparing an anode active layer by a tape casting method; Preparing an electrolyte layer by a tape casting method; Sequentially stacking the prepared anode support layer, anode active layer, and electrolyte layer to form a laminate; And co-firing the laminate, and manufacturing the electrolyte layer by the tape casting method may further include forming a cathode diffusion barrier layer by spray coating on the electrolyte layer.

In one embodiment of the present specification, the step of manufacturing the electrolyte layer by the tape casting method and the step of forming the cathode diffusion barrier layer by the spray coating method on the electrolyte layer may be performed in a continuous process.

Conventionally, the anode support layer, the anode active layer, the electrolyte layer, and the cathode diffusion barrier layer are tape-casted and stacked, and then fired, or the anode support layer and the anode active layer are stacked and fired, followed by screen printing and drying the electrolyte layer thereon, followed by drying. The cathode diffusion barrier layer was manufactured by a screen printing process and then fired to produce a multi-layered half-cell, but problems such as layer separation occurred in the sintering process due to an increase in the total process time or a characteristic difference in sintering shrinkage for each layer. Occurred.

Accordingly, the present inventor performs a step of forming an electrolyte layer by the tape casting method and a step of forming a cathode diffusion barrier layer by a spray coating method on the electrolyte layer, thereby not only shortening the process time but also electrolyte It has been found that the density of the layers can be increased and the phenomenon of short-circuiting due to the difference in the plastic shrinkage between the two layers can be alleviated.

In FIG. 2, in the method of manufacturing a solid oxide fuel cell according to the present invention, the process of forming the electrolyte layer and the cathode diffusion barrier layer in a continuous process is shown.

In one embodiment of the present specification, the step of manufacturing the anode support layer may be manufactured by a tape casting method.

Specifically, the step of preparing the anode support layer includes a process of coating the slurry for the anode support layer on a release film using a doctor blade, drying, and then peeling the release film, wherein the drying is performed at 50 ° C to 120 ° C. It may be carried out in less than 10 minutes.

At this time, the type of the release film used is not particularly limited, but preferably a polyethylene terephthalate film may be used.

In one embodiment of the present specification, the anode support layer has a higher porosity and a relatively thicker thickness than the anode active layer, which will be described later, and serves to support another layer, and may have excellent electrical conductivity, and may be positioned below the anode active layer. have.

In one embodiment of the present specification, the anode support layer may be manufactured using a slurry for the anode support layer.

The anode support layer slurry is prepared by ball milling, includes a zirconia-based metal oxide, and may include at least one of yttria stabilized zirconium oxide (YSZ) and scandia stabilized zirconium oxide (ScSZ). have. Specifically, the slurry for the anode support layer was yttria stabilized zirconium oxide (YSZ: (Y ₂ O ₃ ) _x (ZrO ₂ ) _1-x , x = 0.05 to 0.15) and scandia stabilized zirconium oxide ( ScSZ: (Sc ₂ O ₃ ) _x (ZrO ₂ ) _1-x , x = 0.05 ~ 0.15). More specifically, the slurry for the anode support layer may include yttria stabilized zirconium oxide (YSZ: (Y ₂ O ₃ ) _x (ZrO ₂ ) _1-x , x = 0.05 to 0.15). .

In one embodiment of the present specification, the anode support layer slurry may further include NiO. The NiO is reduced to Ni by the fuel supplied after the battery is fastened and serves as an electron conductive material.

In one embodiment of the present specification, the anode support layer slurry may include a complex of yttria stabilized zirconium oxide (YSZ) and NiO.

The content of NiO may be 80 wt% or more and 200 wt% or less of the weight of the zirconia-based metal oxide.

The anode support layer slurry may further include at least one of a pore-forming agent, a binder resin, a plasticizer, a dispersing agent, and a solvent, if necessary, and the binder resin, a plasticizer, a dispersing agent, and a solvent are not particularly limited. Known conventional materials can be used.

Based on the total weight of the slurry for the anode support layer, the content of the solvent is 20% to 40% by weight, the content of the dispersant is 5% to 10% by weight, the content of the plasticizer is 0.5% to 3% by weight, The content of the binder may be 5% to 20% by weight.

In one embodiment of the present specification, the average thickness of the anode support layer may be 10 μm or more and 1000 μm or less. Specifically, the average thickness of the anode support layer may be 50 μm or more and 800 μm or less, and more specifically, the average thickness of the anode support layer may be 50 μm or more and 500 μm or less.

In one embodiment of the present specification, the porosity of the anode support layer may be 10% or more and 50% or less. Specifically, the porosity of the anode support layer may be 10% or more and 30% or less.

In one embodiment of the present specification, the average diameter of the pores of the anode support layer may be 0.1 μm or more and 10 μm or less. Specifically, the average diameter of the pores of the anode support layer may be 0.5 μm or more and 5 μm or less.

In one embodiment of the present specification, the step of manufacturing the anode active layer may be manufactured by a tape casting method.

Specifically, the step of preparing the anode active layer includes a process of coating the slurry for the anode active layer on a release film using a doctor blade, drying, and peeling the release film, wherein the drying is 50 ° C to 120 ° C. It may be performed in less than 10 minutes.

At this time, the type of the release film used is not particularly limited, but preferably a polyethylene terephthalate film may be used.

In one embodiment of the present specification, the anode active layer is combined with oxygen ions received through the electrolyte layer and hydrogen ions supplied from the fuel, and is electrochemically oxidized to release electrons and generate water. The anode active layer may be positioned between the above-described anode support layer and the electrolyte layer, which will be described later, to perform a main role as an actual anode.

In one embodiment of the present specification, the anode active layer is prepared using a slurry for the anode active layer, and may be provided on the anode support layer.

The anode active layer slurry is prepared by ball milling and includes a zirconia-based metal oxide, and may include at least one of yttria stabilized zirconium oxide (YSZ) and scandia stabilized zirconium oxide (ScSZ). . Specifically, the slurry for the anode active layer is yttria stabilized zirconium oxide (YSZ: (Y ₂ O ₃ ) _x (ZrO ₂ ) _1-x , x = 0.05 ~ 0.15) and scandia stabilized zirconium oxide ( ScSZ: (Sc ₂ O ₃ ) _x (ZrO ₂ ) _1-x , x = 0.05 ~ 0.15). More specifically, the slurry for the anode active layer may include yttria stabilized zirconium oxide (YSZ: (Y ₂ O ₃ ) _x (ZrO ₂ ) _1-x , x = 0.05 to 0.15). .

In one embodiment of the present specification, the anode active layer slurry may further include NiO. The NiO is reduced to Ni by the fuel supplied after the battery is fastened and serves as an electron conductive material.

In one embodiment of the present specification, the anode active layer slurry may include a complex of yttria stabilized zirconium oxide (YSZ) and NiO.

The content of NiO may be 100 wt% or more and 200 wt% or less of the weight of the zirconia-based metal oxide.

The anode active layer slurry may further include at least one of a pore-forming agent, a binder resin, a plasticizer, a dispersing agent, and a solvent, if necessary, and the binder resin, a plasticizer, a dispersing agent, and a solvent are not particularly limited. Known conventional materials can be used.

Based on the total weight of the slurry for the anode active layer, the content of the solvent is 20% to 40% by weight, the content of the dispersant is 5% to 10% by weight, the content of the plasticizer is 0.5% to 3% by weight, The content of the binder may be 5% to 20% by weight.

In one embodiment of the present specification, the average thickness of the anode active layer may be 1 μm or more and 100 μm or less. Specifically, the average thickness of the anode active layer may be 5 μm or more and 70 μm or less.

In one embodiment of the present specification, the porosity of the anode active layer may be 10% or more and 50% or less. Specifically, the porosity of the anode active layer may be 10% or more and 30% or less.

In one embodiment of the present specification, the average diameter of the pores of the anode active layer may be 0.1 μm or more and 10 μm or less. Specifically, the average diameter of the pores of the anode active layer may be 0.5 μm or more and 5 μm or less.

In one embodiment of the present specification, the step of manufacturing the electrolyte layer may be manufactured by a tape casting method.

Specifically, the step of manufacturing the electrolyte layer by the tape casting method includes coating the slurry for the electrolyte layer on a release film using a doctor blade, drying it, and then peeling the release film, wherein the drying is 50 ° C. It may be performed at 120 ° C. or less for 10 minutes.

At this time, the type of the release film used is not particularly limited, but preferably a polyethylene terephthalate film may be used.

In one embodiment of the present specification, the electrolyte layer is prepared using a slurry for an electrolyte layer, and may be provided on the anode active layer.

The slurry for the electrolyte layer may include a material prepared by ball milling, having high stability in an oxidation and reduction atmosphere, and having high ion conductivity and low electron conductivity, such as an oxygen ion conductive inorganic substance.

Specifically, the oxygen ion-conducting inorganic material may include a complex metal oxide including at least one selected from the group consisting of zirconium oxide-based, cerium oxide-based, lanthanum-based, titanium oxide-based, and bismuth-oxide-based materials. More specifically, the oxygen ion conductive inorganic material of the electrolyte layer is yttria stabilized zirconium oxide (YSZ: (Y ₂ O ₃ ) _x (ZrO ₂ ) _1-x , x = 0.05 to 0.15), Scandia Stabilized zirconium oxide (ScSZ: (Sc ₂ O ₃ ) _x (ZrO ₂ ) _1-x , x = 0.05 ~ 0.15), samarium dop ceria (SDC: (Sm ₂ O ₃ ) _x (CeO ₂ ) _{1- x} , x = 0.02 ~ 0.4) and gadolinium dope ceria (GDC: (Gd ₂ O ₃ ) _x (CeO ₂ ) _1-x , x = 0.02 ~ 0.4), and may include at least one, preferably May include YSZ.

The slurry for the electrolyte layer may further include at least one of a pore former, a binder resin, a plasticizer, a dispersant, and a solvent, if necessary, and the binder resin, plasticizer, dispersant, and solvent are not particularly limited, and are known in the art. Conventional materials can be used.

Based on the total weight of the slurry for the electrolyte layer, the content of the inorganic particles having oxygen ion conductivity may be 40% to 70% by weight.

Based on the total weight of the slurry for the electrolyte layer, the content of the solvent is 20% to 40% by weight, the content of the dispersant is 5% to 10% by weight, the content of the plasticizer is 0.5% to 3% by weight, and the binder The content of may be 5% by weight to 20% by weight.

In one embodiment of the present specification, the thickness of the electrolyte layer may be 3 μm or more and 50 μm or less. Specifically, the thickness of the electrolyte layer may be 3 μm or more and 20 μm or less.

When the above thickness is satisfied, it is easy for oxygen ions to pass and thus it is possible to prevent a decrease in power generation capacity.

In one embodiment of the present specification, the cathode diffusion barrier layer may be formed by spray coating the composition for the cathode diffusion barrier layer on the electrolyte layer.

The forming of the cathode diffusion barrier layer by the spray coating method includes a process of coating and drying the composition for the cathode diffusion barrier layer on the electrolyte layer, wherein the drying is performed at 50 ° C to 120 ° C for 10 minutes or less. May be

At this time, the composition for the cathode diffusion barrier layer may be manufactured by ball milling and include GDC (Gd-doped ceria) or SDC (samaria-doped ceria), and preferably include GDC (Gd-doped ceria). Can be.

In one embodiment of the present specification, the composition for the cathode diffusion barrier layer may further include at least one of a pore former, a binder resin, a plasticizer, a dispersant, and a solvent, and the binder resin, a plasticizer, a dispersant, and a solvent are particularly limited. It does not do so, and conventional materials known in the art can be used.

In one embodiment of the present specification, based on the total weight of the composition for the cathode diffusion barrier layer, the content of the GDC (Gd-doped ceria) is 40% by weight or more and 70% by weight or less, and the content of the solvent is 20% by weight More than 40% by weight, the content of the dispersant is 5% by weight or more and 10% by weight or less, the content of the plasticizer is 3% by weight or less, and the content of the binder resin may be 3% by weight or more and 20% by weight or less.

In one embodiment of the present specification, the thickness of the cathode diffusion barrier layer may be 1 μm or more and 30 μm or less. Specifically, the thickness of the cathode diffusion barrier layer may be 1 μm or more and 15 μm or less.

When the above range is satisfied, it is possible to effectively prevent the material in the cathode from diffusing into the electrolyte layer.

In an exemplary embodiment of the present specification, the step of sequentially stacking the prepared anode support layer, the anode active layer, and the electrolyte layer to form a laminate includes an electrolyte layer having the prepared anode support layer, anode active layer, and cathode diffusion barrier layer. It may be to sequentially stack to form a laminate.

At this time, the laminate may have a structure of an anode support layer / anode active layer / electrolyte layer / cathode diffusion barrier layer.

In an exemplary embodiment of the present specification, the step of simultaneously firing the laminate means simultaneously firing each layer of the laminate in one firing process.

In one embodiment of the present specification, the simultaneous firing may be a firing at 1300 ° C to 1500 ° C.

When the co-fired temperature is higher than 1500 ° C, the density of the electrolyte layer becomes too high as the laminate is completely sintered, resulting in poor fuel efficiency, and if it is less than 1300 ° C, sintering of the laminate is not completely performed, so When the strength of the sieve is lowered and the stack is manufactured, the laminate may be broken, and the density of the electrolyte layer may be lowered, and fuel efficiency may decrease.

The present specification provides a solid oxide fuel cell manufactured according to the above-described method for manufacturing a solid oxide fuel cell.

In one embodiment of the present specification, the solid oxide fuel cell may further include a cathode provided on the electrolyte layer.

The cathode may include an inorganic material having oxygen ion conductivity to be applied to an anode for a solid oxide fuel cell. The type of the inorganic material is not particularly limited, but the inorganic material is yttria stabilized zirconium oxide (YSZ: (Y ₂ O ₃ ) _x (ZrO ₂ ) _1-x , x = 0.05 to 0.15), Scandia Stabilized zirconium oxide (ScSZ: (Sc ₂ O ₃ ) _x (ZrO ₂ ) _1-x , x = 0.05 ~ 0.15), samarium dop ceria (SDC: (Sm ₂ O ₃ ) _x (CeO ₂ ) _{1- x} , x = 0.02 ~ 0.4), gadolinium dope ceria (GDC: (Gd ₂ O ₃ ) _x (CeO ₂ ) _1-x , x = 0.02 ~ 0.4), lanthanum strontium manganese oxide: LSM), Lanthanum strontium cobalt ferrite (LSCF), Lanthanum strontium nickel ferrite (LSNF), Lanthanum calcium nickel ferrite (LCNF), Lanthanum strontium cobalt oxide (Lanthanum cobalt oxide) oxide: LSC, Gadolinium strontium cobalt oxide (GSC), Lanthanum Strontium Ferrite (Lanthanum At least one of strontium ferrite (LSF), Samarium strontium cobalt oxide (SSC), Barium Strontium cobalt ferrite (BSCF) and Lanthanum strontium gallium magnesium oxide (LSGM) It may include.

The cathode is Lanthanum strontium manganese oxide (LSM), Lanthanum strontium cobalt ferrite (LSCF), Lanthanum strontium nickel ferrite (LSNF), Lanthanum strontium nickel ferrite (LSNF), Lanthanum calcium nickel ferrite nickel (Lanthanum strontium nickel ferrite: LSNF) ferrite: LCNF), Lanthanum strontium cobalt oxide (LSC), Gadolinium strontium cobalt oxide (GSC), Lanthanum strontium ferrite (LSF), Samarium strontium ferrite (LSF), Samarium strontium cobalt oxide cobalt oxide (SSC), barium strontium cobalt ferrite (BSCF) and lanthanum strontium gallium magnesium oxide (Lanthanum strontium gallium magnesium oxide (LSGM)).

The cathode may include at least one of Lanthanum strontium cobalt ferrite (LSCF), Lanthanum strontium cobalt oxide (LSC) and Barium Strontium cobalt ferrite (BSCF).

The average thickness of the cathode may be 10 μm or more and 100 μm or less. Specifically, the average thickness of the cathode may be 20 μm or more and 50 μm or less.

The porosity of the cathode may be 10% or more and 50% or less. Specifically, the porosity of the cathode may be 10% or more and 30% or less.

The average pore diameter of the cathode may be 0.1 μm or more and 10 μm or less. Specifically, the average pore diameter of the cathode may be 0.5 μm or more and 5 μm or less. More specifically, the average diameter of the pores of the cathode may be 0.5 μm or more and 2 μm or less.

The method for manufacturing the cathode is not particularly limited, but, for example, the cathode slurry is directly coated on the electrolyte layer to dry and fire it, or the cathode slurry is coated on a separate release paper and dried to produce a cathode green sheet. Then, the cathode can be prepared by firing together with the green sheet of the adjacent layer.

The thickness of the green sheet for the cathode may be 10 μm or more and 100 μm or less.

The cathode slurry includes inorganic particles having oxygen ion conductivity, and if necessary, the cathode slurry may further include at least one of a binder resin, a plasticizer, a dispersant, and a solvent, and the binder resin, a plasticizer, a dispersant, and The solvent is not particularly limited, and conventional materials known in the art may be used.

Based on the total weight of the slurry for the cathode, the content of the inorganic particles having oxygen ion conductivity is 40% by weight or more and 70% by weight or less, the content of the solvent is 10% by weight or more and 30% by weight or less, and the content of the dispersant is 5% by weight or more and 10% by weight or less, the content of the plasticizer is 0.5% by weight or more and 3% by weight or less, and the content of the binder resin may be 10% by weight or more and 30% by weight or less.

The shape of the solid oxide fuel cell is not limited, and may be, for example, coin, flat, cylindrical, horn, button, sheet or stacked.

The solid oxide fuel cell may be specifically used in home / building and large-scale business power generation systems.

The present specification provides a battery module including a solid oxide fuel position as a unit cell.

6 schematically illustrates an embodiment of a battery module including a solid oxide fuel cell, and the solid oxide fuel cell includes a battery module 60, an oxidizing agent supply unit 70, and a fuel supply unit 80.

The battery module 60 includes one or two or more of the aforementioned solid oxide fuel cells as a unit cell, and when two or more unit cells are included, includes a separator interposed therebetween. The separator prevents the unit cells from being electrically connected and transfers fuel and oxidant supplied from the outside to the unit cell.

The oxidizing agent supply unit 70 serves to supply the oxidizing agent to the battery module 60. As the oxidizing agent, oxygen is typically used, and oxygen or air may be injected into the oxidizing agent supply unit 70 to be used.

The fuel supply unit 80 serves to supply fuel to the battery module 60, a fuel tank 81 for storing fuel, and a pump 82 for supplying fuel stored in the fuel tank 81 to the battery module 60 ). As the fuel, gas or liquid hydrogen or hydrocarbon fuel may be used. Examples of hydrocarbon fuels include methanol, ethanol, propanol, butanol or natural gas.

Hereinafter, examples will be described in detail to specifically describe the present specification. However, the embodiments according to the present specification may be modified in various other forms, and the scope of the present specification is not interpreted to be limited to the embodiments described below. The embodiments of the present specification are provided to more fully describe the present specification to those skilled in the art.

<Example>

1 is a flowchart of a method for manufacturing a solid oxide fuel cell according to an embodiment.

A slurry for an anode support layer including a powder, a dispersant, a binder, a plasticizer, and toluene composed of a complex of yttria stabilized zirconium oxide (zirconia) and NiO included in a weight ratio of 50:50 and a pore former was prepared. At this time, based on the total weight% of the slurry for the anode support layer, the content of the powder is 47% by weight, the content of the dispersant is 7% by weight, the content of the binder is 15% by weight, and the content of the plasticizer is 1% by weight. %, And the toluene content is 30% by weight. Based on 100 parts by weight of the powder, the content of the pore-forming agent is 10% by weight.

The slurry for the anode support layer was coated on a release film by a tape casting method using a doctor blade, dried, and then the release film was peeled to prepare an anode support layer having a thickness of 100 μm.

Except for using a complex of yttria stabilized zirconium oxide (zirconia) and NiO included in a weight ratio of 40:60, the same procedure as for the anode support layer described above was performed to prepare an anode active layer having a thickness of 50 μm.

As a powder, an yttria stabilized zirconium oxide (zirconia) powder was used, and the same procedure as in the above-described anode support layer manufacturing method was performed to prepare an electrolyte layer having a thickness of 10 μm, and was prepared in a continuous process. On the electrolyte layer, a composition for a cathode diffusion barrier layer containing GDC (Gd-doped ceria) powder, a dispersant, a binder, a plasticizer, and toluene was coated by a spray coating method to prepare a cathode diffusion barrier layer having a thickness of 5 μm.

The prepared anode support layer, the anode active layer, and the electrolyte layer having the cathode diffusion barrier layer were sequentially stacked to prepare a laminate.

The produced laminate was simultaneously fired at 1400 ° C to produce a half-cell for a solid oxide fuel cell.

<Comparative Example>

2 is a flowchart of a method for manufacturing a solid oxide fuel cell according to a comparative example.

In the step of manufacturing the laminate, the electrolyte layer and the cathode diffusion barrier layer were prepared and stacked, respectively, to proceed in the same manner as in the above-described embodiment to prepare a solid oxide fuel cell half battery.

<Experimental Example>

It was confirmed whether or not a short circuit occurred in the electrolyte layer provided with the cathode diffusion barrier layer by photographing the top surface of the electrolyte layer provided with the cathode diffusion barrier layer of the solid oxide fuel cell prepared in Examples and Comparative Examples. It is shown in.

According to FIG. 4, it was confirmed that the solid oxide fuel cell prepared in the example was made of a smooth surface having excellent density and no irregularities of the electrolyte layer provided with the cathode diffusion barrier layer, and thus no short circuit occurred.

According to FIG. 5, it was confirmed that the solid oxide fuel cell prepared in the comparative example had a layer separation phenomenon in the electrolyte layer provided with the cathode diffusion barrier layer, resulting in a short circuit.

60: battery module
70: oxidizing agent supply unit
80: fuel supply
81: fuel tank
82: Pump

Claims (11)

Preparing an anode support layer by a tape casting method;
Preparing an anode active layer by a tape casting method;
Preparing an electrolyte layer by a tape casting method;
Sequentially stacking the prepared anode support layer, anode active layer, and electrolyte layer to form a laminate; And
Comprising the step of simultaneously firing the laminate,
The step of manufacturing the electrolyte layer by the tape casting method further comprises forming a cathode diffusion barrier layer by spray coating on the electrolyte layer. The method according to claim 1,
The manufacturing method of the solid oxide fuel cell is a step of manufacturing an electrolyte layer by the tape casting method and forming a cathode diffusion barrier layer by a spray coating method on the electrolyte layer. The method according to claim 1,
The anode support layer is a yttria (yttria) stabilized zirconium oxide (zirconia) (YSZ) and a method of manufacturing a solid oxide fuel cell comprising a composite of NiO. The method according to claim 1,
The anode active layer is a yttria (yttria) stabilized zirconium oxide (zirconia) (YSZ) and a method of manufacturing a solid oxide fuel cell comprising a complex of NiO. The method according to claim 1,
The electrolyte layer is yttria (yttria) stabilized zirconium oxide (zirconia) (YSZ) method of manufacturing a solid oxide fuel cell. The method according to claim 1,
The cathode diffusion barrier layer is a method of manufacturing a solid oxide fuel cell comprising a GDC (Gd-doped ceria). The method according to claim 1,
The co-fired method of manufacturing a solid oxide fuel cell that is fired at 1300 ℃ to 1500 ℃. The method according to claim 1,
The method of manufacturing a solid oxide fuel cell having a thickness of the electrolyte layer is 1㎛ 30㎛. The method according to claim 1,
The cathode diffusion barrier layer is a method of manufacturing a solid oxide fuel cell having a thickness of 1㎛ to 30㎛. A solid oxide fuel cell manufactured according to the method for manufacturing a solid oxide fuel cell according to any one of claims 1 to 9. Battery module comprising a solid oxide fuel cell according to claim 10.

Images