KR101189159B1 - Sheets producting deviece and method for electrode of solid oxide fuel cell - Google Patents

Abstract

The present invention relates to a sheet manufacturing apparatus and a manufacturing method of an electrode for a solid oxide fuel cell, the transfer unit moving in one direction, and is mounted to be movable along the longitudinal direction of the transfer unit and disposed close to the upper side of the transfer unit And a dam applied to the transfer unit while discharging the slurry contained therein, and a sealed space in which the transfer unit and the dam are built is formed, and supports the movement of the transfer unit while guiding the movement of the dam. A drying chamber for heating and drying the slurry coated on the unit into an electrode sheet for a solid oxide fuel cell, and a separation piece for separating the electrode sheet conveyed by the transfer unit from the outlet of the drying chamber from the transfer unit. Using the apparatus comprising, apply the slurry to the upper side of the transfer unit to the same thickness and Forms a sheet, heats the electrode sheet in a drying chamber to remove moisture, passes through a separating piece to separate the electrode sheet from the transfer unit, and discharges the electrode sheet discharged from the drying chamber from the drying chamber. The method of high temperature sintering in an extended heat treatment chamber can be applied.

Description

Sheet manufacturing apparatus and manufacturing method of electrode for solid oxide fuel cell {SHEETS PRODUCTING DEVIECE AND METHOD FOR ELECTRODE OF SOLID OXIDE FUEL CELL}

The present invention relates to a sheet manufacturing apparatus and a manufacturing method of an electrode for a solid oxide fuel cell, and more particularly, to a solid oxide fuel cell that can produce a sheet of the solid oxide fuel cell electrode of a good quality in a uniform thickness quickly and in large quantities A sheet manufacturing apparatus and a manufacturing method of an electrode.

Fuel cells are not only used as next-generation power sources in that system efficiency is higher than existing internal combustion engines as countries develop and research alternative energy sources around the world suffering from oil shocks of the 20th century. This will reduce the air pollution and pollution caused by the item will be called.

Such fuel cells include fossil fuels such as methane and natural gas in addition to hydrogen, and liquid fuels such as methanol and hydrazine, among which the operating temperature is 300 ° C or lower. And more are classified as high temperature.

Among them, the operating temperature range of the solid oxide fuel cell is approximately 700 to 1,000 ° C., and it is known to operate at the highest temperature of the existing fuel cells. In comparison, the structure is simple, there is no fear of loss of the electrolyte, there are no problems such as replenishing the electrolyte, corrosion of the electrode, no precious metal catalyst, and easy fuel supply through internal reforming.

In the unit cell of the solid oxide fuel cell, a cathode, an electrolyte, and an anode are sequentially stacked, the electrode tabs are taken out from each electrode plate, and the stacked structure formed by stacking the cathode, the electrolyte, and the anode is subjected to high temperature and high pressure. It is wound up to produce an electrode assembly.

Thereafter, the electrode assembly is heat treated to complete a battery that is a conjugate of the electrode and the electrolyte.

In this case, the electrode is produced by forming a raw material in the form of a slurry in a large area sheet form, and although not shown in particular, the electrode through a variety of methods such as sintering after screen printing, deposition, spray coating (Plasma spray) method Will be produced.

However, the above-described method of sintering after screen printing is difficult to obtain a coating product of the same quality, since it is difficult to continuously perform screen attachment, coating, screen desorption, etc. when the slurry is coated, because of its characteristics, and when drying or heat treatment Severe cracking was sometimes caused by excessive shrinkage.

In addition, since the deposition method is a slow process and requires expensive equipment, there is a problem in that the cost competitiveness of the product is lowered due to higher production cost and manufacturing cost.

In addition, the thermal spray coating method is characterized in that the surface of the metal powder is melted or coated only part of the metal powder, because various defects such as splat interface, unmelted metal powder, cracks occur in at least one or more combinations to improve the electrical properties There was also a problem that was difficult to apply to the required product.

The present invention has been made to improve the above problems, and to provide a sheet manufacturing apparatus and a manufacturing method of an electrode for a solid oxide fuel cell to obtain a product of excellent quality in a uniform thickness.

In addition, the present invention is to provide a sheet manufacturing apparatus and method for manufacturing an electrode for a solid oxide fuel cell to perform a series of processes continuously and to minimize the occurrence of defects to achieve a rapid mass production.

In order to achieve the above object, the present invention provides a transfer unit moving in one direction, and is mounted to be movable along the longitudinal direction of the transfer unit and disposed close to the upper side of the transfer unit while discharging the slurry contained therein. A dam applied on the transfer unit, and a sealed space in which the transfer unit and the dam are built are formed, support the movement of the transfer unit while guiding the movement of the dam, and solidify the slurry applied on the transfer unit. A drying chamber which is heated and dried to change into an electrode sheet for an oxide fuel cell, and a separating piece separating the electrode sheet conveyed by the transfer unit from the transfer unit at an outlet side of the drying chamber, wherein the electrode sheet has a high temperature. Application of the embodiment to be sintered is possible.

In addition, the present invention is a vacuum degassing treatment and stabilized to discharge the slurry contained in the dam to apply the same thickness to the upper side of the transfer unit moving in one direction to form an electrode sheet, the transfer unit and the dam A second step of blocking the inflow of outside air in the drying chamber to be accommodated and heating the electrode sheet to remove moisture; and passing the electrode sheet through the separation piece disposed in line with the upper side of the transfer unit. It is also possible to apply a method comprising a third step of separating from the drying chamber and discharging from the drying chamber, and a fourth step of hot sintering the electrode sheet discharged from the drying chamber in a heat treatment chamber extending from the drying chamber. to be.

According to the present invention having the above-described configuration, the following effects can be achieved.

First, according to an embodiment in which a series of processes in which a slurry is applied to a certain thickness on a transfer unit moving in one direction, dried, separated, and then sintered at high temperature are applied, the process occurs in the unit electrode manufacturing process of the solid oxide fuel cell. It will be possible to minimize defects and obtain a good quality product.

In addition, the present invention allows the electrode sheet dried from the drying chamber to be directly sintered at high temperature without contacting the outside air, thereby minimizing defects and enabling rapid mass production, as well as facilitating identification of breakdown points. Do.

Therefore, using the manufacturing apparatus and manufacturing method according to various embodiments of the present invention can not only manufacture the components of the molten carbonate fuel cell, but also the electrode layer as well as the electrolyte can be formed in a constant and thin thickness, unit cell It is possible to prevent production defects and to produce fuel cells with good electrochemical properties.

1 is a conceptual diagram showing a sheet manufacturing apparatus of an electrode for a solid oxide fuel cell according to an embodiment of the present invention.
2 is a block diagram showing a sheet manufacturing method of an electrode for a solid oxide fuel cell according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is a conceptual view showing a sheet manufacturing apparatus of a solid oxide fuel cell electrode according to an embodiment of the present invention, the present invention is a dam 200 on the transfer unit 100 moving in one direction in the drying chamber 300 When the slurry 400 discharged from the coating is applied, and the slurry 400 is dried and changed into the electrode sheet 400 ′, it can be understood that the electrode sheet for the solid oxide fuel cell is manufactured by sintering at a high temperature.

The transfer unit 100 moves in one direction the slurry 400 discharged and applied from the dam 200 to be described later.

The dam 200 is mounted to be movable along the longitudinal direction of the transfer unit 100 and is disposed close to the upper side of the transfer unit 100 to discharge the slurry 400 housed therein. It serves to apply a certain thickness to.

The drying chamber 300 has a sealed space in which the transfer unit 100 and the dam 200 are built, supports the movement of the transfer unit 100 while guiding the movement of the dam 200, and transfer unit 100. The slurry 400 'coated on the sheet) is heated and dried to change the electrode sheet 400' for the solid oxide fuel cell.

Separation piece 500 serves to separate the electrode sheet 400 'transported by the transfer unit 100 to the outlet side of the drying chamber 300 from the transfer unit 100.

Here, the electrode sheet 400 ′ may be sintered at a high temperature and finally manufactured into an electrode sheet for a solid oxide fuel cell.

The present invention can be applied to the embodiments as described above, it is of course possible to apply a variety of embodiments as follows.

First, the transfer unit 100 is to provide a space in which the slurry 400 is applied and conveyed as described above, it can be seen that the structure including the conveying roller 110 and the conveying film (120).

For reference, reference numeral 400 ′ denotes a slurry in which the slurry 400 accommodated in the dam 200, which will be described later, is applied to the transfer unit 100 and dried in the drying chamber 300, where the next process is performed. It is defined as a sign that simultaneously displays the electrode sheet to be moved to.

The feed roller 110 is at least one or more that is mounted on the lower side of the drying chamber 300 and rotates in one direction. Although not specifically illustrated, the feed roller 110 may be rotated by a driving force by mounting a driving motor at one end of the rotating shaft 112. .

The conveying film 120 is a belt-shaped member wound around the outer circumferential surface of the conveying roller 110 and linked to the rotation of the conveying roller 110 and to which the slurry 400 is applied.

Here, the end of the rotation shaft 112 of the feed roller 110 is preferably rotatably supported inside the drying chamber 300, which will be described later, the feed roller 110 is a longitudinal direction of the drying chamber 300, that is, slurry A plurality of 400 is mounted along the moving direction, but the deformation and application of additionally installing the auxiliary roller of the non-driven auxiliary roller to prevent sagging of the transfer film 120 are also possible between the transfer rollers 110.

On the other hand, the dam 200 is provided with a space for discharging the slurry 400 is applied on the transfer film 120, as described above, comprising a reservoir 210, a blade 220 and a moving assembly 230 It can be seen that the structure.

The reservoir 210 has a structure in which an inner space in which the slurry 400 supplied from the outside is accommodated is provided, and a discharge slit 212 through which the slurry 400 is discharged toward the transfer unit 100 is provided at a lower side thereof. .

Here, the slurry 400 is a mixture of 92 mol% ZrO₂ and 8 mol% Y₂O₃ with water or ethanol, which is used for several hours using a ball mill. Therefore, a mixture of toluene with a binder added to a mixed powder of 92 mol% ZrO 2 and 8 mol% Y 2 O 3 may be used.

In this case, the binder is methyl cellulose (methyl cellulose) dispersed and dissolved in ethyl alcohol and toluene, is a raw material of the slurry 400, by adding an additive such as nickel, chromium, or lithium to these raw materials, mixed and stirred and vacuum degassing To produce a slurry (400).

In addition, the reservoir 210 is preferably formed with a guide surface 202 is formed to be inclined in the opposite direction to the blade 220 from the other edge of the discharge slit 212 to guide the discharge of the slurry (400).

The blade 220 is formed along one edge of the discharge slit 212 at the lower side of the reservoir 210 to form an inclination with the moving direction of the transfer unit 100 and close to the upper side of the transfer film 120. The thickness of the slurry 400 ′ applied to the upper side of the transfer film 120 is determined by the distance d between the end edge of the blade 220 and the top of the transfer film 120, and the distance d described above. May vary according to the height adjustment of the blade 220.

The above-mentioned distance d may be appropriately varied in the range of about 0.5 to 3 mm.

The moving assembly 230 is mounted on one side of the reservoir 210 to reciprocate the reservoir 210 in parallel with the moving direction of the transfer unit 100, the movable assembly 230 can be reciprocated inside the drying chamber 300 Preferably supported.

On the other hand, the drying chamber 300 is provided with a space for drying the electrode sheet 400 'as described above, the housing 310 is provided with a dryer 320, the support bracket 330 and the guide rail 340 It can be seen that the structure.

The housing 310 is provided with a space for accommodating the transfer unit 100 and the dam 200, and can be constructed by designing a length, a width, and a height appropriately for a working environment.

The dryer 320 is mounted on one side of the housing 310 to supply heat along the moving direction of the transfer unit 100. As the dryer 320, the electrode sheet may be formed from a mechanism such as a heater or a heating wire. It is possible to remove moisture contained in the electrode sheet 400 'by adopting a method such that radiant heat is reached at 400') or spraying hot air to the electrode sheet 400 'from a mechanism such as a heating fan. .

The support bracket 330 is mounted on the lower inner surface of the housing 310 to support the rotation of the transfer roller 110 while supporting the end of the rotation unit 112 of the transfer unit 100, more specifically, the transfer roller 110. do.

The guide rail 340 is mounted on both sides of the inner surface of the housing 310 in parallel and in parallel with the moving direction of the transfer unit 100, specifically, the transfer film 120, and the dam 200, that is, the moving assembly 230. To support the round trip.

Here, the moving assembly 230 may be applied to the form of a moving block reciprocating on the guide rail 340, that is, the position control can be precisely performed, such as the LM guide, as shown, the above-described moving block Although not specifically illustrated, the guide rail 340 is coupled through the screw rod mounted in parallel with, and mounted on the end of the screw rod can reciprocate the guide rail 340 according to the operation of the drive motor to rotate forward and reverse.

In addition, the movable assembly 230 is a pinion coupled to the rack gears in which a plurality of gears are arranged in a line along the longitudinal direction of the guide rail 340 in addition to the structure shown in FIG. Application of the embodiment of moving the dam 200 by gear coupling is also possible.

In addition, the moving assembly 230 is not limited to the above-described embodiment, but may be anything as long as the structure of the implementation and applicable.

On the other hand, the separation piece 500 serves to separate the electrode sheet 400 'coated and dried from the transfer film 120 of the transfer unit 100, on a straight line with the upper surface of the transfer film 120. It can be seen that the structure includes a lower surface 510 is disposed, and the separation slope 520 formed to be inclined upwardly from the lower surface toward the outlet side of the drying chamber 300 in the transport direction of the electrode sheet 400 '.

That is, the electrode sheet 400 ′ is separated from the transfer unit 100 from the point i at which the separation slope 520 starts.

On the other hand, a space for accommodating the electrode sheet 400 'separated by the separating piece 500 is formed at the outlet side of the drying chamber 300, and the heat treatment chamber 600 for high temperature sintering of the electrode sheet 400' is further formed. Is formed extending.

Reference numeral 610 denotes a transfer conveyor, and 620 denotes a sintering furnace.

Here, in order to prevent the electrode sheet 400 ′ from being oxidized and deteriorated during the heat treatment process, an inert gas such as nitrogen gas may be injected to form an inert atmosphere in the heat treatment chamber 600.

With reference to FIG. 2, a method of manufacturing an electrode sheet using a sheet manufacturing apparatus of an electrode for a solid oxide fuel cell according to an embodiment of the present invention having the above configuration will be described.

Reference numerals not shown in FIG. 2 and a coupling relationship and position of each component refer to FIG. 1.

First, the slurry 400 is manufactured for the production of the electrode sheet 400 '.

Specifically, water or ethanol is mixed with 92 mol% of ZrO₂ and 8 mol% of Y₂O₃, and mixed for several hours using a ball mill, and in some cases, 92 mol% of ZrO2 and 8 mol% It is also possible to use a mixture of toluene added with a binder to the mixed powder of Y₂O₃.

The binder is methyl cellulose (methyl cellulose) dispersed and dissolved in ethyl alcohol and toluene, is a raw material of the slurry 400, by adding an additive such as nickel, chromium, or lithium to these raw materials, mixed and stirred and vacuum degassed slurry Will generate 400.

First, vacuum defoaming and stabilizing to discharge the slurry 400 accommodated in the dam 200 to apply the same thickness to the upper surface of the transfer film 120 of the transfer unit 100 moving in one direction and the electrode sheet 400 ' The first step (S10) of forming a.

Thereafter, a second step S20 is performed to block the inflow of outside air in the drying chamber 300 accommodating the transfer unit 100 and the dam 200 and to remove moisture by heating the electrode sheet 400 ′.

Here, the electrode sheet 400 ′ is dried in the drying chamber 300 at 70 to 150 ° C. for 5 to 7 hours, preferably about 6 hours.

Subsequently, when passing through the separation piece 500 disposed in line with the upper surface of the electrode sheet 400 ', the transfer film 120 is separated from the transfer film 120 and discharged from the drying chamber 300. S30 is made.

Next, a fourth step S40 of performing high temperature sintering of the electrode sheet 400 ′ discharged from the drying chamber 300 in the heat treatment chamber 600 extending from the drying chamber 300 is performed. ) Inside the sheet to obtain an electrode sheet 400 'having a sintered density of about 90% or more compared to the theoretical density by sintering the electrode sheet at 1,000 to 1,350 ° C. for 1 to 3 hours, preferably within 2 hours. have.

Here, in order to prevent the electrode sheet 400 ′ from being oxidized and deteriorated during the heat treatment process, an inert gas such as nitrogen gas may be injected to form an inert atmosphere in the heat treatment chamber 600.

As described above, the present invention can obtain a product of excellent quality at a uniform thickness, performs a series of processes continuously and minimizes the occurrence of defects, the sheet manufacturing apparatus of the electrode for a solid oxide fuel cell to achieve a rapid mass production And it can be seen that the basic technical idea to provide a manufacturing method.

It will be apparent to those skilled in the art that many other modifications and applications are possible within the scope of the basic technical idea of the present invention.

100 ... transfer unit 200 ... dam
300 ... drying chamber 400 ... slurry
400 '... electrode sheet 500 ... separation piece
600 ... heat treatment chamber

Claims (9)

A transfer unit moving in one direction;
A dam which is mounted to be movable along the longitudinal direction of the transfer unit and is disposed close to the upper side of the transfer unit and applied onto the transfer unit while discharging the slurry contained therein;
A sealed space in which the transfer unit and the dam are built is formed, to support the movement of the transfer unit while guiding the movement of the dam, and to change the slurry coated on the transfer unit into an electrode sheet for a solid oxide fuel cell. A drying chamber heated and dried; And
And a separating piece separating the electrode sheet conveyed by the conveying unit from the conveying unit at an outlet side of the drying chamber.
The electrode sheet discharged from the drying chamber is a sheet manufacturing apparatus of the electrode for a solid oxide fuel cell, characterized in that the contact with the outside air is sintered at a high temperature.
The method according to claim 1,
The transfer unit
At least one transfer roller mounted on a lower side of the drying chamber and rotating in one direction;
It is wound on the outer circumferential surface of the conveying roller and interlocked with the rotation of the conveying roller, and includes a conveying film having a belt shape to which the slurry is applied.
Rotating shaft end of the feed roller is a sheet manufacturing apparatus of the electrode for a solid oxide fuel cell, characterized in that rotatably supported inside the drying chamber, respectively.
The method according to claim 1,
The dam,
An inner space for accommodating the slurry supplied from the outside, and a storage tank having a discharge slit through which the slurry is discharged to the transfer unit side at a lower side thereof;
A blade formed along one side edge of the discharge slit on the lower side of the reservoir to be inclined with the moving direction of the transfer unit and close to the upper side of the transfer unit;
It is mounted to one side of the reservoir includes a moving assembly for reciprocating the reservoir in parallel with the movement direction of the transfer unit,
The moving assembly is a sheet manufacturing apparatus of the electrode for a solid oxide fuel cell, characterized in that supported in the drying chamber in a reciprocating manner.
The method according to claim 3,
The dam,
It is formed to be inclined in the opposite direction to the blade from the other edge of the discharge slit is further formed a guide surface for guiding the discharge of the slurry,
The thickness of the slurry applied to the upper side of the transfer unit is determined by the distance between the end edge of the blade and the upper portion of the transfer unit and the distance is variable according to the height adjustment of the blade, characterized in that the electrode for a solid oxide fuel cell Sheet manufacturing apparatus.
The method according to claim 1,
The drying chamber,
A housing provided with a space for accommodating the transfer unit and the dam;
A dryer mounted on one side of the housing to supply heat along a moving direction of the transfer unit;
A support bracket mounted to an inner surface of the lower side of the housing to support rotation of the transfer unit;
And a guide rail mounted parallel to both sides of the inner surface of the housing and parallel to the moving direction of the transfer unit, and configured to support a reciprocation of the dam.
The method according to claim 1,
The separation piece,
A lower surface disposed in line with the upper side of the transfer unit;
And a separating slope formed to be inclined upwardly from the lower surface toward the exit side of the drying chamber along the conveying direction of the electrode sheet,
The electrode sheet is a sheet manufacturing apparatus of the electrode for a solid oxide fuel cell, characterized in that separated from the transfer unit from the point where the separation slope begins.
The method according to claim 1,
The drying chamber,
A space for accommodating the electrode sheet extended to the outlet side of the drying chamber and separated and transported by the separating piece is formed, and a heat treatment chamber for sintering the electrode sheet at high temperature is further provided. Sheet manufacturing apparatus.
Vacuum degassing and stabilizing the first step of discharging the slurry contained in the dam to apply the same thickness to the upper side of the transfer unit moving in one direction to form an electrode sheet;
A second step of blocking the inflow of outside air in the drying chamber accommodating the transfer unit and the dam and removing moisture by heating the electrode sheet;
A third step of separating the electrode sheet from the transfer unit and discharging it from the drying chamber while passing through a separation piece arranged in line with the upper side of the transfer unit; And
And a fourth step of sintering the electrode sheet discharged from the drying chamber in a heat treatment chamber extending from the drying chamber. 4.
The method according to claim 8,
The electrode sheet,
In the drying chamber is dried for 5 to 7 hours at 70 to 150 ℃,
The sheet manufacturing method of the electrode for a solid oxide fuel cell, characterized in that the electrode sheet is sintered for 1 to 3 hours at 1,000 ~ 1,350 ℃ in the heat treatment chamber.

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