KR20150045305A - Method for manufacturing seperator and seperator - Google Patents

Abstract

The present invention relates to a method for manufacturing a separator and a separator which extends a service life of a battery and improves the stability of the battery when applied to the battery. According to the present invention, the method for manufacturing a separator comprises: a step of filling pores on a porous base material with an ion transfer resin solution by using a dip coating method; a step of forming a coating layer containing the ion transfer resin solution on both sides of the porous base material by using a die coating method; and a step of drying the porous base material.

Description

[0001] METHOD FOR MANUFACTURING SEPERATOR AND SEPERATOR [0002]

The present application relates to a separation membrane production method and separation membrane.

The separation membrane used in the redox flow cell or the fuel cell should have i) good proton conductivity. And ii) to prevent cross-over of the electrolyte material, iii) to have strong chemical resistance during battery cell operation, iv) to have enhanced mechanical properties, and v) And have a swelling ratio. Conventionally used separation membranes are difficult to satisfy all of the above five characteristics. Therefore, development of a membrane material having improved characteristics has been required.

The challenges addressed by the present application are: i) excellent proton conductivity, ii) prevention of cross-over of electrolyte materials, iii) strong chemical resistance, iv) mechanical properties, v) low swelling ratio effects And a method for producing the separation membrane.

Another problem to be solved by the present application is to provide a redox flow cell or a fuel cell to which the separation membrane is applied.

The problems to be solved by the present application are not limited to the above-mentioned technical problems, and other technical problems which are not mentioned can be clearly understood by those skilled in the art from the following description.

One embodiment of the present application includes the steps of filling a pore of a porous substrate with an ion-transfer resin solution by a dip coating method; Forming a coating layer comprising an ion-transfer resin on both surfaces of the porous substrate by a die coating method; And drying the porous base material.

Another embodiment of the present application provides a separation membrane produced according to the above production method.

Other embodiments of the present application include a porous substrate filled with pores of an ion-transfer resin; And a coating layer provided on both surfaces of the porous substrate and including an ion-transfer resin.

Other embodiments of the present application include a cathode; Anode; And a separation membrane positioned between the cathode and the anode.

Other embodiments of the present application include a supply roll for supplying a porous substrate; A dipping unit for immersing the porous substrate in the ion-transfer resin solution; A first coating for forming a coating layer comprising an ion-transfer resin on one side of the porous substrate; A second coating portion for forming a coating layer including an ion-transfer resin on the other surface of the porous substrate; A rotating roller for moving the porous substrate by friction force in contact with one surface of the porous substrate; And a drier for drying the porous base material.

The separation membrane according to one embodiment of the present application is advantageous in that it has excellent proton conductivity by filling the pores of the porous substrate with the ion transfer resin, reduces the swelling phenomenon of the separation membrane during cell operation, and has high mechanical strength. In addition, since the coating layer having a uniform thickness is formed on the surface of the porous substrate, the surface roughness is small, crossover phenomenon of the electrolyte material is prevented, and strong chemical resistance is obtained. Therefore, application of the separation membrane to a redox flow cell or a fuel cell has the effect of improving the life and safety of the cell.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows a separation membrane according to one embodiment of the present application, wherein (a) shows a porous substrate before preparation of a separation membrane, and (b) is a separation membrane produced.
2 shows an apparatus for producing a separation membrane according to one embodiment of the present application.
3 shows an apparatus for producing a separation membrane according to one embodiment of the present application.

Brief Description of the Drawings The advantages and features of the present application, and how to accomplish them, will be apparent with reference to the embodiments described below in conjunction with the accompanying drawings. The present application, however, is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles of the invention as defined in the appended claims. Is provided to fully convey the scope of the invention to those skilled in the art, and this application is only defined by the scope of the claims. The dimensions and relative sizes of the components shown in the figures may be exaggerated for clarity of description.

Unless defined otherwise, all terms, including technical and scientific terms used herein, may be used in a manner that is commonly understood by one of ordinary skill in the art to which this application belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

Hereinafter, the present application will be described in detail.

One embodiment of the present application relates to a porous substrate filled with an ion transfer resin in a pore; And a coating layer provided on both surfaces of the porous substrate and including an ion-transfer resin.

Another embodiment of the present application includes the steps of: (S10) filling the pores of the porous substrate with an ion transfer resin solution by a dip coating method; (S20) forming a coating layer comprising an ion-transfer resin on both surfaces of the porous substrate by a die coating method; And drying the porous substrate (S30).

Another embodiment of the present application provides a separation membrane produced according to the above production method.

The separation membrane of the present application has excellent proton conductivity by filling the pores of the porous base material with the ion transfer resin, and has the advantage of reducing the swelling phenomenon of the separation membrane during operation of the battery cell and increasing the mechanical strength. In addition, since the coating layer having a uniform thickness is formed on the surface of the porous substrate, the surface roughness is small, crossover phenomenon of the electrolyte material is prevented, and strong chemical resistance is obtained. Therefore, application of the separation membrane to a redox flow cell or a fuel cell has the effect of improving the life and safety of the cell.

Conventional separators used only ion transfer water, so electrolyte materials were crossovered, their chemical resistance was weak, and their mechanical strength was weak.

On the other hand, when the separation membrane is manufactured, the roughness of the surface of the porous substrate becomes large when the dip coating method alone is used, which is a problem in cell closure. In addition, when the separator is manufactured, if the die coating method alone is used, the surface roughness is improved, but the ion-transfer resin is not filled in the pores, the mechanical strength is weak, and the separator is swollen at the time of battery cell operation . In addition, the simultaneous use of the dip coating method and the die coating method has a limitation in the process. However, the present inventors have found that by applying the dip coating method and the die coating method to the continuous process, Respectively.

However, by using both the dip coating method and the die coating method, the manufacturing method of the separator of the present application is advantageous in that the produced separator is excellent in i) excellent proton conductivity, ii) prevention of cross-over of electrolyte material, iii) , iv) mechanical strength, and v) reduced swelling ratio.

As used herein, the term " separator " refers to a membrane capable of ion exchange and includes a membrane, an ion exchange membrane, an ion transport membrane, an ion conductive membrane, an ion exchange membrane, an ion exchange membrane, an ion conductive membrane, Or an ion conductive electrolyte membrane.

In the manufacturing method according to one embodiment of the present application, the drying step (S30) may be performed after forming the coating layer (S20), or after the step (S10) of filling the pores with the ion- . Or after step (S10) of filling the pores with the ion-transfer resin solution and after step (S20) of forming the coating layer.

The manufacturing method according to one embodiment of the present application is characterized in that after the step (S10) of filling the pores of the porous substrate with the ion-transfer resin solution by the dip coating method, the ion- And forming a coating layer (S20). After the step (S20) of forming the coating layer, drying (S30) of the porous substrate may be further included. Or drying (S30) the porous substrate both after step (S10) of filling the ion-transfer resin solution and after step (S20) of forming the coating layer.

The manufacturing method according to one embodiment of the present application is characterized in that, after the step (S20) of forming a coating layer comprising an ion-transfer resin on both surfaces of a porous substrate by a die coating method, ion- And filling the resin solution (S10). After the step (S10) of filling the ion-transfer resin solution, drying (S30) of the porous substrate may be further included. Or drying (S30) the porous substrate both after step (S10) of filling the ion-transfer resin solution and after step (S20) of forming the coating layer.

(S10) filling the pores of the porous substrate with the ion-transfer resin solution by the dip coating method of the above manufacturing method; And forming the coating layer including the ion-transfer resin on both surfaces of the porous substrate by the die coating method (S20) can be continuously performed in one step. (S10) filling the pores of the porous substrate with the ion transfer resin solution by the dip coating method of the above manufacturing method; (S20) forming a coating layer comprising an ion-transfer resin on both surfaces of the porous substrate by a die coating method; And drying the porous substrate (S30) can be continuously performed in one process.

(S10) of filling the pores of the porous substrate with the ion-transfer resin solution by the dip coating method according to one embodiment of the present application will be described.

The step (S10) of filling the pores of the porous substrate with the ion transfer resin solution may further include the step (S15) of flattening the surface of the porous substrate. The surface of the porous substrate may be planarized after the ion-transfer resin solution is filled into the pores of the porous substrate by a dip coating method. The porous substrate may be dried (S30) after filling the pores of the porous substrate with the ion transfer resin (S10) and planarizing the surface of the porous substrate (S15). Alternatively, the porous substrate may be filled with ion- ), And after the porous substrate is dried (S30), the surface of the porous substrate may be planarized (S15).

The surface planarization may be performed using screws and / or rollers.

The porous substrate may be one or more of high density polyethylene, low density polyethylene, linear low density polyethylene, ultrahigh molecular weight polyethylene, polypropylene tererephthalate, polyethylene terephthalate But are not limited to, polyethyleneterephthalates, polybutyleneterephthalates, polyesters, polyacetals, polyamides, polycarbonates, polyimides, polyetheretherketones, ), Polyethersulfone, polyphenylene oxide, polyphenylenesulfroid, and polyethylenenaphthalene. The term " polyphenylene sulfide "

The porous substrate may be in the form of a nonwoven fabric made of the above material.

The pores of the porous substrate may have a cross-sectional diameter of 0.01 to 50 micrometers and a porosity of 5 to 95%. The pore size should be 0.01 micrometer or more and the porosity should be 5% or more for the purpose of performing the role of the proton transport path. The pore size should be 50 micrometers or less and the porosity should be 95% or less to maintain the mechanical properties desirable.

The shape of the pores is not limited as long as a passage communicating from one surface of the porous substrate to another surface can be formed. For example, pores of a three-dimensional shape having a circle, an ellipse, and a polygonal cross-section may be connected to each other to form a passage from one surface of the porous substrate to the other surface. Alternatively, for example, the top surface of the cylinder may be located on one side of the porous substrate and the bottom surface may be located on the other side of the porous substrate, since the cross section is a circular or elliptical cylinder.

In the present specification, the cross-sectional diameter of the pores means the largest diameter of the cross-section perpendicular to the thickness direction of the porous substrate in any one pore.

When the pores are filled with the ion transfer resin, a proton transfer path can be formed through the ion transfer resin. Therefore, the higher the ratio of the ion-transfer resin to the pores, the better the proton conductivity.

The thickness of the porous substrate may be 1 micrometer or greater and 200 micrometer or less. The thickness should preferably be at least 1 micrometer in terms of mechanical strength and less than 200 micrometers in order to prevent proton conductivity from being degraded.

The ion-transfer resin may include those conventionally known in the art if it is a polymer having proton conductivity. The polymer having hydrogen ion conductivity may be a polymer having one or two or more cation-exchange groups selected from the group consisting of a sulfonic acid group, a phosphoric acid group, a carboxylic acid group, a phosphoric acid group, a phosphonic acid group, and derivatives thereof in the side chain.

Specifically, the ion-transfer resin may be a perfluorosulfonic acid polymer such as Nafion, a hydrocarbon polymer, an aromatic sulfon polymer, an aromatic ketone polymer, a polybenzimidazole polymer, a polystyrene polymer, a polyester polymer, a polyimide Based polymer, polyvinylidene fluoride-based polymer, polyether sulfone-based polymer, polyphenylene sulfide-based polymer, polyphenylene oxide-based polymer, polyphosphazene-based polymer, polyethylene naphthalate-based polymer, polyester- Polybenzimidazole-based polymers, polyether ketone-based polymers, polyphenylquinoxaline-based polymers, polysulfone-based polymers, sulfonated polyarylene ether-based polymers, sulfonated polyether ketone-based polymers, sulfonated polyetheretherketone-based polymers , A sulfonated polyamide-based polymer, a sulfonated polyimide-based polymer, Poly phosphazene may include a polymer, a sulfonated polystyrene-based polymer and a radiation polymerization of a sulfonated polystyrene-based low density polyethylene -g- polymer one or more polymers selected from the group consisting of. Alternating copolymers, random copolymers, block copolymers, multi-block copolymers or graft copolymers of the above polymers.

The ion transfer resin solution may be a mixture of the ion transfer resin and a solvent. When the ion transfer resin solution is filled in the pores of the porous substrate and dried, the solvent is removed and only the ion transfer resin remains in the pores.

At this time, the solvent has a solubility index similar to that of the ion-transfer resin, and preferably has a low boiling point. This is because the mixing can be made uniform and then the solvent can be easily removed. Specifically, a solvent such as N, N-dimethylacetamide (DMAc), dimethyl sulfoxide (DMSO), N, N-dimethylformamide (DMF) acetone ), Tetrahydrofuran, methylene chloride, chloroform, dimethylformamide, N-methyl-2-pyrrolidone (NMP), cyclo Cyclohexane, water or a mixture thereof may be used as a solvent.

The viscosity of the ion-transfer resin solution may be 10 Poise or more and 2,000 Poise or less. 10 Poise or more, the impregnation of the ion-transfer resin can be properly performed in the porous substrate, and the ion-transfer resin can be uniformly coated on the surface of the porous substrate at a viscosity of 2,000 poise or less.

(S20) of forming a coating layer containing an ion-transfer resin on both surfaces of a porous substrate by a die coating method in the manufacturing method of the present application will be described.

The step of forming the coating layer (S20) may include forming a first coating layer by coating an ion-transporting resin solution on one surface of the porous substrate with a die coating method, To form a second coating layer. The method may further include a drying step (S30) after forming the coating layer (S20). In this case, after forming the first coating layer and forming the second coating layer, the porous layer The substrate may be dried (S30).

Alternatively, the porous substrate on which the first coating layer is formed may be dried (S30), the second coating layer may be formed, and the porous substrate on which the second coating layer is formed may be dried (S30).

The thickness of the coating layer may be specifically 0.1 micrometer or more, more specifically 1 micrometer or more, specifically 10 micrometer or less, more specifically 5 micrometer or less. The thickness of the separator should be 0.1 micrometer or more so that the surface of the separator can be uniformly maintained and excellent proton conductivity can be maintained. In addition, it should be 10 micrometers or less to prevent the mechanical strength from being lowered by the coating layer.

The step (S30) of drying the porous substrate in the manufacturing method of the present application can be performed by drying at a temperature of 80 ° C or more and 250 ° C or less for 5 minutes or more, more specifically 1 hour or more and 24 hours or less.

In the above production method, the separation membrane is a redox flow cell or a separation membrane for a fuel cell.

The separation membrane manufactured according to the manufacturing method of the present application is a porous substrate filled with pores of an ion transfer resin; And a coating layer provided on both surfaces of the porous substrate, the coating layer being made of an ion-transfer resin.

The mechanical strength of the separator according to one embodiment of the present application can be from 3 N / cm ² to 100 N / cm ² . It should be at least 3 N / cm ² to prevent deformation of the porous substrate during the dip coating and die coating process, and the ion-transfer resin may be impregnated properly in the porous substrate within 100 N / cm ² . At this time, the mechanical strength can be confirmed by measuring the tensile strength of the porous substrate.

The surface roughness of the separator according to one embodiment of the present application may be 1 micrometer or more and 10 micrometer or less. And it is preferably not less than 1 micrometer and not more than 10 micrometers. The surface roughness can be confirmed by measuring the thickness of the coating layer.

The separation membrane is a separation membrane for a redox flow cell or a fuel cell.

When the separation membrane is applied to a redox flow cell, the anode electrolyte and the cathode electrolyte may be separated from each other to prevent mixing of electrolytes, and only proton transfer may occur.

A separation membrane according to one embodiment of the present application is shown in Fig. 1 (a) shows the porous substrate before the separation membrane production, and (b) shows the separation membrane produced. 1, reference numeral 100 denotes a porous substrate including pores, reference numeral 110 denotes a porous substrate, and reference numeral 120 denotes pores. Reference numeral 140 denotes an ion-transfer resin, and reference numeral 200 denotes a separation membrane. Referring to FIG. 1, pores of a porous substrate are filled with an ion-transfer resin, and coating layers made of an ion-transfer resin are formed on both surfaces of the porous substrate.

One embodiment of the present application provides an apparatus for producing the separation membrane.

2 and 3 show an apparatus for producing a separation membrane according to one embodiment of the present application. Referring to FIGS. 2 and 3, the separation membrane production apparatus 300 includes a supply roll 310 for supplying a porous substrate; A dipping portion 320 for immersing the porous substrate in the ion transfer resin solution; A first coating portion 330 for forming a coating layer including an ion-transfer resin on one side of the porous substrate; A second coating portion 340 for forming a coating layer including an ion-transfer resin on the other surface of the porous substrate; A dryer (350) for drying the porous substrate; And a rotating roller 360 for moving the porous substrate by frictional force while being in contact with one side of the porous substrate.

The apparatus 300 for manufacturing a separation membrane may be constructed by changing the order of the dipping portion 320, the first coating portion 330, and the second coating portion 340.

The apparatus 300 for manufacturing a separation membrane may further include a dryer 350 between the dipping portion 320 and the first coating portion 330 and may include a first coating portion 330 and a second coating portion 340, A dryer 350 may be further provided.

The manufacturing apparatus 300 may further include a winding unit 370 wound around the manufactured separation membrane.

The manufacturing apparatus 300 includes a dipping unit 320 for introducing the porous substrate 110 from the supply roll 310 and immersing the porous substrate in the ion transfer resin solution 160 by a rotating roller 370 The pores 120 of the porous substrate are filled with the ion-transfer resin solution 160 while moving. A first coating layer including the ion transfer resin 140 is formed on the upper surface of the porous substrate in the first coating portion 330 while being moved by the rotating roller 360. In the second coating portion 340, A second coating layer including the ion-transfer resin 140 is formed on the lower surface of the substrate. Then, the film is moved to the dryer 350 by the rotating roller 360 to produce the separation membrane 200. The manufactured separation membrane 200 may be moved to the winding unit 370 by the rotating roller 360 and wound.

One embodiment of the present application includes a cathode; Anode; And a separation membrane positioned between the cathode and the anode.

Redox Flow Battery (Redox Flow Battery) is a system in which an active substance contained in an electrolyte is oxidized-reduced to be charged and discharged. An electrochemical storage device that stores chemical energy of an active material directly as electric energy to be. A redox flow battery utilizes the principle of charging and discharging electrons by receiving electrons when an electrolyte containing an active material having a different oxidation state meets the ion exchange membrane.

The redox flow cell may include, as an electrolyte, a cathode electrolyte and an anode electrolyte.

In general, a redox flow cell may include a cathode, a cathode cell including a cathode electrolyte, an anode cell including an anode and an anode electrolyte, and a separator disposed between the cathode cell and the anode cell. Here, a plurality of unit cells including a cathode cell, an anode cell, and a separation membrane may be stacked using a bipolar plate.

The redox flow battery may further include an electrolyte tank connected to the cathode cell and the anode cell, respectively, and may further include a pump for circulating the electrolyte.

The cathode electrolyte and the anode electrolyte may include a redox couple and an electrolytic solution.

The cathode electrolyte and the anode electrolyte may further include a conductive material, and the conductive material may be carbon, graphite, or TiO ₂ .

The cathode electrolyte and the anode electrolyte include an electrolyte, and the electrolyte may be an aqueous electrolyte, a non-aqueous electrolyte, an ionic liquid, or a mixture thereof.

The fuel cell is an energy conversion device that converts the chemical energy of the fuel directly into electrical energy. The fuel cell operates using a fuel gas and an oxidizing agent, and operates in a power generation mode in which electric power is generated using electrons generated during the redox reaction. The fuel cell may be a polymer electrolyte fuel cell (PEMFC). The polymer electrolyte fuel cell has a membrane electrode assembly (MEA) having a structure in which an anode (oxidizing electrode) and a cathode (reducing electrode) are coated on both sides of an electrolyte membrane composed of a polymer material as a unit cell, to be. The membrane-electrode assembly (MEA) is a part where hydrogen and oxygen are electrochemically reacted. In the oxidizing electrode, hydrogen or methanol, which is a fuel, is supplied to cause oxidation reaction of hydrogen to generate hydrogen ions (H ⁺ ) and electrons. , Hydrogen ions and oxygen that have passed through the polymer electrolyte membrane are combined with each other to generate water by the reduction reaction of oxygen.

Since the separator according to the present application is used as an electrolyte membrane of the fuel cell, it may not include a separate electrolyte.

When the separator of the present application is applied, the membrane electrode assembly has an advantage that the mechanical strength is greatly improved and the durability is excellent. Also, the hydrogen ion conductivity is excellent.

The membrane electrode assembly may be manufactured by a conventional method known to those skilled in the art, such that the catalyst layer of the anode and the catalyst layer of the cathode are in contact with the separator. For example, the cathode; Anode; And a separator located between the cathode and the anode in close contact with each other at a temperature of 100 ° C to 400 ° C. As another example, a cathode or an anode may be produced by directly coating an ink for an electrode catalyst on an electrolyte membrane.

Hereinafter, the present invention will be described in detail by way of examples and comparative examples in order to specifically explain the present application. However, the embodiments according to the present application can be modified into various other forms, and the scope of the present application is not construed as being limited to the embodiments described below. Embodiments of the present application are provided to more fully describe the present application to those of ordinary skill in the art.

≪ Example 1 >

An ion-transfer resin solution (viscosity 500 cPs, IEC 1.5), which is a sulfonated hydrocarbon-based polymer, was filled into the pores of a nonwoven fabric made of polypropylene having a porosity of 60% by dip coating method and the surface of the nonwoven fabric was smoothened with a screw and roller Primary drying. Thereafter, the upper and lower surfaces of the nonwoven fabric were each coated with an ion-transfer resin solution to a thickness of 5 μm and then dried. At this time, the roughness of the surface was measured by deviation of the membrane thickness, and was ± 5 micrometers. The ionic conductivity of the membrane was 0.15 S / cm.

≪ Comparative Example 1 &

An ion-transfer resin solution (viscosity 500 cPs, IEC 1.5), which is a sulfonated hydrocarbon-based polymer, was filled into the pores of a nonwoven fabric made of polypropylene having a porosity of 60% by dip coating method and the surface of the nonwoven fabric was smoothened with a screw and roller And dried. At this time, the roughness of the surface was measured by a deviation of the membrane thickness, and was ± 10 micrometers. The ionic conductivity of the membrane was 0.15 S / cm.

≪ Comparative Example 2 &

The nonwoven fabric made of polypropylene having a porosity of 60% was passed twice through the slot die, and the upper and lower surfaces of the nonwoven fabric were each immersed in an ion-transfer resin solution (viscosity 500 cPs, IEC 1.5), which is a sulfonated hydrocarbon- Coated and then dried. At this time, the roughness of the surface was measured by the deviation of the membrane thickness, and it was ± 5 micrometers, and the ionic conductivity of the membrane was 0.05 S / cm.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. It is therefore to be understood that the above-described embodiments are illustrative and non-restrictive in every respect.

100: Porous substrate containing pores
110: Porous substrate
120: Groundwork
140: ion transfer resin
160: ion transfer resin solution
200: separator
300: Separation membrane manufacturing apparatus
310:
320: Deep ping
330: first coating part
340: Second coating part
350: dryer
360: rotating roller
370:

Claims (23)

Filling the pores of the porous substrate with an ion-transfer resin solution by a dip coating method;
Forming a coating layer comprising an ion-transfer resin on both surfaces of the porous substrate by a die coating method; And
And drying the porous substrate. The method according to claim 1,
The step of filling the pores of the porous substrate with the ion-
≪ / RTI > further comprising the step of planarizing the surface of the porous substrate. The method according to claim 1,
Wherein the forming of the coating layer comprises:
A first coating layer is formed by coating an ion-transfer resin solution on one surface of a porous substrate by a die coating method,
And coating the ion transport resin solution on the other surface of the porous substrate by a die coating method to form a second coating layer. The method according to claim 1,
Wherein the thickness of the coating layer is 0.1 micrometer or more and 10 micrometer or less. The method according to claim 1,
The porous substrate may be one or more of high density polyethylene, low density polyethylene, linear low density polyethylene, ultrahigh molecular weight polyethylene, polypropylene tererephthalate, polyethylene terephthalate But are not limited to, polyethyleneterephthalates, polybutyleneterephthalates, polyesters, polyacetals, polyamides, polycarbonates, polyimides, polyetheretherketones, ), Polyethersulfone, polyphenylene oxide, polyphenylenesulfrode and polyethylenenaphthalene. The polyolefin resin according to any one of claims 1 to 5, (2). The method according to claim 1,
Wherein the pores of the porous substrate have a cross-sectional diameter of 0.01 to 50 micrometers and a porosity of 5 to 95%. The method according to claim 1,
Wherein the porous substrate has a thickness of 1 micrometer or more and 200 micrometers or less. The method according to claim 1,
Wherein the ion-transfer resin is a polymer having one or two or more cation-exchange groups selected from the group consisting of a sulfonic acid group, a phosphoric acid group, a carboxylic acid group, a phosphoric acid group, a phosphonic acid group, and derivatives thereof in a side chain. The method according to claim 1,
The ion transfer resin may be at least one selected from the group consisting of perfluorosulfonic acid polymer, hydrocarbon polymer, aromatic sulfon polymer, aromatic ketone polymer, polybenzimidazole polymer, polystyrene polymer, polyester polymer, polyimide polymer, polyvinylidene fluoride Based polymers, polyether sulfone type polymers, polyphenylene sulfide type polymers, polyphenylene oxide type polymers, polyphosphazene type polymers, polyethylene naphthalate type polymers, polyester type polymers, doped polybenzimidazole type polymers, Polyether ketone type polymers, polyphenylquinoxaline type polymers, polysulfone type polymers, sulfonated polyarylene ether type polymers, sulfonated polyether ketone type polymers, sulfonated polyether ether ketone type polymers, sulfonated polyamide type polymers , A sulfonated polyimide-based polymer, a sulfonated polyphosphazene-based polymer, Wherein the polymer is one or two or more polymers selected from the group consisting of sulfonated polystyrene-based polymers and radiation-polymerized sulfonated low density polyethylene-g-polystyrene-based polymers. The method according to claim 1,
Wherein the ion-transfer resin solution has a viscosity of 10 Poise or more and 2000 Poise or less. The method according to claim 1,
Wherein the separation membrane is for a redox flow cell or a fuel cell. A separator produced according to the method of any one of claims 1 to 11. A porous substrate filled with ion transfer resin in the pores; And
And a coating layer provided on both surfaces of the porous substrate and including an ion-transfer resin. 14. The method of claim 13,
Wherein the separation membrane has a mechanical strength of 3 N / cm ² or more and 100 N / cm ² or less. 14. The method of claim 13,
Wherein the separator has a surface roughness of not less than 1 micrometer and not more than 10 micrometers. 14. The method of claim 13,
Wherein the thickness of the coating layer is 0.1 micrometer or more and 10 micrometer or less, respectively. 14. The method of claim 13,
Wherein the ion-transfer resin is a polymer having one or two or more cation-exchange groups selected from the group consisting of a sulfonic acid group, a phosphoric acid group, a carboxylic acid group, a phosphoric acid group, a phosphonic acid group, and derivatives thereof in a side chain. 14. The method of claim 13,
The porous substrate may be one or more of high density polyethylene, low density polyethylene, linear low density polyethylene, ultrahigh molecular weight polyethylene, polypropylene tererephthalate, polyethylene terephthalate But are not limited to, polyethyleneterephthalates, polybutyleneterephthalates, polyesters, polyacetals, polyamides, polycarbonates, polyimides, polyetheretherketones, ), Polyethersulfone, polyphenylene oxide, polyphenylenesulfrode and polyethylenenaphthalene. The polyolefin resin according to any one of claims 1 to 5, Membrane. 14. The method of claim 13,
Wherein the pores of the porous substrate have a cross-sectional diameter of 0.01 to 50 micrometers and a porosity of 5 to 95%. 14. The method of claim 13,
Wherein the porous substrate has a thickness of 1 to 200 micrometers. 14. The method of claim 13,
Wherein the separation membrane is for a redox flow cell or a fuel cell. Cathode;
Anode; And
A reducting flow cell or fuel cell comprising the separator according to any one of claims 13 to 21 positioned between the cathode and the anode. A supply roll for supplying the porous substrate;
A dipping unit for immersing the porous substrate in the ion-transfer resin solution;
A first coating for forming a coating layer comprising an ion-transfer resin on one side of the porous substrate;
A second coating portion for forming a coating layer including an ion-transfer resin on the other surface of the porous substrate;
A rotating roller for moving the porous substrate by friction force in contact with one surface of the porous substrate; And
And a dryer for drying the porous substrate.

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