KR102524222B1 - Carbon-based Paper Electrode with Micro Channel for Redox Flow Battery, and Method of Manufacturing the Same - Google Patents

Abstract

A carbon electrode structure having a microchannel for a redox flow battery and a manufacturing method thereof are disclosed. Carbon material-based electrodes include carbon fibers and carbon nanotubes such as carbon paper and bucky paper. The channel formation of the carbon material-based electrode has a micro-size to improve the reaction specific surface area and reduce the flow resistance. It may be formed by stacking the paper on which the channels are formed in multi-layers. The carbon material-based electrode may have channels of various shapes such as rectangular and curved. The microchannel can be processed using a roll to roll method using a micro gear, a mold processing method using a mold in the form of a rack gear, or a processing method using a laser beam. A surface coating, adhesion or stitching process for structural integrity of the multi-microchannel carbon material-based electrode may be included.

Description

Carbon-based Paper Electrode with Micro Channel for Redox Flow Battery, and Method of Manufacturing the Same}

The present invention relates to a large-capacity redox flow battery, and more particularly, to a structure and manufacturing method of a curved carbon electrode for a redox flow battery.

As the demand for greenhouse gas reduction increases according to environmental regulations worldwide, interest in renewable energy that does not use fossil fuels is increasing. However, renewable energies such as photovoltaic and wind power generation have a disadvantage in that the production of energy is not constant due to the influence of the location environment or natural environment. To solve this problem, an energy storage system can be introduced to store irregularly generated energy and supply energy stably in line with market demand.

Energy storage devices include lead acid batteries, NaS batteries, lithium ion batteries, redox flow batteries, and the like. Among them, lithium ion batteries have a high risk of explosion, while vanadium redox flow batteries (VRFB) have advantages of low risk of explosion, independent electric capacity and output, and long lifespan, making them suitable for next-generation energy It is gaining attention as a storage system.

1 schematically shows a VRFB system. As known, the VRFB system is a secondary battery that uses an aqueous vanadium solution as an anode electrolyte and a cathode electrolyte, and is charged while a potential difference between the electrolytes is generated through their oxidation-reduction reaction and discharged while the potential difference between the electrolytes is reduced. In the battery cell, a space between first and second current collectors disposed to face each other is bisected by an ion-selective membrane, and a porous electrode is provided in the bisected space. placed in each The first tank containing the positive electrolyte and the second tank containing the negative electrolyte are connected to the first and second electrode spaces where the two electrodes are disposed through first and second circulation pipes, respectively. First and second pumps are respectively connected to the ducts of the first and second circulation pipes. The first pump pumps the anode electrolyte to circulate between the first tank and the first electrode space, and the second pump also pumps the cathode electrolyte to circulate it between the second tank and the second electrode space.

In VRFB, in particular, porous electrodes are one of the important parts that directly affect the performance of redox flow batteries, and research is being actively conducted to develop electrodes with long lifespan and high efficiency.

The redox flow battery has a driving principle in which oxidation-reduction occurs on the surface of the electrode after the electrolyte is moved into the electrode by a pump. Therefore, the electrode requires high electrical conductivity to move electrons necessary for the reaction while having excellent reactivity. In addition, due to the characteristics of a redox flow battery operated in a strong acid environment, the electrode material must be able to maintain chemical durability for a long time.

To meet these characteristics, carbon materials are applied, and carbon felt, which has the best performance so far, is widely used as an electrode material. However, in the case of carbon felt, flow loss may occur because the flow of the electrolyte is hindered by the carbon fibers arranged in the thickness direction. Carbon felt is mostly imported from overseas such as China or Japan. In addition, carbon felt has a very high unit price and low surface uniformity, so the amount that can be actually used is about 70% or less. Because of these disadvantages of carbon felt, development of an electrode that can replace it is required.

An object of the present invention is to overcome the above limitations, to replace the carbon felt used as a conventional electrode in a redox flow battery, and to provide a curved carbon electrode for a redox flow battery with improved electrical conductivity, specific reaction surface area, and flow resistance. is to provide

In addition, another object of the present invention is to provide a method for manufacturing a curved carbon electrode for a redox flow battery as described above.

According to embodiments of the present invention for the above object, a structure of a plurality of micro-channel carbon material-based electrodes for a redox flow battery and a manufacturing method thereof are provided.

In one aspect of the present invention, an electrode for a redox flow battery includes a plurality of carbon-based papers stacked in multiple layers, and a plurality of microchannels are formed over a plurality of layers in the inside of the plurality of stacked carbon-based papers. am. The plurality of microchannels reduce the flow resistance of the electrolyte applied to the electrode and improve the specific surface area of the reaction with the electrolyte.

In an exemplary embodiment, the carbon-based paper may be at least one of carbon paper made of carbon fibers and bucky paper made of carbon nanotubes.

In an exemplary embodiment, the plurality of carbon-based paper has a structure in which a plurality of linear grooves are formed side by side on one surface, and a plurality of linear groove-processed carbon-based paper in which the plurality of linear grooves are processed to configure the plurality of microchannels may contain chapters.

In an exemplary embodiment, the plurality of microchannels may be formed by linear grooves formed by laser beam processing on the carbon-based paper.

In an exemplary embodiment, the plurality of carbon-based papers may further include a plurality of flat carbon-based papers stacked between the linear grooved carbon-based papers.

In an exemplary embodiment, the plurality of carbon-based papers may include a plurality of bent-processed carbon-based papers that are formed to be curved in the shape of gear teeth while passing through a pair of micro-gears that rotate in engagement with each other.

In an exemplary embodiment, the plurality of carbon-based papers may further include a plurality of flat carbon-based papers stacked between the curved carbon-based papers.

In an exemplary embodiment, the plurality of carbon-based papers may be firmly bonded to each other using a polymer adhesive containing conductive particles.

In an exemplary embodiment, points where the plurality of carbon-based papers are bent and come into contact with each other may be coupled to each other by carbon fiber stitching.

In another aspect of the present invention, a method for manufacturing an electrode for a redox flow battery according to exemplary embodiments, by inserting and passing carbon-based paper through a pair of micro-gears meshing with each other and rotating, in the shape of the gear teeth of the micro-gears. molding the curved carbon-based paper; and forming a carbon-based paper electrode by stacking a plurality of curved carbon-based papers in multiple layers, wherein a plurality of microchannels are formed over the plurality of layers inside the carbon-based paper electrode.

In an exemplary embodiment, the electrode manufacturing method further includes disposing a plurality of flat carbon-based papers between the plurality of curved carbon-based papers when stacking to form the carbon-based paper electrode. can do.

In an exemplary embodiment, the method of manufacturing the electrode may further include bonding the plurality of carbon-based papers to each other using a polymer adhesive containing conductive particles.

In an exemplary embodiment, the method of manufacturing the electrode may further include stitching points where the plurality of carbon-based papers are bent and come into contact with each other with carbon fibers so that they are bonded to each other.

In an exemplary embodiment, the carbon-based paper may be at least one of carbon paper made of carbon fibers and bucky paper made of carbon nanotubes.

In another aspect of the present invention, a method for manufacturing an electrode for a redox flow battery includes applying a laser beam generated from a laser beam device to the surface of a carbon substrate paper to process a plurality of linear grooves arranged side by side in a first direction; and forming a carbon-based paper electrode by vertically stacking the plurality of carbon-based papers having the plurality of linear grooves, wherein a plurality of microchannels are formed by the plurality of linear grooves inside the carbon-based paper electrode. It is formed over a number of layers.

In an exemplary embodiment, the electrode manufacturing method may further include performing an oxygen plasma surface treatment on the carbon-based paper on which the plurality of linear grooves are processed in a plasma chamber before the lamination.

In an exemplary embodiment, the electrode manufacturing method includes disposing a plurality of flat carbon-based papers between the plurality of linear groove-processed carbon-based papers when stacking for forming the carbon-based paper electrode can include more.

In an exemplary embodiment, the method of manufacturing the electrode may further include bonding the plurality of carbon-based papers to each other using a polymer adhesive containing conductive particles.

In an exemplary embodiment, the method of manufacturing the electrode may further include stitching points where the plurality of carbon-based papers are bent and come into contact with each other with carbon fibers so that they are bonded to each other.

In an exemplary embodiment, the carbon-based paper may be at least one of carbon paper made of carbon fibers and bucky paper made of carbon nanotubes.

According to the utilization of the carbon material-based paper electrode structure having a microchannel structure according to the present invention, it is possible to manufacture an electrode structure in which the flow resistance of the electrolyte is reduced. It is possible to activate material transfer on the surface of the electrode and minimize the loss generated in the pump. According to tests, when microchannels are formed on carbon material-based paper electrodes, the transmittance of electrolyte can be increased more than twice as compared to electrodes without microchannels, and the distribution of electrolytes inside the electrodes is improved, resulting in increased energy efficiency. It can be.

In addition, by forming an electrode structure using carbon material-based paper, which is easy to process channels in a roll-to-roll method, mass production is possible and a system with an increased reaction area compared to a redox flow battery having a conventional channel structure can be configured. It has the advantage of being able to drive even at high current densities.

1 schematically shows a conventional redox flow battery system.
2 is an exploded view showing the overall configuration of a battery cell of a redox flow battery to which the present invention is applied.
3 is a schematic diagram of a separator and a carbon felt electrode in which a channel is formed.
4 is a schematic diagram of a carbon felt electrode in which a channel is formed.
5 illustrates a method of forming a channel of a carbon-based paper electrode using micro gears according to an embodiment of the present invention.
6 illustrates channel shapes of various types of carbon-based paper electrodes formed according to embodiments of the present invention.
7 illustrates a method of forming a channel of a carbon-based paper electrode using a laser beam according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail. The same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

For the embodiments of the present invention disclosed in the text, specific structural or functional descriptions are illustrated only for the purpose of describing the embodiments of the present invention. Embodiments of the present invention may be embodied in various forms, and should not be construed as being limited to the embodiments described herein. That is, since the present invention can have various changes and various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form disclosed, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

2 is an exploded view showing the overall configuration of a redox flow battery system to which the present invention is applied.

Referring to FIG. 2, the redox flow battery system 10 communicates with the battery cell 30 and the internal space of the first electrode part 30a of the battery cell 30 through the first circulation pipe 24a. It communicates with the inner space of the second electrode part 30b of the battery cell 30 through the first tank 20a storing the positive electrolyte 20a and the second circulation pipe 24b, and supplies the negative electrolyte 20b. It may include a first pump 26a and a second pump 26b disposed in the ducts of the second tank 20b, the first circulation pipe 24a and the second circulation pipe 24b, respectively. The first pump 26a pumps the positive electrolyte 20a to circulate between the first tank 20a and the first electrode part 30a, and the second pump 26b pumps the negative electrolyte 20b to It may be allowed to circulate between the second tank 20b and the second electrode part 30b.

The first electrode part 30a includes an outer plate 37a, a collector 32a, a bipolar plate 38a, a gasket 39a, and a flow frame 33a. , an electrode (Electrode) 35a and a membrane (Membrane) 34 may be included. The second electrode unit 30b may also have the same configuration while sharing the membrane 34 with the first electrode unit 30a. That is, the first electrode part 30a and the second electrode part 30b having the same configuration are respectively disposed on the left and right sides of the membrane 34 with the membrane 34 interposed therebetween, and the whole constitutes the electrode cell 30 .

In the redox flow battery system 10 as shown in FIG. 2, the electrolytes 22a and 22b that have moved into the electrode cell 30 are the electrodes 35a and 35b of the first and second electrode parts 30a and 30b. Oxidation and reduction reactions can occur on the surface of In order to continuously induce such a reaction, new electrolytes 22a and 22b from the first and second tanks 20a and 20b must be continuously supplied into the first and second electrode parts 30a and 30b. At this time, when the specific surface area of the electrodes 35a and 35b that can react with the electrolytes 22a and 22b is increased, the porosity of the electrodes 35a and 35b is reduced, which is the electrolyte 22a and 35b. 22b) increases the flow resistance. On the other hand, when the porosity of the electrodes 35a and 35b is increased in order to reduce the flow resistance of the electrolytes 22a and 22b, the specific surface area of the electrodes 35a and 35b that can react with the electrolytes 22a and 22b is reduced. Accordingly, the power density and energy efficiency of the redox flow battery system 10 are reduced.

In particular, the redox flow battery system 10 uses pumps 26a and 26b to circulate the electrolytes 22a and 22b unlike other electrochemical batteries. In the case of a normal battery, performance is judged by energy efficiency.

......(1)

......(One)

However, when there is a pump such as VRFB, system efficiency must be considered in consideration of energy lost in the pumps 26a and 26b.

......(2)

......(2)

The electrodes 35a and 35b of the redox flow battery system 10 are porous media and have very low permeability and high pump loss due to the relatively high viscosity of the electrolytes 22a and 22b. Therefore, it is necessary to improve the system efficiency by reducing the pump loss by improving the permeability of the electrode.

In order to solve these problems, as shown in FIG. 3, while using carbon felt as an electrode, a channel for the flow of electrolyte may be processed in a bipolar plate assembled with the carbon felt to lower the flow resistance. . When a channel is processed in the separator, an oxidation/reduction reaction occurs on the surface of the carbon felt electrode in contact with the electrolyte flowing along the channel. However, the reaction and material exchange occur smoothly only in the cross-sectional area in contact with the electrolyte. Depending on the characteristics of the fluid flowing in the low resistance area, the reactivity and flow of the electrolyte are significantly reduced in areas other than the cross section in contact with the channel. In addition, since the flow of electrolyte is far from the membrane where ion exchange occurs, the rate of ion exchange is rapidly reduced.

If a single flow channel is formed on the surface of the carbon felt electrode as shown in FIG. 4, it is possible to solve the problem of rapid decrease in ion exchange rate that may occur by forming the channel on the separator while reducing the flow resistance. As a method for forming a channel on the surface of a carbon felt electrode, a channel in units of several millimeters can be processed through mechanical methods such as laser and CNC. However, the specific surface area that can be reacted by the carbon fibers removed for channel formation is reduced, and the flow resistance in the area where the channel is formed is low, but the flow resistance in the area where it is not formed is relatively high, so in each area A difference in flow of the electrolyte occurs.

In order to be used as an electrode material for vanadium redox flow batteries, it must have high conductivity, porosity, acid resistance, and low density. A carbon material is a material that can satisfy the above conditions. Carbon felt and carbon paper are typically used as electrode materials for vanadium redox flow batteries. Carbon paper has more uniform physical properties than carbon felt during manufacture and has high electrical conductivity. In addition, since it can be manufactured thin, the power density per unit volume of the vanadium redox flow battery system can be greatly improved by reducing the size of the electrode. It has the advantage of being able to process more uniformly and quickly in processes such as heat treatment or surface treatment, which are post-manufacturing processes. In addition, since the carbon paper is in the form of a thinner sheet than the carbon felt, it is easier to form a channel, and the manufacturing process is simple.

In an exemplary embodiment of the present invention, carbon material-based paper such as carbon paper made of carbon fiber or bucky paper made of carbon nanotubes may be used as an electrode material. Compared to carbon felt, carbon paper has a low porosity and a small reaction area, so energy efficiency, power density, and energy charge are low. In order to minimize this disadvantage, it can be overcome by increasing the reaction area or porosity. In order to increase the porosity, a plurality of micro-channels may be formed in an electrode made of carbon-based paper. When microchannels are formed in the carbon-based paper electrode, the reaction specific surface area can be improved and the flow resistance can be reduced. Accordingly, it is possible to reduce pump loss by improving the permeability of the material as well as improving the distribution of the electrolyte inside the electrode.

Carbon-based paper having such characteristics can be used as an electrode material to form microchannels in the carbon-based paper. The microchannel-forming carbon-based paper electrode according to the exemplary embodiment has the following advantages. First, an electrode having channels at regular intervals has a lower and constant flow resistance of the electrolyte than a conventional electrode structure, so that the electrolyte can pass through the electrode uniformly and with little loss. Second, the internal surface area of the electrode is increased due to the micro-sized channel, so that the contact area between the electrolyte and the electrode is increased compared to the conventional electrode structure. This can improve the voltage efficiency and energy efficiency of the redox flow battery by increasing the cross-sectional area of the electrode in contact with the electrolyte capable of redox reaction and material exchange.

Carbon-based paper electrodes with such microchannels can be made as follows. 5 is a schematic diagram showing a method of forming a channel of a carbon-based paper electrode using a micro gear 50 according to an exemplary embodiment of the present invention.

Referring to FIG. 5 , microchannels may be formed in a carbon-based paper electrode by using a gear device including first and second micro gears configured to rotate in engagement with each other. The first gear device 60 for molding shown in FIG. 5(A) may include first and second micro gears 62 and 64, both of which are spur gears. The second gear unit 70 for molding shown in (B) of FIG. 5 may be composed of a combination of first and micro gears 72 that are spur gears and second micro gears 74 that are spur gears.

Using the first or second micro gear unit 60 or 70 as described above, the carbon paper 50 may be molded through a roll-to-roll process. That is, the carbon-based paper 50 cut for electrode production may be passed between the first micro gear 62 or 72 and the second micro gear 64 or 74 . In such a passing process, the carbon-based paper 50 can be molded into a curved shape as a whole in the shape of the teeth of the gears. As such, in the porous channel structure for the electrode of the redox flow battery, the shape of the bend for the channel can form a channel such as a curved shape, a rectangular shape, an isosceles trapezoidal shape, and the like. This will vary depending on the shape of the micro gear. If the shape of the gear teeth is, for example, an angular trapezoidal shape, as illustrated in (C) of FIG. A channel of the form will be formed. As illustrated in (D) of FIG. 5 , a carbon-based paper electrode 80 having microchannels may be formed by stacking several sheets of carbon-based paper 55 molded in this way.

6 illustrates electrodes with various types of channels.

Referring to FIG. 6 , (A) illustrates a carbon-based paper electrode 100 in which a plurality of microchannels 120 are formed by vertically stacking a plurality of carbon-based papers 110 bent in a sinusoidal shape. (B) is a plurality of microchannels 130a and 130b formed by alternately stacking a plurality of carbon-based papers 110 bent in a sinusoidal shape and a plurality of unprocessed flat carbon-based papers 115 one by one. Carbon-based The paper electrode 140 is exemplified. The microchannel 130a or 130b of the carbon-based paper electrode 140 shown in (B) has a form in which the microchannel 120 of the carbon-based paper electrode 100 shown in (A) is divided in half. (C) illustrates a carbon-based paper electrode 200 in which a plurality of microchannels 220 are formed by stacking a plurality of carbon-based papers 210 processed into an angular square shape vertically as in (A). (D) is a plurality of microchannels (230a, 230b) by alternately stacking a plurality of carbon-based papers 210 processed into an angled square shape and a plurality of non-processed flat carbon-based papers 115 one by one as in (B) The formed carbon-based paper electrode 240 is illustrated. As in the case of (B) and (D), the reaction area between the electrolyte and the electrode can be enlarged by further stacking the unprocessed carbon-based paper between the processed carbon-based paper.

As such, carbon-based paper electrodes having microchannels of various shapes and arrangements may be configured according to the processed shape of the carbon-based paper, the stacking method, and the like. In addition, the advantage of the manufacturing method is that mass production is possible by forming an electrode structure using carbon material-based paper, which is easy to process, and the carbon material-based paper is not constrained in the longitudinal direction, so damage is prevented during manufacturing. can do.

In an exemplary embodiment, as another method of forming a carbon-based paper electrode having microchannels, a laser beam processing method may be used. 7 shows a method of processing microchannels in carbon long paper using a laser according to another embodiment of the present invention.

Referring to FIG. 7 , the carbon-based paper 320 before processing is substantially planar with a substantially flat surface. The laser beam processing machine 300 may emit a laser beam 310 to one surface of the carbon-based paper 320 while being positioned vertically above the carbon-based paper 320 . At this time, the laser beam processing machine 300 performs a relative movement in the y-axis direction from one corner of the carbon-based paper 320 to the opposite corner, then moves a predetermined distance in the x-axis direction, and then moves the relative motion in the y-axis direction in the same way. Do the exercise repeatedly. During this relative movement process, a plurality of linear grooves 325 may be formed side by side in the y-axis direction on the surface of the carbon-based paper 320 .

Such linear grooves 325 may function as micro channels. In laser processing, the material is melted or burned due to the high energy of the laser beam 310, and at this time, as the material is oxidized, a functional group that acts as a catalyst for VRFB is generated. The best thing about laser processing is that surface treatment is performed simultaneously with laser processing. In addition, laser processing can be made while precisely controlling the depth or shape of the channel, that is, the groove 325, by adjusting the energy density of the laser beam 310. And it can be manufactured with a simple manufacturing process and at a reasonable price, and even for complex shapes, it is possible with only 2D drawings.

This laser beam processing method can increase the O/C ratio. Excessive laser processing can reduce Coulombic efficiency. As the channel size decreases, the reaction area due to electrolyte distribution may increase. These microchannels formed on the surface of the carbon-based paper 320 can reduce the pressure loss 2 to 3 times more than when there is no channel. Thus, channels can increase system efficiency as well as energy efficiency.

Prior to the lamination process for forming the carbon-based paper electrode 350 having microchannels, oxygen plasma surface treatment may be performed on the carbon-based paper 320 having the linear grooves 325 formed thereon. This oxygen plasma surface treatment is to reduce the effect of surface treatment by laser processing.

In an exemplary embodiment, a plurality of carbon-based papers 320 having linear grooves 325 may be placed in the plasma chamber 340 and a vacuum pressure of, for example, 3.5 Pa or less may be formed. And, in order to form an oxygen atmosphere, oxygen was continuously introduced into the plasma chamber 340 at a flow rate of 50 sccm, and plasma was maintained for a predetermined time (eg, 5 minutes) with a power of 100 W at a frequency of 100 kHz using the PE mode. can be processed

Carbon-based paper electrodes 350 having microchannels may be completed by vertically stacking the carbon-based papers 320 subjected to oxygen plasma surface treatment. 355 of (D) of FIG. 7 is a photograph of a portion of the cross section of the carbon-based paper electrode 350 having the stacked microchannels. It can be confirmed that the channel 325 processed to a desired depth is visible in the carbon-based paper 320 of each layer by adjusting the energy density of the laser beam 310 .

Meanwhile, in an exemplary embodiment, in manufacturing a carbon material-based electrode having a microchannel, a plurality of vertically stacked carbon material-based papers may be firmly fixed to each other by bonding them with a polymer adhesive including conductive particles. If the contact between the stacked plurality of carbon-based papers is not perfect, contact resistance may increase. Adhering carbon-based papers with a polymer adhesive containing conductive particles is to prevent an increase in contact resistance occurring between the carbon-based papers and to improve structural integrity.

In an exemplary embodiment, carbon black, carbon nanotubes, graphene, and the like may be used as the conductive particles. As the polymer adhesive, polyimide, glucose, epoxy, and the like may be used.

Alternatively, the electrode may be manufactured by fixing points where curved portions of a plurality of carbon-based papers come into contact with each other through stitching of carbon fibers. By doing so, a plurality of carbon-based papers can be bonded more firmly and contact resistance can be reduced.

As described above, the carbon material-based paper electrode having the microchannel formed therein can improve the permeability of the electrolyte. According to the experiment, it can be confirmed that the carbon material-based paper electrode with microchannels has more than twice the transmittance compared to the electrode without it, and the distribution of the electrolyte inside the electrode is improved, resulting in an increase in energy efficiency. As the size of the width versus height of the channel decreased, the transmittance improved, and the system efficiency was also measured to be high. At a current density of 50 mA/cm ² , the system efficiency was improved by 15% when the channel was formed compared to the electrode without a channel.

The present invention can be used in the manufacture of vanadium redox flow batteries.

As described above, although the embodiments have been described with limited drawings, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention described in the claims below. You will understand that you can. For example, the described techniques may be performed in an order different from the method described, and/or components of the described system, structure, device, circuit, etc. may be combined or combined in a different form than the method described, or other components may be used. Or even if it is replaced or substituted by equivalents, appropriate results can be achieved. Therefore, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

50, 320: carbon-based paper
55, 110, 210: molded carbon-based paper
115: unprocessed planar carbon-based paper
120, 130a, 130b, 220, 230a, 230b, 325: microchannel
80, 100, 140, 200, 240: carbon-based paper electrodes with microchannels formed thereon

Claims (20)

As an electrode for a redox flow battery,
The electrode includes a plurality of carbon-based papers stacked in multiple layers,
A structure in which a plurality of microchannels are formed over a plurality of layers inside the plurality of stacked carbon-based papers to reduce the flow resistance of the electrolyte applied to the electrode and improve the specific surface area of reaction with the electrolyte,
The plurality of carbon-based papers,
papers with linear grooves or bent; and
An electrode for a redox flow battery, characterized in that it comprises flat carbon-based papers laminated between the linear grooves or curved papers. The electrode for a redox flow battery according to claim 1, wherein the carbon-based paper is at least one of carbon paper made of carbon fibers and bucky paper made of carbon nanotubes. delete The electrode for a redox flow battery according to claim 1, wherein the linear groove is formed by laser processing. delete The electrode for a redox flow battery according to claim 1, wherein the curved carbon-based papers are formed to be curved in the shape of gear teeth while passing through a pair of micro-gears that rotate in engagement with each other. delete As an electrode for a redox flow battery,
The electrode includes a plurality of carbon-based papers stacked in multiple layers,
A structure in which a plurality of microchannels are formed over a plurality of layers inside the plurality of stacked carbon-based papers to reduce the flow resistance of the electrolyte applied to the electrode and improve the specific surface area of reaction with the electrolyte,
An electrode for a redox flow battery, characterized in that the plurality of carbon-based papers are firmly bonded to each other using a polymer adhesive containing conductive particles. The electrode for a redox flow battery according to claim 1, wherein points where the plurality of carbon-based papers are bent and come into contact with each other are bonded to each other by stitching of carbon fibers. Molding and processing the carbon-based paper bent in the shape of the gear teeth of the micro-gears by inserting and passing the carbon-based paper through a pair of micro-gears that rotate in meshing with each other; and
Forming a carbon-based paper electrode by laminating a plurality of bent-processed carbon-based papers in multiple layers,
When stacking for forming the carbon-based paper electrode, a plurality of flat carbon-based papers are disposed between the plurality of curved carbon-based papers,
An electrode manufacturing method for a redox flow battery, characterized in that a plurality of microchannels are formed over a plurality of layers inside the carbon-based paper electrode. delete Molding and processing the carbon-based paper bent in the shape of the gear teeth of the micro-gears by passing the carbon-based paper through a pair of micro-gears that rotate in meshing with each other; and
Forming a carbon-based paper electrode by laminating a plurality of bent-processed carbon-based papers in multilayers,
Inside the carbon-based paper electrode, a plurality of microchannels are formed over a plurality of layers,
Method for manufacturing an electrode for a redox flow battery, further comprising bonding the plurality of carbon-based papers to each other using a polymer adhesive containing conductive particles. [Claim 11] The method of claim 10, further comprising the step of stitching the bent points of the plurality of carbon-based papers with carbon fibers so that they are bonded to each other. 11. The method of claim 10, wherein the carbon-based paper is at least one of carbon paper made of carbon fibers and bucky paper made of carbon nanotubes. processing a plurality of linear grooves arranged side by side in a first direction by applying a laser beam generated from a laser beam device to the surface of the carbon substrate paper; and
Forming a carbon-based paper electrode by vertically stacking a plurality of carbon-based papers having the plurality of linear grooves processed thereon,
When stacking for forming the carbon-based paper electrode, a plurality of flat carbon-based papers are disposed between the carbon-based papers on which the plurality of linear grooves are processed,
An electrode manufacturing method for a redox flow battery, characterized in that a plurality of microchannels are formed over a plurality of layers by the plurality of linear grooves inside the carbon-based paper electrode. 16. The method of claim 15, further comprising subjecting the carbon-based paper having the plurality of linear grooves to surface treatment in a plasma chamber before the lamination. delete processing a plurality of linear grooves arranged side by side in a first direction by applying a laser beam generated from a laser beam device to the surface of the carbon substrate paper; and
Forming a carbon-based paper electrode by vertically stacking a plurality of carbon-based papers having the plurality of linear grooves processed thereon,
Inside the carbon-based paper electrode, a plurality of microchannels are formed over a plurality of layers by the plurality of linear grooves,
Method for manufacturing an electrode for a redox flow battery, further comprising bonding the plurality of carbon-based papers to each other using a polymer adhesive containing conductive particles. [Claim 16] The method of manufacturing an electrode for a redox flow battery according to claim 15, further comprising the step of stitching the bent points of the plurality of carbon-based papers with carbon fibers so that they are bonded to each other. 16. The method of claim 15, wherein the carbon-based paper is at least one of carbon paper made of carbon fibers and bucky paper made of carbon nanotubes.

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