CN109742432A - A kind of electrolyte and preparation method thereof for vanadium cell - Google Patents
A kind of electrolyte and preparation method thereof for vanadium cell Download PDFInfo
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- CN109742432A CN109742432A CN201811594972.2A CN201811594972A CN109742432A CN 109742432 A CN109742432 A CN 109742432A CN 201811594972 A CN201811594972 A CN 201811594972A CN 109742432 A CN109742432 A CN 109742432A
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Abstract
The electrolyte and preparation method thereof that the present invention relates to a kind of for vanadium cell.Its technical solution is: by solid-to-liquid ratio be (225~1125) by vanadic anhydride and deionized water: 1g/L is mixed, and obtains mixture slurry；By supporting electrolyte: the molar ratio of vanadic anhydride is (3~7): 1, supporting electrolyte is added to mixture slurry, stirring obtains activation slurry；By reducing agent: the molar ratio of vanadic anhydride is (0.9~1.2): 1, reducing agent is added in activation slurry, is stirred, filtering obtains electrolyte crude liquid；Electrolyte crude liquid is placed in electrolytic cell cathode, electrolytic cell anode is added in sulfuric acid solution identical with electrolyte crude liquid acidity；Then by electrolyte crude liquid, constant-current electrolysis to electrolyte valence state is 3.5 to get the electrolyte for being used for vanadium cell under the conditions of electric current is 1~5A.High production efficiency of the invention and low energy consumption, the prepared electrolyte for vanadium cell chemical property with good stability and excellent in wide temperature range.
Description
Technical field
The invention belongs to electrolyte preparation technical fields.More particularly to a kind of for the electrolyte of vanadium cell and its preparation side
Method.
Background technique
The electrolyte component part important as vanadium cell, not only determines the cost of vanadium energy storage system, also determines
Its energy density and system effectiveness.To guarantee vanadium cell energy density with higher and efficiency, electrolyte must have compared with
Good width temperature range stability under high concentration and high concentration, while electrolyte must have good chemical property.
For vanadium cell electrolyte due to the low-temperature stability of its pentavalent thermal stability and divalent, trivalent and tetravalence it is very poor, greatly
Limit the energy density and use temperature range of vanadium cell.Currently, for vanadium cell electrolyte in vanadium concentration be 1.2~
1.6mol/L, energy density are only 18~20Wh/L, and Applicable temperature section is 0~40 DEG C.Further, since the raising meeting of vanadium concentration
Lead to electrolyte electrochemical penalty, is unfavorable for improving the system effectiveness of vanadium cell.Therefore, electrolyte vanadium concentration and height are improved
The wide temperature range stability of electrolyte of vanadium redox battery and chemical property become urgent problem to be solved under concentration.
A kind of " preparation method of all vanadium ion redox flow battery electrolyte " (CN100466349C) patented technology,
Propose a kind of preparation method of electrolyte of vanadium redox battery, using vanadic sulfate as raw material, by be added after ultrasonic wave hydrotropy it is inorganic-have
The electrolyte of 5-6mol/L is made in machine compound additive, though the stability of electrolyte of vanadium redox battery can be improved in the addition of additive,
When electrolyte be in wider temperature range still will appear wild effect and electrolyte chemical property occur it is bright
Aobvious decline.
" a kind of electrolyte for vanadium cell and preparation method thereof " (CN108206295A) patented technology proposes a kind of novel
The preparation method of electrolyte methane sulfonic acid is added in the tetravalence and trivalent vanadium ion electrolyte that electrolysis obtains, to improve electrolysis
The electro-chemical activity and invertibity of liquid, but the wide temperature range stability of high concentration electrolyte is not effectively improved.
A kind of " all-vanadium redox flow battery electrolytic solution preparation method " (CN105006585B) patented technology proposes
The concentration and stability of electrolyte are improved by the way of stabilizer ethylene glycol or tetraacethyl diaminoethanes is added, but are electrolysed
The equilibrium temperature range of liquid is not widened and the chemical property of electrolyte is not improved.
" a kind of low temperature all-vanadium redox flow battery electrolyte and preparation method thereof " (CN108199068A) patented technology, will be sub-
Phosphoric acid, the additive containing lead ion, ammonium ion, lithium ion are added in electrolyte, and electrolyte is made to have good low temperature
Unstability, while electrolyte liberation of hydrogen oxygen evolution potential, low-temperature conductive performance can be improved, be conducive to the guarantor of long-term circulation volume
It holds.Allow vanadium cell stable operation in low temperature environment.Although the cryogenic property of electrolyte is effectively improved, electrolysis
Performance does not get a promotion liquid in a high temperauture environment.
In conclusion with good stability and chemical property high concentration electrolyte is prepared at present, it is general to use
The mode of additive is added, but presence can not improve high concentration electrolyte in wide temperature range stability and electrochemistry simultaneously
The problem of energy, it is unfavorable for application of the high-energy density electrolyte in wide temperature range.
Summary of the invention
The present invention is directed to overcome the deficiencies of existing technologies, it is therefore intended that propose that a kind of high production efficiency is used for what low energy consumption
The preparation method of electrolyte of vanadium cell；Electrolyte vanadium concentration height, the chemical property for vanadium cell prepared with this method is excellent
Different and wide temperature range has good stability.
To achieve the above object, the technical solution adopted by the present invention comprises the concrete steps that:
Step 1: being (225~1125): 1g/L by vanadic anhydride and deionized water solid-to-liquid ratio, by five oxidation two
Vanadium is mixed with the deionized water, obtains mixture slurry.
Step 2: pressing supporting electrolyte: the molar ratio of the vanadic anhydride is (3~7): in 1, Xiang Suoshu mixture slurry
The supporting electrolyte is added, stirs, obtains activation slurry.
Step 3: pressing reducing agent: the molar ratio of the vanadic anhydride is (0.9~1.2): 1, the reducing agent is added
In the activation slurry, 2~8h is stirred under the conditions of 40~90 DEG C, filtering obtains electrolyte crude liquid.
Step 4: the electrolyte crude liquid is placed in electrolytic cell cathode, electrolytic cell anode, the sulphur is added in sulfuric acid solution
The acidity of acid solution is identical as the acidity of the electrolyte crude liquid；Again by the electrolyte crude liquid under the conditions of electric current is 1~5A
Constant-current electrolysis to electrolyte valence state is 3.5 to get the electrolyte for vanadium cell.
Purity >=99.5% of the vanadic anhydride.
The supporting electrolyte be hydrofluoric acid or be hydrofluoric acid and sulfuric acid mixed acid；In the mixed acid, hydrofluoric acid: sulphur
The molar ratio of acid is (2~4): 1.
The reducing agent is one or more of oxalic acid, sulfur dioxide, glucose, tartaric acid, formic acid and acetic acid.
Due to using the above method, the present invention has the positive effect that compared with prior art:
1, it is prepared by way of being electrolysed again to vanadic anhydride elder generation activating and reducing for vanadium cell due to the present invention
Electrolyte, the electrolyte for vanadium cell of high concentration can not only be prepared at a lower temperature, moreover it is possible to avoid due to use
Electrolysis vanadic anhydride efficiency is too low and the excessively high problem of cost of electrolyte is prepared using vanadic sulfate.
2, due to the mixed acid that supporting electrolyte of the present invention is hydrofluoric acid or hydrofluoric acid and sulfuric acid, a large amount of fluorine from
The introducing of son and the stronger complexing power itself having can be formed with the vanadium ion in electrolyte and more closely be combined,
To significantly improve the height temperature stability and chemical property of the electrolyte for vanadium cell.
Therefore, the present invention has the characteristics that high production efficiency and low energy consumption；The electricity for vanadium cell prepared with this method
Solve liquid chemical property with good stability and excellent in wide temperature range.
Detailed description of the invention
Fig. 1 be a kind of electrolyte for vanadium cell prepared by the present invention in wide temperature range under different current densities
Energy efficiency figure；
Fig. 2 is the cyclic voltammetry curve figure shown in Fig. 1 for the electrolyte of vanadium cell.
Specific embodiment
The present invention will be further described With reference to embodiment, not to the limitation of its protection scope:
In present embodiment: purity >=99.5% of the vanadic anhydride.It is repeated no more in embodiment.
Embodiment 1
A kind of electrolyte and preparation method thereof for vanadium cell.The preparation method comprises the concrete steps that:
Step 1: being (225~325): 1g/L by vanadic anhydride and deionized water solid-to-liquid ratio, by the vanadic anhydride
It is mixed with the deionized water, obtains mixture slurry.
Step 2: pressing supporting electrolyte: the molar ratio of the vanadic anhydride is (3~3.5): 1, Xiang Suoshu mixture slurry
Interior that the supporting electrolyte is added, stirring obtains activation slurry.
Step 3: pressing reducing agent: the molar ratio of the vanadic anhydride is (0.9~1.0): 1, the reducing agent is added
In the activation slurry, 2~3h is stirred under the conditions of 40~50 DEG C, filtering obtains electrolyte crude liquid.
Step 4: the electrolyte crude liquid is placed in electrolytic cell cathode, electrolytic cell anode, the sulphur is added in sulfuric acid solution
The acidity of acid solution is identical as the acidity of the electrolyte crude liquid；Again by the electrolyte crude liquid under the conditions of electric current is 1~3A
Constant-current electrolysis to electrolyte valence state is 3.5 to get the electrolyte for vanadium cell.
The supporting electrolyte is hydrofluoric acid.
The reducing agent is oxalic acid.
The vanadium concentration of electrolyte manufactured in the present embodiment for vanadium cell is 1.6~1.9mol/L, at -10-50 DEG C
It can be stabilized 10 days or more in temperature range；The electrolyte has good chemical property.
Embodiment 2
A kind of electrolyte and preparation method thereof for vanadium cell.The preparation method comprises the concrete steps that:
Step 1: being (325~425): 1g/L by vanadic anhydride and deionized water solid-to-liquid ratio, by the vanadic anhydride
It is mixed with the deionized water, obtains mixture slurry.
Step 2: pressing supporting electrolyte: the molar ratio of the vanadic anhydride is (3.5~4): 1, Xiang Suoshu mixture slurry
Interior that the supporting electrolyte is added, stirring obtains activation slurry.
Step 3: pressing reducing agent: the molar ratio of the vanadic anhydride is (1.0~1.1): 1, the reducing agent is added
In the activation slurry, 3~4h is stirred under the conditions of 50~60 DEG C, filtering obtains electrolyte crude liquid.
Step 4: the electrolyte crude liquid is placed in electrolytic cell cathode, electrolytic cell anode, the sulphur is added in sulfuric acid solution
The acidity of acid solution is identical as the acidity of the electrolyte crude liquid；Again by the electrolyte crude liquid under the conditions of electric current is 2~4A
Constant-current electrolysis to electrolyte valence state is 3.5 to get the electrolyte for vanadium cell.
The supporting electrolyte is hydrofluoric acid.
The reducing agent is sulfur dioxide.
The vanadium concentration of electrolyte manufactured in the present embodiment for vanadium cell is 1.9~2.2mol/L, at -10-40 DEG C
It can be stabilized 10 days or more in temperature range；The electrolyte has good chemical property.
Embodiment 3
A kind of electrolyte and preparation method thereof for vanadium cell.The preparation method comprises the concrete steps that:
Step 1: being (425~525): 1g/L by vanadic anhydride and deionized water solid-to-liquid ratio, by the vanadic anhydride
It is mixed with the deionized water, obtains mixture slurry.
Step 2: pressing supporting electrolyte: the molar ratio of the vanadic anhydride is (4~4.5): 1, Xiang Suoshu mixture slurry
Interior that the supporting electrolyte is added, stirring obtains activation slurry.
Step 3: pressing reducing agent: the molar ratio of the vanadic anhydride is (1.1~1.2): 1, the reducing agent is added
In the activation slurry, 4~5h is stirred under the conditions of 60~70 DEG C, filtering obtains electrolyte crude liquid.
Step 4: the electrolyte crude liquid is placed in electrolytic cell cathode, electrolytic cell anode, the sulphur is added in sulfuric acid solution
The acidity of acid solution is identical as the acidity of the electrolyte crude liquid；Again by the electrolyte crude liquid under the conditions of electric current is 3~5A
Constant-current electrolysis to electrolyte valence state is 3.5 to get the electrolyte for vanadium cell.
The supporting electrolyte is the mixed acid of hydrofluoric acid and sulfuric acid；In the mixed acid, hydrofluoric acid: the molar ratio of sulfuric acid
For (2~2.5): 1.
The reducing agent is glucose.
The vanadium concentration of electrolyte manufactured in the present embodiment for vanadium cell is 2.2~2.5mol/L, at -10-45 DEG C
It can be stabilized 10 days or more in temperature range；The electrolyte has good chemical property.
Embodiment 4
A kind of electrolyte and preparation method thereof for vanadium cell.The preparation method comprises the concrete steps that:
Step 1: being (525~625): 1g/L by vanadic anhydride and deionized water solid-to-liquid ratio, by the vanadic anhydride
It is mixed with the deionized water, obtains mixture slurry.
Step 2: pressing supporting electrolyte: the molar ratio of the vanadic anhydride is (4.5~5): 1, Xiang Suoshu mixture slurry
Interior that the supporting electrolyte is added, stirring obtains activation slurry.
Step 3: pressing reducing agent: the molar ratio of the vanadic anhydride is (0.9~1.0): 1, the reducing agent is added
In the activation slurry, 5~6h is stirred under the conditions of 70~80 DEG C, filtering obtains electrolyte crude liquid.
Step 4: the electrolyte crude liquid is placed in electrolytic cell cathode, electrolytic cell anode, the sulphur is added in sulfuric acid solution
The acidity of acid solution is identical as the acidity of the electrolyte crude liquid；Again by the electrolyte crude liquid under the conditions of electric current is 3~5A
Constant-current electrolysis to electrolyte valence state is 3.5 to get the electrolyte for vanadium cell.
The supporting electrolyte is the mixed acid of hydrofluoric acid and sulfuric acid；In the mixed acid, hydrofluoric acid: the molar ratio of sulfuric acid
For (2.5~3): 1.
The reducing agent is tartaric acid.
The vanadium concentration of electrolyte manufactured in the present embodiment for vanadium cell is 2.5~2.8mol/L, at -10-40 DEG C
It can be stabilized 10 days or more in temperature range；The electrolyte has good chemical property.
Embodiment 5
A kind of electrolyte and preparation method thereof for vanadium cell.The preparation method comprises the concrete steps that:
Step 1: being (625~725): 1g/L by vanadic anhydride and deionized water solid-to-liquid ratio, by the vanadic anhydride
It is mixed with the deionized water, obtains mixture slurry.
Step 2: pressing supporting electrolyte: the molar ratio of the vanadic anhydride is (5~5.5): 1, Xiang Suoshu mixture slurry
Interior that the supporting electrolyte is added, stirring obtains activation slurry.
Step 3: pressing reducing agent: the molar ratio of the vanadic anhydride is (1.0~1.1): 1, the reducing agent is added
In the activation slurry, 6~7h is stirred under the conditions of 80~90 DEG C, filtering obtains electrolyte crude liquid.
Step 4: the electrolyte crude liquid is placed in electrolytic cell cathode, electrolytic cell anode, the sulphur is added in sulfuric acid solution
The acidity of acid solution is identical as the acidity of the electrolyte crude liquid；Again by the electrolyte crude liquid under the conditions of electric current is 2~4A
Constant-current electrolysis to electrolyte valence state is 3.5 to get the electrolyte for vanadium cell.
The supporting electrolyte is the mixed acid of hydrofluoric acid and sulfuric acid；In the mixed acid, hydrofluoric acid: the molar ratio of sulfuric acid
For (3~3.5): 1.
The reducing agent is formic acid.
The vanadium concentration of electrolyte manufactured in the present embodiment for vanadium cell is 2.8~3.1mol/L, at -10-45 DEG C
It can be stabilized 10 days or more in temperature range；The electrolyte has good chemical property.
Embodiment 6
A kind of electrolyte and preparation method thereof for vanadium cell.The preparation method comprises the concrete steps that:
Step 1: being (725~825): 1g/L by vanadic anhydride and deionized water solid-to-liquid ratio, by the vanadic anhydride
It is mixed with the deionized water, obtains mixture slurry.
Step 2: pressing supporting electrolyte: the molar ratio of the vanadic anhydride is (5.5~6): 1, Xiang Suoshu mixture slurry
Interior that the supporting electrolyte is added, stirring obtains activation slurry.
Step 3: pressing reducing agent: the molar ratio of the vanadic anhydride is (1.1~1.2): 1, the reducing agent is added
In the activation slurry, 7~8h is stirred under the conditions of 45~55 DEG C, filtering obtains electrolyte crude liquid.
Step 4: the electrolyte crude liquid is placed in electrolytic cell cathode, electrolytic cell anode, the sulphur is added in sulfuric acid solution
The acidity of acid solution is identical as the acidity of the electrolyte crude liquid；Again by the electrolyte crude liquid under the conditions of electric current is 1~3A
Constant-current electrolysis to electrolyte valence state is 3.5 to get the electrolyte for vanadium cell.
The supporting electrolyte is hydrofluoric acid.
The reducing agent is acetic acid.
The vanadium concentration of electrolyte manufactured in the present embodiment for vanadium cell is 3.1~3.4mol/L, at -10-40 DEG C
It can be stabilized 10 days or more in temperature range；The electrolyte has good chemical property.
Embodiment 7
A kind of electrolyte and preparation method thereof for vanadium cell.The preparation method comprises the concrete steps that:
Step 1: being (825~925): 1g/L by vanadic anhydride and deionized water solid-to-liquid ratio, by the vanadic anhydride
It is mixed with the deionized water, obtains mixture slurry.
Step 2: pressing supporting electrolyte: the molar ratio of the vanadic anhydride is (6~6.5): 1, Xiang Suoshu mixture slurry
Interior that the supporting electrolyte is added, stirring obtains activation slurry.
Step 3: pressing reducing agent: the molar ratio of the vanadic anhydride is (0.9~1.0): 1, the reducing agent is added
In the activation slurry, 3~4h is stirred under the conditions of 55~65 DEG C, filtering obtains electrolyte crude liquid.
Step 4: the electrolyte crude liquid is placed in electrolytic cell cathode, electrolytic cell anode, the sulphur is added in sulfuric acid solution
The acidity of acid solution is identical as the acidity of the electrolyte crude liquid；Again by the electrolyte crude liquid under the conditions of electric current is 2~4A
Constant-current electrolysis to electrolyte valence state is 3.5 to get the electrolyte for vanadium cell.
Purity >=99.5% of the vanadic anhydride.
The supporting electrolyte is the mixed acid of hydrofluoric acid and sulfuric acid；In the mixed acid, hydrofluoric acid: the molar ratio of sulfuric acid
For (3.5~4): 1.
The reducing agent is the mixing of two kinds of substances in oxalic acid, sulfur dioxide, glucose, tartaric acid, formic acid and acetic acid
Object.
The vanadium concentration of electrolyte manufactured in the present embodiment for vanadium cell is 3.4~3.7mol/L, at -10-35 DEG C
It can be stabilized 10 days or more in temperature range；The electrolyte has good chemical property.
Embodiment 8
A kind of electrolyte and preparation method thereof for vanadium cell.The present embodiment the method comprises the concrete steps that:
Step 1: being (925~1025): 1g/L by vanadic anhydride and deionized water solid-to-liquid ratio, by five oxidation two
Vanadium is mixed with the deionized water, obtains mixture slurry.
Step 2: pressing supporting electrolyte: the molar ratio of the vanadic anhydride is (6.5~7): 1, Xiang Suoshu mixture slurry
Interior that the supporting electrolyte is added, stirring obtains activation slurry.
Step 3: pressing reducing agent: the molar ratio of the vanadic anhydride is (1.0~1.1): 1, the reducing agent is added
In the activation slurry, 4~5h is stirred under the conditions of 65~75 DEG C, filtering obtains electrolyte crude liquid.
Step 4: the electrolyte crude liquid is placed in electrolytic cell cathode, electrolytic cell anode, the sulphur is added in sulfuric acid solution
The acidity of acid solution is identical as the acidity of the electrolyte crude liquid；Again by the electrolyte crude liquid under the conditions of electric current is 3~5A
Constant-current electrolysis to electrolyte valence state is 3.5 to get the electrolyte for vanadium cell.
The supporting electrolyte is the mixed acid of hydrofluoric acid and sulfuric acid；In the mixed acid, hydrofluoric acid: the molar ratio of sulfuric acid
For (2~2.5): 1.
The reducing agent is the mixing of three kinds of substances in oxalic acid, sulfur dioxide, glucose, tartaric acid, formic acid and acetic acid
Object.
The vanadium concentration of electrolyte manufactured in the present embodiment for vanadium cell is 3.7~4.0mol/L, at -10-35 DEG C
It can be stabilized 10 days or more in temperature range；The electrolyte has good chemical property.
Embodiment 9
A kind of electrolyte and preparation method thereof for vanadium cell.The preparation method comprises the concrete steps that:
Step 1: being (1025~1125): 1g/L by vanadic anhydride and deionized water solid-to-liquid ratio, by five oxidation two
Vanadium is mixed with the deionized water, obtains mixture slurry.
Step 2: pressing supporting electrolyte: the molar ratio of the vanadic anhydride is (6.0~6.5): 1, Xiang Suoshu mixing slurry
The supporting electrolyte is added in vivo, stirs, obtains activation slurry.
Step 3: pressing reducing agent: the molar ratio of the vanadic anhydride is (1.1~1.2): 1, the reducing agent is added
In the activation slurry, 6~7h is stirred under the conditions of 75~85 DEG C, filtering obtains electrolyte crude liquid.
Step 4: the electrolyte crude liquid is placed in electrolytic cell cathode, electrolytic cell anode, the sulphur is added in sulfuric acid solution
The acidity of acid solution is identical as the acidity of the electrolyte crude liquid；Again by the electrolyte crude liquid under the conditions of electric current is 4~5A
Constant-current electrolysis to electrolyte valence state is 3.5 to get the electrolyte for vanadium cell.
Purity >=99.5% of the vanadic anhydride.
The supporting electrolyte is the mixed acid of hydrofluoric acid and sulfuric acid；In the mixed acid, hydrofluoric acid: the molar ratio of sulfuric acid
For (2.5~3): 1.
The reducing agent is four kinds or more of substance in oxalic acid, sulfur dioxide, glucose, tartaric acid, formic acid and acetic acid
Mixture.
The vanadium concentration of electrolyte manufactured in the present embodiment for vanadium cell is 4.0~4.3mol/L, at -10-35 DEG C
10 days electrolyte described above can be stabilized in temperature range has good chemical property.
The present invention has the positive effect that compared with prior art:
1, it is prepared by way of being electrolysed again to vanadic anhydride elder generation activating and reducing for vanadium cell due to the present invention
Electrolyte, the electrolyte for vanadium cell of high concentration can not only be prepared at a lower temperature, moreover it is possible to avoid due to use
Electrolysis vanadic anhydride efficiency is too low and the excessively high problem of cost of electrolyte is prepared using vanadic sulfate.
2, due to the mixed acid that supporting electrolyte of the present invention is hydrofluoric acid or hydrofluoric acid and sulfuric acid, a large amount of fluorine from
The introducing of son and the stronger complexing power itself having can be formed with the vanadium ion in electrolyte and more closely be combined,
To significantly improve the height temperature stability and chemical property of the electrolyte for vanadium cell.
3, the chemical property of the electrolyte prepared by the present invention for vanadium cell is as shown in the picture, and Fig. 1 is that embodiment 1 is made
A kind of energy efficiency figure of the standby electrolyte of vanadium redox battery in wide temperature range under different current densities；Fig. 2 is preparation of the present invention
Electrolyte of vanadium redox battery cyclic voltammetry curve figure.As can be seen from Figure 1: prepared electrolyte of vanadium redox battery is in wide temperature range
With good battery charge and discharge performance；As can be seen from Figure 2: prepared electrolyte of vanadium redox battery is living with good electrochemistry
Property and invertibity.
Therefore, the present invention has the characteristics that high production efficiency and low energy consumption；The electricity for vanadium cell prepared with this method
Solve liquid chemical property with good stability and excellent in wide temperature range.
Claims (4)
1. a kind of preparation method of the electrolyte for vanadium cell, it is characterised in that the preparation method comprises the concrete steps that:
Step 1: be (225~1125): 1g/L by vanadic anhydride and deionized water solid-to-liquid ratio, by the vanadic anhydride with
The deionized water mixing, obtains mixture slurry；
Step 2: pressing supporting electrolyte: the molar ratio of the vanadic anhydride is (3~7): being added in 1, Xiang Suoshu mixture slurry
The supporting electrolyte, stirring obtain activation slurry；
Step 3: pressing reducing agent: the molar ratio of the vanadic anhydride is (0.9~1.2): 1, it will be described in reducing agent addition
It activates in slurry, 2~8h is stirred under the conditions of 40~90 DEG C, filtering obtains electrolyte crude liquid；
Step 4: the electrolyte crude liquid is placed in electrolytic cell cathode, electrolytic cell anode is added in sulfuric acid solution, the sulfuric acid is molten
The acidity of liquid is identical as the acidity of the electrolyte crude liquid；Again by electrolyte crude liquid constant current under the conditions of electric current is 1~5A
Electrolysis to electrolyte valence state is 3.5 to get the electrolyte for vanadium cell；
Purity >=99.5% of the vanadic anhydride.
2. the preparation method of the electrolyte according to claim 1 for vanadium cell, it is characterised in that the support electrolysis
Matter be hydrofluoric acid or be hydrofluoric acid and sulfuric acid mixed acid；In the mixed acid, hydrofluoric acid: the molar ratio of sulfuric acid is (2~4):
1。
3. the preparation method of the electrolyte according to claim 1 for vanadium cell, it is characterised in that the reducing agent is
One or more of oxalic acid, sulfur dioxide, glucose, tartaric acid, formic acid and acetic acid.
4. a kind of electrolyte for vanadium cell, it is characterised in that the electrolyte for vanadium cell is according to claim 1
The electrolyte of vanadium cell is used for prepared by preparation method described in any one of~3 for the electrolyte of vanadium cell.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111342102A (en) * | 2020-04-03 | 2020-06-26 | 武汉科技大学 | Preparation method of vanadium battery electrolyte based on vanadium compound |
| CN111446478A (en) * | 2020-04-03 | 2020-07-24 | 武汉科技大学 | Method for preparing vanadium battery electrolyte by taking vanadium-rich liquid as raw material |
| CN111477925A (en) * | 2020-06-08 | 2020-07-31 | 雅安市中甫新能源开发有限公司 | Additive for preparing high-concentration vanadium battery electrolyte and preparation method |
| CN114497664A (en) * | 2022-01-17 | 2022-05-13 | 武汉科技大学 | Vanadium battery negative electrode electrolyte and preparation method thereof |
| CN116387583A (en) * | 2023-06-06 | 2023-07-04 | 北京普能世纪科技有限公司 | All-vanadium redox flow battery capacity recovery method |
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