KR20170054689A - Separator for fuel cell, method for manufacturing the same and fuel cell comprising the same - Google Patents

Abstract

The present invention relates to a separation plate for a fuel cell, and to a fuel cell comprising the same, wherein the separation plate for a fuel cell comprises a thin metal plate, and a carbon composite layer positioned on at least one side of the thin plate, and a carbon composite comprises a carbon material and a polymer material. The polymer material comprises any one selected from a group consisting of a thermosetting resin, a thermoplastic resin, and a mixture thereof. The separation plate for a fuel cell according to the present invention can exhibit excellent mechanical strength and gas tightness, while being thin.

Description

Technical Field [0001] The present invention relates to a fuel cell separator, a method of manufacturing the fuel cell separator, and a fuel cell including the fuel cell separator,

TECHNICAL FIELD The present invention relates to a fuel cell separator which is thin in thickness but exhibits excellent mechanical strength, gas tightness and corrosion resistance, and is easy to mold, a method for producing the same, and a fuel cell including the same.

Fuel cells are attracting attention as one of the renewable energy sources as the importance of alternative energy due to depletion of energy resources is highlighted. In particular, fuel cells have been intensively studied due to their advantages of high efficiency and environmental friendliness.

The stack, which is a main part of the fuel cell system, is a set of stacked unit cells, and one cell is composed of a membrane electrode assembly (MEA) and a bipolar plate or separator. In the case of separator plates, the largest quantity is used in manufacturing the stack, and the structure of the stack is determined according to the shape of the separator plate.

The separator performs various functions such as supplying hydrogen and oxygen to the cathode and the anode respectively, preventing mixing of the supplied gases, transferring the generated electrons during the electrode reaction and discharging the water generated in the anode to the outside . Accordingly, the separator plate should have excellent electron conductivity for facilitating the movement of electrons, and have appropriate surface characteristics so that the water generated from the anode can be discharged smoothly. Further, in order to prevent mixing of the gas supplied to the cathode and the anode, it is required to have an excellent gas tightness and have proper corrosion resistance and strength characteristics according to the operating environment and operating conditions of the fuel cell. In addition, it should be thin and easy to process in order to access various fields such as home, automobile, and portable.

The material of the fuel cell separator that is currently being developed and used is a composite material of graphite, graphite and resin, or a metal material such as stainless steel or aluminum. However, in the case of producing a separator using graphite, there is a problem in that not only the flow cost of machining is high but also the time required for machining is long and the productivity is very low. In addition, when a separator of a metal base is manufactured, there is a disadvantage that it is easy to corrode while having good processability and dimensional accuracy. In addition, in the case of producing a separator using a composite material of graphite and resin, the above problems can be solved. However, it is difficult to store the material manufacturing environment and material, the dimensional precision of the product is low, It is not easy. In addition, when the composite material of graphite and resin is used as a thin plate, it is possible to reduce the volume of the fuel cell stack. Therefore, it is easy to access various fields such as home use, automobile, and portable. However, The bending strength and gas tightness are lowered.

Korean Patent Publication No. 2012-0128172 (published on November 27, 2012) Korean Patent Publication No. 2012-0093701 (published on August 23, 2012)

An object of the present invention is to provide a fuel cell separator which exhibits excellent mechanical strength, gas tightness and corrosion resistance while being thin, and can be easily formed, and a method for producing the same.

It is still another object of the present invention to provide a fuel cell including the fuel cell separator and exhibiting improved battery characteristics.

In order to achieve the above object, the present invention provides a carbon fiber composite material comprising a metal thin plate and a carbon composite material layer disposed on at least one side of the thin metal sheet, wherein the carbon composite material layer comprises a carbon material and a polymer material, , A thermoplastic resin, and a mixture thereof. The present invention also provides a fuel cell bipolar plate.

The thermosetting resin may be any one selected from the group consisting of a phenol resin, an epoxy resin, and a mixture thereof.

The thermosetting resin may be contained in an amount of 10 to 30% by weight based on the total weight of the carbon composite material layer.

The thermoplastic resin may be selected from the group consisting of polypropylene (PP), polyphenylenesulfide (PPS), polyvinylidene fluoride (PVDF), fluorinated ethylene propylene (FEP), perfluoroalkoxy , PFA), and mixtures thereof.

The thermoplastic resin may be contained in an amount of 10 to 30% by weight based on the total weight of the carbon composite material layer.

The polymer material may further comprise a curing agent and a curing accelerator.

The metal thin plate may be any one selected from the group consisting of aluminum, copper, carbon foil, titanium, iron, stainless steel (SUS), nickel, cobalt and alloys thereof.

The thickness of the thin metal plate may be 0.04 to 0.3 mm.

The metal thin plate surface may be plasma treated.

The carbon material may be any one selected from the group consisting of natural graphite, graphite impression, expanded graphite, artificial graphite, carbon black, graphene, carbon fiber, and mixtures thereof.

The carbon material may have a particle size of 5 to 300 mu m.

The fuel cell separator may further include an adhesive layer between the metal thin plate and the carbon composite material layer.

The adhesive layer may be one comprising a polymer material, a curing agent and a curing accelerator.

The fuel cell separator may have a flexural strength of 50 to 120 MPa, a density of 0.8 to 2.2 g / mL and an electrical conductivity of 80 to 250 S / cm.

The fuel cell separator may have a gas permeability of 2 X 10 ^-6 cm ³ / cm ² sec or less at a thickness of 0.1 to 1.5 mm.

In the fuel cell separator, a plurality of fuel channels through which fuel flows may be formed in one separator plate activation area, and fuel may be introduced into the fuel channels through different inlet manifolds and discharged through a discharge manifold.

The fuel cell separator may be applied to any one selected from the group consisting of a direct methanol fuel cell (DMFC), a polymer electrolyte fuel cell (PEMFC), and a phosphoric acid fuel cell (PAFC).

The present invention provides a method of manufacturing a carbon composite material, comprising the steps of: applying a carbon composite composition on a metal thin plate; passing the thin metal sheet coated with the carbon composite composition to a roller heated at 140 to 160 DEG C at a speed of 1 to 30 m / Wherein the carbon composite composition comprises a carbon material and a polymer material, and the polymer material is any one selected from the group consisting of a thermosetting resin, a thermoplastic resin and a mixture thereof. .

The compression molding may be one that implements a flow path shape.

The channel shape may be a structure (a structure in which protrusions and recesses are arranged in the channel direction) having protrusions and recesses that are different from each other in the opposite direction (opposite in thickness).

The manufacturing method may further include forming the adhesive layer by applying the polymer material to the thin metal plate before coating the carbon composite composition on the thin metal plate.

The fuel cell separator according to the present invention can exhibit excellent mechanical strength and gas tightness while being thin. As a result, the battery characteristics can be further improved when applied to a fuel cell.

FIG. 1 is a schematic structural view of a fuel cell separator 100 according to an embodiment of the present invention. FIG. 1 (a) is a plan view of a thin metal plate, and FIG.
FIG. 2 is a schematic structural view of a fuel cell bipolar plate 100 according to an embodiment of the present invention. FIG. 1 (b) is a plan view of a thin metal plate 120, a carbon composite layer 130, Fig.
3 is a cross-sectional view illustrating the compression molding process of the fuel cell separator 100 manufactured in the above-described embodiment and the comparative example.
4 is a cross-sectional structural view showing the flow path structure 200 of the fuel cell separator plate manufactured in Examples and Comparative Examples.
5 is a cross-sectional structural view showing a channel structure 200 of a general carbon composite separator.

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

A fuel cell bipolar plate according to an embodiment of the present invention includes a thin metal plate and a carbon composite layer positioned on at least one side of the thin plate.

The carbon composite material layer includes a carbon material and a polymer material, and the polymer material includes any one selected from the group consisting of a thermosetting resin, a thermoplastic resin, and a mixture thereof.

1 and 2 are schematic structural views of a fuel cell separator 100 according to an embodiment of the present invention. In FIG. 1, reference numeral 110 denotes a metal thin plate, 120 a carbon composite layer, and 130 an adhesive layer Fig. FIG. 1 is an illustration for illustrating the present invention, but the present invention is not limited thereto.

Referring to FIG. 1, the fuel cell bipolar plate 100 according to the present invention includes a thin metal plate 110 and a carbon composite layer 120.

The thin metal plate 110 may be formed of any one selected from the group consisting of aluminum, copper, carbon foil, titanium, iron, stainless steel (SUS), nickel, cobalt, Lt; / RTI >

The thin metal plate 110 may be a film or a sheet.

In addition, the thin metal plate 110 is preferably adjusted to have a thickness sufficient to exhibit a sufficient supporting effect in consideration of the total thickness of the separator and the kind of the material for forming the casing, and specifically 0.04 to 0.3 mm It may be desirable to have a strength in the range of 30 MPa to 70 MPa in the thickness range. If the thickness of the metal thin plate 110 is less than 0.04 mm, the mechanical strength characteristics may be deteriorated. If the thickness is more than 0.3 mm, the film or sheet can not be easily produced.

On the other hand, the carbon composite material layer 120 located on at least one side of the thin metal plate 110 is formed.

The carbon composite material layer 120 generally functions as a separator for a fuel cell, and includes a flow path 200 formed to flow gas or liquid on at least one outer surface. The carbon-carbon composite layer 120 may further include a plurality of manifolds as holes for supplying hydrogen and oxygen, or a cooling water passage (not shown) for maintaining the internal temperature during operation of the fuel cell. In addition, when the manifold is formed, it is preferable that the flow path is formed by connecting any two arbitrarily selected ones of the manifolds so that gas or liquid flowing from the manifold can flow.

The carbon composite material layer 120 may include a carbon material and a polymer material, and the polymer material may include any one selected from the group consisting of a thermosetting resin, a thermoplastic resin, and a mixture thereof.

The carbon material is preferably selected from the group consisting of natural graphite, impression graphite, expanded graphite, artificial graphite, carbon black, graphene, carbon fiber, and mixtures thereof, from the viewpoint of reinforcing property and workability.

The shape of the carbon material is not particularly limited, such as a particle shape, a plate shape and a scaly shape, but may preferably be particles having an average particle diameter of 5 to 300 탆. If the average particle diameter of the carbon material is less than 5 mu m, there is a concern that the carbon materials may aggregate, and if the average particle size of the conductive filler exceeds 300 mu m, the molding and gas tightness may decrease.

The carbon material may be contained in an amount of 50 to 90 wt%, more preferably 70 to 90 wt%, based on the total weight of the carbon composite material. When the content of the carbon material is less than 50% by weight, the effect of improving the conductivity and mechanical properties of the carbon material is insignificant. When the carbon material is used in an amount exceeding 90% by weight, Simultaneous molding of the manifold is difficult, and as the size of the separator to be formed becomes larger, the thickness variation becomes larger, and the strength and gas tightness may be lowered. The carbon material may be more preferably included in the thermosetting resin or the thermoplastic resin in a ratio of 2: 8 to 3: 7 in consideration of the reinforcing property, the conductivity, and the gas tightness improving effect according to the use of the carbon material .

Specifically, the thermosetting resin may be a phenol resin, an epoxy resin, a benzoxazine resin, a melamine resin, a polyurethane resin, a urea resin, an alkyd resin, a polyimide resin, or the like.

Among the above-mentioned thermosetting resins, it is most preferable to use any one selected from the group consisting of phenol resins, epoxy resins and mixtures thereof having excellent chemical resistance, corrosion resistance and durability.

The thermoplastic resin may be at least one selected from the group consisting of polypropylene (PP), polyphenylenesulfide (PPS), polyvinylidene fluoride (PVDF), fluorinated ethylene propylene (FEP), perfluoroalkoxy perfluoroalkoxy (PFA), and mixtures thereof.

The thermosetting resin or the thermoplastic resin may be contained in an amount of 10 to 30% by weight based on the total weight of the carbon composite material 120.

In order to thinly coat the thin metal plate 110 with the thermosetting carbon composite composition or the thermoplastic carbon composite 120 composition, the content of the thermosetting or thermoplastic resin may be increased to increase the bonding force with the thin metal plate 110. However, if the content of the thermosetting or thermoplastic resin exceeds 30% by weight, the electrical conductivity is lowered, so that it is difficult to produce a carbon composite composition capable of sufficiently bonding with the thin metal plate 110.

Further, the content of the thermosetting resin or the thermoplastic resin can be changed according to the kind of the carbon material. When the carbon material is expanded graphite, the thermosetting resin or the thermoplastic resin may be contained in an amount of 20 to 30% by weight based on the total weight of the carbon composite material 120.

The surface of the thin metal plate 110 may be plasma treated to improve the bonding strength between the thin metal plate 110 and the carbon composite material 120 or the adhesive layer 130 may be formed between the thin metal plate 110 and the carbon composite layer 120. [ ) Can be further included.

The adhesive layer can be formed by preparing a liquid composition containing a polymer material, a curing agent and a curing accelerator and thinly coating the surface of the thin metal plate.

The method of applying the liquid composition may be spraying or depositing using a spray.

Further, for the purpose of enhancing the physical properties of the fuel cell separator plate including the carbon composite material layer and improving the easiness of the manufacturing process, additives such as internal mold release agents, curing agents, curing accelerators, .

The curing agent is not particularly limited as long as it is usually used for curing a thermosetting resin. Specific examples thereof include an epoxy compound, an amine compound, a diamine compound, a polyamine compound, a polyamide compound or a phenol resin. . In particular, when the benzoxazine-based resin is used, an epoxy compound may be preferably used as the curing agent. Among the epoxy compounds, a cycloaliphatic epoxy resin or a cresol novolac epoxy resin Lt; / RTI >

At this time, the amount of the curing agent added is preferably 30 to 70 parts by weight based on 100 parts by weight of the thermosetting resin or the thermoplastic resin. When the content of the curing agent is less than 30 parts by weight, unreacted resin may remain, while when it exceeds 70 parts by weight, a part of the curing agent may be unreacted.

Further, in order to shorten the curing time, the curing accelerator may be further added together with the curing agent. As the curing accelerator, a basic compound such as triphenylphosphine (TPP) diaminodiphenylsulfone (DDS), a tertiary amine, an imidazole compound, an epoxy compound or a phenol compound may be used.

The addition amount of the curing accelerator is preferably 0.5 to 8 parts by weight based on 100 parts by weight of the thermosetting resin or the thermoplastic resin. If the content of the curing accelerator is less than 0.5 parts by weight, the working time is long, which is easy for the work but the curing speed is slow, which is not preferable because the molding time is long. When the content is more than 8 parts by weight, the curing speed is shortened, not.

When the carbon composite material composition further comprises a curing agent and a curing accelerator, it is preferable to mix the thermosetting resin or the thermoplastic resin, the curing agent and the curing accelerator first, and then mix the carbon material. In this case, It may be preferable to carry out a further pulverizing step for the mixture of the resin, the curing agent and the curing accelerator. By controlling the particle size of the thermosetting resin or the thermosetting resin and the curing agent to be the same level as the particle size of the carbon material through the pulverizing process, more homogeneous mixing can be performed and a quick curing reaction during molding is induced can do.

The prepared fuel cell separator has a thickness of 0.8 to 1.5 mm, a gas permeability of 1 X 10 ^-6 to 2 X 10 ^-6 cm ³ / cm ² sec, a flexural strength of 50 to 120 MPa, a density of 0.8 to 2.2 g / mL, and an electrical conductivity of 80 to 250 S / cm.

In the fuel cell separator, a plurality of fuel channels through which fuel flows may be formed in one separator plate activation area, and fuel may be introduced into the fuel channels through different inlet manifolds and discharged through a discharge manifold.

Specifically, the fuel cell includes a stack for generating electricity through an electrochemical reaction between a fuel and an oxidant, a fuel supply unit for supplying fuel to the electricity generation unit, and an oxidant supply unit for supplying an oxidant to the electricity generation unit, The stack includes a membrane-electrode assembly including an anode electrode and a cathode electrode positioned opposite to each other, and a polymer electrolyte membrane disposed between the anode electrode and the cathode electrode; And at least one unit cell including the fuel cell separator located on both sides of the membrane-electrode assembly.

Since each constituent part of the fuel cell is based on the configuration of a typical fuel cell, detailed description thereof will be omitted.

The fuel cell may be any one of a polymer electrolyte fuel cell (PEMFC), a direct methanol fuel cell (DMFC), a high temperature polymer electrolyte fuel cell, or a phosphoric acid fuel cell (PAFC) It is not.

Next, a method of manufacturing the fuel cell separator 100 will be described.

Applying the carbon composite 120 composition onto the metal thin plate 110 and the metal thin plate 110 and heating the metal thin plate coated with the carbon composite to a roller 140 heated at 140 to 160 캜 to 1 to 30 m / s < / RTI >

The carbon composite material includes a carbon material and a polymer material, and the polymer material includes any one selected from the group consisting of a thermosetting resin, a thermoplastic resin and a mixture thereof.

And applying the adhesive layer to the thin metal plate before applying the carbon composite composition.

The adhesive layer may be one comprising the polymer material, a curing agent and a curing accelerator.

A thin plate fuel cell separator intermediate body in which a thin metal plate 110 and a carbon composite material 120 are bonded to each other through a roller 140 at a temperature of 140 to 160 ° C which is a melting temperature of a thermosetting resin and a thermoplastic resin included in the carbon composite composition, .

In this case, it is important to prepare the semi-cured state in which the thermosetting resin is included in the carbon composite composition during the production of the intermediate, which is not completely cured.

The compression molding may be one that implements a flow path shape.

The channel shape may be a structure (a structure in which protrusions and recesses are arranged in the channel direction) having protrusions and recesses that are different from each other in the opposite direction (opposite in thickness) (FIG.

The flow path shape may be a structure having protruding portions or recessed portions which are the same in opposite directions (opposite in thickness) (Fig. 5).

The fuel cell separator manufactured through the present invention can realize a shape that can not be realized in a separator manufactured using a conventional carbon composite composition.

As shown in Fig. 5, the general carbon composite separator is formed into a structure having protrusions or recesses that are the same in opposite directions (opposite in thickness), and the general metal separator plates are formed in the opposite direction (A structure in which protrusions and recesses are arranged in the channel direction) having different protrusions and recesses.

However, the separator according to the present invention may have a structure of a metal separator in addition to the general channel structure of the carbon composite separator.

The fuel cell bipolar plate manufactured by the above-described manufacturing method can exhibit excellent mechanical strength and gas tightness while being thin.

The present invention also provides a fuel cell comprising the fuel cell bipolar plate and a fuel electrode (anode) and a cathode (cathode) arranged to face each other with the separator interposed therebetween.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

[ Manufacturing example : Manufacture of fuel cell separator]

< Example  1>

A stainless steel (SUS) thin plate having a thickness of 0.05 mm was prepared as a thin metal plate.

An epoxy resin, a curing agent, a curing accelerator and expanded graphite were mixed to prepare a carbon composite composition, and the carbon composite composition was coated on the thin stainless steel sheet.

The metal foil coated with the carbon composite material was passed through a roller heated at 150 ° C at a speed of 30 m / s and compression molded to produce a fuel cell separator.

< Example  2 to 4, Comparative Example  1 to 2>

The thickness of the metal thin plate, and the carbon composite composition were used as shown in Table 1 below.

Example 1 Example 2 Example 3 Example 4 Thin metal plate thickness ^{1 )} 0.05 mm 0.1 mm 1.5 mm 0.1 mm Carbon complex Thermosetting resin ^{2 )} 20 20 20 10 Thermoplastic resin ^{3 )} - - - 10 Carbon material ^{4 )} 70 70 70 70 Other additives ^{5 )} 10 10 10 10 Separator plate thickness 0.1 mm 0.15 mm 1.5 mm 0.15 mm

(Unit: weight ratio based on 100 parts by weight of carbon composite layer)

1) Thin metal plate: Stainless steel (SUS)

2) Thermosetting resin: A liquid mixture of an epoxy resin, a curing agent and a curing accelerator

3) Thermoplastic resin: Polypropylene (PP)

4) Carbon material: expanded graphite

5) Other additives: internal brothers, water festival

[ Experimental Example  1: Measurement of sealing performance of fuel cell separator]

The gas tightness of the fuel cell bipolar plates prepared in the above Examples and Comparative Examples was measured.

Example 1 Example 2 Example 3 Example 4 Split plate thickness (mm) 0.1 0.15 1.5 0.15 Gas tightness (cc / min) No Leak No Leak No Leak No Leak

It is general that the gas-tightness is not ensured at a thickness of 0.5 mm or less in a separator produced using a carbon composite composition containing a thermosetting resin and a thermoplastic resin. Further, if the content of the thermosetting resin and the thermoplastic resin in the carbon composite composition is increased in order to ensure the gas tightness, the gas tightness can be ensured, but the electric conductivity characteristic applicable to the fuel cell can not be obtained.

However, referring to Table 2, it was confirmed that the gas tightness is secured even if the thickness of the fuel cell separator according to the embodiment of the present invention is as thin as 0.1 mm.

The present invention can manufacture a thin plate fuel cell bipolar plate which is thinly manufactured while having durability, light weight, and high hermeticity of the fuel cell bipolar plate.

[ Experimental Example  2: Measurement of durability of fuel cell separator]

Example 1 Example 2 Example 3 Example 4 Internal characteristic
(Degree of penetration of acidic substance) 0 0 0 0

 (Unit: 0: Not permeable to 10: Corrosion due to penetration)

In order for the fuel cell separator to have high durability, the acidic substance generated in the fuel cell operating condition must not penetrate to the metal thin plate through the carbon composite composition coated on the surface.

When the expanded graphite was used as the carbon material, it was confirmed that the durability was excellent when the content of the thermosetting resin and the thermoplastic resin was 20 wt% with respect to the total weight of the carbon composite material.

It was confirmed that the durability of the fuel cell separator according to Examples 1 to 4 of the present invention was improved by controlling the content of the thermosetting resin and the thermoplastic resin in the carbon composite composition.

[ Manufacturing example  2: Fuel cell separator flow path structure]

FIG. 4 shows a flow path structure formed using the fuel cell bipolar plate according to the first embodiment of the present invention, and FIG. 5 shows a flow path structure of a general carbon composite material.

4 and 5, it was confirmed that the fuel cell separator manufactured through the present invention can realize a shape that can not be realized in a separator manufactured using the existing carbon composite composition.

Particularly, there is an advantage that a shape of a fuel cell separator applicable to a fuel cell vehicle can be realized, and a general flow path shape of a metal separator can be realized. In addition, since the carbon composite composition coated on the surface of the metal thin plate has a corrosive property with a weak metal, it protects the metal, so that it has corrosion resistance and can maintain high conductivity characteristics.

[ Experimental Example  3: Measurement of electrical conductivity of fuel cell separator]

The electrical conductivities of the fuel cell separators prepared in the above Examples and Comparative Examples were measured.

The average electrical conductivity was evaluated using the resistance values measured by a 4-point probe. The results are shown in Table 4 below.

Example 1 Example 2 Example 3 Example 4 Electrical Conductivity (s / cm) 120 120 120 110

Referring to Table 4, in the carbon composite composition according to the present invention, the separator prepared by adding the thermosetting resin had a conductivity of about 120 s / cm, and the separator prepared by adding the thermoplastic resin had electric conductivity of about 100 s / cm Respectively.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

100: Fuel cell separator plate
110: metal foil
120: carbon composite layer
130: adhesive layer
140: Rollers
200: fuel cell separator plate

Claims (12)

Metal foil, and
And a carbon composite layer positioned on at least one side of the thin plate,
The carbon composite material layer includes a carbon material and a polymer material,
Wherein the polymer material includes any one selected from the group consisting of a thermosetting resin, a thermoplastic resin, and a mixture thereof
Fuel cell separator. The method according to claim 1,
Wherein the thermosetting resin is any one selected from the group consisting of a phenol resin, an epoxy resin, and a mixture thereof,
Wherein the thermosetting resin is contained in an amount of 10 to 30% by weight based on the total weight of the carbon composite material layer. The method according to claim 1,
The thermoplastic resin may be selected from the group consisting of polypropylene (PP), polyphenylenesulfide (PPS), polyvinylidene fluoride (PVDF), fluorinated ethylene propylene (FEP), perfluoroalkoxy , PFA), and mixtures thereof.
Wherein the thermoplastic resin is contained in an amount of 10 to 30% by weight based on the total weight of the carbon composite material layer. The method according to claim 1,
Wherein the polymer material further comprises a curing agent and a curing accelerator. The method of claim 1, wherein
The metal thin plate is any one selected from the group consisting of aluminum, copper, carbon foil, titanium, iron, stainless steel (SUS), nickel, cobalt,
The thickness of the metal thin plate is 0.04 to 0.3 mm,
Wherein the metal thin plate surface is plasma-treated. The method according to claim 1,
Wherein the carbon material is any one selected from the group consisting of natural graphite, graphite impression, expanded graphite, artificial graphite, carbon black, graphene, carbon fiber and mixtures thereof,
Wherein the carbon material has a particle size of 5 to 300 mu m. The method according to claim 1,
Wherein the fuel cell separator further comprises an adhesive layer between the thin metal plate and the carbon composite material layer,
Wherein the adhesive layer comprises the polymer material. The method according to claim 1,
Wherein the fuel cell separator has a thickness of 0.1 to 1.5 mm,
A gas permeability of 1 X 10 ^-6 to 2 X 10 ^-6 cm ³ / cm ² sec,
A flexural strength of 50 to 120 MPa, a density of 0.8 to 2.2 g / mL, and an electrical conductivity of 80 to 250 S / cm. The method according to claim 1,
Wherein the fuel cell separator is applied to any one selected from the group consisting of a direct methanol fuel cell (DMFC), a polymer electrolyte fuel cell (PEMFC), and a phosphoric acid fuel cell (PAFC). Applying a carbon composite composition on a metal foil, and
Passing the thin metal sheet coated with the carbon composite composition to a roller heated at 140 to 160 DEG C at a speed of 1 to 30 m / s to perform compression molding,
Wherein the carbon composite material composition comprises a carbon material and a polymer material,
Wherein the polymer material is any one selected from the group consisting of a thermosetting resin, a thermoplastic resin, and a mixture thereof. 11. The method of claim 10,
The compression molding implements a flow path shape,
Wherein the flow path shape is a structure (a structure in which protrusions and recessed portions are arranged in a channel direction) having protrusions and recesses that are different from each other in the opposite direction (thickness opposite direction). 11. The method of claim 10,
Further comprising the step of applying the polymer material to the thin metal plate to form an adhesive layer before the step of applying the carbon composite composition on the thin metal plate.

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