KR101640639B1 - Porous membrane, manufacturing porous membrane and fuel cell comprising pourous membrane - Google Patents

Porous membrane, manufacturing porous membrane and fuel cell comprising pourous membrane Download PDF

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KR101640639B1
KR101640639B1 KR1020130084036A KR20130084036A KR101640639B1 KR 101640639 B1 KR101640639 B1 KR 101640639B1 KR 1020130084036 A KR1020130084036 A KR 1020130084036A KR 20130084036 A KR20130084036 A KR 20130084036A KR 101640639 B1 KR101640639 B1 KR 101640639B1
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South Korea
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fiber
tubular
fabric
fibers
porous membrane
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KR1020130084036A
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Korean (ko)
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KR20150009733A (en
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오탁근
이종진
최광욱
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주식회사 엘지화학
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product
    • Y02P70/56Manufacturing of fuel cells

Abstract

The present disclosure relates to a porous membrane and a method of making the same. Further, the present invention relates to a fuel cell including the porous membrane.

Description

TECHNICAL FIELD [0001] The present invention relates to a porous membrane, a method of manufacturing the porous membrane, and a fuel cell including the porous membrane. [0002]

TECHNICAL FIELD [0001] The present invention relates to a porous membrane comprising a fabric and a method for producing the same. Further, the present invention relates to a fuel cell including the porous membrane.

Recently, as the exhaustion of existing energy resources such as oil and coal is predicted, interest in energy that can replace them is increasing. As one of such alternative energies, fuel cells are attracting particular attention due to their advantages such as high efficiency, emission of pollutants such as NO x and SO x , and abundant fuel.

A fuel cell is a power generation system that converts the chemical reaction energy of a fuel and an oxidant into electric energy. Hydrogen, hydrocarbons such as methanol and butane are used as fuel, and oxygen is used as an oxidant.

BACKGROUND ART Fuel cells include a polymer electrolyte fuel cell (PEMFC), a direct methanol fuel cell (DMFC), a phosphoric acid fuel cell (PAFC), an alkaline fuel cell (AFC), a molten carbonate fuel cell (MCFC) And a battery (SOFC).

The reaction (1/2 O 2 + 2e? O 2 - ) occurring in the cathode (cathode) of the fuel cell occurs mainly at the three-phase interface where the cathode, electrolyte and oxygen meet, get affected. Therefore, when the air electrode-electrolyte interface having a structure of increasing the contact area between the electrolyte and the air electrode while being well diffused is formed, not only the interface resistance of the air electrode-electrolyte is reduced, but also the electrode polarization resistance The performance of the air electrode as a whole is improved.

As a method of increasing the electrode performance by controlling the microstructure of such electrodes, a two-dimensional method of maximizing the filling density at the electrode / electrolyte interface by finely dispersing the fine electrode powder (M. Suzuki, H. Sasaki, S. Otoshi , J. Kagimura, N. Sugiura, and M. Ippommatsu, "High Performance Solid Oxide Fuel Cell Cathode Fabricated by Electrochemical Vapor Deposition," J. Electrochem. Soc., 141 (7), pp. 1928-1931 (1994) , And a three-dimensional method in which the electrode reaction occurs not only at the three phase interface but also at the electrode side away from the electrolyte (T. Kenjo and M. Nishiya, "LaMnO3 Air Cathodes Containing ZrO2 Electrolyte for High Temperature Solid Oxide Fuel Cells, Solid State Ionics, 57, pp. 295-302 (1992)).

Although such a three-dimensional method is desirable for improving electrode performance, it is possible only in a complex having a mixed conductor or ion and an electron conduction path at the same time. In addition, according to the above method, it is difficult to control the electrode powder and the electrolyte powder to be evenly distributed. Furthermore, there is a problem that the same materials coalesce with each other during sintering to interfere with the formation of a three-phase interface.

In order to solve the above problems, the present inventors intend to provide a porous film in which a three-phase interface can be uniformly formed.

The present disclosure includes a fabric comprising a first tubular fiber and a second tubular fiber, wherein the first tubular fiber and the second tubular fiber provide a porous membrane comprising different materials.

The present specification also provides an electrode comprising the porous membrane.

Also, the present disclosure relates to an anode; A cathode opposite to the anode; And an electrolyte membrane provided between the anode and the cathode, wherein the anode or the cathode is the electrode.

Further, the present specification discloses a stack including an interconnect that interconnects two or more unit cells together; A fuel supply unit for supplying fuel to the stack; And an air supply unit for supplying air to the stack, wherein the unit cell includes the membrane-electrode assembly.

Further, the present invention relates to a method of manufacturing a semiconductor device, comprising: forming a first fiber by coating an electron conductive material on a yarn; Coating another chamber with an ion conductive material to form a second fiber; Forming a fabric using the first fiber and the second fiber; And firing the fabric to form a fabric comprising first tubular fibers and second tubular fibers. ≪ Desc / Clms Page number 12 >

The porous membrane of the present disclosure can have a triple phase boundary at uniform and constant intervals.

In addition, the porous membrane of the present disclosure can easily control the area of the three phase interface.

In addition, the porous membrane of the present specification can easily control the gap through which fuel or oxygen passes.

In addition, the fuel cell including the porous membrane of the present invention can maintain stable performance.

Fig. 1 shows an example of mixed fibers formed by twisting first tubular fibers and second tubular fibers with each other.
Figure 2 illustrates a fabric according to one embodiment of the present disclosure.

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

The present disclosure includes a fabric comprising a first tubular fiber and a second tubular fiber, wherein the first tubular fiber and the second tubular fiber provide a porous membrane comprising different materials.

As used herein, the term "fiber" refers to a long, thin, linear object. Alternatively, the fiber may be a line-shaped object having a longer distance in the longitudinal direction than a distance in the thickness direction.

As used herein, the term "fabric" may refer to a fabric having warp and weft yarns crossed one above the other and knitted together to form a flat body of any width. There are plain weave, twill weave, and water weaving according to the method of weaving the above-mentioned fabric.

The plain weave is the simplest and narrowest of the ways in which the warp and weft are woven, and crosses the warp and weft one by one. Specifically, there are Fresco Ogandi, Tapata, and Muslin.

The twill is a fabric that allows the warp and weft yarns to cross each other by more than two o'clock. Specifically, there are denim, drill, gabardine, twill, tricot, and surge.

The warp yarns are arranged at regular intervals over four or more warp yarns and are smooth, uniform and glossy. Specifically, there are satin, damask, and atlas.

As used herein, the term "tubular fiber" refers to a fabric comprising hollow. Specifically, the tubular fiber may mean a fiber in which an empty space is continuously formed.

According to one embodiment of the present disclosure, the first tubular fiber may comprise an electron conduction material. Specifically, according to one embodiment of the present invention, the electron conductive material may be at least one selected from the group consisting of Ni, Cu, Lanthanum strontium cobalt ferrite (LSCF), Barium strontium cobalt ferrite (BSCF), Lanthanum strontium manganite (LSM), or samarium strontium cobaltite , LSCM (Lanthanum strontium cobalt manganite), and oxides thereof.

Also, according to one embodiment of the present disclosure, the second tubular fiber may comprise an ionic conduction material. Specifically, according to one embodiment of the present disclosure, the ion conducting material is selected from the group consisting of Yttria Stabilized Zirconia (YSZ), Scandia Stabilized Zirconia (ScSZ), Samarium Doped Ceria (SDC), Gadolinium Dopped Ceria (GDC), and Lanthanum Strontium Gallate Magnesite). ≪ / RTI >

The YSZ is a yttria (yttria) stabilized zirconia, (Y 2 O 3) x (ZrO 2) may be represented by 1-x, x may be 0.05 to 0.15 days.

The ScSZ is Scandinavian stabilized zirconium oxide and can be expressed as (Sc 2 O 3 ) x (ZrO 2 ) 1-x , where x can be 0.05 to 0.15.

The SDC may be represented by (Sm 2 O 3 ) x (CeO 2 ) 1-x as samarium doped ceria, and x may be 0.02 to 0.4.

The GDC may be represented by (Gd 2 O 3 ) x (CeO 2 ) 1-x as gadolinium doped ceria, and x may be 0.02 to 0.4.

Specifically, the region where the first tubular fiber and the second tubular fiber are in contact may be a triple phase boundary. That is, the three-phase interface where the electrode, the electrolyte, and the gas meet as the electrochemical reaction region can be formed while the electron conduction material and the ion conductive material exist independently of each other.

More specifically, the first tubular fiber may be an electron moving region, and the second tubular fiber may be an ion moving region. Further, the voids of the fabric may be a moving region of the gas, and may be a moving region of the hollow duct of the first and second tubular fibers.

According to one embodiment of the present disclosure, the fabric may weave the first tubular fiber into a weft, and the second tubular fiber into a warp.

Alternatively, according to one embodiment of the present disclosure, the fabric may warp the first tubular fiber and weft the second tubular fiber into a weft.

According to one embodiment of the present disclosure, when forming the fabric by using the first tubular fiber and the second tubular fiber as a weft yarn and a warp yarn, the method of knitting a fabric and adjusting the porosity of the fabric by loosening the fabric And the area of the three phase interface can be adjusted.

According to one embodiment of the present disclosure, the fabric may weave mixed fibers formed by twisting the first tubular fiber and the second tubular fiber together into a weft yarn and a warp yarn.

FIG. 1 illustrates an example of the mixed fibers according to an embodiment of the present invention. Further, FIG. 2 shows an example of weaving a fabric using the mixed fibers. According to one embodiment of the present invention, the area of the three-phase interface can be adjusted depending on the degree of twisting of the mixed fibers. Further, when the fabric is formed by using the mixed fibers as a weft yarn and a warp yarn, the porosity of the fabric can be controlled by the method of weaving the fabric and the loosening of the fabric, and the area of the three-phase interface can be controlled.

According to one embodiment of the present invention, the diameters of the first tubular fiber and the second tubular fiber may be independently from 1 mu m to 100 mu m.

According to one embodiment of the present invention, the hollow diameters of the first tubular fiber and the second tubular fiber may be independently from 0.1 mu m to 10 mu m. Specifically, the diameter of the hollow may be 1% or more and 10% or less of the diameter of the first or second tubular fibers.

As used herein, the term "diameter" means the vertical cross-sectional length in the longitudinal direction. Specifically, it may mean the longest distance from one point of the vertical section to another point.

According to one embodiment of the present invention, the porosity of the porous membrane may be 10% or more and 60% or less.

The porosity of the porous membrane may refer to the ratio of the porosity of the porous membrane excluding the hollow pores in the fiber. Alternatively, the porosity of the porous membrane may mean the ratio of voids of the fabric.

The present specification provides an electrode comprising the porous membrane.

According to an embodiment of the present invention, in the electrode, an area where the first tubular fiber and the second tubular fiber of the porous membrane are in contact with each other may be a triple phase boundary.

According to an embodiment of the present invention, the electrode may be an anode (anode).

According to one embodiment of the present disclosure, the anode may include an anode support layer (ASL) and an anode functional layer (ASL).

According to one embodiment of the present disclosure, the electrode is an anode, and the porous membrane may be an AFL. Specifically, the porous membrane may be provided between the ASL and the electrolyte membrane. More specifically, the porous membrane may be a region in contact with the electrolyte membrane to cause an electrochemical reaction.

According to an embodiment of the present invention, the electrode may be a cathode (air electrode).

According to an embodiment of the present invention, the cathode may include a Cathode Support layer (CSL) and a Cathode Functional Layer (CFL).

According to one embodiment of the present disclosure, the electrode is a cathode, and the porous membrane may be a cathode functional layer (CFL).

According to one embodiment of the present disclosure, the ASL serves as a support layer of the anode, and may be formed to be relatively thicker than the AFL. The ASL also allows the fuel to reach the AFL smoothly. The electrical conductivity can be made excellent.

According to one embodiment of the present disclosure, the CSL serves as a support layer of the cathode, and may be formed to be relatively thicker than the CFL. In addition, the CSL allows the air to reach the CFL smoothly. The electrical conductivity can be formed to be excellent. A cathode opposite to the anode; And an electrolyte membrane provided between the anode and the cathode, wherein the anode or the cathode is the electrode.

Further, the present specification discloses a stack including an interconnect that interconnects two or more unit cells together; A fuel supply unit for supplying fuel to the stack; And an air supply unit for supplying air to the stack, wherein the unit cell includes the membrane-electrode assembly.

According to one embodiment of the present invention, the solid oxide fuel cell uses a solid oxide having ion conductivity as an electrolyte. The solid oxide fuel cell has high efficiency, high durability, various kinds of fuel can be used, and manufacturing cost is low.

According to an embodiment of the present invention, the interconnect may include a fuel passage through which fuel can move to each unit cell, and an air passage through which air can move to each unit cell.

According to one embodiment of the present disclosure, the stack may be a stack of two or more unit cells. In addition, the interconnect may include a fuel flow path and an air flow path connecting the unit cells.

According to an embodiment of the present invention, the stack may further include a separator for stacking the unit cells in series and electrically connecting the unit cells with each other.

The present disclosure relates to a method of forming a first fiber by coating an electronic conductive material on a yarn to form a first fiber; Coating another chamber with an ion conductive material to form a second fiber; Forming a fabric using the first fiber and the second fiber; And firing the fabric to form a fabric comprising first tubular fibers and second tubular fibers. ≪ Desc / Clms Page number 11 >

The thread in this specification can be used without limitation as long as it is a commonly used thread. Specifically, the yarn in this specification can be used without limitation as long as it can be removed by a firing process. More specifically, the yarn may be a cotton yarn, a silk yarn, a nylon yarn, or the like.

In the above manufacturing method of the present invention, the electron conduction material and the ion conduction material may be the same as the above-mentioned electron conduction material and ion conduction material.

According to an embodiment of the present invention, the first fiber and the yarn in the second fiber are annihilated by the sintering step, thereby forming the first tubular fiber and the second tubular fiber including a hollow therein.

According to the manufacturing method of the present specification, the area of the three phase interface can be adjusted by a simple method.

According to an embodiment of the present invention, the forming of the first fiber may be a dip coating of the yarn into a slurry prepared using an electron conduction material.

According to an embodiment of the present invention, the step of forming the second fibers may be a step of dip-coating the slurry with the ion conductive material.

The dip coating of the present invention can be applied without limitation as long as it is a dip coating method generally performed in the art.

According to one embodiment of the present disclosure, the step of forming the fabric may be performed by using the first fiber and the second fiber as a weft yarn and a warp yarn, respectively.

Alternatively, according to one embodiment of the present invention, the first fiber and the second fiber may be produced using warp and weft yarns, respectively.

According to an embodiment of the present invention, the step of forming the fabric may be performed by using mixed fibers prepared by weaving the first and second fibers together as a weft yarn and a warp yarn.

According to an embodiment of the present invention, the firing temperature of the firing step may be 1000 ° C or higher and 1600 ° C or lower.

Claims (21)

  1. A fabric comprising a first tubular fiber and a second tubular fiber,
    Wherein the first tubular fiber and the second tubular fiber comprise different materials.
  2. The method according to claim 1,
    The fabric may be formed by weaving the first tubular fiber into a weft, the second tubular fiber into a warp,
    Wherein the first tubular fibers are warp yarns and the second tubular fibers are weft yarns.
  3. The method according to claim 1,
    Wherein the fabric is formed by weaving the mixed fibers formed by twisting the first tubular fiber and the second tubular fiber with a weft yarn and a warp yarn.
  4. The method according to claim 1,
    Wherein the first tubular fiber and the second tubular fiber each independently have a diameter of 1 占 퐉 or more and 100 占 퐉 or less.
  5. The method according to claim 1,
    Wherein the first tubular fibers and the second tubular fibers each have a hollow diameter of 0.1 mu m or more and 10 mu m or less.
  6. The method according to claim 1,
    Wherein the porosity of the porous membrane is 10% or more and 60% or less.
  7. The method according to claim 1,
    Wherein the first tubular fiber comprises an electron conduction material and the second tubular fiber comprises an ionic conduction material.
  8. The method according to claim 1,
    The first tubular fiber is made of Ni, Cu, Lanthanum strontium cobalt ferrite (LSCF), Barium strontium cobalt ferrite (BSCF), Lanthanum strontium manganite (LSM), samarium strontium cobaltite (SSC), Lanthanum strontium cobalt manganite And at least one selected from the group consisting of the following.
  9. The method according to claim 1,
    The second tubular fiber is selected from the group consisting of Yttria Stabilized Zirconia (YSZ), Scandia Stabilized Zirconia (ScSZ), Samarium Doped Ceria (SDC), Gadolinium Dopped Ceria (GDC), Lanthanum Strontium Gallate Magnesite (LSGM) A porous membrane comprising one or more species.
  10. An electrode comprising a porous membrane according to any one of claims 1 to 9.
  11. The method of claim 10,
    Wherein the region in which the first tubular fiber and the second tubular fiber are in contact is a triple phase boundary.
  12. The method of claim 10,
    Wherein the electrode is an anode and the porous membrane is an AFL (Anode Functional Layer).
  13. The method of claim 10,
    Wherein the electrode is a cathode and the porous membrane is a CFL (Cathode Functional Layer).
  14. Anode; A cathode opposite to the anode; And an electrolyte membrane provided between the anode and the cathode, wherein the membrane-
    Wherein the anode or the cathode is an electrode according to claim 11.
  15. A stack including interconnects connecting two or more unit cells together;
    A fuel supply unit for supplying fuel to the stack; And
    And an air supply unit for supplying air to the stack,
    Wherein the unit cell comprises the membrane-electrode assembly according to claim 14.
  16. Coating a yarn with an electron conductive material to form a first fiber;
    Coating another chamber with an ion conductive material to form a second fiber;
    Forming a fabric using the first fiber and the second fiber; And
    Firing said fabric to form a fabric comprising first tubular fibers and second tubular fibers
    Of the porous membrane according to any one of claims 1 to 9.
  17. 18. The method of claim 16,
    Wherein the forming of the first fiber comprises dip coating the seal in a slurry prepared using an electron conducting material.
  18. 18. The method of claim 16,
    Wherein the forming of the second fibers comprises dip coating the chamber in a slurry prepared using an ion conducting material.
  19. 18. The method of claim 16,
    The forming of the fabric may be performed using the first and second fibers as weft and warp yarns, respectively,
    Wherein the first fiber and the second fiber are used as warp yarns and weft yarns, respectively.
  20. 18. The method of claim 16,
    Wherein the forming of the fabric is performed by using mixed fibers prepared by knitting the first and second fibers together as a weft yarn and a warp yarn.
  21. 18. The method of claim 16,
    Wherein the firing temperature in the firing step is 1000 占 폚 or more and 1600 占 폚 or less.
KR1020130084036A 2013-07-17 2013-07-17 Porous membrane, manufacturing porous membrane and fuel cell comprising pourous membrane KR101640639B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002280018A (en) 2000-12-22 2002-09-27 Nok Corp Solid oxide porous membrane and its manufacturing method

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KR100477885B1 (en) * 2002-07-08 2005-03-18 베스 주식회사 Method of making lithium ion polymer battery and porous polymeric electrolte
AU2004230360B2 (en) * 2003-04-16 2010-08-05 Kureha Corporation Porous film of vinylidene fluoride resin and method for producing same
EP2506339B1 (en) * 2009-11-23 2018-01-10 LG Chem, Ltd. Method for preparing separator having porous coating layer, separator formed therefrom and electrochemical device containing same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002280018A (en) 2000-12-22 2002-09-27 Nok Corp Solid oxide porous membrane and its manufacturing method

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