KR20190061387A - Redox flow battery - Google Patents

Abstract

A redox flow battery according to an embodiment of the present invention comprises: a stack for generating current; and an electrolyte tank supplying an anode electrolyte and a cathode electrolyte to the stack and having a plurality of diaphragms for dividing the tank into a plurality of spaces. Each of the plurality of diaphragms is inclined at a predetermined angle with respect to a lower surface or an upper surface of the electrolyte tank. The space comprises: a first space for storing the anode electrolyte; a second space for storing the cathode electrolyte; and a third space for storing a two-phase electrolyte discharged from the stack. The electrode life of the redox flow battery can be increased.

Description

Redox Flow Battery {REDOX FLOW BATTERY}

The present invention relates to redox flow cells.

The redox flow cell is an energy storage system that stores the generated power in a grid and supplies it at the required time to increase energy efficiency.

A redox flow cell is a stack comprising a bipolar electrode and a membrane which are repeatedly laminated, a laminate of a current collector plate and an end cap laminated on both sides of the outermost layer, and an electrolyte solution is supplied to the stack And an electrolyte tank for storing an electrolytic solution flowing out after the internal reaction in the stack.

The electrolyte contains an active material, which enables oxidation and reduction of the active material to enable charging and discharging, and is an important factor determining the capacity of the battery.

Among them, the electrolyte of the zinc / bromine flow cell is composed of zinc ions and bromide ions. In the case of bromide ions, bromine is converted to bromine at the time of charging. Since the solubility of bromine is low, it can easily be vaporized and lost. As a result, the amount of the reactant is reduced to deteriorate performance, or there is a safety risk. In order to compensate for this, the bromine complex is formed by introducing a bromine complex to increase the solubility of bromine, thereby preventing loss of bromine and ensuring stability.

However, by forming a bromine complex, the viscosity increases and changes the flowability and affects the internal pressure. Also, in the case of zinc ions, the zinc ions are applied to the electrodes at the time of charging to narrow the gap between the channels, thereby changing the internal pressure, thereby causing a crossover phenomenon.

This causes a problem that the electrolytic solution moves to one electrolyte tank and causes a non-uniform reaction due to the difference in the level of the electrolytic solution, and thus the reaction material can not be supplied to each electrode, shortening the life of the electrode.

Accordingly, it is an object of the present invention to provide a redox flow cell capable of increasing the lifetime of an electrode by uniformly maintaining the internal pressure between the anode electrolyte tank and the cathode electrolyte tank and reducing the water level difference between the anode electrolyte tank and the cathode electrolyte tank will be.

The present invention also provides a redox-flow battery in which an electrolyte is not left on the bottom of the electrolyte tank when the electrolyte is discharged from the electrolyte tank.

According to an aspect of the present invention, there is provided a redox flow cell comprising: a stack for generating current; an electrolyte tank having a plurality of diaphragms for supplying an anode electrolyte and a cathode electrolyte to the stack and dividing the electrolyte into a plurality of spaces; Wherein each of the plurality of diaphragms is inclined at a predetermined angle with respect to a lower surface or an upper surface of the electrolyte tank, the space being divided into a first space for storing the anode electrolyte, a second space for storing the cathode electrolyte, And a third space for storing the discharged two-phase electrolytic solution.

The diaphragm may include a first diaphragm that divides the first space and the second space, a second diaphragm that divides the second space and the third space, and a third diaphragm that divides the second space into a plurality of spaces.

The first diaphragm and the second diaphragm are inclined with respect to the lower surface of the electrolyte tank so that the first diaphragm and one side of the second diaphragm are spaced apart from the upper surface of the electrolyte tank respectively and the third diaphragm is inclined with respect to the upper surface of the electrolyte tank And one side of the third diaphragm may be spaced apart from the lower surface of the electrolyte tank.

The other end of the third diaphragm may be located in a region where the first diaphragm and the second diaphragm face each other.

The first diaphragm and the second diaphragm may have different heights.

Wherein the height of the first diaphragm is at least 40% and less than 60% of the height of the electrolyte tank, the height of the second diaphragm is at least 60% and less than 80% of the height of the electrolyte tank, and the height of the third diaphragm is at least 75% 95% or less.

The first angle formed by the first diaphragm and the second diaphragm with the lower surface of the electrolyte tank and the second angle formed by the third diaphragm and the upper surface of the electrolyte tank may be the same.

The first diaphragm, the second diaphragm, and the third diaphragm may be inclined in a direction in which the electrolyte flows.

The first angle and the second angle may be between 15 degrees and less than 75 degrees.

The third diaphragm may be disposed closer to the first diaphragm than the second diaphragm.

By manufacturing the redox flow cell as in the present invention, it is possible to keep the internal pressure between the anode electrolyte tank and the cathode electrolyte tank uniform while maintaining a uniform water level, thereby preventing the reaction from proceeding unevenly.

Therefore, the electrode life of the redox-flow battery can be increased.

1 is a schematic block diagram of a redox flow cell according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of the stack applied to Figure 1;
3 is a cross-sectional view taken along line III-III in FIG.
4 is a cross-sectional view taken along the line IV-IV in Fig.
5 is a schematic cross-sectional view of the electrolyte tank applied to Fig.
6 and 7 are schematic cross-sectional views of an electrolyte tank according to the prior art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. In the following detailed description, the names of components are categorized into the first, second, and so on in order to distinguish them from each other in the same relationship, and are not necessarily limited to the order in the following description. Throughout the specification, when an element is referred to as " comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

It should be noted that terms such as " ... unit ", " unit of means ", " part of item ", " absence of member ", and the like denote a unit of a comprehensive constitution having at least one function or operation it means.

Hereinafter, a redox flow cell according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of a redox flow cell according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the stack applied to FIG. 1, and FIG. 3 is a cross- And Fig. 4 is a cross-sectional view cut along the line IV-IV in Fig.

1 and 2, a redox flow cell according to an embodiment of the present invention includes a stack 100, an electrolyte (not shown) for supplying an electrolyte to the stack 100, and an electrolyte And a circulation unit connecting the tanks 200, 300, and 400 and the electrolyte tanks 200, 300, and 400 to the stack 100.

The stack 100 may be connected to external charges through the bus bars B1 and B2 to discharge the current generated inside the stack 100. [

For example, the stack 100 can be formed by stacking a plurality of unit cells C1 and C2. For convenience of explanation, in the embodiment of the present invention, the first unit cell C1 and the second unit cell C2 located on both the left and right sides will be described as an example.

3 and 4, the stack 100 includes a membrane 10, a spacer 20, an electrode plate 30, a membrane flow frame 40, an electrode flow frame 50, a first current collector plate 61 A second current collecting plate 62, a first end cap 71, and a second end cap 72. The first end cap 62 and the second end cap 62 are electrically connected to each other.

Since the stack 100 has a plurality of unit cells C1 and C2, the two membrane flow frames 50, which are disposed at the center of the electrode flow frame 50 and are arranged in a symmetrical structure on both sides of the electrode flow frame 50, And a pair of first end caps 71 and second end caps 72, which are disposed on the outer periphery of the membrane flow frame 40, respectively.

The membrane 10 is configured to pass ions and is coupled to the center of the membrane flow frame 40 in the thickness direction, and the electrode plate 30 is coupled to the center in the thickness direction of the electrode flow frame.

The first end cap 71, the membrane flow frame 40, the electrode flow frame 50, the membrane flow frame 40 and the second end cap 72 are disposed and the membrane 10 and the electrode plate 30 The plurality of unit cells C1 to C2 are formed by bonding the membrane flow frame 40, the electrode flow frame 50 and the first and second end caps 71 and 72 to each other with the spacers 20 interposed therebetween. The stack 100 is formed.

The electrode plates 61 and 62 are formed such that the anode electrode 32 is formed on one side and the cathode electrode 31 is formed on the other side in the portion where the plurality of unit cells C1 and C2 are connected to form a plurality of unit cells C1 And C2 are connected in series to form a bipolar electrode. A carbon coating layer may be formed on the cathode electrode 31.

The membrane flow frame 40, the electrode flow frame 50 and the first end cap 71 are adhered to each other to set the internal volume S between the membrane 10 and the electrode plate 30, A first flow channel CH1 and a second flow channel CH2 for supplying an electrolyte solution to the first flow channel CH1 and the second flow channel CH2 are formed. The first flow channel CH1 and the second flow channel CH2 are configured to supply the electrolytic solution to both sides of the membrane 10 at a uniform pressure and amount, respectively.

The first flow channel CH1 connects the anode electrolyte inlet H21, the internal volume S and the anode electrolyte outlet H22 to the membrane 10 by driving the first pump P1 The anode electrolyte is caused to correspond to the internal volume S set between the anode electrodes 32 so as to be allowed to flow out after the reaction.

The second flow channel CH2 connects the cathode electrolyte inlet H31, the internal volume S and the cathode electrolyte outlet H32 to the membrane 10 by driving the second pump P2 (see FIG. 1) And the cathode electrode 31, so that the cathode electrolyte can flow out after the reaction.

The membrane flow frame 40, the electrode flow frame 50, the first end cap 71, and the second end cap 72 are made of an electrically insulating material including a synthetic resin component, .

The flow cell according to the present invention may be a zinc-bromine flow battery. During charging, a reaction as shown in [Equation 1] occurs between the membrane 10 and the cathode electrode 31, (2) may occur between the first electrode 32 and the second electrode.

 [Formula 1]

2Br ^? 2Br + 2e ^-

[Formula 2]

Zn ^{2 +} + 2e ^- Zn

Conversely, during the discharge, a reverse reaction of [Equation 1] occurs between the membrane 10 and the cathode electrode 31, and an adverse reaction of [Equation 2] occurs between the membrane 10 and the anode electrode 32.

The first current collecting plate 61 and the second current collecting plate 62 collect current generated in the cathode electrode 31 and the anode electrode 32 or collect currents in the cathode electrode 31 and the anode electrode 32 from the outside. To the outermost electrode plate 30 and electrically connected thereto.

The first bus bar B1 and the second bus bar B2 are electrically connected to the first current collecting plate 61 and the second current collecting plate 62, Lt; RTI ID = 0.0 > 100 < / RTI >

The first end cap 71 receives a first current collecting plate 61 connected to the first bus bar B1 and an electrode plate 30 connected to the first current collecting plate 61, . The first end cap 71 may be integrally formed with the first collector plate 61 and the electrode plate 30 of the bus bar B1 and may include a bus bar B1, a first current collector plate 61, The electrode plate 30 can be inserted and molded by insert injection.

The second end cap 72 is integrally formed with the second current collecting plate 62 connected to the second bus bar B2 and the electrode plate 30 connected to the second current collecting plate 62, Can be formed. The second end cap 72 may be formed by insert injection by inserting the second bus bar B2, the second current collector plate 62, and the electrode plate 30. FIG.

The first end cap 71 has anode and cathode electrolyte inlets H21 and H31 on one side and is connected to the first and second flow channels CH1 and CH2 so as to introduce the anode electrolyte and the cathode electrolyte respectively. The second end cap 72 has anode and cathode electrolyte outlets H22 and H32 on one side and is connected to the first and second flow channels CH1 and CH2 to discharge the anode electrolyte and the cathode electrolyte.

Referring again to FIG. 1, the stack 100 and the electrolyte tank 200 may be connected to the circulation unit, and the anode electrolyte and the cathode electrolyte may circulate through the circulation unit 100 and the electrolyte tank 200.

The electrolyte tank 200 supplies an anode electrolyte between the membrane 10 and the anode electrode 32 of the stack 100 and supplies a cathode electrolyte between the membrane 10 and the cathode electrode 31 of the stack 100 do. The electrolyte tank 200 accommodates a cathode electrolyte (two-phase electrolyte) flowing out between the membrane 10 and the cathode electrode 31 of the stack 100.

5 is a schematic cross-sectional view of the electrolyte tank applied to Fig.

Referring to FIG. 5, an electrolyte tank according to an embodiment of the present invention includes a plurality of diaphragms Q1, Q2, Q3, and a plurality of diaphragms Q1, Q2, Into the spaces S1, S2, and S3. The space includes a first space S1 for storing the anode electrolyte and supplying the anode electrolyte to the stack, a second space S2 for storing the cathode electrolyte and supplying the cathode electrolyte to the stack, and a cathode electrolyte discharged from the stack And a third space S3 for storing the third space S3.

Accordingly, the first space S1 may be the anode electrolyte tank, the second space S2 may be the cathode electrolyte tank, and the third space S3 may be the two-phase electrolyte tank.

The anode electrolyte may be an electrolytic solution containing zinc, and the cathode electrolytic solution may be electrolytic solution containing bromine. The cathode electrolytic solution discharged from the stack is a two-phase electrolytic solution and can be separated into two phases depending on the specific gravity. Of these, the middle dibromin is located at the bottom of the two-phase electrolyte tank, and the aqueous bromine is located at the top of the two-phase electrolyte tank.

The plurality of diaphragms Q1, Q2 and Q3 may be inclined at an angle to the lower surface J1 or the upper surface J2 of the electrolyte tank 200 so as to have inclined surfaces J3.

The diaphragm has a first diaphragm Q1 dividing the first space S1 and a second space S2, a second diaphragm Q2 dividing the second space S2 and the third space S3, And a third diaphragm Q3 that divides the first diaphragm S2 into a plurality of diaphragms.

One side of the first diaphragm Q1 and the other side of the second diaphragm Q2 are tilted and connected to the bottom surface J1 of the electrolyte tank to form the inclined plane J1 and the first diaphragm Q1 and the second diaphragm Q2, May be spaced from the upper surface J2 of the electrolyte tank, respectively.

The first diaphragm Q1 and the second diaphragm Q2 may have different heights H1 and H2. At this time, the height is measured perpendicularly from the lower surface J1 of the electrolyte tank toward the upper surface J2 of the electrolyte tank.

The height H1 of the first diaphragm Q1 may be 40% or more and less than 60% of the height H of the electrolyte tank and the height H2 of the second diaphragm Q2 may be 60% or more of the height H of the electrolyte tank May be less than 80%.

One side of the third diaphragm Q3 is tilted and connected to the upper surface J2 of the electrolyte tank to form the inclined surface J3 and the other side of the third diaphragm Q3 can be spaced from the bottom surface J1 of the electrolyte tank have. At this time, the other end of the third diaphragm Q3 may be positioned between the areas where the first diaphragm Q1 and the second diaphragm Q2 face each other.

The height H3 of the third diaphragm Q3 is a length measured vertically from the upper surface J2 of the electrolyte tank toward the lower surface J1 and may be 75% or more and 95% or less of the height H of the electrolyte tank.

The first diaphragm Q1 and the second diaphragm Q2 are inclined toward the lower surface J1 of the electrolyte tank and the angle? 1 between the lower diaphragm Q1 and the second diaphragm Q2 may be 15 degrees or less and 75 degrees or less, The diaphragm Q3 is inclined toward the upper surface J2 of the electrolyte tank and the angle (? 2) with the upper surface J2 may be less than 15 degrees and less than 75 degrees. At this time, the first diaphragm (Q1) to the third diaphragm (Q3) may be inclined at the same angle so that the facing surfaces are parallel to each other.

The distance W1 between the lower portion of the first diaphragm Q1 and the side wall of the electrolyte tank may be 40% to 60% or less of the total width W of the electrolyte tank. The distance W2 between the lower portion of the third diaphragm Q3 and the side wall of the electrolyte tank may be 60% to 80% of the total width W of the electrolyte tank. The third diaphragm Q3 is located adjacent to the first diaphragm Q1 so that the distance from the third diaphragm Q3 to the first diaphragm Q1 is greater than the distance from the third diaphragm Q3 to the second diaphragm Q2. The distance can be arranged closer.

1 and 5, the circulation unit may include a plurality of pipes L21, L22, L31, L32, L41 and pumps P1, P2. The first space S1 of the electrolyte tank 200 and the anode inlet H21 of the stack are connected by a first pipe L21 and the first space S1 and the anode outlet H22 of the stack are connected to the second pipe The second space S2 and the cathode inlet H31 of the stack are connected by a third pipe L31 and the cathode outlet H32 and the third space S3 are connected by a fourth pipe L32, (L32). At this time, the first pump L21 and the third pipe L31 may be provided with a first pump P1 and a second pump P2, respectively, and may be supplied to the first and second pumps P1 and P2 The electrolytic solution can be controlled by the control valves VV1 and VV2.

The third pipe L31 connecting the second space S2 and the cathode inlet H31 may further include a branch pipe L41 branched to connect to the two-phase electrolyte tank S3. The branch pipe L1 may be provided with a valve V3.

In addition, control valves VV1, VV2, VV3, and VV4 may be installed in the first pipe to the fourth pipe, respectively. The control valves VV1, VV2, VV3, and VV4 include a pressure sensor and a ratio valve for sensing the pressure in the pipe, and the pressure sensor and the ratio valve can be connected to the control unit 700. [ The control unit 700 receives the measured pressure information from the pressure sensor, and determines the degree of opening of the rate valve according to the pressure to control the rate valve.

That is, the pressures of the first pipe and the third pipe are high, the pressures of the second pipe and the fourth pipe are low, and a pressure difference is generated therebetween, so that the pressure inside the stack may not be uniform. As described above, if a pressure difference occurs between a portion where the electrolyte is injected and a portion where the electrolyte is injected, the electrical characteristics of the battery may be reduced.

Accordingly, if the measured pressure is high, the ratio valve is opened to reduce the pressure, and if the pressure is low, the ratio valve is tightened to increase the pressure so that the pressure difference between the first pipe and the second pipe, Can be adjusted so that the pressure difference of the first and second pressure chambers does not occur. Of course, it is possible to reduce the pressure difference by increasing or decreasing the voltage of the first pump and the second pump and changing the flow rate of the electrolytic solution.

On the other hand, the electrolytic solution in the first space S1, the second space S2 and the third space S3 is easily transferred to the pipes L21, L31 and L41 by the inclination of the diaphragms Q1, Q2 and Q3 Can be discharged.

The diaphragms Q1, Q2 and Q3 can be inclined in the direction in which the electrolytic solution moves. This is because the electrolytic solution stored in the first space S1, the second space S2 and the third space S3, As shown in FIG.

Specifically, the two-phase electrolyte discharged from the stack flows into the third space S3 through the pipe L32 and is stored in the third space S3 without exceeding the second diaphragm Q2 until the water level reaches a certain level. do. At this time, the two-phase electrolyte stored in the third space S3 may be separated into two phases depending on the specific gravity as a bromine complex. Of these, the densely populated dibasic bromine is located at the bottom of the two-phase electrolyte tank and the aqueous bromine is located at the top of the two-phase electrolyte tank.

The third space S3 is narrowed by the inclined second diaphragm Q2, and the width of the third space S3 is increased toward the upper part, so that a substantially triangular section may be formed. As such, if the width is narrower toward the lower side, the middle-born bromine positioned at the lower portion is more easily transferred to the pump P2 connected to the pipe L41 by the inclined surface J3, and can be easily supplied to the stack .

The aqueous bromine located at the upper portion of the third space S3 can be easily transferred to the second space S2 along the inclined surface J3 by the inclined plane J3 formed by the second diaphragm Q2 .

The second space S2 includes a first small space SS1 and a second small space SS2 divided by the third diaphragm Q3. When the second space S2 is divided into the first small space SS1 and the second small space SS1, the electrolyte delivered from the third space S3 is separated in the first small space SS1 according to the density. And the relatively dense electrolyte moves to the second small space SS2 through the spaced space between the third diaphragm Q3 and the bottom surface J1 of the electrolyte tank. The electrolytic solution transferred to the second small space SS2 can be easily moved to the first space S1 along the inclined surface of the first diaphragm Q1 and the water level can be corrected.

Bromine complexes that are relatively low in density and relatively immiscible with prebromine in the electrolyte delivered from the third space S3 may cause self-discharge when introduced into the stack. However, in the present invention, the self-discharge can be prevented by separating the electrolyte tank using a diaphragm and introducing a relatively dense electrolyte into the stack.

Further, the difference in level between the anode electrolyte in the first space S1 and the cathode electrolyte in the second space S2 is easily reduced by the diaphragm, and the electrolyte can be uniformly supplied to the stack.

On the other hand, the first diaphragm Q1, the second diaphragm Q2 and the second diaphragm Q3 are inclined in a direction in which the electrolyte moves, thereby facilitating the movement of the electrolyte while minimizing the flow of the electrolyte in the opposite direction .

Comparison of energy efficiency and charge efficiency

Evaluation was carried out using a zinc / bromine redox flow cell. Here, a 2.25M zinc / bromine aqueous solution was used as the zinc and bromine electrolyte, and the charge completion charge was 2.98Ahr / cell and the discharge completion voltage was 1.0V / cell. The electrode was made of carbon plastic (manufactured by Lotte Chemical Co., Ltd.) to a thickness of 600 mu m, and the membrane was made of Asahi product SF601 with a thickness of 600 mu m.

6 and 7 are schematic cross-sectional views of the electrolyte tank according to the prior art.

Energy efficiency, voltage efficiency, and charge efficiency can be obtained from Equation 3, Equation 4, and Equation 5, respectively.

[Formula 3]

Energy Efficiency (EE) = (discharge energy (Wh) / charge energy (Wh)) * 100

[Formula 4]

Voltage Efficiency (VE) = (energy efficiency / charge efficiency) * 100

[Formula 5]

Current Efficiency (CE) = (Discharging Capacity (Ah) / Charging Capacity (Ah)) * 100

[Comparative Example 1]

In Comparative Example 1, as shown in Fig. 6, the anode electrolyte tank and the cathode electrolyte tank of the battery were separated, and the anode electrolyte and the cathode electrolyte were stored in the respective electrolyte tanks.

[Comparative Example 2]

In Comparative Example 2, as shown in Fig. 7, a diaphragm is formed in the electrolyte tank of the battery, and the diaphragm is formed in a direction perpendicular to the lower surface of the electrolyte tank.

[Example 1]

In Embodiment 1, as shown in Fig. 5, a diaphragm is formed in the electrolyte tank of the battery, and the diaphragm is inclined with respect to the lower surface of the electrolyte tank.

The performance of the batteries of Comparative Examples 1 and 2 and Example 1 is shown in Tables 1, 2 and 3, respectively.

At this time, the battery energy efficiency, the charge efficiency and the voltage efficiency were measured.

Referring to Tables 1 to 3, it was confirmed that the charge amount efficiency was kept constant in Comparative Example 2 and Example 1 as compared with Comparative Example 1. [

After completion of the discharge, in Comparative Examples 1 and 2, the bromine complex remained on the bottom surface of the cathode electrolyte. In Example 1, however, no bromine complex remained on the bottom surface of the cathode electrolyte.

This is because the charge amount of the Bromine complex in the third space in which the two-phase electrolyte is stored can be easily introduced into the stack due to the inclined plane, thereby increasing the discharge charge and thus increasing the charge efficiency.

In the case of Comparative Example 1, it was confirmed that the Br ^{2 +} concentration was 0.05 M or less in Example 1, although it was 0.1 M or more of Br ^{2 +} in the anode electrolyte at the time of completion of charging.

This is because, due to the inclined diaphragm, the complex in the cathode electrolytic solution can not separate and flow into the anode electrolyte tank.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

10: membrane 20: spacer
30: electrode plate 31: cathode electrode
32: anode electrode 40: membrane flow frame
50: electrode flow frame 61, 62: first and second collectors
71, 72: first and second end caps 100: stack
200: electrolyte tank

Claims (9)

A stack generating current,
An anode electrolyte and a cathode electrolytic solution are supplied to the stack, and the electrolyte tank is divided into a plurality of spaces by a plurality of diaphragms,
Lt; / RTI >
The plurality of diaphragms are each inclined at a predetermined angle with respect to a lower surface or an upper surface of the electrolyte tank, and the space includes a first space for storing the anode electrolyte, a second space for storing the cathode electrolyte, And a third space for storing the two-phase electrolyte. The method of claim 1,
The diaphragm may include a first diaphragm that divides the first space and the second space,
A second diaphragm that divides the second space and the third space,
And a third diaphragm dividing the second space into a plurality of
Wherein the redox flow cell comprises: 3. The method of claim 2,
Wherein the first diaphragm and the second diaphragm extend obliquely to a lower surface of the electrolyte tank and one side of the first diaphragm and the second diaphragm are spaced apart from an upper surface of the electrolyte tank,
Wherein the third diaphragm extends obliquely on an upper surface of the electrolyte tank and one side of the third diaphragm is spaced apart from a lower surface of the electrolyte tank. 4. The method of claim 3,
And the other end of the third diaphragm is located in a region where the first diaphragm and the second diaphragm face each other. 4. The method of claim 3,
Wherein the first diaphragm and the second diaphragm have different heights. The method of claim 5,
The height of the first diaphragm is not less than 40% and less than 60% of the height of the electrolyte tank,
The height of the second diaphragm is 60% or more and less than 80% of the height of the electrolyte tank,
Wherein the height of the third diaphragm is 75% or more and 95% or less of the height of the electrolyte tank. 3. The method of claim 2,
Wherein the first angle formed by the first diaphragm and the second diaphragm with the lower surface of the electrolyte tank is the same as the second angle formed by the upper surface of the electrolyte tank and the third diaphragm. 8. The method of claim 7,
Wherein the first angle and the second angle are between about 15 degrees and about 75 degrees. 3. The method of claim 2,
Wherein the third diaphragm is disposed closer to the first diaphragm than the second diaphragm.

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