Metal aqueous battery and hydrogen production and carbon dioxide storage system comprising same

Abstract

The invention relates to a metal aqueous battery and a hydrogen production and carbon dioxide storage system comprising the same. The metal aqueous battery comprises a double battery, the double battery is formed by inserting a pair of single batteries into a current collector in a manner that the cathodes face each other, each single battery comprises an anode, the cathode and a separator positioned between the anode and the cathode, each single battery comprises a cathode gasket positioned between the separator and the cathode, and the cathode gasket is arranged between the separator and the cathode. And a gap is formed between the diaphragm and the cathode.

Description

Technical Field

[0001] The invention relates to a metal-water battery and a hydrogen production and carbon dioxide storage system comprising the same. Background Art

[0002] In recent years, research on electrochemical water electrolysis has been actively conducted as renewable energy is being developed to combat climate change. 2 )Capture, storage and conversion technologies are becoming increasingly important.

[0003] In terms of price and reserves, the zinc / aluminum (Zn / Al) based aqueous battery system is a very economical metal cathode candidate. The zinc / aluminum (Zn / Al) based aqueous battery system is a very economical metal cathode candidate. 3 System for isohaline carbon dioxide capture.

[0004] However, the existing metal aqueous battery is a single battery formed of an anode and a cathode, and a battery pair based thereon, and therefore, the current that can be obtained is limited. Summary of the invention

[0005] An object of the present invention is to provide an aqueous metal battery having improved current generation amount and current generation speed.

[0006] An object of the present invention is to provide an aqueous metal battery capable of preventing anode passivation.

[0007] The object of the present invention is not limited to the above-mentioned object. The object of the present invention will become more clear through the following description and will be achieved through the schemes and combinations thereof described in the claims.

[0008] A metal aqueous battery according to an embodiment of the present invention may include a double cell, wherein the double cell is formed by stacking a pair of single cells by inserting a current collector in a manner that the cathodes face each other, the single cell includes an anode, a cathode, and a separator located between the anode and the cathode, the single cell includes a cathode gasket, the cathode gasket is located between the separator and the cathode, and a gap is formed between the separator and the cathode.

[0009] The cell may include a plate having a plate shape of a predetermined thickness including a first peripheral surface and a second peripheral surface opposite to the first peripheral surface, the plate being located at the periphery of the cell and including an inner space open toward the first peripheral surface.

[0010] The anode may be accommodated in the inner space.

[0011] The diaphragm may be stacked on the first peripheral surface and cover an open surface of the internal space.

[0012] The plate may include: a first electrolyte inflow portion formed at a portion of a side area of ​​the plate and communicating with the inner space; and a first electrolyte outflow portion located a predetermined distance away from the first electrolyte inflow portion and communicating with the inner space.

[0013] The anode may be in a particle shape, and the single cell may further include a support body, which is obliquely arranged in the internal space and includes a plurality of through holes, and the anode is accommodated between the inner surface of the plate and the support body, and the diameter of the through hole is smaller than the diameter of the anode.

[0014] The anode may be in a sheet shape, and the single cell may further include a pressure applying portion received in the internal space and disposed between the inner surface of the plate and the anode, the pressure applying portion applying pressure to move the anode toward the separator side.

[0015] The anode may include at least one selected from the group consisting of lithium (Li), sodium (Na), magnesium (Mg), zinc (Zn), aluminum (Al), and combinations thereof.

[0016] The aqueous metal battery may further include a wire electrically connecting the anode and a current collector.

[0017] The cathode may include a noble metal catalyst mounted on a carrier.

[0018] The metal aqueous battery may also include a diaphragm gasket, which is located between the plate and the diaphragm, has a predetermined thickness, and is in the shape of a frame with a through hole formed in the center. The diaphragm gasket supports the edge portion of the diaphragm so that the internal space of the plate is expanded by a thickness corresponding to the thickness of the diaphragm gasket.

[0019] The aqueous metal battery may further include a protective film, which is a porous protective film having a shape corresponding to the open surface of the plate and disposed on the open surface of the plate.

[0020] The separator may include a substance having cation conductivity or a substance having anion conductivity.

[0021] The cathode gasket may be in the shape of a frame with a through hole formed in the center, supporting the edge portion of the diaphragm to form the gap, and the cathode gasket includes: a second electrolyte inflow portion, formed in a portion of the side surface of the cathode gasket and connected to the gap; and a second electrolyte outflow portion, arranged in a portion of the side surface of the cathode gasket at a position separated by a predetermined distance from the second electrolyte inflow portion and connected to the gap.

[0022] The aqueous metal battery may further include: a first electrolyte accommodated in the inner space of the plate; and a second electrolyte accommodated in the gap.

[0023] The first electrolyte may include an alkali metal hydride.

[0024] The second electrolyte may include hydrogen ions and bicarbonate ions.

[0025] The temperature of the first electrolyte may be 40°C to 80°C.

[0026] The temperature of the second electrolyte may be 40°C to 80°C.

[0027] The temperature of the first electrolyte may be the same as the temperature of the second electrolyte, or the temperature of the first electrolyte may be higher than the temperature of the second electrolyte.

[0028] The metal aqueous battery may include a battery stack formed by stacking a plurality of bi-batteries.

[0029] A hydrogen production and carbon dioxide storage system according to an embodiment of the present invention may include: the metal aqueous battery; a first electrolyte supply unit, which supplies a first electrolyte to the metal aqueous battery; a second electrolyte supply unit, which supplies a second electrolyte to the metal aqueous battery; a first heating unit, which is located between the metal aqueous battery and the first electrolyte supply unit; and a second heating unit, which is located between the metal aqueous battery and the second electrolyte supply unit.

[0030] The first heating unit may include a first heat exchanger that heat exchanges heat between the first electrolyte and a heat source, and the second heating unit may include a second heat exchanger that heat exchanges heat between the second electrolyte and a heat source.

[0031] According to the present invention, it is possible to obtain an aqueous metal battery having an improved current generation amount and current generation speed.

[0032] According to the present invention, an aqueous metal battery capable of preventing anode passivation can be obtained.

[0033] The effects of the present invention are not limited to the above-mentioned effects. It should be understood that the effects of the present invention include all effects that can be inferred from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A first embodiment of the aqueous metal battery of the present invention is shown.

[0035] Figure 2 This is used to explain the flow of electrolyte in the aqueous metal battery of the present invention.

[0036] Figure 3 A board according to the invention is shown.

[0037] Figure 4A A first embodiment of the support body of the present invention is shown.

[0038] Figure 4B A second embodiment of the support body of the present invention is shown.

[0039] Figure 4C A third embodiment of the support body of the present invention is shown.

[0040] Figure 5 A second embodiment of the aqueous metal battery of the present invention is shown.

[0041] Figure 6 The cathode gasket of the present invention is shown.

[0042] Figure 7 A battery stack according to the present invention is shown.

[0043] Figure 8 The hydrogen production and carbon dioxide storage system of the present invention is shown.

[0044] Fig. 9 These are the discharge charts of the metal-aqueous battery with a dual cell (DC) structure and the metal-aqueous battery with a single cell (SC) structure in Experimental Example 1.

[0045] Fig.10 This is a discharge graph based on the current density of the aqueous metal battery driven by changing the temperature of the first electrolyte in Experimental Example 2.

[0046] Fig.11 This is a discharge graph of the aqueous metal battery driven by changing the temperature of the first electrolyte in Experimental Example 2 at each time point.

[0047] Fig.12 These are the evaluation results of the aqueous metal battery driven by changing the temperature of the second electrolyte in Experimental Example 3.

[0048] Fig.13 This is a discharge chart of the metal aqueous battery driven under conditions 1 to 3 in Experimental Example 4.

[0049] Description of Reference Numerals

[0050] 100: metal aqueous battery; 200: first electrolyte supply part; 300: second electrolyte supply part; 400: first heating unit; 500: second heating unit; DC: dual battery; SC: single battery; CC: current collector; 10: plate; 11: first peripheral surface; 11a: open surface; 12: second peripheral surface; 13: side surface; 14: internal space; 15: opening; 16: first electrolyte inflow part; 17: first electrolyte outflow part; 20: support body; 21: through hole; 30: anode; 40: diaphragm; 50: cathode; 60: cathode gasket; 61: second electrolyte inflow part; 62: second electrolyte outflow part; 70: wire; 80: diaphragm gasket; 90: protective film; 600: pressure applying part; 610: support plate; 620: elastic member; A: first electrolyte; B: second electrolyte; D: plug; G: gap. DETAILED DESCRIPTION

[0051] The above objects, other objects, features and advantages of the present invention can be easily understood through the accompanying drawings and the following preferred embodiments related thereto. However, the present invention is not limited to the embodiments described herein and may also be implemented in other ways. The embodiments described herein are provided to make the disclosed contents complete and to fully convey the concept of the present invention to those skilled in the art.

[0052] When describing each of the accompanying drawings, similar reference numerals are used for similar structural elements. In the accompanying drawings, for the clarity of the present invention, the size of the structural elements is shown to be enlarged than the actual size. Terms such as "first" and "second" can be used to describe a variety of structural elements, but the structural elements are not limited to the terms. The terms are only used to distinguish one structural element from another structural element. For example, without exceeding the scope of protection of the present invention, the first structural element can be named as the second structural element, and similarly, the second structural element can also be named as the first structural element. Unless the context clearly indicates otherwise, the singular expression includes the plural expression.

[0053] In this specification, the terms "including" or "having" are used to specify the existence of features, numbers, steps, actions, structural elements, components or combinations thereof recorded in the specification, but do not preclude the existence or additional possibility of one or more other features, numbers, steps, actions, structural elements, components or combinations thereof. Furthermore, when referring to a layer, film, region, plate or other part being "on" another part, it includes not only the case of being "directly above" but also the case of being separated by other parts. Conversely, when referring to a layer, film, region, plate or other part being "below" another part, it includes not only the case of being "directly below" but also the case of being separated by other parts.

[0054] Unless otherwise stated, all numbers, values ​​and / or expressions representing the amounts of ingredients, reaction conditions, polymer compositions and blends used in this specification refer to approximate values ​​that essentially reflect the various uncertainties of measurement that occur when obtaining these values ​​from other values, and therefore, it should be understood that they are modified by the term "about" in all cases. In addition, when a numerical range is disclosed in this description, such a range is a continuous range, unless otherwise stated, including all values ​​from the minimum value of such range to the maximum value including the maximum value. Furthermore, when such a range quotes an integer, unless otherwise stated, all integers from the minimum value to the maximum value including the maximum value are included.

[0055] Figure 1 The first embodiment of the metal aqueous battery of the present invention is shown. For ease of description and understanding, Figure 1 The first electrolyte A and the second electrolyte B are not shown. Figure 2 This is used to explain the flow of electrolyte in the aqueous metal battery of the present invention.

[0056] The metal aqueous battery may include a double cell (DC), which is formed by stacking a pair of single cells (SC) with cathodes 50 facing each other by inserting a collector CC. The single cell includes an anode 30, a cathode 50, and a separator 40 located between the anode 30 and the cathode 50.

[0057] The current collector CC may be formed of a conductive material, for example, the current collector CC may be formed by plating gold (Au) on a thin plate formed of stainless steel.

[0058] Reference Figure 1 and Figure 2 The single cell SC may include: a plate 10; a plate-shaped support body 20, arranged in an internal space 14 of the plate 10; an anode 30, accommodated between the plate 10 and the support body 20; a separator 40, stacked on the plate 10; a first electrolyte A, accommodated in the internal space 14 of the plate 10; a cathode 50, located on the separator 40; and a cathode gasket 60, located between the separator 40 and the cathode 50, forming a gap G between the separator 40 and the cathode 50; and a second electrolyte B, accommodated in the gap G.

[0059] Figure 3 The plate 10 is shown. The plate 10 may be in the shape of a plate with a predetermined thickness, and includes: a first peripheral surface 11; a second peripheral surface 12 opposite to the first peripheral surface 11; and a side surface 13 connecting the first peripheral surface 11 and the second peripheral surface 12.

[0060] The plate 10 may be formed of a material having no conductivity and excellent physical properties, for example, the plate 10 may be formed of polycarbonate.

[0061] The plate 10 may include an inner space 14 open to the first peripheral surface 11. The inner space 14 opening to the first peripheral surface 11 may mean that a portion of the first peripheral surface 11 is punched through to form an open surface 11a, so that the inner space 14 is connected to the outside.

[0062] The plate 10 may include an opening 15 in a part of the side surface 13 so that the inner space 14 is open to communicate with the outside. Figure 1 An opening 15 may be provided in a part of the upper side of the plate 10 . The anode 30 may be supplied to the inner space 14 through the opening 15 .

[0063] The metal aqueous battery may further include a plug D detachably disposed at the opening 15. As long as the opening 15 can be completely blocked to completely separate the internal space 14 from the outside, the size of the plug D is not particularly limited. On the other hand, the plug D may be made of a material that is non-reactive with the first electrolyte A and the anode 30.

[0064] The plate 10 may include: a first electrolyte inflow portion 16 formed through a portion of the side surface 13 and communicating with the internal space 14; and a first electrolyte outflow portion 17 formed through a predetermined distance from the first electrolyte inflow portion 16 and communicating with the internal space 14. Figure 1 As a reference, the first electrolyte inflow portion 16 may be present on the lower side surface 13, and the first electrolyte outflow portion 17 may be present on the upper side surface 13. Also, the plate 10 may include a plurality of the first electrolyte inflow portion 16 and the first electrolyte outflow portion 17.

[0065] Figure 4A FIG. 2 shows a first embodiment of the support body 20. Figure 1 As shown, the support 20 can be tilted so that the space for accommodating the anode 30 gradually narrows toward the lower side. When the anode 30 is ionized and the size is reduced, it will be neatly stacked toward the lower side. As a result, the contact area between the anode 30 and the support 20 increases, so that the anode 30 can be ionized more easily. When the contact area between the anode 30 and the support 20 increases, the ionization area will increase, so that the current density of the battery can be increased.

[0066] The support body 20 may include a conductive metal and a material having a rigidity capable of bearing the weight of the anode 30. For example, the support body 20 may include a stainless steel mesh.

[0067] The metal aqueous battery may include a lead 70 electrically connecting the support 20 to the current collector CC. The structure of the electrical connection is not particularly limited. For example, the lead portion L may be attached to the inner surface of the opening 15 of the plate 10 in a manner that one end of the support 20 is exposed to the outside, and the support 20 may be arranged in the lead portion L in a manner that one end of the support 20 is in contact with the lead portion L, and then the lead 70 may be connected to one end of the lead portion L.

[0068] The support body 20 may include a plurality of through holes 21 through which the first electrolyte A may move.

[0069] In the support body 20, the anode 30 should not be separated from the space between the plate 10 and the support body 20, so the diameter of the through hole 21 may be smaller than the diameter of the anode 30. Specifically, the diameter of the through hole 21 may be 0.5 mm to 2 mm.

[0070] Figure 4B The second embodiment of the support body 20 is shown. As a preferred embodiment of the support body 20, the diameter of the through hole 21 can be gradually reduced toward the lower side. The purpose of this arrangement is that the anode 30 is reduced in size due to the reaction and moves to the lower side. In this case, the moved smaller anode 30 is prevented from passing through the through hole 21.

[0071] Figure 4C A third embodiment of the support 20 is shown. The through hole 21 may not be present on the lower side of the support 20. This increases the contact surface of the anode, which has been reduced in size due to the reaction, with the support on the lower side, and allows the reaction to occur more rapidly.

[0072] The anode 30 can be used as long as it is a material that is ionized in the first electrolyte and can generate electrons. For example, it can include at least one selected from the group consisting of lithium (Li), sodium (Na), magnesium (Mg), zinc (Zn), aluminum (Al) and combinations thereof. Preferably, the anode 30 may include at least one selected from the group consisting of magnesium (Mg), zinc (Zn), aluminum (Al) and combinations thereof. Magnesium (Mg), zinc (Zn) and aluminum (Al) are stable to water and are therefore preferred in aqueous systems. More preferably, the anode 30 may include at least one selected from the group consisting of zinc (Zn), aluminum (Al) and combinations thereof. Considering the world's reserves and prices, zinc (Zn) and aluminum (Al) are more preferred.

[0073] The anode 30 may be in a spherical, elliptical, cylindrical or other particle shape. When the anode 30 is elliptical, its diameter is the length of the major axis. When the anode 30 is cylindrical, its diameter is the diameter of the bottom surface. The diameter of the anode 30 may be 3 mm to 10 mm. When the diameter of the anode 30 is less than 3 mm, the size is reduced due to ionization, so that the anode 30 can pass through the through hole 21. When the diameter of the anode 30 is greater than 10 mm, the specific surface area of ​​the anode 30 will be reduced, which may reduce the performance of the metal aqueous battery.

[0074] Figure 5 A second embodiment of the aqueous metal battery of the present invention is shown. Figure 1 different, Figure 5 In the embodiment, the anode 30 is in the form of a sheet.

[0075] The aqueous metal battery may include a pressure applying unit 600 received in the inner space 14 of the plate 10 and disposed between the inner surface of the plate 10 and the anode 30 , and the pressure applying unit 600 applies pressure to move the anode 30 toward the separator 40 .

[0076] A plurality of the anodes 30 may be stacked and accommodated between the pressure applying portion 600 and the separator 40 .

[0077] The pressurizing unit 600 presses the anode 30 toward the separator 40 , so that among the plurality of anodes 30 , the anode 30 close to the separator 40 reacts and is consumed.

[0078] The pressure applying part 600 may include: a support plate 610 for applying pressure to the anode 30 ; and an elastic member 620 disposed between the support plate 610 and the plate 10 to provide elastic force to the support plate 610 .

[0079] When the anode 30 near the diaphragm 40 is consumed by the reaction, the support plate 610 presses the anode 30 by the elastic force of the elastic member 620. Therefore, the anode 30 can be closely disposed on the diaphragm 40 side.

[0080] The metal aqueous battery may further include a frame-shaped diaphragm gasket 80 , which is located between the plate 10 and the diaphragm 40 , has a predetermined thickness, and has a through hole formed at the center thereof.

[0081] The diaphragm spacer 80 may support the edge portion of the diaphragm 40 so that the inner space 14 of the plate 10 is expanded by a thickness corresponding to the thickness of the diaphragm spacer 80. The thickness of the diaphragm spacer 80 is not particularly limited and may be 5 mm to 20 mm.

[0082] The metal aqueous battery may further include a protective film 90 . The protective film 90 has a shape corresponding to the open surface 11 a of the plate 10 and is disposed on the open surface 11 a of the plate 10 .

[0083] The protection film 90 may be formed of a material having excellent chemical resistance, such as rubber, resin, silicone, or metal.

[0084] The protective film 90 may be porous. Therefore, the first electrolyte is impregnated in the protective film 90, so that the potassium ions (K + ) or sodium ion (Na + ) etc. can move toward the diaphragm 40.

[0085] The protective film 90 can prevent the diaphragm 40 from sagging. That is, the protective film 90 can play a role of a physical support for the diaphragm 40.

[0086] The separator 40 may include a material having cationic conductivity. For example, the separator 40 may include a perfluorosulfonic acid resin such as Nafion. Therefore, the separator 40 may allow the movement of cations between the anode 30 and the cathode 50 while preventing the movement of the first electrolyte A and the second electrolyte B.

[0087] The separator 40 may include a substance having anionic conductivity. For example, the separator 40 may include at least one selected from the group consisting of Poly(terphenylene), 1,4-diazabicyclo[2,2,2]octane-Poly(ether sulfone), Poly(aryl piperidinium), Poly(phenylene oxide)-block-poly(vinyl benzyl trimethylammonium), and combinations thereof. Therefore, the separator 40 may allow the movement of anions between the anode 30 and the cathode 50 while preventing the movement of the first electrolyte A and the second electrolyte B.

[0088] The thickness of the separator 40 is not particularly limited, and may be, for example, 25 μm to 250 μm.

[0089] The area of ​​the separator 40 may be larger than the area of ​​the open surface 11a of the plate 10. Also, the separator 40 may cover the entire open surface 11a, thereby preventing leakage of the first electrolyte A.

[0090] Figure 6 The cathode gasket 60 is shown. The cathode gasket 60 may be located between the diaphragm 40 and the cathode 50. The cathode gasket 60 may be in the shape of a frame with a through hole formed in the center, supporting the edge portion of the diaphragm 40 to form a gap G between the diaphragm 40 and the cathode 50. The thickness of the cathode gasket 60 may be 5 mm to 20 mm.

[0091] The cathode gasket 60 may include a material that does not react with the second electrolyte B and has chemical resistance. For example, the cathode gasket 60 may include polycarbonate.

[0092] The cathode gasket 60 may include: a second electrolyte inflow portion 61 formed through a portion of the side surface of the cathode gasket 60 and communicating with the gap G; and a second electrolyte outflow portion 62 formed through a portion of the side surface of the cathode gasket 60 at a position separated by a predetermined distance from the second electrolyte inflow portion 61 and communicating with the gap G. For example, Figure 6 As a reference, the second electrolyte inflow portion 61 may be present on the lower side, and the second electrolyte outflow portion 62 may be present on the upper side. In addition, the cathode gasket 60 may include a plurality of the second electrolyte inflow portions 61 and a plurality of the second electrolyte outflow portions 62.

[0093] The cathode 50 may include a noble metal catalyst mounted on a carrier. The type of the carrier is not particularly limited, and for example, may include at least one selected from the group consisting of carbon paper, carbon fiber, carbon felt, carbon black, carbon cloth, metal foam, metal film, and combinations thereof. The type of the noble metal catalyst is not particularly limited, and for example, may include platinum (Pt).

[0094] like Figure 7 As shown, the metal aqueous battery may include a battery stack formed by stacking a plurality of the dual batteries DC. The number of stacked dual batteries DC is not particularly limited and can be appropriately adjusted according to the target current generation amount.

[0095] A technical feature of the present invention is to prevent the passivation of the anode 30 and increase the current generation speed by increasing the temperature of the first electrolyte A and the second electrolyte B in the metal aqueous battery.

[0096] The pH of the first electrolyte A and the second electrolyte B may be as follows:

[0097] -First electrolyte A: pH 14 or above;

[0098] - Second electrolyte B: pH 7 to 9.

[0099] When the pH of the first electrolyte A and the second electrolyte B is within the above range, the reaction may sufficiently occur.

[0100] The first electrolyte A may include an alkali metal hydroxide. Preferably, the first electrolyte A may include at least one selected from the group consisting of potassium hydroxide (KOH), sodium hydroxide (NaOH) and a combination thereof. The concentration of the first electrolyte A may be 3M to 6M. When the concentration of the first electrolyte A is 6M, potassium ions (K + ), sodium ion (Na + ) of a saturated solution, when it is less than 3M, the ionization of the metal is not sufficient, therefore, the concentration of the first electrolyte A is more appropriate within the range of 3M to 6M.

[0101] The temperature of the first electrolyte A may be 40° C. to 80° C. When the temperature of the first electrolyte A is less than 40° C., it is difficult to obtain the effect of preventing the anode 30 from being passivated.

[0102] The second electrolyte B may include hydrogen ions and bicarbonate ions. Preferably, the second electrolyte B may include a 3 ), sodium bicarbonate (NaHCO 3 ) and at least one of the groups consisting of combinations of these.

[0103] The substance supplied from the second electrolyte supply unit 300 described later is sufficient as long as the substance is dissolved in carbon dioxide (CO 2 ) and in the battery interior (gap: G) the pH is 7 to 9 and includes hydrogen ions and bicarbonate ions, and can be any substance. For example, it can be potassium hydroxide, potassium carbonate, potassium bicarbonate, sodium hydroxide, sodium carbonate, sodium bicarbonate.

[0104] The concentration of the second electrolyte B can be 0.5M to 3M. When the concentration of the second electrolyte B is less than 0.5M, the reaction rate will be affected as the pH increases. When the concentration of the second electrolyte B is 3M, potassium ions (K + ), sodium ion (Na + ) is a saturated solution, therefore, the corresponding range will be more appropriate.

[0105] The temperature of the second electrolyte B may be 40° C. to 80° C. When the temperature of the second electrolyte B is within the above numerical range, the internal resistance of the metal aqueous battery can be reduced, and overvoltage can be prevented.

[0106] After the first electrolyte A and the second electrolyte B are preheated to a temperature within the above numerical range, they are provided to the metal aqueous battery. Preferably, the temperature of the first electrolyte A may be the same as or higher than the temperature of the second electrolyte B. Improving the activation of the anode 30 is more important for the overall reaction, so the temperature of the first electrolyte A is more important. Therefore, considering the overall reaction, preferably, the temperature of the first electrolyte A may be equal to or higher than the temperature of the second electrolyte B.

[0107] A heater may be provided outside the metal aqueous battery to increase the temperature of the first electrolyte A and the second electrolyte B. As described below, the temperature may be increased by the first heating unit 400 and the second heating unit 500. A preferred temperature adjustment method of the first electrolyte A and the second electrolyte B will be described below.

[0108] Figure 8 The hydrogen production and carbon dioxide storage system of the present invention is shown. The system may include: the above-mentioned metal aqueous battery 100; a first electrolyte supply unit 200, supplying a first electrolyte to the metal aqueous battery 100; a second electrolyte supply unit 300, supplying a second electrolyte to the metal aqueous battery 100; a first heating unit 400, located between the metal aqueous battery 100 and the first electrolyte supply unit 200, performing heat exchange between the first electrolyte and a heat source; and a second heating unit 500, located between the metal aqueous battery 100 and the second electrolyte supply unit 300, performing heat exchange between the second electrolyte and a heat source.

[0109] The heat of the heat source in the first heating unit 400 is transferred to the first electrolyte, thereby increasing the temperature of the first electrolyte. The heat of the heat source in the second heating unit 500 is transferred to the second electrolyte, thereby increasing the temperature of the second electrolyte. As a non-limiting example, the first heating unit 400 and the second heating unit 500 may include a heat exchanger.

[0110] The type of the heat source is not particularly limited, and may include, for example, waste gas, waste hot water, etc. from power plants, vehicles, landfills, etc.

[0111] Reference Figure 1 , Figure 2 and Figure 8 , the working mode of the system is described below.

[0112] The first electrolyte supply unit 200 supplies the first electrolyte A to the aqueous metal battery 100 through the first electrolyte inflow unit 16. In this case, the first electrolyte A receives heat from the heat source of the first heating unit 400 and is heated to 40°C to 80°C.

[0113] The first electrolyte A flows into the inner space 14 of the plate 10 through the first electrolyte inflow portion 16 .

[0114] When the anode 30 contacts the first electrolyte A, the anode 30 is ionized to generate electrons. The electrons move along the support 20 , the lead L, and the wire 70 to the current collector CC, and are then transferred to the cathode 50 .

[0115] The alkali metal ions generated during the ionization process of the anode 30 are preferably potassium ions (K + ) or sodium ion (Na + ) moves to the cathode 50 through the separator 40.

[0116] The second electrolyte supply unit 300 supplies the second electrolyte B and carbon dioxide to the metal aqueous battery 100 through the second electrolyte inflow unit 61. In this case, the second electrolyte B receives heat from the heat source of the second heating unit 500 and is heated to 40° C. to 80° C. The system may further include a carbon dioxide supply device (not shown) that supplies carbon dioxide to the second electrolyte supply unit 300. Alternatively, the second electrolyte supply unit 300 may also supply an electrolyte in which carbon dioxide is dissolved.

[0117] The second electrolyte B and carbon dioxide are supplied to the cathode 50 through the second electrolyte inflow portion 61. In the cathode 50, the following chemical elution reaction of carbon dioxide occurs.

[0118] CO2 (g)+H 2 O(l)→H + (aq)+HCO 3 - (aq)

[0119] Thereafter, the following hydrogen production reaction occurs in the cathode 50 .

[0120] 2H + (aq)+2e - →H 2 (g)

[0121] Also, as described below, carbon dioxide is stored in the cathode 50 in the form of a salt.

[0122] HCO 3 - (aq)+K + (aq)→KHCO 3 (g)

[0123] HCO 3 -(aq)+Na + (aq)→NaHCO 3 (g)

[0124] The H 2 and KHCO 3 (or NaHCO 3 ) is discharged to the outside of the battery through the second electrolyte outflow portion 62 together with the second electrolyte.

[0125] Hereinafter, another embodiment of the present invention will be specifically described through experimental examples. The following experimental examples are only for illustration to help understand the present invention, and the scope of the present invention is not limited thereto.

[0126] Experimental Example 1

[0127] drive Figure 1 The dual-cell DC was used to evaluate the battery performance. At the same time, a single-cell SC structure metal aqueous battery was prepared to evaluate its battery performance.

[0128] Fig. 9 The discharge diagram of the metal aqueous battery with a dual-cell DC structure and the metal aqueous battery with a single-cell SC structure. The metal aqueous battery with a dual-cell DC structure exhibits a high battery potential at the same current. Therefore, the metal aqueous battery with a dual-cell DC structure of the present invention can stably obtain a higher current.

[0129] Compared with metal aqueous batteries with multiple single cell SC structures, metal aqueous batteries with dual cell DC structures can eliminate and reduce parts in the cathode manifold, current collector, and wire, making it possible to make a more compact battery. In addition, using dual cell DC can reduce the control factors by half compared to controlling multiple single cells SC separately.

[0130] Experimental Example 2

[0131] The temperature of the first electrolyte was changed to 20°C, 40°C, 60°C and 80°C respectively. Figure 1 The metal aqueous battery with a dual cell DC structure is shown. The zinc utilization ratio (ZUR) of each metal aqueous battery is shown in the following Table 1. The zinc utilization ratio is calculated by the following formula.

[0132] ZUR (zinc utilization rate) = specific capacity of zinc / theoretical capacity of zinc

[0133] Table 1

[0134] temperature 20℃ 40℃ 60℃ 80℃ ZUR [%] 25.56 51.89 83.60 87.50

[0135] When the temperature of the first electrolyte was 20° C., a ZUR value of about 25% was exhibited, and when the temperature of the first electrolyte was 80° C., a significantly improved ZUR value of about 87% was exhibited.

[0136] Fig.10 This is a discharge graph of the current density of the aqueous metal battery driven by changing the temperature of the first electrolyte. Fig.11 The discharge graph of the metal aqueous battery at each time of driving by changing the temperature of the first electrolyte. As the temperature of the electrolyte increases, the driving performance and duration are improved.

[0137] Experimental Example 3

[0138] The temperature of the second electrolyte was changed to 20°C, 40°C, 60°C and 80°C respectively. Figure 1 The metal-aqueous battery with a dual-cell DC structure is shown.

[0139] Fig.12 The results of the evaluation of the metal aqueous battery driven by changing the temperature of the second electrolyte. As the temperature of the second electrolyte increases, the overvoltage of the electrode will decrease. Specifically, when the temperature of the second electrolyte rises from 20°C to 40°C, when it rises from 40°C to 80°C, the overvoltage is about 0.05V, confirming that the resistance of the battery decreases.

[0140] Experimental Example 4

[0141] Driven by the following conditions Figure 1The metal-aqueous battery with a dual-cell DC structure is shown.

[0142] Condition 1: First electrolyte temperature 20°C, second electrolyte temperature 20°C

[0143] Condition 2: First electrolyte temperature 80°C, second electrolyte temperature 20°C

[0144] Condition 3: First electrolyte temperature 80°C, second electrolyte temperature 80°C

[0145] Fig.13 The figure is a discharge chart of the metal aqueous battery driven under conditions 1 to 3. Conditions 2 and 3 present similar battery performance. Based on the performance change caused by the increase in electrolyte temperature, the temperature of the first electrolyte has a greater effect on it than the temperature of the second electrolyte.

[0146] The experimental examples and embodiments of the present invention are described in detail above. The protection scope of the present invention is not limited to the above-mentioned experimental examples and embodiments. Various modifications and improvements made by those skilled in the art using the basic concepts of the present invention defined in the accompanying claims are also included in the protection scope of the present invention.

Claims

1. A metal aqueous battery, characterized in that: The metal aqueous battery comprises a bibattery, wherein the bibattery is formed by stacking a pair of single cells with the cathodes facing each other and the collectors inserted therein, wherein the single cell comprises an anode, the cathode, and a separator between the anode and the cathode. The battery cell includes a cathode gasket located between the separator and the cathode and forming a gap between the separator and the cathode.

2. The aqueous metal battery according to claim 1, characterized in that: The single cell includes a plate, the plate is in a plate shape with a predetermined thickness including a first peripheral surface and a second peripheral surface opposite to the first peripheral surface, the plate is located at the periphery of the single cell and includes an inner space open toward the first peripheral surface. The anode is accommodated in the internal space, The diaphragm is stacked on the first peripheral surface and covers an open surface of the internal space.

3. The aqueous metal battery according to claim 2, characterized in that: The board includes: a first electrolyte inflow portion formed in a partial area of ​​a side surface of the plate and communicating with the internal space; and The first electrolyte outflow portion is located at a predetermined distance from the first electrolyte inflow portion and communicates with the internal space.

4. The aqueous metal battery according to claim 2, characterized in that: The anode is in the form of particles, The single cell further includes a support body, which is obliquely disposed in the internal space and includes a plurality of through holes. The anode is received between the inner surface of the plate and the support, The diameter of the through hole is smaller than the diameter of the anode.

5. The aqueous metal battery according to claim 2, characterized in that: The anode is in the form of a sheet. The single cell further includes a pressure applying portion that is accommodated in the internal space and is disposed between an inner surface of the plate and the anode, and that applies pressure to move the anode toward the separator.

6. The aqueous metal battery according to claim 1, characterized in that: The anode includes at least one selected from the group consisting of lithium, sodium, magnesium, zinc, aluminum, and combinations thereof.

7. The aqueous metal battery according to claim 1, characterized in that: The aqueous metal battery further includes a wire electrically connecting the anode to a current collector.

8. The aqueous metal battery according to claim 1, characterized in that: The cathode comprises a noble metal catalyst mounted on a support.

9. The metal aqueous battery according to claim 2, characterized in that: The metal aqueous battery further includes a diaphragm gasket, which is located between the plate and the diaphragm and has a predetermined thickness. The diaphragm gasket is in a frame shape with a through hole formed in the center. The diaphragm spacer supports an edge portion of the diaphragm so that an inner space of the plate is expanded by a thickness corresponding to a thickness of the diaphragm spacer.

10. The aqueous metal battery according to claim 2, characterized in that: The aqueous metal battery further includes a protective film, which is a porous protective film having a shape corresponding to the open surface of the plate and is disposed on the open surface of the plate.

11. The aqueous metal battery according to claim 1, characterized in that: The separator includes a substance having cation conductivity or a substance having anion conductivity.

12. The aqueous metal battery according to claim 1, characterized in that: The cathode gasket is in the shape of a frame with a through hole formed in the center, and supports the edge portion of the diaphragm to form the gap. The cathode gasket comprises: a second electrolyte inflow portion formed in a portion of a side surface of the cathode gasket and communicating with the gap; and The second electrolyte outflow portion is provided in a part of the side surface of the cathode gasket at a position separated by a predetermined distance from the second electrolyte inflow portion and communicates with the gap.

13. The aqueous metal battery according to claim 2, characterized in that: The aqueous metal battery further comprises: A first electrolyte is contained in the inner space of the plate; and The second electrolyte is accommodated in the gap.

14. The aqueous metal battery according to claim 13, characterized in that: The first electrolyte includes an alkali metal hydride.

15. The aqueous metal battery according to claim 13, characterized in that: The second electrolyte includes hydrogen ions and bicarbonate ions.

16. The aqueous metal battery according to claim 13, characterized in that: The temperature of the first electrolyte is 40°C to 80°C, The temperature of the second electrolyte is 40°C to 80°C.

17. The aqueous metal battery according to claim 13, characterized in that: The temperature of the first electrolyte is the same as the temperature of the second electrolyte, or the temperature of the first electrolyte is higher than the temperature of the second electrolyte.

18. The aqueous metal battery according to claim 1, characterized in that: The metal aqueous battery includes a battery stack formed by stacking a plurality of bi-batteries.

19. A hydrogen production and carbon dioxide storage system, characterized in that: include: The aqueous metal battery according to any one of claims 1 to 18; a first electrolyte supply unit for supplying a first electrolyte to the aqueous metal battery; a second electrolyte supply unit, supplying a second electrolyte to the aqueous metal battery; A first heating unit is located between the metal aqueous battery and the first electrolyte supply unit; as well as The second heating unit is located between the metal aqueous battery and the second electrolyte supply unit.

20. The hydrogen production and carbon dioxide storage system according to claim 19, characterized in that: The first heating unit includes a first heat exchanger for exchanging heat between the first electrolyte and a heat source. The second heating unit includes a second heat exchanger that exchanges heat between the second electrolyte and a heat source.

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