WO2022114926A1 - 바나듐 레독스 흐름 전지용 전해액의 제조방법 - Google Patents
바나듐 레독스 흐름 전지용 전해액의 제조방법 Download PDFInfo
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- WO2022114926A1 WO2022114926A1 PCT/KR2021/017901 KR2021017901W WO2022114926A1 WO 2022114926 A1 WO2022114926 A1 WO 2022114926A1 KR 2021017901 W KR2021017901 W KR 2021017901W WO 2022114926 A1 WO2022114926 A1 WO 2022114926A1
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- Prior art keywords
- ion solution
- vanadium ion
- vanadium
- electrolyte
- cathode
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 85
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 33
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 229910001456 vanadium ion Inorganic materials 0.000 claims abstract description 123
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000000243 solution Substances 0.000 claims description 104
- 238000006722 reduction reaction Methods 0.000 claims description 36
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 235000006408 oxalic acid Nutrition 0.000 claims description 9
- 239000008151 electrolyte solution Substances 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 claims description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 6
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine hydrate Chemical compound O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 235000019253 formic acid Nutrition 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 11
- 230000003647 oxidation Effects 0.000 description 10
- 238000007254 oxidation reaction Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 238000007086 side reaction Methods 0.000 description 6
- 239000006227 byproduct Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 239000011149 active material Substances 0.000 description 3
- -1 hydrogen ions Chemical class 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000003929 acidic solution Substances 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Chemical compound BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229920000557 Nafion® Polymers 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- VLOPEOIIELCUML-UHFFFAOYSA-L vanadium(2+);sulfate Chemical compound [V+2].[O-]S([O-])(=O)=O VLOPEOIIELCUML-UHFFFAOYSA-L 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/08—Fuel cells with aqueous electrolytes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0002—Aqueous electrolytes
- H01M2300/0005—Acid electrolytes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0002—Aqueous electrolytes
- H01M2300/0005—Acid electrolytes
- H01M2300/0011—Sulfuric acid-based
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Definitions
- the present invention relates to a method for preparing an electrolyte for a vanadium redox flow battery.
- the redox flow battery means an oxidation/reduction battery that can directly convert the chemical energy of an active material into electrical energy, and stores new and renewable energy with high output fluctuations depending on external environments such as sunlight and wind power to produce high-quality power. It is an energy storage system that can be converted. Specifically, in a redox flow battery, an electrolyte including an active material causing an oxidation/reduction reaction circulates between the electrode and the storage tank, and charging/discharging is performed.
- redox flow battery varies depending on the active material used in the electrolyte.
- a vanadium redox flow battery and a zinc/bromine redox flow battery are known. As it occupies the highest price ratio among parts, lowering the price of electrolyte is essential to secure price competitiveness of vanadium redox flow batteries.
- Such an electrolyte may be prepared by using an electrolyte containing a pentavalent vanadium ion solution and using an electrolysis or a metal reducing agent.
- Patent Document 1 an electrolyte solution was prepared through three electrolytic reactions using expensive vanadium sulfate (VOSO 4 ) as a starting material for producing an electrolyte solution.
- VOSO 4 vanadium sulfate
- Patent Document 2 discloses a method for preparing a vanadium electrolyte using poorly soluble V 2 O 5 and a stack, and zinc metal (Zn) is used as a reducing agent to control the oxidation number.
- zinc metal Zinc
- the zinc metal causes a rapid reduction reaction, it remains in an ionic state in the electrolyte solution, and thus there is a disadvantage in that a side reaction may occur in the stack.
- by-products such as CO 2 gas may be generated, and if this is not removed, there is a problem in that the life of the stack and the quality of the produced electrolyte may also be reduced.
- an electrolyte containing a tetravalent vanadium ion solution is injected into a vanadium redox flow battery to undergo a charging process. That is, when an electrolyte containing a tetravalent vanadium ion solution is injected into the positive and negative poles of the vanadium redox flow battery and charged, the anode is converted to pentavalent, and the cathode is converted to trivalent.
- a 3.5 valence electrolyte solution can be prepared.
- Patent Document 1 Korean Patent Publication No. 10-1415538
- Patent Document 2 Korean Patent Publication No. 10-1130575
- the electrolyte can be continuously manufactured by reusing the surplus pentavalent vanadium ion solution, and the production cost of the electrolyte can be lowered by not leaving the surplus electrolyte, and side reactions and gas generation due to the surplus reducing agent in the solution are prevented during production.
- a method for producing an electrolyte for a vanadium redox flow battery capable of improving the life of a stack and the quality of the produced electrolyte.
- One embodiment of the present invention is,
- the first vanadium solution flows into the anode from the first anode electrolyte tank and is then oxidized to produce a second vanadium ion solution, and the first vanadium ion solution flows into the cathode from the first cathode electrolyte tank and is reduced A third vanadium ion solution is generated;
- It provides a method for producing an electrolyte for a vanadium redox flow battery comprising a.
- the excess vanadium ion solution generated at the positive electrode of the stack is reduced and reused in a reduction reactor, so that the electrolyte can be continuously prepared, and the surplus electrolyte is not left in the electrolyte Manufacturing cost can be lowered.
- the reducing agent when used in a separate reduction reactor, by removing the gas that is present and generated in the reduction reactor, side reactions caused by the reducing agent and gas in the electrolyte can be reduced, so that the life of the stack and the production of the electrolyte It has the effect of improving quality.
- FIG. 1 is a schematic diagram showing the flow of a method for preparing an electrolyte for a vanadium redox flow battery according to an embodiment of the present invention.
- One embodiment of the present invention is,
- the first vanadium solution flows into the anode from the first anode electrolyte tank and is then oxidized to produce a second vanadium ion solution, and the first vanadium ion solution flows into the cathode from the first cathode electrolyte tank and is reduced A third vanadium ion solution is generated;
- It provides a method for producing an electrolyte for a vanadium redox flow battery comprising a.
- a first vanadium ion solution is prepared.
- the first vanadium ion solution may be prepared by mixing a vanadium precursor, a reducing agent, and an acidic solution.
- the vanadium precursor may be at least one selected from the group consisting of V 2 O 5 , VOSO 4 , NH 4 VO 3 and V 2 O 4 .
- the acidic solution is preferably at least one selected from the group consisting of sulfuric acid, hydrochloric acid, nitric acid and phosphoric acid, but if it is a strong acid, it may be used without limitation.
- the reducing agent is preferably at least one selected from the group consisting of formic acid, formaldehyde, methanol, ethanol, oxalic acid and ammonium hydroxide, but any material that does not leave impurities other than gaseous form may be used without limitation.
- the first vanadium ion solution prepared as described above may be a tetravalent to 4.5 valent vanadium ion solution.
- the 'tetravalent to 4.5-valent vanadium ion solution' means a range encompassing the intermediate oxidation number of the oxidation number. That is, not only tetravalent and 4.5 valence, but also 4.1 valence and 4.2 valence. More specifically, the first vanadium ion solution may be a tetravalent vanadium ion solution.
- the prepared first vanadium ion solution may be prepared and stored in the reaction tank 110 .
- the first vanadium ion solution stored in the reaction tank 100 is the first stack 140 including the positive electrode 141, the separator 143, and the negative electrode 142 connected thereafter by a transfer device including a pump. 1 is introduced into the positive electrolyte tank 120 and the first negative electrolyte tank 130 .
- the first anode electrolyte tank 120 stores the first vanadium ion solution as an anode electrolyte
- the first cathode electrolyte tank 130 stores the first vanadium ion solution as a cathode electrolyte.
- the first vanadium ion solution stored in each of the first electrolyte tanks 120 and 130 is a first stack including an anode 141, a separator 143, and a cathode 142 by a transfer device including a valve and a pump At 140, the anode 141 and the cathode 142 are respectively introduced.
- the separator 143 serves to transfer hydrogen ions and block the movement of vanadium ions from the positive electrode 141 and the negative electrode 142 to the opposite electrode. As the separator 143 performing the above role, it is preferable to use an ion conductive separator.
- an electrolytic reaction according to the flow of electricity occurs. That is, in the anode 141 , vanadium in the first vanadium ion solution is oxidized to generate a second vanadium ion solution, and in the cathode 142 , vanadium in the first vanadium ion solution is reduced to generate a third vanadium ion solution. do. More specifically, when the first vanadium ion solution is introduced into the first stack 141 and then charging is performed, an oxidation/reduction reaction in which vanadium loses electrons at the anode and gains electrons at the cathode proceeds.
- the second vanadium ion solution may be a pentavalent vanadium ion solution
- the third vanadium ion solution may be a trivalent to 3.5 valent vanadium ion solution.
- the 'trivalent to 3.5-valent vanadium ion solution' refers to a range encompassing the intermediate oxidation number of the oxidation number. That is, not only trivalence and 3.5 valence, but also 3.1 valence and 3.2 valence.
- the third vanadium ion solution may be a trivalent vanadium ion solution.
- the second vanadium ion solution which is a pentavalent vanadium ion solution generated in the anode 141 , is substantially an excess vanadium ion solution, and in the prior art, there was no choice but to waste the electrolyte as much as the excess pentavalent vanadium ion solution. Accordingly, there was a problem in that the manufacturing cost of the electrolyte is increased.
- the second vanadium ion solution generated in the positive electrode 141 reacts with a reducing agent to be reduced to a fourth vanadium ion solution.
- the reduction reactor 150 and the reaction tank 110 for preparing and storing the first vanadium ion solution are illustrated as separate components, they may have the same configuration. That is, the reaction tank 110 may be used as the reduction reactor 150 .
- the reducing agent may be introduced by the reducing agent input unit 151 to reduce the second vanadium ion solution to the fourth vanadium ion solution.
- the fourth vanadium ion solution may be a tetravalent to 4.5 valent vanadium ion solution.
- the 'tetravalent to 4.5-valent vanadium ion solution' means a range encompassing the intermediate oxidation number of the oxidation number. That is, not only tetravalent and 4.5 valence, but also 4.1 valence and 4.2 valence.
- the reducing agent may be at least one selected from the group consisting of oxalic acid, hydrazine monohydrate, ethanol, methanol and formic acid, and specifically, oxalic acid.
- the reducing agent may be added in an amount corresponding to the molar ratio by measuring the concentration of pentavalent vanadium ions in the second vanadium ion solution. That is, the reducing agent may be input as many as the number of moles of pentavalent vanadium ions. Accordingly, more specifically, the fourth vanadium ion solution may be a tetravalent vanadium ion solution.
- a reducing agent is added less than the number of moles of pentavalent vanadium ions, a large amount of pentavalent vanadium ions remain, which reduces the reuse rate of the electrolyte and reduces the capacity, resulting in a decrease in efficiency. If too much is included, the remaining reducing agent lowers the purity of the fourth vanadium ion solution, and then, when it is reused again, it reacts with pentavalent vanadium ions to cause side reactions inside the stack, thereby reducing the stack performance and lifespan. it is not preferable to have
- the reducing agent may be inputted according to the concentration of the pentavalent vanadium ion in the second vanadium ion solution by the reducing agent input unit 151 .
- the molar ratio of pentavalent vanadium ions to oxalic acid in the second vanadium ion solution may be 1:1.
- this reduction may be performed until the concentration of pentavalent vanadium ions in the reduction reactor becomes 0.01M or less, and the temperature of the reduction reaction is in the range of 50°C to 100°C for 1 hour to 6 hours. and, specifically, it may be carried out in the range of 50° C. to 70° C. for 1 hour to 3 hours.
- the reduction reaction temperature or time is not limited as long as the reduction reaction is carried out until the concentration of pentavalent vanadium ions becomes 0.01M or less, but when considering side reactions or efficiency of production time, it is within the above range It is more preferably carried out in
- the reduction reaction is inert It can be carried out in the presence of gas.
- the inert gas may be supplied until all of the reduction reaction is performed.
- the inert gas may be supplied until the concentration of pentavalent vanadium ions becomes 0.01M or less.
- the inert gas is not limited, but may be at least one selected from the group consisting of nitrogen, argon, and helium, and specifically, nitrogen or argon, and more specifically nitrogen.
- a gas such as CO 2 present in the fourth vanadium ion solution from the supply of the inert gas may be removed through the gas discharge unit 153 .
- the prepared fourth vanadium ion solution is a second stack 180 including an anode 181 , a separator 183 , and a cathode 182 connected by a transfer device including a pump. It can be reused by flowing into the anode electrolyte tank 160 and the second cathode electrolyte tank 170 .
- 130 is shown as a separate configuration, it may be the same configuration. If the configuration is the same, when the fourth vanadium ion solution is supplied from the reduction reactor 150, the trivalent to 3.5-valent vanadium ion solution delivered from the cathode in the previous reaction and stored in the cathode electrolyte tank 130 is in the first stack. may have been removed.
- the fourth vanadium ion solution introduced into the second anode electrolyte tank 150 and the second cathode electrolyte tank 170 may be reused by repeating the process of steps (a) to (d) again.
- the electrolyte can be continuously manufactured without wasting the vanadium ion solution, thereby lowering the manufacturing cost and increasing the efficiency.
- the electrolyte can be prepared without by-products by easily adjusting the amount of the reducing agent input and effectively removing the gas generated according to the reduction.
- the first vanadium ion solution prepared in Preparation Example was injected into each of the positive electrolyte tank and the negative electrolyte tank connected to the stack including the positive electrode, the separator, and the negative electrode, and the charging step was carried out at a current density of 50 mA/cm 2 to SOC 50. .
- the molar concentration of pentavalent vanadium ions was measured by transferring the second vanadium ion solution generated from the positive electrode to the reduction reactor.
- Oxalic acid was used as a reducing agent, and the oxalic acid was introduced into the reduction reactor so that the molar ratio of pentavalent vanadium ions to the reducing agent oxalic acid was 1:1, and then the reduction reaction was carried out at 65 to 70° C. for 2 hours.
- nitrogen gas is supplied through a nitrogen gas supply device connected to the reduction reactor until the concentration of pentavalent vanadium ions in the reduction reactor becomes 0.01M or less. supplied.
- V 4+ vanadium ion solution A fourth vanadium ion solution (V 4+ vanadium ion solution) in which the reduction reaction was completed was obtained.
- a fourth vanadium ion solution in which the reduction reaction was completed was injected into each of the positive electrolyte tank and the negative electrolyte tank connected to the stack including the positive electrode, the separator, and the negative electrode, and the charging step was carried out at a current density of 50 mA/cm 2 to SOC 50, and the negative electrode to obtain a vanadium ion solution produced in
- Example 1 after the first charging was completed, a vanadium ion solution generated in the negative electrode was prepared.
- a fourth vanadium ion solution was obtained from the reduction reactor in the same manner as in Example 1, except that nitrogen gas was not supplied during the reduction reaction, and an anode electrolyte tank connected to a stack including an anode, a separator, and a cathode;
- the fourth vanadium ion solution was injected into each of the anode electrolyte tanks, and the charging step was performed up to SOC 50 at a current density of 50 mA/cm 2 to obtain a vanadium ion solution generated in the anode.
- Example 1 To check the performance of the vanadium ion solution prepared in Example 1 and Comparative Example 1, put it in the cell of the following configuration, and the characteristic efficiency (energy, voltage, current) in the 100th cycle of the vanadium redox flow battery containing the prepared electrolyte efficiency), and the results are shown in Table 1 below.
- Electrode SGL (GFD 3)
- Example 1 Comparative Example 1 Energy Efficiency (%) 86.3 86.3 Voltage Efficiency (%) 89.4 89.4 Current Efficiency (%) 96.6 96.5
- the results show the average efficiency after 100 cycles of driving the vanadium redox flow battery, and even when a vanadium flow battery is manufactured using the electrolyte solution of the re-reduced tetravalent vanadium ion solution as in Example 1, the novel It can be confirmed that the cell performance is the same as that of Comparative Example 1 using the tetravalent vanadium ion solution electrolyte, and it can be confirmed that the efficiency or performance of the battery is not significantly deteriorated even in a long-term driving cycle.
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Abstract
Description
실시예 1 | 비교예 1 | |
에너지 효율(%) | 86.3 | 86.3 |
전압 효율(%) | 89.4 | 89.4 |
전류 효율(%) | 96.6 | 96.5 |
Claims (7)
- (a) 제1 바나듐 이온 용액을 제조하는 단계;(b) 상기 제1 바나듐 이온 용액이 양극, 분리막, 음극을 포함하는 제1 스택이 연결된 제1 양극 전해액 탱크 및 제1 음극 전해액 탱크로 유입되는 단계;(c) 상기 제1 양극 전해액 탱크로부터 제1 바나듐 이온 용액이 양극으로 유입된 후 산화되어 제2 바나듐 이온 용액이 생성되고, 상기 제1 음극 전해액 탱크로부터 제1 바나듐 이온 용액이 음극으로 유입된 후 환원되어 제3 바나듐 이온 용액이 생성되는 단계;(d) 상기 양극에서 발생한 제2 바나듐 이온 용액이 환원제와 반응하여, 제4 바나듐 이온 용액으로 환원되는 단계;를 포함하는 바나듐 레독스 흐름 전지용 전해액의 제조방법.
- 청구항 1에 있어서,(e) 상기 제4 바나듐 이온 용액이 양극, 분리막, 음극을 포함하는 제2 스택이 연결된 제2 양극 전해액 탱크 및 제2 음극 전해액 탱크로 유입되어 재사용되는 단계;를 더 포함하는 바나듐 레독스 흐름 전지용 전해액의 제조방법.
- 청구항 2에 있어서,상기 단계 (e)의 환원제는 제2 바나듐 이온 용액 내의 5가 바나듐 이온의 농도를 측정하여 그 몰비에 대응되는 양으로 투입되는 바나듐 레독스 흐름 전지용 전해액의 제조방법.
- 청구항 1에 있어서,상기 단계 (d)의 환원제는, 옥살산, 히드라진모노하이드레이트, 에탄올, 메탄올 및 포름산으로 이루어진 군에서 선택되는 1종 이상인 바나듐 레독스 흐름 전지용 전해액의 제조방법.
- 청구항 1에 있어서,상기 단계 (d)의 환원은 제2 바나듐 이온 용액 내의 5가 바나듐 이온의 농도가 0.01M 이하가 될 때까지 수행되는 바나듐 레독스 흐름 전지용 전해액의 제조방법.
- 청구항 1에 있어서,상기 단계 (d)의 환원 반응은, 불활성 가스 존재 하에서 수행되는 단계를 더 포함하는 바나듐 레독스 흐름 전지용 전해액의 제조방법.
- 청구항 5에 있어서,상기 불활성 가스는 질소, 아르곤, 및 헬륨으로 이루어진 군에서 선택되는 1종 이상인 바나듐 레독스 흐름 전지용 전해액의 제조방법.
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US18/255,019 US20240030462A1 (en) | 2020-11-30 | 2021-11-30 | Method for producing electrolyte for vanadium redox flow battery |
AU2021385919A AU2021385919A1 (en) | 2020-11-30 | 2021-11-30 | Method for producing electrolyte for vanadium redox flow battery |
CN202180086999.4A CN116711113A (zh) | 2020-11-30 | 2021-11-30 | 钒氧化还原液流电池用电解液的制备方法 |
EP21898751.9A EP4254572A1 (en) | 2020-11-30 | 2021-11-30 | Method for producing electrolyte for vanadium redox flow battery |
JP2023532544A JP2023552157A (ja) | 2020-11-30 | 2021-11-30 | バナジウムレドックスフロー電池用電解液の製造方法 |
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- 2021-11-30 WO PCT/KR2021/017901 patent/WO2022114926A1/ko active Application Filing
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CN116711113A (zh) | 2023-09-05 |
JP2023552157A (ja) | 2023-12-14 |
EP4254572A1 (en) | 2023-10-04 |
AU2021385919A1 (en) | 2023-06-22 |
US20240030462A1 (en) | 2024-01-25 |
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