KR20170064372A - A grapheme-based polymer complexed bipolar plate and method for preparing the same - Google Patents

Abstract

TECHNICAL FIELD The present invention relates to a graphene-based polymer nanocomposite bipolar plate and a method of manufacturing the same, and more particularly, to a graphene-based polymer nanocomposite bipolar plate having a graphene- The present invention relates to a pin-based polymer nanocomposite bipolar plate and a manufacturing method thereof.
According to the graphene-based polymer nanocomposite bipolar plate and vanadium redox flow cell of the present invention, it is possible to penetrate the functionalized vegetable resin between the layers of graphene to improve the dispersibility of graphene, Is advantageous. According to the manufacturing method of the present invention, the electrical conductivity can be improved by using the excellent conductivity and the large aspect ratio of graphene, the content of the filler can be reduced, and the viscosity of the resin can be lowered. So that the processability and dimensional stability are excellent.

Description

The present invention relates to a graphene-based polymer complexated bipolar plate and a method for preparing the same,

TECHNICAL FIELD The present invention relates to a graphene-based polymer nanocomposite bipolar plate and a method of manufacturing the same, and more particularly, to a graphene-based polymer nanocomposite bipolar plate having a graphene- The present invention relates to a pin-based polymer nanocomposite bipolar plate and a manufacturing method thereof.

Recently, Redox Flow Battery (RFB) has attracted attention as environmentally friendly renewable energy storage technology such as solar energy.

Due to the depletion of petroleum resources around the world, many efforts have been made to redox flow cells to secure energy resources. New and renewable energy systems such as solar power, wind power, and tidal power are affected by location conditions and terrain, and there are various problems such as inefficient space securing. Despite the environment friendly system, it has not achieved remarkable development. The need for the development of alternative energy sources has emerged.

Lithium-ion batteries, sodium-sulfur batteries, redox-flow batteries, ultra-high-capacity capacitors and lead-acid batteries have been developed as large-capacity power storage systems. The power storage system using a secondary battery has reached the stage of practical use and has attracted attention as a medium to promote the spread and expansion of existing renewable energy sources. Actually, lead-acid batteries have attracted much attention as large-capacity energy storage devices, but they have not been applied due to problems such as low energy density and life span. Therefore, attention has been focused on technologies such as redox flow cell to solve this problem.

The redox flow cell is a promising energy storage system that has been extensively researched in NASA in the United States, NSWU (New South Wales University in Australia) and Japan's electro technical laboratory (ETL). In addition, the Canadian VRB Power system has succeeded in commercialization of the 5kW ESS, and the power generation is gradually increasing. Currently, the VRB power system is operating the 2MW VRB system.

The redox flow cell is a combination of the words Reduction, Oxidation, and Flow, meaning a cell that stores energy using the reduction / oxidation potential difference of an electrolyte through a water-soluble electrolyte having metal ions do. Especially, the redox flow battery is a storage system with a possibility of future development because it is easy to increase the capacity of the battery and has various conditions necessary for long time use.

The redox flow battery is classified into V / Br, Zn / Br and V / V depending on the redox couple. Among them, the vanadium redox flow battery (VRFB) Since the same kinds of redox materials can be used for the positive electrode and the negative electrode, much research has been conducted in comparison with other redox flow cells.

   Studies on VRFB have been actively conducted mainly on electrode modification, ion exchange membrane, and large capacity stack manufacturing. Such a VRFB system requires an ion exchange membrane because it uses electrolyte as a carrier medium. In the anode and the cathode, the electrolyte is oxidized with the cation exchange membrane interposed therebetween to generate H + ions and electrons, and the generated H + ions are transmitted to the cathode through the ion exchange membrane, and electrons flow through the external conductor.

The core material of VRFB is an ion exchange membrane, which is an important factor for determining the lifetime and manufacturing cost of the battery. In order to apply the present invention to a system using a strongly acidic substance containing an actual transition metal as an electrolytic solution, it is required to have excellent acid resistance and oxidation resistance, low permeability and excellent mechanical properties.

However, expensive ion exchange membranes such as Nafion of Dupont, which is currently being commercialized as an ion exchange membrane, have a great influence on the actual cell driving and have been pointed out as a cause of increasing the price of the battery.

These ion exchange membranes have low ion selectivity due to the porous structure and low durability. In the case of perfluorinated polymer membranes such as Nafion membranes, ion exchange membranes of VFRB systems are used due to their high ionic conductivity and excellent chemical stability, but they are inferior in price competitiveness.

Registered Patent No. 10-1262664 (Registered on May 3, 2013)

The present inventors have completed the present invention by including a polymer-graphite composite having a vegetable resin containing a carboxyl group between oxidized graphene layers as a result of efforts to solve all the disadvantages and problems of the prior art.

Accordingly, an object of the present invention is to provide a graphene-based polymer nanocomposite bipolar plate having excellent electrical conductivity.

Another object of the present invention is to provide a vanadium redox flow cell comprising a graphene-based polymer nanocomposite bipolar plate having excellent electrical conductivity.

Another object of the present invention is to provide a method for producing a graphene-based polymer nanocomposite bipolar plate having excellent electrical conductivity and excellent processability and dimensional stability of a polymer-graphite composite.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides a graphene-based polymer nanocomposite bipolar plate including a polymer-graphite composite having a vegetable resin containing a carboxyl group between sheet-like oxide graphene layers.

In a preferred embodiment, the vegetable resin is a vegetable resin having a triglyceride structure.

In a preferred embodiment, the oxidized graphene is an oxidized graphene reduced through heat treatment.

In order to achieve the above object, the present invention also provides a vanadium redox flow cell comprising the oxide graphene nanocomposite bipolar plate.

In order to achieve the above object, the present invention also provides a method of manufacturing a semiconductor device, Introducing a functional group into the vegetable resin to modify it; Mixing the oxidized graphene and the modified vegetable resin to prepare a modified mixture; And the modified mixture Graphite composite, wherein the polymer-graphite composite is prepared by mixing graphite and graphite, and polymerizing the graphite with an initiator to produce a polymer-graphite composite, wherein the polymer- Based polymer nanocomposite bipolar plate.

In a preferred embodiment, the method further comprises molding the polymer-graphite composite using a silicone mold.

In a preferred embodiment, the step of preparing the oxidized graphene comprises: stirring a first mixture of graphite and sulfuric acid; Stirring a first mixture and a second mixture comprising potassium permanganate; Adding hydrogen peroxide to the second mixture to produce oxidized graphene; And neutralizing the oxidized graphene with distilled water and drying the oxidized graphene powder to prepare an oxidized graphene powder.

In a preferred embodiment, the method further comprises heat treating the oxidized graphene powder.

In a preferred embodiment, the step of introducing a functional group into the vegetable resin to modify it is carried out by introducing a carboxyl group into the vegetable resin having a triglyceride structure.

In a preferred embodiment, the step of introducing a functional group into the vegetable resin and modifying the functional group comprises: preparing a vegetable resin solution by dissolving hydroquinone in an acrylated epoxidized soybean oil (AESO) step; And dissolving maleic anhydride in the vegetable resin solution and adding a dimethylbenzylamine (N, N-dimethylbenzylamine) catalyst.

In a preferred embodiment, the step of dissolving maleic anhydride in the vegetable resin solution and stirring it with a dimethylbenzylamine (N, N-dimethylbenzylamine) catalyst stops the reaction before gelation.

In a preferred embodiment, the step of preparing the modified mixture comprises mixing and stirring the polymerizable monomer with the modified vegetable resin, and then adding the graphene oxide and stirring.

In a preferred embodiment, the polymerizable monomer is selected from the group consisting of styrene, vinyltoluene,? -Methylstyrene, acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, Acrylates such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, dimethylaminoethyl methacrylate, acrylonitrile, methacrylonitrile, acrylamide, methacrylamide , Ethylenically unsaturated monoolefins of ethylene, propylene and butylene, vinyl chloride, vinylidene chloride, vinyl halides of vinyl fluoride, vinyl acetate, vinyl esters of vinyl propionate, vinyl methyl ether, vinyl ethyl ether of vinyl ethyl ketone, , Methyl isopropenyl ketone, 2-vinylpyridine, 4-vinylpyridine and N-vinylpyrrolidone. to be.

In a preferred embodiment, the polymerizable monomer comprises 3 to 50 parts by weight based on the total weight of the composition.

In a preferred embodiment, the graphene oxide is added and stirred, and then the graphene oxide is dispersed through ultrasonic treatment.

In a preferred embodiment, the step of producing the polymer-graphite composite performs a nitrogen purge process for removing air bubbles.

The present invention has the following excellent effects.

First, according to the graphene-based polymer nanocomposite bipolar plate and vanadium redox flow cell of the present invention, functionalized resin can permeate between the layers of oxidized graphene to improve the dispersibility of graphene, And has an advantage of being superior in electric conductivity.

Further, according to the production method of the present invention, it is possible to improve electric conductivity by using high specific surface area of graphene, reduce the content of filler, lower the viscosity of resin, and make bipolar plate using silicone mold Therefore, there is an effect that the processability and the dimensional stability are excellent.

FIG. 1 is a process diagram illustrating a method of manufacturing a graphene-based polymer nanocomposite bipolar plate according to an embodiment of the present invention. Referring to FIG.
2 is a photograph showing the dispersibility of graphene in a vegetable resin prepared according to an embodiment of the present invention.
3 is a graph showing FT-IR measurement results of vegetable resin prepared according to an embodiment of the present invention.
4 is an XRD measurement result showing the change in interlayer distance of the graphene oxide in the polymer-graphite composite produced according to the embodiment of the present invention.
5 is a TEM photograph showing an improvement in the dispersibility of graphene in a polymer-graphite composite produced according to an embodiment of the present invention.
6 is a graph showing the electrical conductivity of a polymer-graphite composite prepared according to an embodiment of the present invention.

Although the terms used in the present invention have been selected as general terms that are widely used at present, there are some terms selected arbitrarily by the applicant in a specific case. In this case, the meaning described or used in the detailed description part of the invention The meaning must be grasped.

Hereinafter, the technical structure of the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like reference numerals used to describe the present invention throughout the specification denote like elements.

FIG. 1 is a process diagram illustrating a method of manufacturing a graphene-based polymer nanocomposite bipolar plate according to an embodiment of the present invention. Referring to FIG.

The present invention provides a graphene-based polymer nanocomposite bipolar plate having excellent electrical conductivity by including a polymer-graphite composite in which a vegetable resin containing a carboxyl group is sandwiched between plate-shaped oxide graphene layers, and a method for manufacturing the same. Feature. Accordingly, the method for producing a polymer nanocomposite bipolar plate of the present invention comprises the steps of preparing graphene oxide, modifying the graphene graft by introducing a functional group into the vegetable resin, modifying the graphene graphene and the modified vegetable resin by modifying Preparing a polymer-graphite composite by mixing the modified mixture with graphite, and polymerizing the mixture with an initiator to form a polymer-graphite composite; and molding the polymer-graphite composite using a silicone mold .

Referring to FIG. 1, a step of preparing graft oxide and a step of introducing a functional group into a vegetable resin are carried out, respectively.

Various methods can be used as the method for producing the graphene oxide. In the embodiment of the present invention, graphite, sulfuric acid and potassium permanganate are stirred, neutralized and dried to prepare an oxidized graphene powder.

The first mixture in which graphite and sulfuric acid are mixed is stirred, and the second mixture in which potassium permanganate is mixed in the first mixture is stirred. Then, hydrogen peroxide is added to the second mixture to prepare oxidized graphene. The prepared graphene oxide is neutralized with distilled water, and then an aqueous solution of graphene oxide is filtered through a filter paper, and then the resultant is placed in an oven and dried to prepare an oxidized graphene powder. At this time, heat treatment (100 ° C) may be performed to reduce the conductivity of the graphene oxide, and the reduced graphene oxide powder may be used as a conductive filler.

On the other hand, with the step of preparing the graphene oxide, a step of introducing a functional group into the vegetable resin to carry out the step of modifying it.

Modification of the vegetable resin is carried out by introducing a carboxyl group into a vegetable resin having a triglyceride structure. The fatty acid having such a triglyceride structure may be a saturated fatty acid or an unsaturated fatty acid having 2 to 80 carbon atoms and 0 to 6 double bonds.

In an embodiment of the present invention, a method of chemically introducing a functional group into a vegetable resin, that is, a maleate-forming method, may be used to modify an actual physical resin. A method for producing a vegetable resin solution by dissolving hydroquinone in an acrylated epoxided soybean oil (AESO), dissolving maleic anhydride in the vegetable resin solution, adding dimethylbenzylamine (N, N-dimethylbenzylamine) catalyst is added and stirred to modify the vegetable resin. At this time, it is preferable that the step of adding the dimethylbenzylamine (N, N-dimethylbenzylamine) catalyst and stirring is stopped before the gelation.

Next, the step of mixing the oxidized graphene and the modified vegetable resin to prepare a modified mixture is carried out.

First, the polymerizable monomer is mixed with the modified vegetable resin and stirred.

The polymerizable monomer may be at least one monomer selected from the group consisting of styrene monomers such as styrene, vinyl toluene and? -Methyl styrene, acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, Acrylates such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, dimethylaminoethyl methacrylate, acrylonitrile, methacrylonitrile, acrylamide and methacrylamide (Meth) acrylic acid, ethylenically unsaturated monoolefins such as ethylene, propylene and butylene, vinyl halides such as vinyl chloride, vinylidene chloride and vinyl fluoride, vinyl esters such as vinyl acetate and vinyl propionate and the like, , Vinyl ethers such as vinyl methyl ether and vinyl ethyl ether, vinyl ketones such as vinyl methyl ketone and methyl isopropenyl ketone, And nitrogen-containing vinyl compounds such as vinylpyridine, 4-vinylpyridine and N-vinylpyrrolidone can be used.

Preferably, the polymerizable monomer is mixed in an amount of 3 to 50 parts by weight based on the total weight of the composition. The graphene oxide is added and stirred, and then the graphene oxide is dispersed through ultrasonic treatment.

Subsequently, the modified mixture is mixed with graphite and polymerized using an initiator to prepare a polymer-graphite composite.

As the initiator, a peroxide initiator may be used, and phosphorus 3% tert-butyl peroxy benzoate is added and purged with nitrogen to remove oxygen which inhibits the radical reaction.

Finally, the polymer-graphite composite is molded using a silicone mold to complete a graphene-based polymer nanocomposite bipolar plate.

The graphene-based polymer nanocomposite bipolar plate manufactured through the method of manufacturing a graphene-based polymer nanocomposite bipolar plate according to an embodiment of the present invention has a carboxyl group in which graphene grains are dispersed among plate- And a polymer-graphite composite having a vegetable resin contained therein.

At this time, the oxidized graphene is oxidized graphene reduced through heat treatment, and the vegetable resin is a vegetable resin having a triglyceride structure.

As described above, according to the method of manufacturing a graphene-based polymer nanocomposite bipolar plate according to an embodiment of the present invention, the electrical conductivity can be improved by using the excellent conductivity and the large aspect ratio of graphene, Can be reduced and the viscosity of the resin can be lowered. Thus, bipolar plates can be manufactured using a silicone mold, which is excellent in workability and dimensional stability.

According to the graphene-based polymer nanocomposite bipolar plate and vanadium redox flow cell manufactured according to the embodiment of the present invention, the functionalized resin can permeate between the layers of graphene to improve the dispersibility of graphene , Which is superior in electrical conductivity to the existing composite.

Example 1

Preparation of oxidized graphene

2 g of graphite and 100 ml of sulfuric acid are mixed and stirred, and then potassium permanganate is added. Potassium permanganate is added so that the ratio of graphite and potassium permanganate is 2: 7. After stirring the mixture for 12 hours, add 50 ml of water and stir thoroughly for 5 minutes. After that, 10 ml of hydrogen peroxide is added to obtain graphene oxide having an ocher color. Since the oxidized graphene is acidified here, the oxidized graphene is neutralized through distilled water and dried at room temperature to form oxidized graphene powder. In order to recover the conductivity of the graphene oxide, a reduced oxidized graphene powder was prepared for use as a conductive filler by heat treatment at 100 ° C.

By introducing functional groups through chemical reactions in vegetable resins,

0.05 g of hydroquinone is completely dissolved in 50 g of acrylated epoxided soybean oil (AESO), a vegetable resin. Maleic anhydride is mixed with the mixture according to different molar ratios as shown in [Table 1] and stirred until completely dissolved. At this time, after adding 1 g of dimethylbenzylamine as a catalyst, the reaction is stopped before the mixture is gelled.

AESO Maleic anhydride Molar ratio 1: 1 50g 4.085 g Molar ratio 1: 2 50g 8.17 g Molar ratio 1: 3 50g 12.255g

Oxidized graphene Reformed Vegetable resin  mix

A polymerizable monomer for lowering the viscosity of the vegetable resin and the vegetable resin is added and stirred, and then graphene oxide is added and stirred. That is, a vegetable resin and styrene, which is a polymerizable monomer, were mixed in a ratio of 2: 1 and 3 wt% of oxidized graphene was added to prepare a mixture. At this time, it is necessary to prevent the polymerizable monomer from evaporating during the stirring. To disperse the oxidized graphene, the graphene oxide is dispersed by ultrasonic treatment for 5 to 10 minutes and agitated sufficiently for 24 hours.

2 is a photograph showing the dispersibility of graphene in a vegetable resin prepared according to an embodiment of the present invention.

Referring to FIG. 2, the dispersibility of graphene in the modified vegetable resin and styrene mixture can be confirmed. Here, it was confirmed that the dispersibility of the modified vegetable resin at the molar ratio of 1: 3, which has a high reaction ratio of vegetable resin and maleic anhydride, is the best.

3 is a graph showing FT-IR measurement results of vegetable resin prepared according to an embodiment of the present invention. Here, modified vegetable resins were prepared by different molar ratios (1: 1, 1: 2, 1: 3) and analyzed by FT-IR measurement using KBr window.

Referring to FIG. 3, as the molar ratio of maleic anhydride in the maleation reaction increases, the C═O stretching vibration peak appearing in the 1730 to 1700 (cm ^-1 ) wavelength region and the 1320 to 1000 (cm ^-1 ) It is confirmed that the CO stretching vibration peak increases. As a result, it can be confirmed that a carboxyl group is introduced into the vegetable resin.

4 is an XRD measurement result showing the change in interlayer distance of the graphene oxide in the polymer-graphite composite produced according to the embodiment of the present invention. The mixture of the modified vegetable resin and the oxidized graphene was stirred for 48 hours or more and analyzed by XRD.

Referring to FIG. 4, it can be seen that as the molar ratio of maleic anhydride in the maleation reaction increases, the shift of the XRD peak of the graphene oxide occurs. This is due to the calculation of Bragg reaction (nλ = 2dsinθ) It can be seen that as the molar ratio of maleic anhydride in the rate reaction increases, the spacing between the layers of oxidized graphene increases.

When the graphene powder is prepared by the chemical stripping method, the gap between the graphene layers increases from 0.34 nm to 0.83 nm. Here, oxidized graphene is not complete graphene, and graphene refers to one layer of graphite that is completely peeled off. It was confirmed that the modified vegetable resin was permeated between the layers to completely separate the graphene, thereby increasing the gap between the layers of the oxidized graphene from 0.83 nm to 1.27 nm. In other words, graphene can be completely peeled off through polymerization of modified vegetable resin permeated between layers, and it is possible to improve the dispersibility of graphene through effective peeling of graphene in the polymer matrix, (The percolation value refers to the lowest filler content that provides electrical conductivity in the polymer composite).

The mixture was mixed with graphite and polymerized using a peroxide initiator

Graphene is blended again with the finely dispersed vegetable resin and graphite at different ratios. After adding the peroxide initiator 3% tert-butyl peroxy benzoate to the well-stirred mixture, transfer the mixture to the silicon mold. Then, the air bubbles were removed by purging with nitrogen to remove bubbles (oxygen) in the vegetable resin that inhibits the radical reaction. The mixture was polymerized in an oven at 100 ° C. for 6 hours and post-cured at 150 ° C. for 2 hours to prepare a graft-nanocomposite polymer-graphite composite. Here, the polymerization reaction of vegetable resin is free radical polymerization.

Preparation of bipolar plate according to the content of conductive filler

A bipolar plate based on vegetable resin was prepared by mass fraction as shown in [Table 2]. AESO-rGO60 is a vegetable resin composite bipolar plate having an artificial graphite content of 59% and a graphene content of 1%. MAESO-rGO60 is a modified vegetable resin composite bipolar plate having an artificial graphite content of 59% and a graphene content of 1%. AESO-rGO70 and MAESO-rGO70 are composite bipolar plates with an artificial graphite content of 69% and a graphene content of 1%, respectively.

AESO Graphene (rGO) Artificial graphite Surface electrical resistance AESO-rGO60 40% One% 59% 1900 mohm · cm MAESO-rGO60 40% One% 59% 950 mohm · cm AESO-rGO70 30% One% 69% 250 mohm · cm MAESO-rGO70 30% One% 69% 150 mohm · cm

5 is a TEM photograph showing an improvement in the dispersibility of graphene in a polymer-graphite composite produced according to an embodiment of the present invention. The polymer-graphite composite, which is a composite material of the modified vegetable resin and graphene, was cut through a microtome to a thickness of 50-100 nm and subjected to TEM analysis.

Referring to FIG. 5, it is confirmed that the reduced graphene grains are relatively uniformly dispersed in the modified vegetable resin. That is, it can be confirmed that the hydrophilic functional group is introduced into the vegetable resin which can easily introduce the functional group, thereby improving the dispersibility of the oxidized graphene in the polymer.

Comparative Example  One

A graphene-epoxy composite bipolar plate was prepared using the oxidized graphene powder reduced in the same manner as in Example 1. And stirred for 24 hours in order to disperse the graphene in the epoxy resin. The mixture was transferred to a silicone mold, cured at 100 ° C for 3 hours, and post cured at 170 ° C for 3 hours to prepare a graphene-epoxy composite bipolar plate. EPOXY-G60 is a composite bipolar plate with a graphite content of 59% and a graphene content of 1%. EPOXY-rGO70 is a composite bipolar plate with a graphite content of 69% and a graphene content of 1%. Epoxy-based graphene bipolar plates were prepared using the same mass fractions as in Table 3.

EPOXY Graphene (rGO) Artificial graphite Surface electrical resistance EPOXY-rGO60 39% One% 60% 2750 mohm · cm EPOXY-rGO70 29% One% 70% 270 mohm · cm

In Table 2 and Table 3, the electrical resistivities of composite materials with filler content of 60% are two times lower than those of composites using epoxy and vegetable resins, . As a result, it can be seen that the processability and dimensional stability of the composite material can be improved by reducing the content of the resin to produce the composite material. Also, it can be confirmed that the electrical resistance of the modified vegetable resin is lowest even in the composite material having the filler content of 70%.

6 is a graph showing the electrical conductivity of a polymer-graphite composite prepared according to an embodiment of the present invention.

Referring to FIG. 6, it can be seen that the electrical resistance of the polymer-graphite composite prepared according to the embodiment of the present invention was significantly lower than the electrical resistance of the epoxy composite material prepared according to Comparative Example 1. This result means that the electrical conductivity of the graphene-based polymer nanocomposite bipolar plate by the polymer-graphite composite prepared according to the embodiment of the present invention is remarkably improved. In particular, the electrical properties of MAESO-rGO70 are remarkably improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the present invention. Various changes and modifications may be made by those skilled in the art.

Claims (16)

A graphene-based polymer nanocomposite bipolar plate comprising a polymer-graphite composite having a vegetable resin containing a carboxyl group between plate-shaped oxide graphene layers. The method according to claim 1,
Wherein the vegetable resin is a vegetable resin having a triglyceride structure, wherein the graphene-based polymer nanocomposite bipolar plate is a graphene-based polymer nanocomposite bipolar plate. 3. The method of claim 2,
Wherein the graphene oxide is a graphene oxide reduced through heat treatment. 2. The graphene-based polymer nanocomposite bipolar plate according to claim 1, wherein the graphene oxide is graphene oxide reduced through heat treatment. A vanadium redox flow cell comprising the oxide graphene nanocomposite bipolar plate according to any one of claims 1 to 3. Producing oxidized graphene;
Introducing a functional group into the vegetable resin to modify it;
Mixing the oxidized graphene and the modified vegetable resin to prepare a modified mixture; And
Mixing the modified mixture with graphite, and polymerizing the mixture with an initiator to prepare a polymer-graphite composite,
Wherein the polymer-graphite composite is prepared by dispersing the graphene oxide in the modified vegetable resin. 6. The method of claim 5,
And forming the polymer-graphite composite by using a silicone mold. The method of manufacturing a graphene-based polymer nanocomposite bipolar plate according to claim 1, 6. The method of claim 5,
The step of preparing the graphene oxide
Stirring the first mixture of graphite and sulfuric acid;
Stirring a first mixture and a second mixture comprising potassium permanganate;
Adding hydrogen peroxide to the second mixture to produce oxidized graphene; And
And neutralizing the oxidized graphene with distilled water and drying the oxidized graphene powder to prepare a graphene-based polymer nanocomposite bipolar plate. 8. The method of claim 7,
And heat treating the graphene oxide powder. The method of manufacturing a graphene-based polymer nanocomposite bipolar plate according to claim 1, 9. The method according to any one of claims 5 to 8,
Wherein the step of introducing a functional group into the vegetable resin and modifying the functional group comprises introducing a carboxyl group into a vegetable resin having a triglyceride structure to modify the graft-based polymer nanocomposite bipolar plate. 10. The method of claim 9,
The step of introducing a functional group into the vegetable resin to modify it
Preparing a vegetable resin solution by dissolving hydroquinone in an acrylated epoxided soybean oil (AESO); And
(B) dissolving maleic anhydride in the vegetable resin solution and adding a dimethylbenzylamine (N, N-dimethylbenzylamine) catalyst and stirring the resultant mixture. 11. The method of claim 10,
The step of dissolving maleic anhydride in the vegetable resin solution and adding a dimethylbenzylamine (N, N-dimethylbenzylamine) catalyst and stirring the resultant solution stops the reaction before gelation. The graphene-based polymer nanocomposite bipolar plate Gt; 9. The method according to any one of claims 5 to 8,
The step of preparing the modified mixture
Wherein the polymeric monomer is mixed with the modified vegetable resin and stirred, and the graphene oxide graphene is added thereto, followed by stirring, thereby producing a graphene-based polymer nanocomposite bipolar plate. 13. The method of claim 12,
The polymerizable monomer may be at least one member selected from the group consisting of styrene, vinyltoluene,? -Methylstyrene, acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, Acrylates such as ethyl acrylate, propyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, dimethylaminoethyl methacrylate, acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, ethylene, Vinylidene chloride, vinylidene chloride, vinyl halides of vinyl fluoride, vinyl acetate, vinyl esters of vinyl propionate, vinyl methyl ether, vinyl ethyl ether of vinyl ethyl ether, vinyl methyl ketone, methyl isopropenyl ketone , 2-vinylpyridine, 4-vinylpyridine, and N-vinylpyrrolidone. (Manufacturing method of pin - based polymer nanocomposite bipolar plate).
14. The method of claim 13,
Wherein the polymerizable monomer is 3 to 50 parts by weight based on the total weight of the composition. 15. The method of claim 14,
Wherein the graphene oxide nanoparticle-based bipolar plate is prepared by mixing and agitating the graphene oxide and then dispersing the graphene oxide by ultrasonic treatment. 9. The method according to any one of claims 5 to 8,
Wherein the step of preparing the polymer-graphite composite comprises performing a nitrogen purge step to remove bubbles. The method of manufacturing a graphene-based nanocomposite bipolar plate according to claim 1,

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