KR20170120452A - Composite materials separator and method of manufacturing the same - Google Patents

Abstract

A composite separator capable of improving the electrical conductivity of both the surface and the thickness direction and a method of manufacturing the composite separator.
The composite separator according to the present invention comprises a carbon fiber weave; A conductive powder filled inside the carbon fiber woven fabric; And upper and lower conductive coating layers respectively disposed on the upper and lower surfaces of the carbon fiber woven fabric and coalesced with the carbon fiber woven fabric.

Description

Technical Field [0001] The present invention relates to a composite material separator,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite separator and a method of manufacturing the same, and more particularly, to a composite separator capable of improving electrical conductivity in both the surface and thickness directions and a method of manufacturing the same.

The separator plate, which is a component of the fuel cell stack, functions as a reaction gas (hydrogen and oxygen) supply and water discharge passage, and electrically connects the inside of the fuel cell stack. For this function, the separator requires excellent electrical conductivity, mechanical properties, corrosion resistance and low hydrogen permeability.

Recently, a separator plate is also included in a hydrogen fuel cell, a redox flow cell, etc., which are attracting a great deal of attention among large secondary batteries. As described above, the hydrogen fuel cell and the redox flow cell driven in an acidic atmosphere are required to have properties such as electrical conductivity, mechanical properties, corrosion resistance, chemical resistance and electrolyte impermeability.

In order to satisfy this, a composite separator plate in which a carbon fiber woven fabric is impregnated with a thermosetting resin has been produced. In order to impart electrical conductivity to such a composite separator, a large amount of highly conductive conductive powder must be mixed in the thermosetting resin.

However, when a conductive powder is mixed with a thermosetting resin in a large amount, high strength and a blocking ratio of a fuel material can not be secured, and even when a large amount of conductive powder is added, it is difficult to secure electrical characteristics.

A related prior art is Korean Patent Publication No. 10-2005-0120257 (published on December 22, 2005), which discloses a carbon composite material separator for fuel cells.

It is an object of the present invention to provide a composite separator which can improve the electrical conductivity of both the surface and the thickness direction and a method of manufacturing the composite separator.

According to an aspect of the present invention, there is provided a composite separator comprising: a carbon fiber woven fabric; A conductive powder filled inside the carbon fiber woven fabric; And upper and lower conductive coating layers respectively disposed on the upper and lower surfaces of the carbon fiber woven fabric and coalesced with the carbon fiber woven fabric.

According to an aspect of the present invention, there is provided a method for fabricating a composite separator, comprising: (a) filling a conductive fiber into a carbon fiber fabric; (b) forming upper and lower conductive coating layers on the upper and lower surfaces of the carbon fiber woven fabric filled with the conductive powder; And (c) pressing and hardening the carbon fiber woven fabric and the upper and lower conductive coating layers by a hot press to obtain a composite separator plate.

The composite separator according to the present invention and the method for fabricating the same may be manufactured by first filling a powdery conductive powder in a carbon fiber woven fabric and then forming upper and lower conductive coating layers on both surfaces of the carbon fiber woven fabric filled with conductive powder , the surface electrical conductivity in the x-axis and y-axis directions as well as the vertical electric conductivity in the z-axis direction can be improved.

Accordingly, the composite separator according to the present invention can secure the surface electrical conductivity in the x-axis and y-axis directions by the upper and lower conductive coating layers formed on both sides of the carbon fiber woven fabric, Since the filled conductive powder has a structure for organically connecting the spaces between the carbon fiber woven fabrics, the vertical electrical properties in the z-axis direction can be improved and the contact resistance can be improved.

1 is a cross-sectional view of a composite separator according to an embodiment of the present invention;
Figure 2 is a perspective view of the carbon fiber woven fabric of Figure 1;
3 is a process flow diagram illustrating a method of manufacturing a composite separator according to an embodiment of the present invention.
FIGS. 4 to 6 are cross-sectional views illustrating a method of manufacturing a composite separator according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a composite separator according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a composite separator according to an embodiment of the present invention, and FIG. 2 is a perspective view illustrating the carbon fiber woven fabric of FIG. 1.

Referring to FIGS. 1 and 2, a composite separator 100 according to an embodiment of the present invention includes a carbon fiber woven fabric 110, a conductive powder 120, and upper and lower conductive coating layers 130 and 140. At this time, the conductive powder 120 is filled in the carbon fiber woven fabric 110, and the carbon fiber woven fabric 110 filled with the conductive powder 120 passes through the upper and lower conductive coating layers 130 and 140 and the hot press hot press method so as to be bonded to each other.

The carbon fiber woven fabric 110 is used as a core base material disposed in the middle of the composite separator plate 100 to improve the mechanical strength of the composite separator plate 100. The carbon fiber woven fabric 110 preferably has a thickness of 200 to 400 mu m. When the thickness of the carbon fiber woven fabric 110 is less than 200 mu m, the thickness of the carbon fiber woven fabric 110 may be too small to secure mechanical strength. On the contrary, when the thickness of the carbon fiber woven fabric 110 is more than 400 μm, the thickness and the volume of the carbon fiber woven fabric 110 are increased only without increasing the effect, which results in a decrease in weight and thickness.

At least one of these carbon fiber woven fabrics 110 may be stacked vertically. The carbon fiber woven fabric 110 can be produced by weaving fiber bundles of 1,000 to 70,000 strands respectively in weft and warp yarns. Accordingly, the carbon fiber woven fabric 110 may include the warp carbon fiber 112 disposed in the weft direction and the warp carbon fiber 114 disposed in the oblique direction.

At this time, the fiber bundles of the carbon fiber woven fabric 110 have a circular or elliptical cross-sectional structure. The fiber bundles of the carbon fiber woven fabric 110 may have an average spacing of 1.5 to 2.0 mm.

The conductive powder 120 is filled inside the carbon fiber woven fabric 110. The conductive powder 120 is filled in the carbon fiber woven fabric 110 by a coating method to improve the vertical electric conductivity of the z-axis.

For this purpose, the conductive powder 120 may be a carbon nanotube, a graphite powder, a chopped carbon fiber, a carbon black, a carbon powder, a graphite nano plate graphite nanoplate, and graphene.

At this time, the conductive powder 120 may be directly filled into the carbon fiber woven fabric 110 by a powder coating method. Alternatively, the conductive powder 120 may be formed by applying an organic solvent and a dispersion liquid dispersed in an epoxy liquid resin having a viscosity of 100 cp or less to both surfaces of the carbon fiber woven fabric 110 by an air jet method and then drying the same to volatilize the organic solvent Coating method.

In this case, the organic solvent may include volatile organic solvents such as ethanol, butanol, ethyl acetate, octanol, ethoxy ethanol pentanol, methoxy ethanol, ethylene glycol, acetone, tetrahydrofuran, dimethylformamide, dimethylamine, dichloromethane And diethyl ether may be used.

The upper and lower conductive coating layers 130 and 140 are disposed on the upper and lower surfaces of the carbon fiber woven fabric 110 respectively and joined together with the carbon fiber woven fabric 110.

The upper and lower conductive coating layers 130 and 140 are joined together with the carbon fiber woven fabric 110 by a hot pressing process. At this time, the upper and lower conductive coating layers 130 and 140 have a structure in which a portion of the carbon fiber woven fabric 110 is impregnated by being adhered to the carbon fiber woven fabric 110 and integrally connected to each other.

At this time, the upper and lower conductive coating layers 130 and 140 preferably have a thickness of 5 to 100 μm. If the thickness of each of the upper and lower conductive coating layers 130 and 140 is less than 5 占 퐉, the thickness is too thin, which makes handling difficult and deteriorates surface electrical conductivity. Conversely, if the thickness of each of the upper and lower conductive coating layers 130 and 140 exceeds 100 mu m, it may be a factor that raises the manufacturing cost without increasing any further effect, which is not economical.

These upper and lower conductive coating layers 130 and 140 each include a conductive filler impregnated within a resin layer and a resin layer.

The resin layer serves to improve the mechanical strength. The resin layer is formed of any one material selected from among a phenol resin, an epoxy resin, an amino resin, a urea resin, a melamine resin, an unsaturated polyester resin, a polyurethane resin and a thermosetting resin including a polyimide resin.

The conductive filler is added and dispersed in the resin layer to improve the surface electrical conductivity of the x-axis and the y-axis. For this purpose, the conductive filler may be a carbon nanotube, a graphite powder, a chopped carbon fiber, a carbon black, a carbon powder, a graphite nanoplate ), And graphene.

At this time, it is preferable that each of the upper and lower conductive coating layers 130 and 140 is added in an amount of 15 to 25% by weight based on the solid content of the conductive filler. When the content of the conductive filler is less than 15% by weight, it may be difficult to secure surface electrical conductivity. Conversely, if the content of the conductive filler exceeds 25% by weight, coating failure due to clogging of the nozzle may be caused.

If only the upper and lower conductive coating layers 130 and 140 are formed on both sides of the carbon fiber woven fabric 110 without filling the carbon fiber woven fabric 110 with the conductive powder 120, A problem that the conductive filler is concentrated only in a large amount on the surface of the carbon fiber woven fabric 110 used as the core substrate of the core material and the vertical electrical conductivity in the z-axis direction is poor due to the problem that it can not penetrate into the carbon fiber woven fabric 110 .

Alternatively, the composite separator according to an embodiment of the present invention may be formed by first filling a powdery conductive powder in a carbon fiber woven fabric, and then forming an upper and a lower conductive coating layer on both sides of the carbon fiber woven fabric filled with the conductive powder. , It is possible to improve the vertical electric conductivity in the z-axis direction together with the surface electric conductivity in the x-axis and y-axis directions.

Therefore, the composite separator according to the embodiment of the present invention can ensure the surface electrical conductivity in the x-axis and y-axis directions by the upper and lower conductive coating layers formed on both sides of the carbon fiber woven fabric, The vertical electrical characteristics in the z-axis direction can be improved, and the contact resistance can be improved, as the conductive powder filled in the inside of the carbon fibers has a structure for organically connecting the spaces between the carbon fiber woven fabrics.

As a result, the composite separator according to the embodiment of the present invention has a surface electric conductivity of 100 to 200 S / cm, a contact resistance of 10 mΩ / cm 2 or less, and a flexural strength of 80 MPa or less.

Hereinafter, a method of manufacturing a composite separator according to an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a process flow chart illustrating a method of manufacturing a composite separator according to an exemplary embodiment of the present invention, and FIGS. 4 to 6 are cross-sectional views illustrating a method of manufacturing a composite separator according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the composite separator manufacturing method according to the embodiment of the present invention includes a conductive powder filling step (S110), an upper and lower conductive coating layer forming step (S120), and a hot pressing step (S130).

Conductive powder filling

As shown in FIGS. 3 and 4, in the conductive powder filling step S110, the conductive powder 120 is filled in the carbon fiber woven fabric 110.

At least one of the carbon fiber woven fabric 110 may be stacked vertically. The carbon fiber woven fabric 110 can be produced by weaving fiber bundles of 1,000 to 70,000 strands respectively in weft and warp yarns. Accordingly, the carbon fiber woven fabric 110 may include the warp carbon fiber 112 disposed in the weft direction and the warp carbon fiber 114 disposed in the oblique direction.

At this time, the fiber bundles of the carbon fiber woven fabric 110 have a circular or elliptical cross-sectional structure. The fiber bundles of the carbon fiber woven fabric 110 may have an average spacing of 1.5 to 2.0 mm.

The conductive powder 120 is filled in the carbon fiber woven fabric 110 by a coating method to improve the vertical electric conductivity of the z-axis.

In this step, it is preferable to vibrate the carbon fiber woven fabric 110 so that the conductive powder 120 is easily inserted into the carbon fiber woven fabric 110.

For this purpose, the conductive powder 120 may be a carbon nanotube, a graphite powder, a chopped carbon fiber, a carbon black, a carbon powder, a graphite nano plate graphite nanoplate, and graphene.

At this time, the conductive powder 120 may be directly filled into the carbon fiber woven fabric 110 by a powder coating method. Alternatively, the conductive powder 120 may be formed by applying an organic solvent and a dispersion liquid dispersed in an epoxy liquid resin having a viscosity of 100 cp or less to both surfaces of the carbon fiber woven fabric 110 by an air jet method and then drying the same to volatilize the organic solvent Coating method.

In this case, the organic solvent may include volatile organic solvents such as ethanol, butanol, ethyl acetate, octanol, ethoxy ethanol pentanol, methoxy ethanol, ethylene glycol, acetone, tetrahydrofuran, dimethylformamide, dimethylamine, dichloromethane And diethyl ether may be used.

Formation of upper and lower conductive coating layers

3 and 5, in the upper and lower conductive coating layer forming step S120, upper and lower conductive coating layers 130 and 140 are formed on the upper and lower surfaces of the carbon fiber woven fabric 110 filled with the conductive powder 120, ).

These upper and lower conductive coating layers 130 and 140 each include a conductive filler impregnated within a resin layer and a resin layer.

The resin layer serves to improve the mechanical strength. The resin layer is formed of any one material selected from among a phenol resin, an epoxy resin, an amino resin, a urea resin, a melamine resin, an unsaturated polyester resin, a polyurethane resin and a thermosetting resin including a polyimide resin.

Conductive fillers are added and dispersed in the resin layer to improve the surface electrical conductivity of the x-axis and y-axis. For this purpose, the conductive filler may be a carbon nanotube, a graphite powder, a chopped carbon fiber, a carbon black, a carbon powder, a graphite nanoplate ), And graphene.

At this time, it is preferable that each of the upper and lower conductive coating layers 130 and 140 is added in an amount of 15 to 25% by weight based on the solid content of the conductive filler. When the content of the conductive filler is less than 15% by weight, it may be difficult to secure the surface electric conductivity. Conversely, if the content of the conductive filler exceeds 25% by weight, coating failure due to clogging of the nozzle may be caused.

In this step, the upper and lower conductive coating layers 130 and 140 are formed by at least one of knife coating, spray coating, dip coating, and bar coating methods. . At this time, the thicknesses of the upper and lower conductive coating layers 130 and 140 can be adjusted by adjusting the spray time, the dip coating time, the height of the knife or the height of the bar.

Hot press

3 and 6, in the hot pressing step S130, the carbon fiber woven fabric 110 and the upper and lower conductive coating layers 130 and 140 are pressed and cured by hot pressing to form the composite separator plate 100 .

At this time, the hot press is preferably carried out at 130 to 200 DEG C under a pressure of 10 to 30 MPa for 10 to 60 minutes. If the hot press temperature is less than 130 占 폚 or the hot press time is less than 10 minutes, there is a great possibility that sufficient curing is not achieved. On the contrary, when the hot press temperature exceeds 200 占 폚 or the hot press time exceeds 60 minutes, it may be a factor that raises only the manufacturing cost without increasing any further effect, which is not economical.

If the hot press pressure is less than 10 MPa, the interfacial adhesion force between the carbon fiber woven fabric 110 and the upper and lower conductive coating layers 130 and 140 may not be sufficient and peeling may occur. Conversely, if the hot press pressure exceeds 30 MPa, cracks or the like may occur in the carbon fiber woven fabric 110 and the upper and lower conductive coating layers 130 and 140 due to excessive pressure.

In this hot pressing step S130, the thickness of the carbon fiber woven fabric 110 and the upper and lower conductive coating layers 130 and 140 is reduced by the compression. After performing the hot pressing step S130, the carbon fiber woven fabric 110 may have a thickness of 200 to 400 占 퐉, and each of the upper and lower conductive coating layers 130 and 140 may have a thickness of 5 to 100 占 퐉.

The composite separator produced by the above-described processes (S110 to S130) may be prepared by first filling powdery conductive powder in a carbon fiber woven fabric, and then forming upper and lower conductive coating layers on both sides of the carbon fiber fabric filled with conductive powder , It is possible to improve the vertical electric conductivity in the z-axis direction together with the surface electric conductivity in the x-axis and y-axis directions.

Therefore, the composite separator manufactured by the method according to the embodiment of the present invention can ensure the surface electrical conductivity in the x-axis and y-axis directions by the upper and lower conductive coating layers formed on both surfaces of the carbon fiber woven fabric, , The contact resistance can be improved by improving the vertical electrical characteristic in the z-axis direction as the conductive powder filled in the carbon fiber woven fabric has a structure for organically connecting the carbon fiber woven fabric between the woven and nonwoven.

As a result, the composite separator produced by the method according to the embodiment of the present invention has a surface electrical conductivity of 100 to 200 S / cm, a contact resistance of 10 mΩ / cm 2 or less, and a flexural strength of 80 MPa or less.

Example

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

1. Composite separator manufacturing

Example 1

A carbon fiber woven fabric having an average thickness of 250 mu m was dispersed in acetone in an amount of 3 wt% of graphite nanoplate (GNP), and then immersed in a solution in which 10 wt% of an epoxy resin was mixed so that GNP could be bound to the surface of the carbon fiber woven fabric , Subjected to sonication vibration treatment for 15 minutes and dried at 60 DEG C for 1 hour to fill graphite nanoplate (GNP) into the inside of the carbon fiber woven fabric.

Next, 15 parts by weight of carbon nanotube (CNT) 5 + graphite nanoplate (GNT) was added to 100 parts by weight of epoxy resin, and the dispersion was applied to the top and bottom of the carbon fiber woven fabric by knife coating Respectively, to form upper and lower conductive coating layers.

Next, the carbon fiber woven fabric having the graphite nanoplate (GNP) inserted therein and the upper and lower conductive coating layers were pressed and cured by hot pressing for 30 minutes under the conditions of 150 ° C and 20 MPa to prepare a composite separator having a thickness of 250 μm .

Example 2

A composite separator was prepared in the same manner as in Example 1, except that the carbon fiber woven fabric was immersed in acetone in a solution in which 5 wt% of graphite nanoplate (GNP) and 10 wt% of epoxy resin were dispersed and mixed.

Example 3

A composite material plate was prepared in the same manner as in Example 1, except that the carbon fiber woven fabric was immersed in acetone in a solution prepared by dispersing 3 wt% of graphite nanoplate (GNP) and 15 wt% of epoxy resin.

Example 4

Example 1 was repeated except that the carbon fiber woven fabric was immersed in a solution prepared by dispersing acetone in 3 wt% of graphite nanoplate (GNP) and 10 wt% of epoxy resin, and subjected to sonication vibration treatment for 30 minutes and drying at 60 DEG C for 1 hour. The composite separator was prepared in the same manner.

Example 5

Example 1 was repeated except that the carbon fiber woven fabric was immersed in a solution prepared by dispersing acetone in 3 wt% of graphite nanoplate (GNP) and 10 wt% of epoxy resin, and subjected to sonication vibration treatment for 15 minutes and drying at 60 DEG C for 2 hours. The composite separator was prepared in the same manner.

Comparative Example 1

A dispersion solution prepared by adding 15 parts by weight of carbon nanotubes (CNT) to 100 parts by weight of epoxy resin was coated on the top and bottom of the carbon fiber woven fabric by a knife coating method to form an upper and a lower conductive coating layer .

Next, the carbon fiber woven fabric and the upper and lower conductive coating layers were pressed and cured by hot pressing for 30 minutes under the conditions of 160 DEG C and 20 MPa to prepare composite separator plates.

Comparative Example 2

A composite separator was prepared in the same manner as in Example 1, except that the carbon fiber woven fabric was immersed in acetone in a solution in which 10 wt% of graphite nanoplate (GNP) and 10 wt% of epoxy resin were dispersed and mixed.

Comparative Example 3

A composite material plate was prepared in the same manner as in Example 1, except that the carbon fiber woven fabric was immersed in acetone in a solution in which 3 wt% of graphite nanoplate (GNP) and 20 wt% of epoxy resin were dispersed and mixed.

Comparative Example 4

Example 1 was repeated except that the carbon fiber woven fabric was immersed in a solution prepared by dispersing 3 wt% of graphite nanoplate (GNP) and 10 wt% of epoxy resin in acetone, sonicated for 5 minutes, and dried at 60 DEG C for 1 hour. The composite separator was prepared in the same manner.

Comparative Example 5

Example 1 was repeated except that the carbon fiber woven fabric was immersed in a solution prepared by dispersing acetone in 3 wt% of graphite nanoplate (GNP) and 10 wt% of epoxy resin, and subjected to sonication vibration treatment for 15 min and drying at 60 캜 for 30 min. The composite separator was prepared in the same manner.

2. Property evaluation

Table 1 shows the physical property evaluation results of the composite separator plates prepared according to Examples 1 to 5 and Comparative Examples 1 to 5.

1) Surface electrical conductivity

The surface electrical conductivity was measured based on the 4-point probe method.

2) Contact resistance

Measurement method: A copper electrode / GDL / separator / GDL / copper electrode was laminated in this order, and a voltage drop between the copper electrodes was measured while applying a current of 5 A to both copper electrodes. The resistance was measured by dividing the value of the current applied to the voltage and the area of the separator used for the measurement was multiplied. At this time, the separation plate was 5 cm in width and 5 cm in length.

In order to reduce the contact resistance between the copper electrode and the GDL, the copper electrode / GDL / copper electrode was laminated in this order and then the resistance was measured. The contact resistance of the separating plate was calculated by subtracting the above value.

3) Flexural strength

Flexural strength was measured according to ASTM D790-10. The size of the specimen was 1.27 cm (width) and 12.7 cm (length).

[Table 1]

As shown in Table 1, in the case of the composite separator prepared according to Examples 1 to 5, surface electrical conductivity and flexural strength were not significantly different from those of Comparative Examples 1 to 5, Lt; 2 > / cm < 2 >

On the other hand, in the case of Comparative Example 1 in which the graphite nanoplate (GNP) was not filled, there was no significant difference in surface electrical conductivity, but the contact resistance was measured to be considerably higher than in Example 1, Respectively.

In the case of Comparative Example 2 in which graphite nanoplate (GNP) was added in an amount of 10 wt%, contact points between carbon fibers and GNP increased, contact resistance was slightly reduced as compared with Example 1, and carbon content in the specimen was large. Of the total number of workers.

In the case of Comparative Example 3 in which the epoxy resin was added in an amount of 20 wt%, the excess epoxy resin wrapped around the surface of the carbon fiber before the conductive coating layer was covered, so that the contact resistance was measured to be significantly higher than that in Example 1 .

In the case of Comparative Example 4 in which the ultrasonic vibration treatment was performed for 5 minutes, the ultrasonic vibration processing time was not sufficient and the graphite nanoplate (GNP) was not sufficiently filled into the carbon fiber, It can be confirmed that the measured value is high.

In the case of Comparative Example 5 in which the drying time was reduced to 30 minutes, the drying time of acetone was insufficient and the conductive coating layer was applied while remaining in the specimen, and evaporated during the thermocompression bonding process to form pores in the specimen, And the bending strength is lowered due to the pores.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. These changes and modifications may be made without departing from the scope of the present invention. Accordingly, the scope of the present invention should be determined by the following claims.

100: Composite separator 110: Carbon fiber weave
112: weft carbon fiber 114: slanted carbon fiber
120: conductive powder 130: upper conductive coating layer
140: lower conductive coating layer
S110: Conductive powder filling step
S120: forming upper and lower conductive coating layers
S130: Hot press step

Claims (16)

Carbon fiber weave;
A conductive powder filled inside the carbon fiber woven fabric; And
Upper and lower conductive coating layers disposed on the upper and lower surfaces of the carbon fiber woven fabric, respectively, and joined to the carbon fiber woven fabric;
. ≪ / RTI >
The method according to claim 1,
The carbon fiber weave
Composite separator having a thickness of 200 to 400 탆.
The method according to claim 1,
The carbon fiber weave
At least one of which is vertically stacked.
The method according to claim 1,
The upper and lower conductive coating layers
Wherein the carbon fiber woven fabric is partially impregnated with the carbon fiber woven fabric by being adhered to the carbon fiber woven fabric and integrally connected to each other.
The method according to claim 1,
The upper and lower conductive coating layers
A composite separator plate having a thickness of 5 to 100 탆.
The method according to claim 1,
The upper and lower conductive coating layers
A resin layer,
And a conductive filler impregnated in the resin layer.
The method according to claim 6,
The resin layer
And a thermosetting resin including a phenol resin, an epoxy resin, an amino resin, a urea resin, a melamine resin, an unsaturated polyester resin, a polyurethane resin and a polyimide resin.
The method according to claim 6,
The upper and lower conductive coating layers
Wherein the conductive filler is added in an amount of 15 to 25% by weight based on the solid basis.
The method according to claim 6,
The conductive powder and the conductive filler
Carbon nanotube, graphite powder, chopped carbon fiber, carbon black, carbon powder, graphite nanoplate, and graphene. ). ≪ / RTI >
(a) filling the interior of the carbon fiber woven with conductive powder;
(b) forming upper and lower conductive coating layers on the upper and lower surfaces of the carbon fiber woven fabric filled with the conductive powder; And
(c) pressing and hardening the carbon fiber woven fabric and the upper and lower conductive coating layers by hot pressing to obtain a composite separator plate;
≪ / RTI >
11. The method of claim 10,
The step (a)
Thereby vibrating the carbon fiber woven fabric to fill conductive fibers into the carbon fiber woven fabric.
11. The method of claim 10,
The upper and lower conductive coating layers
A resin layer,
And a conductive filler impregnated in the resin layer.
13. The method of claim 12,
The resin layer
And a thermosetting resin including a phenol resin, an epoxy resin, an amino resin, a urea resin, a melamine resin, an unsaturated polyester resin, a polyurethane resin and a polyimide resin.
13. The method of claim 12,
The conductive powder and the conductive filler
Carbon nanotube, graphite powder, chopped carbon fiber, carbon black, carbon powder, graphite nanoplate, and graphene. ). ≪ / RTI >
11. The method of claim 10,
In the step (c)
The hot press
And a pressure of 10 to 30 MPa at 130 to 200 DEG C for 10 to 60 minutes.
11. The method of claim 10,
In the step (c)
The upper and lower conductive coating layers
Wherein the carbon fiber woven fabric is partially impregnated with the carbon fiber woven fabric by lapping with the carbon fiber woven fabric so that they are integrally connected to each other.

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