KR101621033B1 - Capacitive flow electrode device with ion-exchanged current collector - Google Patents

Abstract

[0001] The present invention relates to a capacitive flow electrode device capable of reducing the number of components while greatly reducing the number of parts, thereby greatly reducing the manufacturing cost and installation space, so as to be suitable for large plants such as power generation, energy storage and desalination. Euro; A flow cathode through which the electrode solution mixed with the cathode active material contacts the one side of the electrolyte flow path; A flow negative electrode through which the electrode solution mixed with the negative electrode active material contacts the other side of the electrolyte flow path; A positive electrode ion exchange collector disposed between the electrolyte channel and the flow cathode to allow positive ions to pass therethrough and having electrical conductivity; And a negative electrode ion exchange current collector disposed between the electrolyte flow path and the flowing negative electrode and passing anions therethrough and having electrical conductivity. It is also possible to arrange such adjacent capacitive flow electrode devices to share a flow cathode or a flow cathode so as to increase the capacity as desired by the designer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a capacitive flow electrode device having an ion-

The present invention relates to a capacitive flow electrode device having an ion exchange current collector, and is capable of reducing the number of parts while greatly reducing the manufacturing cost and installation space while enlarging the electrode capacity so as to be suitable for large-scale plants such as power generation, energy storage and desalination To a capacitive flow electrode device.

Recently, countries around the world are working hard to develop clean energy alternative energy and energy storage technology to solve atmospheric pollution and global warming problem.

Due to the continuous rise in fossil fuel prices and the safety issue of nuclear power generation, it is required to break out of the existing production methods that depend only on fossil fuels and nuclear power.

In recent years, alternative energy using hydroelectric power, wind power, and solar energy has been developed, and development using marine concentration difference has become a new topic.

In addition, electric energy storage, ranging from large-capacity power storage devices capable of storing electrical energy generated by various alternative energies to small-sized high-output power storage devices required for various mobile devices or future electric vehicles for improving air pollution, Is emerging as the core of the foundation. Most of these future power storage technologies are based on the principle of ion adsorption (charge) and desorption (discharge) like Li-ion battery or super capacitor. Through the improvement of charge / discharge characteristics of material parts, Many research and development efforts are underway to make it compact and large in capacity.

 In recent years, the same principle has been applied to water treatment such as water purification, water treatment and seawater desalination in preparation for water pollution and water shortage, and water treatment is performed at a very low energy cost compared with the conventional evaporation method or reverse osmosis (RO) Possible processes, namely capacitive deionization (CDI), are under development.

The biggest problem in the power storage and water treatment system using this same principle is the deterioration of efficiency in high capacity and high cost of equipment. In other words, the large size of the electrode for scale-up, the unevenness of the electric field distribution in the electrode, the limited active material amount of the thin film electrode coated on the current collector, the contact area between the active material and the electrolyte due to the binder during the coating process, It is pointed out that a large number of unit cell stacking is required, and accordingly, an increase in operation cost due to a pressure loss of water (electrolytic) flow in a stack in a CDI (Capacitive Deionization) process is pointed out as a problem.

In order to solve the above problems, the applicant of the present invention developed a storage flow electrode device (Korean Patent No. 10-1233295) and developed it (Korean Patent No. 10-1318331), Energy Storage (Korean Patent No. 10-1210525 ), Water treatment (Korean Patent No. 10-1221562).

In order to increase the capacity of the storage type flow electrode device, the electrode area must be increased or stacked. In this case, in the prior art, the cation exchange membrane and the anion exchange membrane are disposed around the electrolyte, And the positive electrode collector and the negative electrode collector are arranged on the outer side. Therefore, in order to stack, these components must be repeatedly laminated in the same manner. Therefore, even if the positive electrode collector and the negative electrode collector are used as a common element, the flow cathode and the flow anode must be arranged around one electrolyte passage.

As a result, the stacking of the flow electrodes not only increases the volume, but also increases the number of parts due to a large number of flow paths, which results in a large cost for manufacturing the device.

Korean Patent No. 10-1233295 Korean Patent No. 10-1318331 Korean Patent No. 10-1210525 Korean Patent No. 10-1221562

SUMMARY OF THE INVENTION An object of the present invention, which is devised to solve the above problems, relates to a capacitive flow electrode device capable of reducing the number of parts by simplifying the structure.

In addition, by sharing the flow cathode and the flow anode in adjacent stacked flow electrode units, it is possible to reduce the number of components and dramatically reduce the manufacturing cost and space while enlarging the electrode capacity to suit large plants such as power generation, energy storage and desalination .

According to an aspect of the present invention, there is provided an electrolytic cell including: an electrolyte channel through which an electrolyte flows; A flow cathode through which the electrode solution mixed with the cathode active material contacts the one side of the electrolyte flow path; A flow negative electrode through which the electrode solution mixed with the negative electrode active material contacts the other side of the electrolyte flow path; A positive electrode ion exchange collector disposed between the electrolyte channel and the flow cathode to allow positive ions to pass therethrough and having electrical conductivity; And a negative electrode ion exchange current collector disposed between the electrolyte flow path and the flowing negative electrode and passing an anion and having electrical conductivity.

When these capacitive flow electrode devices are laminated, the adjacent capacitive flow electrode devices are arranged so as to share a flow cathode or a flow cathode. That is, the storage type flow electrode assembly is arranged alternately so that a plurality of flow anodes, through which a plurality of flow cathodes in which an electrode solution mixed with a cathode active material flows, and an electrode solution in which an anode active material is mixed are spaced apart from each other, Is disposed so as to be in contact with the flow cathode and the flow cathode in a spaced space between the flow cathode and the flow cathode so that a positive electrode ion current collector having positive conductivity and a conductivity is disposed between the electrolyte channel and the flow cathode, And a negative electrode ion exchange current collector disposed between the positive electrode and passing negative ions and having electrical conductivity is disposed between the electrolyte channel and the flowing negative electrode.

Wherein the positive electrode ion exchange collector is formed by laminating a cation exchange membrane and a porous positive electrode plate so as to be in contact with the cation exchange membrane, wherein the negative electrode ion exchange collector has an anion exchange membrane and a porous negative electrode laminated on the anion exchange membrane .

In addition, a spacer is disposed on at least one of the electrolyte flow path, the flow path electrode, and the flow path electrode.

Further, a closing plate is disposed outside the flow cathode and the flow cathode.

The closed plate is provided with an electrode supply part for supplying an electrode solution in which an electrode solution and an anode active material mixed with a cathode active material are supplied to the flow cathode and the flow cathode respectively and a cathode active material mixed with the flow cathode and the cathode active material passing through the flow cathode And an electrode discharge portion through which the electrode solution mixed with the solution and the negative electrode active material is discharged.

The positive electrode exchange positive electrode and the negative electrode ion exchange current collector have a waveform. In this case, the porous skeletal member may be disposed on at least one of the electrolyte flow path, the flow path electrode, and the flow path electrode.

The positive electrode exchange anode, the electrolyte flow path and the negative electrode ion exchange current collector have a waveform. In this case, the porous skeletal member is disposed on at least one of the flow cathode and the flow anode.

The storage flow electrode device according to claim 1, wherein the porous framework member is a porous plate. .

In another embodiment, the ion exchange membrane can be omitted by using the core shell. That is, an electrolyte flow path through which an electrolyte flows; A flow cathode through which the electrode solution mixed with the core shell contacts with one side of the electrolyte channel; A flow negative electrode through which the electrode solution mixed with the core shell contacts the other side of the electrolyte flow path; A positive electrode ion exchange collector disposed between the electrolyte channel and the flow cathode to allow positive ions to pass therethrough and having electrical conductivity; And a negative electrode ion exchange current collector disposed between the electrolyte flow path and the flowing negative electrode and passing an anion and having electrical conductivity.

At this time, the positive electrode ion exchange current collector is a porous positive electrode plate, and the negative electrode ion exchange current collector is a porous negative electrode plate.

It is possible to reduce the number of parts and dramatically reduce the manufacturing cost and installation space by enlarging the electrode capacity so as to be suitable for large-scale plants such as power generation, energy storage and desalination by sharing the flow cathode and the flow anode in the adjacent electrode unit A capacitive flow electrode device can be provided.

1 is a schematic view of a capacitive flow electrode device according to a first embodiment of the present invention.
2 is a schematic view of a capacitive flow electrode assembly according to a second embodiment of the present invention.
3 is a schematic view of a capacitive flow electrode assembly according to a modification of the second embodiment of the present invention.
4 is a schematic view of a capacitive flow electrode device according to a third embodiment of the present invention.
5 is a schematic view of a capacitive flow electrode device according to a fourth embodiment of the present invention.
6 is a cross-sectional view of a core shell having a dual coating.
FIG. 7 is a graph of concentration change with desalting time.
8 is a graph of current change with desalting time.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components, and the same reference numerals will be used to designate the same or similar components. Detailed descriptions of known functions and configurations are omitted.

First, the capacitive flow electrode device 100 according to the first embodiment of the present invention will be described.

 1, a flow cathode 112 and a flow cathode 114 are disposed on both sides of the electrolyte flow path 102. [ A positive electrode ion exchange current collector is disposed between the electrolyte channel 102 and the flow cathode 112 and a negative electrode ion exchange current collector is disposed between the electrolyte channel 102 and the flow anode 114. Closed plates (116, 118) for forming a flow path are disposed outside the flow cathode (112) and outside the flow anode (114).

The flow cathode 112 refers to a flow path in which the positive electrode active material 111 is mixed with the electrode solution and flows in a dispersed slurry state. The flow cathode 114 refers to a flow path through which a negative electrode active material 113 is mixed with an electrode solution and flows in a dispersed slurry state. The flow cathode (112) and the flow anode (114) may be internally provided with a spacer capable of forming a flow path. The cathode active material and the anode active material may be different materials, but the same material may be used. In this case, they are collectively referred to as an electrode active material. The positive electrode active material and the negative electrode active material may be porous carbon (activated carbon, carbon fiber, carbon aerogels, carbon nanotubes, etc.), graphite powder, metal oxide powder and the like.

The electrode solution may be prepared by mixing a solution of a water-soluble electrolyte such as NaCl, H ₂ SO ₄ , HCl, NaOH, KOH and Na ₂ NO _{3 with a} solution of propylene carbonate (PC), diethyl carbonate (DEC) And an organic electrolytic solution such as tetrahydrofuran (THF). Particularly, it is possible to use salt water containing a large amount of salt (particularly, NaCl) or fresh water containing a small amount of salt as the electrode solution.

As the positive electrode ion exchange current collector, as shown in FIG. 1, a stack of a cation exchange membrane 104 and a porous positive electrode plate 106 may be used. The cation exchange membrane 104 is disposed on the electrolyte channel 102 side and the porous cathode plate 106 is disposed on the flow cathode 112 side. Conversely, the cation exchange membrane 104 may be disposed on the flow cathode 112 side, and the porous cathode plate 106 may be disposed on the electrolyte channel 102 side.

As shown in FIG. 1, the negative electrode ion exchange current collector may be formed by superposing the anion exchange membrane 108 and the porous negative electrode plate 110. The anion exchange membrane 108 is disposed on the electrolyte channel 102 side and the porous negative electrode plate 110 is disposed on the flow anode 114 side. Conversely, the anion exchange membrane 108 may be disposed on the flow cathode 114 side, and the porous anode plate 110 may be disposed on the electrolyte channel 102 side.

The thickness of the negative electrode ion-exchange current collector and the positive electrode ion-exchange current collector can be further reduced as compared with the stacked negative-electrode ion-exchange current collector or the positive electrode ion-exchange current collector, if an electrically conductive material capable of transmitting only ions is developed.

As the porous cathode plate 106 and the porous cathode plate 106, a material through which fluid can pass while passing electricity, for example, a carbon fiber plate, can be used. The cation separator 104 is a dense membrane that prevents the electrolyte liquid from flowing and selectively passes only positive ions. The anion separator 108 is a dense membrane that prevents the electrolyte liquid from flowing and selectively passes only negative ions. The cation separator 104 and the anion separator 108 may be made of known ion separators.

The electrolyte solution moves to the electrolyte flow path 102. The electrolyte solution may include NaCl, H ₂ SO ₄ , HCl, NaOH, KOH, Na ₂ NO ₃ And organic electrolyte solutions such as propylene carbonate (PC), diethyl carbonate (DEC), and tetrahydrofuran (THF). Particularly, it is possible to use salt water containing a large amount of salt (particularly, NaCl) or fresh water containing a small amount of salt as the electrode solution. The electrolyte flow path 102 may be formed with a spacer that can form a flow path.

The electrolyte moving direction of the electrolyte channel 102 and the flow direction of the flow cathode 112 and the flow cathode 114 may be the same or opposite to each other.

Also, the electrolyte flow path 102 may be formed as a space through which the electrolyte flows, but a spacer may be filled in the electrolyte flow path 102. The spacer is a periodic insulator and is preferably made of a fiber structure to facilitate the movement of the electrolyte.

The closing plates 116 and 118 may use a non-electrically conductive plate, or an electrically conductive metal plate may be used. If an electrically conductive metal sheet is used, it can be used as an additional collector.

The capacitive flow electrode device 100 according to the first embodiment of the present invention is basically configured as described above. Hereinafter, the operation principle when the capacitive flow electrode device 100 is used as a power generation device will be described. When an electrolyte having a positive ion and an anion is passed through the electrolyte channel 102, positive ions passing through the positive electrode ion exchange current collector migrate to the flow cathode 112, and anions passing through the negative ion exchange current collector flow toward the flow anode (114), a potential difference is generated between the flow cathode (112) and the flow anode (114). When the potential difference is electrically connected to the outside through the porous cathode plate 106 and the porous anode plate 110, the storage flow electrode device 100 can be utilized as a power generation unit.

Conversely, when an electric current is externally applied to generate a potential difference between the porous cathode plate 106 and the porous cathode plate 110, the flow of the electric current through the electrolyte channel 102 to the flow cathode 112 and the flow cathode 114 As the positive and negative ions move from the electrolyte to the electrolyte, the electrolyte is desorbed.

At the same time, since the slurry flowing through the flow cathode 112 and the flow anode 114 is filled with electric charge, the slurry can be stored and utilized as an electric storage device.

Next, a capacitive flow electrode assembly 200 according to a second embodiment of the present invention will be described with reference to FIG. 2, in which capacitive flow electrode device 100 is used as a base to expand the capacitance. The capacitive flow electrode assembly 200 of the second embodiment is an extension of the capacitive flow electrode device 100 of the first embodiment, and the basic structure is the same. However, in the capacitive flow electrode assembly 200 according to the second embodiment, there is a difference in that the flow cathode 214 and the flow cathode 216 are shared in the adjacent flow electrode unit.

In the storage type flow electrode assembly 200, a flow cathode 214 and a flow anode 216 are disposed on both sides of the electrolyte channel 212. A positive electrode ion exchange current collector is disposed between the electrolyte channel 212 and the flow cathode 214. A negative electrode ion exchange current collector is disposed between the electrolyte channel 212 and the flow anode 216. [

The flow cathode 214 and the flow anode 216 may be internally provided with a spacer capable of forming a flow path. The cathode active material 211 included in the flow cathode 214 and the anode active material 213 included in the flow anode 216 may be different materials or the same material may be used.

The positive electrode ion exchange current collector may be formed by superimposing the cation exchange membrane 204 and the porous cathode plate 206. The cation exchange membrane 204 is disposed on the electrolyte channel 212 side and the porous cathode plate 206 is disposed on the flow cathode 214 side.

The negative electrode ion exchange current collector may be formed by superimposing the anion exchange membrane 208 and the porous negative electrode plate 210. The anion exchange membrane 208 is disposed on the electrolyte channel 212 side and the porous anode plate 210 is disposed on the flow anode 216 side.

The flow direction of the electrolyte in the electrolyte channel 212 and the flow direction of the flow cathode 214 and the flow cathode 216 may be the same or opposite to each other.

Further, another electrolyte channel 212 may be disposed above and below the electrolyte channel 212. At this time, they are arranged to share a neighboring flow cathode or flow cathode. That is, the storage type flow electrode assembly 200 is alternately arranged such that a plurality of flow cathodes 214 and a plurality of flow cathodes 216 are spaced apart from each other, and an electrolyte flow channel 212 is formed between the flow cathodes 214 and And is disposed in contact with the flow cathode 214 and the flow anode 216 in a spaced-apart space between the flow anodes 216. A positive electrode ion exchange current collector is disposed between the electrolyte channel 212 and the flow cathode 214 and a negative electrode ion exchange current collector is disposed between the electrolyte channel 212 and the flow anode 216.

As a result, a flow positive electrode or a flow negative electrode is disposed on the uppermost and lowermost sides. Then, the closing plates 222 and 224 are disposed outside the flow cathode or the flow cathode disposed on the uppermost and lowermost sides. The closing plates 222 and 224 may be made of an insulator or a material having electrical conductivity. When a material having electrical conductivity is used as the closing plates 222 and 224, electricity is applied to the flow cathode or the flow cathode in close proximity to the closing plates 222 and 224, 200 can be increased.

The positive electrode ion exchange current collector and the negative electrode ion exchange current collector have a waveform. As a result, it is preferable to increase the area of the positive electrode ion-exchange current collector and the negative-electrode ion-exchange current collector in contact with the electrolytes, the flowpaths, and the flow-anodes with respect to the same widthwise length. The waveform can be variously changed, such as a wedge waveform, a wave waveform, and the like. In this case, since the rigidity of the structure may not be sufficient only by the positive electrode ion-exchange collector negative-electrode ion-exchange current collectors, at least one of the electrolyte passage 212, the flow cathode 214 and the flow anode 216 It is preferable that a porous skeletal member is disposed.

The porous skeletal member may be composed of porous plates 202, 218, and 220. The porous plates 218 and 220 disposed in the flow cathode and the flow cathode can be used both as an electric conductor or as a non-conductor. Particularly, when an electric conductor is used, electricity can be additionally applied to the flow cathode and the flow anode. .

The porous plate 202 provided in the electrolyte channel 212 is preferably made of an insulator so as not to interfere with the movement of positive and negative ions.

FIG. 3 is a capacitor type flow electrode assembly 201 in which the capacitor type flow electrode assembly 200 of FIG. 2 is extended, and it is possible to expand the capacity as desired by a designer.

Next, the flow electrode assembly 300 according to the third embodiment of the present invention will be described with reference to FIG.

The flow electrode assembly 300 is formed by stacking the capacitive flow electrode device 100 and expanding its capacity. The electrolytic flow path 312 is integrated with the positive electrode ion exchange current collector and the negative electrode ion exchange current collector in comparison with the capacitive flow electrode assembly 200 according to the second embodiment, thereby occupying a smaller volume. This is because the electrolyte channel 312 has a space smaller than that of the flow cathode 314 and the flow anode 316 but does not include an active material, and thus the flow rate of the electrolyte can be sufficiently secured.

In the storage flow electrode assembly 300, a positive electrode ion exchange current collector and a negative electrode ion exchange current collector are disposed on both sides of the electrolyte flow path 312.

The positive electrode ion exchange current collector may be formed by superimposing the cation exchange membrane 304 and the porous cathode plate 306. The cation exchange membrane 304 is disposed on the electrolyte channel 312 side and the porous cathode plate 306 is disposed on the flow cathode 314 side.

The negative electrode ion exchange current collector may be formed by superimposing the anion exchange membrane 308 and the porous negative electrode plate 310. The anion exchange membrane 308 is disposed on the electrolyte channel 312 side and the porous negative electrode plate 310 is disposed on the flow anode 316 side.

The flow direction of the electrolyte in the electrolyte channel 312 and the flow direction of the flow channel 314 and the flow channel 316 may be the same or opposite to each other. It is preferable that a spacer is disposed in the electrolyte channel 312 to maintain a space between the positive electrode ion exchange current collector and the negative electrode ion exchange current collector while helping the electrolyte move.

The positive electrode ion exchange current collector, the negative electrode ion exchange current collector, and the electrolyte flow path 312 form a waveform. As a result, the positive electrode ion exchange current collector and the negative electrode ion exchange current collector containing the electrolyte flow path 312 with respect to the same width direction length can increase the contact area with the flow positive electrode and the flow negative electrode. The waveform can be variously changed, such as a wedge waveform, a wave waveform, and the like. In this case, the rigidity of the structure may not be sufficient by only the positive electrode ion-exchange collector negative-electrode ion-exchange current collectors, and therefore, the porous skeleton member may be disposed on the flow cathode 314 and the flow anode 316.

Such a porous framework member may be composed of porous plates 318 and 320. The porous plates 318 and 320 disposed on the flow cathode and the flow cathode can be used for both electrical and non-electrical conductors. In particular, when an electrical conductor is used, electricity can be additionally applied to the flow cathode and the flow cathode. .

The flow cathode 314 and the flow anode 316 may be internally provided with a spacer capable of forming a flow path. The cathode active material 311 included in the flow cathode 314 and the anode active material 313 included in the flow anode 316 may be different materials or the same material may be used.

A plurality of positive electrode ion-exchange collectors and negative-electrode ion-exchange collectors containing the electrolyte passage 312 are disposed, and a flow cathode and a flow anode are alternately arranged on the upper and lower sides thereof to share the flow cathode and the flow anode. . That is, the storage type flow electrode assembly 300 includes a plurality of flow cathodes 314 and a plurality of flow cathodes 316 spaced apart from each other, And the whole and negative electrode ion exchange current collectors are disposed therebetween.

As a result, a flow positive electrode or a flow negative electrode is disposed on the uppermost and lowermost sides. The closing plates 322 and 324 are disposed outside the flow cathode or the flow cathode disposed on the uppermost and lowermost sides. The closing plates 322 and 324 may be made of an insulator or a material having electrical conductivity. When a material having electrical conductivity is used as the closing plates 322 and 324, electric power is applied to the flow cathode or the flow cathode adjacent to the closing plates 322 and 324, 300 can be increased.

Accordingly, the capacitive flow electrode assembly 300 can expand the capacity as much as the designer wants.

Fig. 5 shows a capacitive flow electrode device 101 according to a fourth embodiment of the present invention. The capacitive flow electrode device 101 according to the fourth embodiment is different from the capacitive flow electrode device 100 according to the first embodiment except that the cation exchange membrane 104 and the anion exchange membrane 108 are omitted. Then, the core shells 120 and 121 flow together with the electrode solution in the flow cathode 112 and the flow cathode 114. The rest of the configuration is the same as that of the first embodiment, and a description of the same configuration is omitted.

The core shells 120 and 121 are composed of a core 124 and a coating layer 122 surrounding the core 124. The core 124 is an electrode active material and is capable of exchanging ions present in the electrolyte constituting the coating layer 122. According to one embodiment, the cell material may include a polymer membrane having a sulfonic acid group (SO ₃ ^- ), a carboxyl group (COO ^- ), a phosphoric acid group (PO ₄ ^- ), A polymer membrane having a 2,3,4-diammonium group can be used. The core shells 120 and 121 can be formed by a solid phase method or a liquid phase method. Particularly, the liquid phase method includes an emulsion method using a surfactant, a polymerization method in which a material used as a cell is polymerized in a monomer, Or by extrusion. The core shell 102 has an advantage that one or several individual granules are gathered to surround the cell, and thus the electrode area occupied per unit weight or volume is larger than that of the bulk active electrode active material.

FIG. 6 shows another form of core shell 126. FIG. The core shell 126 includes a core 124 and a coating layer 122 surrounding the core 124. A porous conductive layer 128 is disposed to facilitate the attraction of ions to the outside of the coating layer 122 do. The porous conductive layer 128 may be formed by coating a material such as graphite, graphene, silver, gold, or the like.

[Test Example 1]

In accordance with Example 3 of the present invention, a charged flow electrode device (hereinafter, referred to as " device ") having a rectangular closed plate (polycarbonate Respectively.

The ion exchange anode and the ion exchange anode were each stacked with a cation / anion exchange membrane (Neosepta CMX / AMX. Astom, Japan) in a porous carbon sheet (SIGRATEX® - nonwoven type, SGL group, Germany). In addition, an activated carbon cloth was contacted between the porous carbon sheet and the ion exchange membrane to form an external terminal for connecting the storage flow electrode device with Potentiostat (Ivium Technologies BV, Netherlands).

Activated carbon (average pore diameter 21 Å, total pore volume 1.71 cc / g) having a specific surface area of about 3,263 m 2 / g was milled into a 0.1 M NaCl aqueous solution and finely pulverized with a nanodisperser (ISA-N-10, Ilshin Autoclave, Korea) Thereby producing a flow electrode having an average particle size of 8 mu m of activated carbon. The prepared flow electrode was passed through a positive flow path and a negative flow path of a capacitive flow electrode device at a flow rate of 25 ml / min, and a NaCl electrolyte having an electrical conductivity of 2440 μS / cm was passed through a micro metering pump (manufactured by Nippon Fine Chemical Co., Minichemi pump) at a flow rate of 3 ml / min through the electrolyte flow path of the storage flow electrode device. At the same time, the external terminal of the storage flow electrode device was connected to Potentiostat (Ivium Technologies BV, Netherlands), and a desalination experiment was performed by applying a voltage of 1.2V. The concentration of the NaCl electrolyte after the desalting experiment was measured every 10 seconds by a conductivity meter (S47, Mettler-Toledo, Switzerland). The graph of the concentration change with desalting time is shown in FIG. 7 and the graph of current change is shown in FIG.

The electrical conductivity of the NaCl electrolyte flowing through the electrolytic flow path of the storage type flow electrode device was reduced to 1310 μS / cm and maintained at that value. At this time, the current measured in the storage flow electrode device was maintained at 46.4 mA.

If the supply of the flow electrode continues, it can be seen that the desalination is continuously performed by the infinite adsorption capacity.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It can be understood that

100,101: Capacitive flow electrode device
102, 212, 312:
104, 204, 304: cation exchange membrane
106, 206, 306: porous cathode plate
108, 208, 308: anion exchange membrane
110, 210, 308: Porous negative electrode plate
111, 211, 213: positive electrode active material
112, 214, 314:
113,213,313: Negative electrode active material
114, 216, 316:
116, 118, 222, 224, 322, 324:
120, 121, 126: core shell
122: Coating layer
124: Core
128: Porous conductive layer
200,201,300: Capacitive flow electrode assembly
202, 218, 220, 318, 320:

Claims (20)

An electrolyte flow path through which the electrolyte flows;
A flow cathode through which the electrode solution mixed with the cathode active material contacts the one side of the electrolyte flow path;
A flow negative electrode through which the electrode solution mixed with the negative electrode active material contacts the other side of the electrolyte flow path;
A positive electrode ion exchange collector disposed between the electrolyte channel and the flow cathode to allow positive ions to pass therethrough and having electrical conductivity; And
And a negative electrode ion exchange current collector disposed between the electrolyte flow path and the flowing negative electrode and passing an anion and having electrical conductivity.
The method according to claim 1,
Wherein the positive electrode ion exchange current collector comprises a cation exchange membrane and a porous positive electrode plate laminated so as to be in contact with the cation exchange membrane,
Wherein the negative electrode ion exchange current collector comprises an anion exchange membrane and a porous negative electrode laminated so as to contact the anion exchange membrane.
The method according to claim 1,
Wherein a spacer is disposed on at least one of the electrolyte flow path, the flow path electrode, and the flow path electrode.
The method according to claim 1,
And a closing plate is disposed outside the flow cathode and the flow cathode.
The method according to claim 1,
Wherein the positive electrode ion exchange current collector and the negative electrode ion exchange current collector have a waveform.
6. The method of claim 5,
Wherein at least one of the electrolyte flow path, the flow path electrode, and the flow path electrode has a porous skeleton member.
The method according to claim 1,
Wherein the positive electrode ion exchange current collector, the electrolyte flow path, and the negative electrode ion exchange current collector have a waveform.
8. The method of claim 7,
Wherein a porous skeletal member is disposed on the flow cathode or the flow anode.

9. The method according to claim 6 or 8,
Wherein the porous skeletal member is a porous flat plate. Wherein the flow-through electrode is formed of a conductive material.
A plurality of flow cathodes through which an electrode solution mixed with a plurality of flow cathodes and a plurality of anode active materials through which the electrode solution mixed with the cathode active material flows are alternately arranged,
Wherein a plurality of electrolyte channels through which an electrolyte flows are arranged in contact with the flow cathode and the flow cathode in a spaced space between the flow cathode and the flow cathode,
Wherein a positive electrode ion exchange current collector which passes positive ions and has electrical conductivity is disposed between said electrolyte flow path and said flow positive electrode,
Wherein the negative electrode ion exchange current collector passing negative ions and having electrical conductivity is disposed between the electrolyte flow path and the flow negative electrode.
11. The method of claim 10,
Wherein the positive electrode ion exchange current collector is formed by laminating an anion exchange membrane in contact with the electrolyte flow path and a porous cathode plate in contact with the flow cathode,
Wherein the negative electrode ion exchange current collector is formed by laminating a cation exchange membrane in contact with the electrolyte flow path and a porous negative electrode plate in contact with the flow positive electrode.
11. The method of claim 10,
Wherein a spacer is disposed on at least one of the electrolyte flow path, the flow path electrode, and the flow path electrode.
11. The method of claim 10,
And a closing plate is disposed outside the flow cathode and the flow cathode.
11. The method of claim 10,
Wherein the positive electrode ion exchange current collector and the negative electrode ion exchange current collector have a waveform.
11. The method of claim 10,
Wherein at least one of the electrolyte flow path, the flow path electrode, and the flow path electrode has a porous skeleton member disposed therein.
11. The method of claim 10,
Wherein the positive electrode ion exchange current collector, the electrolyte flow path, and the negative electrode ion exchange current collector have a waveform.
11. The method of claim 10,
Characterized in that a porous skeletal member is disposed on the flow cathode or the flow anode.
18. The method according to claim 15 or 17,
Wherein the porous skeletal member is a porous flat plate. Wherein the flow electrode assembly comprises:
An electrolyte flow path through which the electrolyte flows;
A flow cathode through which the electrode solution mixed with the positive electrode core shell is in contact with one side of the electrolyte channel;
A flow negative electrode through which the electrode solution mixed with the negative electrode core shell comes into contact with the other side of the electrolyte flow path;
A positive electrode ion exchange collector disposed between the electrolyte channel and the flow cathode to allow positive ions to pass therethrough and having electrical conductivity; And
And a negative electrode ion exchange current collector disposed between the electrolyte flow path and the flowing negative electrode and passing an anion and having electrical conductivity.
20. The method of claim 19,
Wherein the positive electrode ion exchange current collector is a porous positive electrode plate and the negative electrode ion exchange current collector is a porous negative electrode plate.

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