KR101955695B1 - Secondary battery using carbon dioxide and complex electric power generation system having the same - Google Patents

Abstract

According to the present invention, a secondary battery capable of charging and discharging is provided. The secondary battery comprises: a cathode part having a first aqueous solution accommodated in a first accommodating space and a cathode which is at least partially immersed in the first aqueous solution; an anode part having a basic second aqueous solution accommodated in a second accommodating space and a metallic anode which is at least partially immersed in the second aqueous solution; and a salt bridge connecting the first aqueous solution and the second aqueous solution. The carbon dioxide gas is introduced into the first aqueous solution during the discharge, and hydrogen ions and bicarbonate ions are generated by a reaction between the water of the first aqueous solution and the carbon dioxide gas. The hydrogen ions and electrons of the cathode are combined to generate hydrogen gas.

Description

TECHNICAL FIELD [0001] The present invention relates to a secondary battery using carbon dioxide and a hybrid power generation system using the same. BACKGROUND ART [0002]

The present invention relates to a secondary battery, and more particularly, to a secondary battery using carbon dioxide and a combined power generation system having the same.

In recent years, greenhouse gas emissions have been continuously increasing along with industrialization, and carbon dioxide is the largest proportion of greenhouse gases. CO2 emissions by industry type are highest in energy supply sources such as power plants, and carbon dioxide generated in cement / steel / refining industries including power generation accounts for about half of the global generation. The carbon dioxide conversion / utilization fields can be classified into chemical conversion, biological conversion, and direct utilization. The technical categories can be classified into catalyst, electrochemical, bioprocess, light utilization, inorganic (carbonation), and polymer. Because carbon dioxide is generated in a variety of industries and processes, and one technique can not achieve carbon dioxide reduction, a variety of approaches are needed to reduce carbon dioxide.

Currently, Department of Energy (DOE) of the US Department of Energy is pursuing multi-technology development with interest in CCUS technology, which is a combination of Carbon Capture & Storage (CCS) and CC & Utilization (CCU) technologies to reduce carbon dioxide. CCUS technology is recognized as an effective GHG mitigation measure, but faces high investment costs, the potential for release of toxic collectors to air, and low technology maturity. Also, from an energy and climate policy perspective, CCUS provides a means to substantially reduce greenhouse gas emissions, but there are many complementary aspects to the realization of technology. Therefore, it is required to develop a new concept of breakthrough technology that more efficiently captures, stores and utilizes carbon dioxide.

As a prior art document related to the technical field of the present invention, Japanese Patent Application Laid-Open No. 10-2015-0091834 discloses a liquid crystal display comprising a liquid cathode portion containing a sodium mixed solution solution and a cathode impregnated in a sodium-containing solution; An anode portion including a liquid organic electrolyte, an anode impregnated in the liquid organic electrolyte, and a negative electrode active material located on the anode surface; And a solid electrolyte disposed between the cathode portion and the negative portion; And a hydrogen discharging portion connected to the cathode portion and discharging hydrogen generated in the cathode portion during discharging to the outside.

Korean Patent Laid-Open Publication No. 10-2015-0091834 entitled " Carbon Dioxide Collecting Secondary Battery "

An object of the present invention is to provide a secondary battery using carbon dioxide, which is a greenhouse gas, as fuel.

Another object of the present invention is to provide a secondary battery in which various metals can be used as an anode electrode while using carbon dioxide as fuel.

Another object of the present invention is to provide a water-based secondary battery which is capable of simultaneously producing hydrogen as an environment-friendly fuel with high purity while using carbon dioxide as a fuel.

Another object of the present invention is to provide a water-based secondary battery which can produce sodium hydrogencarbonate while using carbon dioxide as a fuel.

According to an aspect of the present invention, there is provided a secondary battery capable of charging and discharging, comprising: a first aqueous solution contained in a first containing space; A cathode portion having a cathode; An anode portion including a basic aqueous solution contained in a second accommodation space and an anode of a metal at least partially immersed in the second aqueous solution; And a salt bridge connecting the first aqueous solution and the second aqueous solution, wherein a carbon dioxide gas is introduced into the first aqueous solution during discharge, and a reaction between the water of the first aqueous solution and the carbon dioxide gas causes hydrogen ions and bicarbonate ions And a hydrogen gas is generated by combining hydrogen ions and electrons of the cathode.

According to another aspect of the present invention, there is provided a secondary battery capable of charging and discharging, comprising: a first aqueous solution contained in a first containing space; A cathode portion having a cathode; An anode portion including a basic aqueous solution contained in a second accommodation space and an anode of a metal at least partially immersed in the second aqueous solution; A salt bridge connecting the first aqueous solution and the second aqueous solution; And the first aqueous solution contained in a third containing space communicated with the first accommodating space, wherein carbon dioxide gas is introduced into the first aqueous solution of the third accommodating space at the time of discharging, The hydrogen ions and the bicarbonate ions are generated by the reaction of the water of the aqueous solution and the carbon dioxide gas and the hydrogen ions and the electrons of the cathode are combined in the cathode portion to generate hydrogen gas, The non-ionized carbon dioxide gas in the carbon dioxide gas flowing into the first aqueous solution of the first aqueous solution is not separated from the first aqueous solution and is not supplied to the cathode.

According to another aspect of the present invention, there is provided a secondary battery having the above-described configuration for generating hydrogen by using carbon dioxide as a fuel during a discharge process. A reformer for producing hydrogen-rich reformed gas from the hydrogen-containing fuel and generating carbon dioxide as a by-product; A fuel cell supplied with the reformed gas generated from the reformer as fuel; And a carbon dioxide supply unit for supplying carbon dioxide generated in the reformer to the secondary battery.

According to another aspect of the present invention, there is provided a secondary battery having the above-described configuration for generating hydrogen by using carbon dioxide as a fuel during a discharge process. A reformer for producing a hydrogen-rich reformed gas from the hydrogen-containing flue; A fuel cell supplied with the reformed gas produced from the reformer as fuel; And a hydrogen supply unit for additionally supplying hydrogen generated in the secondary battery as fuel of the fuel cell.

According to another aspect of the present invention, there is provided a secondary battery having the above-described configuration for generating hydrogen by using carbon dioxide as a fuel during a discharge process. A reformer for producing hydrogen-rich reformed gas from the hydrogen-containing fuel and generating carbon dioxide as a by-product; A fuel cell supplied with the reformed gas produced from the reformer as fuel; A carbon dioxide supply unit for supplying carbon dioxide generated in the reformer to the secondary battery; And a hydrogen supply unit for additionally supplying hydrogen generated in the secondary battery as fuel for the fuel cell.

According to the present invention, all of the objects of the present invention described above can be achieved. Specifically, by connecting the aqueous solution in which the cathode is immersed and the aqueous solution in which the anode is immersed with the brine, carbon dioxide is injected into the aqueous solution in which the cathode is immersed to generate electricity and hydrogen, and various metals can be used as the anode.

In addition, in the case of using a solution containing a sodium ion as a salt brine, a sodium carbonate solid product in baking soda form can additionally be obtained.

In addition, since the carbon dioxide processing unit is provided to prevent the carbon dioxide not dissolved in the aqueous solution from being supplied to the cathode, high purity hydrogen can be produced at the cathode during the discharge.

1 is a schematic diagram illustrating a discharge process of a secondary cell using carbon dioxide according to an embodiment of the present invention.
FIG. 2 is a view showing a schematic configuration of a hybrid power generation system having a secondary cell using carbon dioxide according to an embodiment of the present invention. Referring to FIG.
3 is a schematic view illustrating a discharge process of a secondary cell using carbon dioxide according to another embodiment of the present invention.

Hereinafter, the configuration and operation of the embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a configuration of a secondary cell using carbon dioxide according to an embodiment of the present invention. Referring to FIG. 1, a secondary battery 100 according to an embodiment of the present invention includes a cathode 110, an anode 150, and a brassiere (not shown) connecting the cathode 110 and the anode 150 salt bridge 190. The secondary battery 100 uses carbon dioxide gas (CO ₂ ), which is a greenhouse gas, as a raw material during the discharge process, and produces hydrogen (H ₂ ), which is an environmentally friendly fuel.

The cathode 110 has a first aqueous solution 115 contained in the first containing space 111 and a cathode 118 partially immersed in the first aqueous solution 115. In the first aqueous solution 115, one end of the salt bridge 190 is locked. As the first aqueous solution 115, an alkaline aqueous solution (in this embodiment, 1 M KOH strongly basic solution is used which is eluted with CO ₂ ), seawater, tap water, and distilled water can be used. The cathode 118 may be a carbon paper, a carbon fiber, a carbon felt, a carbon cloth, a metal foil, a metal thin film, or a combination thereof, and a platinum catalyst may be used as an electrode for forming an electric circuit. In the case of the catalyst, in addition to the platinum catalyst, it includes all other catalysts that can be generally used as an oxygen generating reaction (HER) catalyst such as a carbon-based catalyst, a carbon-metal complex catalyst, and a perovskite oxide catalyst. The cathode 110 has a first inlet 112 and a first outlet 113 communicating with the first housing space 111. The first inlet 112 is positioned below the first housing space 111 so as to be located below the water surface of the first aqueous solution 115. The first outlet 113 is positioned above the first accommodation space 111 so as to be located above the water surface of the first aqueous solution 115. Carbon dioxide used as fuel in the discharge process flows into the first accommodation space 111 through the first inlet 112, and the first aqueous solution 115 can also be introduced when necessary. The gas generated during the charging / discharging process is discharged to the outside through the first outlet 113. Although not shown, the inlet 112 and the outlet 113 can be selectively opened and closed at appropriate timings by a valve or the like during charging and discharging. At the cathode 110, a carbon dioxide elution reaction occurs during the discharge process.

The anode portion 150 includes a second aqueous solution 155 contained in the second containing space 151 and an anode 158 at least partially submerged in the second aqueous solution 155. In the second aqueous solution 155, one end of the salt bridge 190 is locked. As the second aqueous solution 155, a high-concentration alkali solution is used, for example, 1 M KOH or 6 M KOH may be used. The anode 158 is a metal electrode that forms an electric circuit, and zinc (Zn) or aluminum (Al) is used for the anode 158 in this embodiment. As the anode 158, an alloy including zinc or aluminum may be used.

Both ends of the salt bridge 190 are immersed in the first aqueous solution 115 and the second aqueous solution 155, respectively. As an internal solution of the salt lance 190, a conventionally used internal salt solution such as potassium chloride (KCl) and sodium chloride (NaCl) may be used.

Now, the discharging process of the secondary battery 100 described above as the configuration center will be described in detail. 1, a discharge process of the secondary battery 100 is also shown. Referring to FIG. 1, carbon dioxide is injected into the first aqueous solution 115 through the first inlet 112, and a chemical elution reaction of carbon dioxide is performed at the cathode 110 as shown in the following Reaction Scheme 1.

[Reaction Scheme 1]

H ₂ O (l) + CO ₂ (g)? H ⁺ (aq) + HCO ₃ ^- (aq)

That is, in the cathode unit 110, the carbon dioxide (CO ₂ ) supplied to the cathode unit 110 reacts with the hydrogen cation (H ⁺ ) and the bicarbonate (H ₂ O) through the spontaneous chemical reaction with the water HCO ₃ ^- ).

In the cathode portion 110, an electrical reaction as shown in the following Reaction Scheme 2 is performed.

[Reaction Scheme 2]

2H ⁺ (aq) + 2e ^- ? H ₂ (g)

That is, in the cathode 110, hydrogen cations H ⁺ receive electrons e ^- , and hydrogen (H ₂ ) gas is generated. The generated hydrogen (H ₂ ) gas is discharged to the outside through the first outlet 113.

In addition, in the cathode portion 110, a complex hydrogen generating reaction as shown in the following Reaction Scheme 3 is performed.

[Reaction Scheme 3]

2H ₂ O (l) + 2CO ₂ (g) + 2e ^- ? H ₂ (g) + 2HCO ₃ ^- (aq)

In the anode part 150, when the anode 158 is zinc (Zn), an oxidation reaction is performed as in the following reaction formula (4).

[Reaction Scheme 4]

Zn + 4OH ^- ? Zn (OH) ₄ ^{2 -} + 2e ^- (E ⁰ = -1.25 V)

Zn (OH) ₄ ^{2 -} > ZnO + H ₂ O + 2OH ^-

As a result, when the anode 158 is zinc (Zn), the overall reaction formula in the discharge process is as shown in the following Reaction Scheme 5.

[Reaction Scheme 5]

Zn + 2CO ₂ + 2H ₂ O + 2OH ^- ? ZnO + 2HCO ₃ ^- (aq) + H ₂ (g) (E ⁰ = 1.25 V)

If the anode 158 in the anode portion 150 is aluminum (Al), the oxidation reaction as shown in the following Reaction Scheme 6 is performed.

[Reaction Scheme 6]

Al + 3OH ^- ? Al (OH) ₃ ^{+ 3e - (E 0 = -2.31} V)

As a result, when the anode 158 is aluminum (Al), the overall reaction formula in the discharge process is as shown in the following Reaction Scheme 7.

[Reaction Scheme 7]

2Al + 6CO ₂ + 6H ₂ O + 6OH ^- ? 2Al (OH) ₃ + 6HCO ₃ ^- (aq) + 3H ₂ (g) (E ⁰ = 2.31 V)

As a result, as shown in [Reaction Scheme 5] and Reaction Scheme 7, hydrogen ions produced by the carbon dioxide eluted in the first aqueous solution 115 at the time of discharging receive electrons from the cathode 118, And is discharged through the first outlet 113, and the metal anode 158 is changed to an oxide form. As the discharge progresses, HCO ₃ ^- (bicarbonate ion) is generated in the first aqueous solution 115. When the internal solution of the salt bridge 190 contains sodium ions (Na ⁺ ) such as NaCl, Sodium ions are diffused from the bristles 190 to match and present as ions in the form of an aqueous solution of sodium hydrogencarbonate (NaHCO ₃ ). When this solution is dried, a sodium carbonate solid product in baking soda form is additionally obtained.

FIG. 2 is a view showing a schematic configuration of a hybrid power generation system having a secondary cell using carbon dioxide according to an embodiment of the present invention. Referring to FIG. Referring to FIG. 2, a combined power generation system 1000 according to an embodiment of the present invention includes a secondary battery 100 (100) in which carbon dioxide gas (CO ₂ ) is discharged as a fuel and hydrogen gas (H ₂ ) A reformer 300 for producing hydrogen-rich reformed gas from the hydrogen-containing fuel and additionally generating carbon dioxide gas (CO ₂ ), a fuel cell 200 for producing electricity using hydrogen and oxygen, A carbon dioxide supply unit 400 for supplying carbon dioxide gas generated in the reformer 300 to the secondary battery 100, a hydrogen supply unit 500 for supplying hydrogen gas generated in the secondary battery 100 to the fuel cell, And a reformed gas supply unit 600 for supplying reformed gas produced in the fuel cell 200 to the fuel cell 200.

The secondary battery 100 is a secondary battery 100 described above with reference to FIG. 1. As described in detail with reference to FIG. 1, a carbon dioxide gas is used as a fuel and a hydrogen gas is generated during a discharge process. The carbon dioxide gas supplied to the secondary battery 100 is carbon dioxide gas generated in the reformer 300 and supplied through the carbon dioxide supply unit 400. The hydrogen gas generated in the secondary battery 100 is supplied to the fuel cell 200 by the hydrogen supply unit 500.

The reformer 300 produces hydrogen-rich reformed gas from the hydrogen-containing fuel and additionally generates carbon dioxide gas. For this purpose, in the present embodiment, the reformer 300 is a methane-steam reformer that produces hydrogen (H ₂ ) by the reforming reaction of methane (CH ₄ ) and water vapor (H ₂ O).

 The methane-steam reformer 300 takes up a considerable portion of the hydrogen production process due to its advantages of low process costs and mass production capability. The following Scheme 8 relates to the reforming reaction of the methane-steam reformer 300.

[Reaction Scheme 8]

CH ₄ + H ₂ O -> CO + 3H ₂

CO + H ₂ O - > CO ₂ + H ₂

That is, carbon monoxide (CO) and hydrogen are produced by the chemical reaction between methane and water vapor, and hydrogen can be finally produced by the chemical reaction between carbon monoxide and water vapor continuously. The hydrogen produced in the methane-steam reformer 300 is supplied as fuel to the fuel cell 200 or the like by the reformed gas supply unit 600.

However, the methane-steam reforming unit 300 has many advantages as described above. However, as can be seen from the reaction formula (8), it is necessary to supply steam from the outside for the operation of the process, There is a problem that carbon dioxide, which is a main cause of environmental problems, is generated. However, in the case of the present invention, the carbon dioxide generated in the methane-steam reformer 300 is discharged to the atmosphere or transferred to the carbon dioxide supplying unit 400 for discharging reaction of the secondary battery 100 Steam reformer 300 can be solved by transferring the secondary battery 100 to the water-based secondary battery 100, and the problem of generation of carbon dioxide, which is a necessary pit in operating the methane-steam reformer 300, The redundant process can be omitted. Since the methane-steam reformer 300 is a well-known technology, detailed description thereof will be omitted.

The fuel cell 200 generates water by chemical reaction between hydrogen and oxygen, and generates electrical energy. The fuel cell 200 has many advantages in terms of environment friendliness, but it must receive hydrogen extracted from the methane-steam reformer 300 and the like. However, in the case of the present invention, since the fuel cell 200 is constructed as one system with the secondary battery 100, the efficiency can be remarkably improved by receiving the hydrogen gas generated in the discharge process of the secondary battery 100 .

The carbon dioxide supplying unit 400 supplies the carbon dioxide gas generated as a by-product in the reformer 300 to the water-based secondary battery 100.

The hydrogen supply unit 500 supplies hydrogen gas generated as a by-product in the discharge process of the secondary battery 100 to the fuel of the fuel cell 200.

The reformed gas supply unit 600 supplies reformed gas produced by the reformer 300 to the fuel of the fuel cell 200.

3 is a schematic view illustrating a discharge process of a secondary cell using carbon dioxide according to another embodiment of the present invention. 3, the secondary battery 100a includes a cathode unit 110, an anode unit 150, a salt bridge 190 connecting the cathode unit 110 and the anode unit 150, A carbon dioxide processing unit 120, a carbon dioxide circulation supply unit 130, and a connection pipe 140 for connecting the cathode unit 110 and the carbon dioxide processing unit 120. The cathode part 110, the anode part 150, and the brassiere 190 are the same as those described in the embodiment shown in FIG. 1, so a detailed description thereof will be omitted.

The carbon dioxide processing unit 120 includes a first aqueous solution 115 contained in the third storage space 121 and being an aqueous solution same as the first aqueous solution 115 of the cathode unit 110. The carbon dioxide processing unit 120 is provided with a second inlet 222 through which carbon dioxide flows into the third containing space 121, a communication port 223 through which the connecting pipe 140 is connected, A second outlet 224 is formed.

The second inlet port 222 is located above the communication port 223 in the third containing space 121 and below the surface of the second outlet port 224 and the first aqueous solution 115. The carbon dioxide gas used as fuel in the discharge process flows into the third accommodation space 121 through the second inlet port 222. [ The first aqueous solution 115 may also be supplied through the second inlet 222 as needed. The second inlet port 222 and the first outlet port 113 can be selectively opened and closed at appropriate times by a valve or the like during charging and discharging.

The communication port 223 is located below the second inlet 222 in the third accommodation space 121 and the connection pipe 140 is connected to the communication port 223. The third accommodation space 121 communicates with the first accommodation space 111 through the communication hole 223.

The second outlet 224 is located above the water surface of the second inlet 222 and the first aqueous solution 115 in the third housing space 121. The carbon dioxide gas which is not dissolved in the first aqueous solution 115 in the third accommodation space 121 through the second outlet 224 and is not ionized is discharged to the outside. The carbon dioxide gas discharged through the second outlet 224 is supplied to the second inlet 222 through the carbon dioxide circulation supply unit 130.

The carbon dioxide circulating and supplying unit 130 circulates the carbon dioxide gas discharged through the second outlet 224 to the second inlet 222 and supplies the carbon dioxide gas again.

The connection pipe 140 connects the first inlet 112 of the first accommodation space 111 and the communication hole 223 of the third accommodation space 121. The first accommodating space 111 and the third accommodating space 121 are communicated with each other through the connection passage 141 formed in the connection pipe 140. [

The carbon dioxide gas which is not dissolved in the first aqueous solution 115 of the carbon dioxide flowing into the third accommodation space 121 of the carbon dioxide processing unit 120 through the second inlet port 222 is not ionized, The water is collected in the space above the water surface of the first aqueous solution 115 in the third storage space 121 and then discharged through the second discharge port 224 and discharged through the second discharge port 224 The discharged carbon dioxide gas is supplied to the third accommodation space 121 through the second inlet 222 by the carbon dioxide circulation supply unit 130 and recycled. The carbon dioxide gas which is not dissolved in the first aqueous solution 115 and is not ionized in the third storage space 121 of the carbon dioxide processing unit 120 is introduced into the first storage space 111 of the cathode unit 110 It is possible to discharge high purity hydrogen without mixing carbon dioxide through the first outlet 113. [

Although the present invention has been described with reference to the above embodiments, the present invention is not limited thereto. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

100, 100a: secondary battery 110: cathode part
111: first accommodation space 112: first inlet
113: first outlet 115: first aqueous solution
118: cathode 120: carbon dioxide processor
121: third accommodation space 122: second inlet
123: communication port 124: second outlet
130: carbon dioxide circulation supply unit 140: connection pipe
150: anode part 151: second accommodation space
155: second aqueous solution 158: anode
190: brassiere 200: fuel cell
300: reformer 400: carbon dioxide supplier
500: hydrogen supply part 600: reformed gas supply part
1000: Multiple battery system

Claims (15)

delete In a secondary battery capable of charging and discharging,
A cathode portion having a first aqueous solution accommodated in a first containing space and a cathode partially immersed in the first aqueous solution;
An anode portion including a basic aqueous solution contained in a second accommodation space and an anode of a metal at least partially immersed in the second aqueous solution;
Connecting the first aqueous solution and the second aqueous solution, the internal solution comprising a salt bridge comprising sodium ions; And
And a first aqueous solution contained in a third accommodation space communicating with the first accommodation space,
Wherein the carbon dioxide processing unit is provided with a second inlet which is located below the water surface of the first aqueous solution in the third containing space and into which carbon dioxide gas flows,
Wherein the communication hole formed in the third accommodation space to communicate with the first accommodation space is located below the second inlet,
A second outlet is formed in the carbon dioxide treatment section above the water surface of the first aqueous solution in the third accommodation space,
The carbon dioxide gas is introduced into the first aqueous solution in the third accommodation space to generate hydrogen ions and bicarbonate ions by the reaction of the water of the first aqueous solution and the carbon dioxide gas and the generated hydrogen ions and the bicarbonate ions Is moved to the cathode portion through the communication hole,
In the cathode portion, electrons moved from the anode to the cathode and the hydrogen ions combine to generate hydrogen gas,
The cathode portion is formed with a first discharge port located above the water surface of the first aqueous solution accommodated in the first accommodation space so that the hydrogen gas generated during the discharge is discharged,
In the carbon dioxide processing unit, the carbon dioxide gas that is not ionized in the carbon dioxide gas flowing into the first aqueous solution in the third accommodation space from the second inlet of the carbon dioxide gas is supplied to the communication hole And the second cathode is discharged to the outside through the second outlet,
And a carbon dioxide circulation supply unit for recycling the carbon dioxide gas discharged through the second outlet to a second inlet of the carbon dioxide gas. delete delete delete delete delete delete delete The method of claim 2,
Wherein the metal is zinc or aluminum. A secondary battery that generates hydrogen by using carbon dioxide as a fuel during a discharge process;
A reformer for producing hydrogen-rich reformed gas from the hydrogen-containing fuel and generating carbon dioxide as a by-product;
A fuel cell supplied with the reformed gas generated from the reformer as fuel; And
And a carbon dioxide supply unit for supplying carbon dioxide generated in the reformer to the secondary battery,
The secondary battery is the secondary battery according to claim 2. The method of claim 11,
And a hydrogen supplier for supplying hydrogen generated in the secondary battery to the fuel of the fuel cell. A secondary battery that generates hydrogen by using carbon dioxide as a fuel during a discharge process;
A reformer for producing a hydrogen-rich reformed gas from the hydrogen-containing flue;
A fuel cell supplied with the reformed gas produced from the reformer as fuel; And
And a hydrogen supply unit for additionally supplying hydrogen generated in the secondary battery to the fuel of the fuel cell,
The secondary battery is the secondary battery according to claim 2. A secondary battery that generates hydrogen by using carbon dioxide as a fuel during a discharge process;
A reformer for producing hydrogen-rich reformed gas from the hydrogen-containing fuel and generating carbon dioxide as a by-product;
A fuel cell supplied with the reformed gas produced from the reformer as fuel;
A carbon dioxide supply unit for supplying carbon dioxide generated in the reformer to the secondary battery; And
And a hydrogen supply unit for additionally supplying hydrogen generated in the secondary battery to the fuel of the fuel cell,
The secondary battery is the secondary battery according to claim 2. 15. The method of claim 14,
Wherein the reformer is a methane-steam reformer that produces hydrogen by a reforming reaction of methane (CH ₄ ) and water vapor (H ₂ O).

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