CN112582659A - Vanadium redox flow battery electrolyte and preparation method thereof - Google Patents
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- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
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Abstract
The invention discloses a vanadium redox flow battery electrolyte and a preparation method thereof, and the technical scheme is as follows: the electrolyte comprises a positive electrolyte and a negative electrolyte, wherein the positive electrolyte comprises water, sulfuric acid, pentavalent vanadium ions and a sulfate additive, and the negative electrolyte comprises trivalent vanadium ions and a chlorine-containing additive; according to the invention, cheap vanadium pentoxide is used as a basic raw material, the vanadium redox flow battery electrolyte is prepared by an electrolytic method, the production cost is greatly reduced, and the purity of the electrolyte is improved, so that the vanadium redox flow battery technology can be applied to actual production in a large scale.
Description
Technical Field
The invention belongs to the field of electrolyte, and particularly relates to vanadium redox flow battery electrolyte and a preparation method thereof.
Background
The vanadium battery is called as an all-vanadium redox flow battery, is an oxidation-reduction battery with an active substance in a circulating flow liquid state, is used for peak shaving and wind energy storage of a power station at present, and is a fixed (relative to the use of an electric vehicle) vanadium battery, so that the development is rapid, a high-power vanadium battery energy storage system is put into practical use, and the commercialization process of the vanadium battery energy storage system is promoted fully; the electric energy of the vanadium battery is stored in sulfuric acid electrolyte of vanadium ions with different valence states in a chemical energy mode, the electrolyte is pressed into a battery stack body through an external pump and circularly flows in closed loops of different liquid storage tanks and half batteries under the action of mechanical power, a proton exchange membrane is adopted as a diaphragm of a battery pack, the electrolyte solution parallelly flows through the surface of an electrode and generates electrochemical reaction, and current is collected and conducted through double electrode plates, so that the chemical energy stored in the solution is converted into electric energy. The reversible reaction process enables the vanadium battery to complete charging, discharging and recharging smoothly.
Most of existing vanadium batteries are prepared by directly dissolving vanadium sulfate oxide, but the vanadium sulfate oxide is high in price, so that the vanadium sulfate oxide is high in production cost and low in purity, and cannot be applied to actual production in a large scale.
Disclosure of Invention
The invention aims to provide a vanadium redox flow battery electrolyte and a preparation method thereof, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the electrolyte of the vanadium redox flow battery comprises a positive electrolyte and a negative electrolyte, wherein the positive electrolyte comprises water, sulfuric acid, pentavalent vanadium ions and a sulfate additive, and the negative electrolyte comprises trivalent vanadium ions and a chlorine-containing additive.
Preferably, the chlorine-containing additive comprises one or more of a normal chlorate solution, a meta chlorate solution, a chlorite solution, a hypochlorous acid solution, a perchloric acid solution, a normal chlorate solution, a meta chlorate solution, a chlorite solution, a hypochlorite solution, and a perchlorate solution.
Preferably, the concentration of the chlorine-containing additive in the negative electrode electrolyte is 2-3 mol/L.
Preferably, the concentration of vanadium ions in the negative electrode electrolyte is 0.6-6 mol/L.
Preferably, the sulfate additive includes one or more of ferric sulfate, sodium sulfate, magnesium sulfate, aluminum sulfate, potassium sulfate, calcium sulfate, barium sulfate, ferrous sulfate, copper sulfate, and aluminum potassium sulfate.
Preferably, the concentration of the sulfate additive in the positive electrode electrolyte is 0.1-0.9 mol/L.
Preferably, anodal electrolyte is stored in anodal electrolyte holds the jar, negative pole electrolyte is stored in negative pole electrolyte holds the jar, anodal electrolyte holds the jar and negative pole electrolyte holds and is provided with respectively on the jar and is used for with anodal electrolyte and the magnetic drive pump in the electrolytic cell is gone into to negative pole electrolyte.
Preferably, the total concentration of the sulfuric acid in the positive electrode electrolyte is 1.2-3.5 mol/L.
A preparation method of vanadium redox flow battery electrolyte is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: vanadium pentoxide is directly dissolved in sulfuric acid to a PH of 0.8, involving the reaction equation:
V2O5+2H+→2VO2+H2O；
V2O5+4H2SO4+H2O→V2O5·4S03·5H2O；
lgc(VO2+)＝-0.82-pH；
step two: adding the solution obtained in the step one and a chlorine-containing additive into a reaction kettle according to the molar ratio of 1:4, controlling the temperature of the reaction kettle to be 60 ℃, heating at a constant temperature, continuously reacting and dissolving vanadium pentoxide in the mixed solution, diluting the dissolved mixture by using deionized water until the dissolved mixture is viscous to prepare a suspension of 1.5mol L1 VO2+ +3mol L1H 2SO4 as a negative electrolyte;
step three: then 3mol of a mixed solution of the L1H 2SO4 solution and a sulfate additive is used as an anode electrolyte, a porous lead plate is used as a cathode, and Rulr/Ti and lrTa/Ti are respectively used as anodes;
step four: and injecting the positive electrolyte and the negative electrolyte into an electrolytic cell, and carrying out constant current electrolysis at a current density of 80mA cm & lt 2 & gt to obtain the electrolyte of the vanadium redox flow battery after the electrolysis is finished.
Preferably, an ion exchange membrane is disposed between the positive electrode electrolyte and the negative electrode electrolyte.
Compared with the prior art, the invention has the beneficial effects that:
according to the vanadium redox flow battery electrolyte and the preparation method, the vanadium pentoxide with low price is used as a basic raw material, and the vanadium redox flow battery electrolyte is prepared through an electrolytic method, so that the production cost is greatly reduced, the purity of the electrolyte is improved, the vanadium redox flow battery technology can be applied to actual production in a large scale, and the vanadium redox flow battery electrolyte prepared by the method has the advantages of high energy density, small occupied area, easiness in maintenance, large working temperature range, wide applicability and low operation stability and failure rate.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention;
FIG. 2 is one of the experimental analysis charts of the present invention;
FIG. 3 is a second experimental analysis chart of the present invention;
FIG. 4 is a third experimental analysis chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The electrolyte of the vanadium redox flow battery comprises a positive electrolyte and a negative electrolyte, wherein the positive electrolyte comprises water, sulfuric acid, pentavalent vanadium ions and a sulfate additive, and the negative electrolyte comprises trivalent vanadium ions and a chlorine-containing additive.
In the present embodiment, preferably, the chlorine-containing additive includes one or more of a normal chlorate solution, a meta chlorate solution, a chlorite solution, a hypochlorous acid solution, a perchloric acid solution, a normal chlorate solution, a meta chlorate solution, a chlorite solution, a hypochlorite solution, and a perchlorate solution.
In the present embodiment, it is preferable that the concentration of chloride ions in the negative electrode electrolyte of the chlorine-containing additive is 2.5 mol/L.
In this embodiment, the concentration of vanadium ions in the negative electrode electrolyte is preferably 3.9 mol/L.
In this embodiment, preferably, the sulfate additive includes one or more of ferric sulfate, sodium sulfate, magnesium sulfate, aluminum sulfate, potassium sulfate, calcium sulfate, barium sulfate, ferrous sulfate, copper sulfate, and aluminum potassium sulfate.
In this embodiment, the concentration of the sulfate additive in the positive electrode electrolyte is preferably 0.4 mol/L.
In this embodiment, it is preferable that the positive electrode electrolyte is stored in the positive electrode electrolyte storage tank, the negative electrode electrolyte is stored in the negative electrode electrolyte storage tank, and the positive electrode electrolyte storage tank and the negative electrode electrolyte storage tank are respectively provided with a magnetic pump for pumping the positive electrode electrolyte and the negative electrode electrolyte into the electrolytic cell.
In this embodiment, the total concentration of sulfuric acid in the positive electrode electrolyte is preferably 2.8 mol/L.
A preparation method of vanadium redox flow battery electrolyte is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: vanadium pentoxide is directly dissolved in sulfuric acid to a PH of 0.8, involving the reaction equation:
V2O5+2H+→2VO2+H2O；
V2O5+4H2SO4+H2O→V2O5·4SO3·5H2O；
lgc(VO2+)＝–0.82–pH；
step two: adding the solution obtained in the step one and a chlorine-containing additive into a reaction kettle according to a molar ratio of 1:4, controlling the temperature of the reaction kettle to be 60 ℃, heating at a constant temperature, continuously reacting and dissolving vanadium pentoxide in the mixed solution, diluting the dissolved mixture by using deionized water until the dissolved mixture is viscous to prepare a suspension of 1.5mol L1 VO2+ +3mol L1H 2SO4 as a negative electrode electrolyte;
step three: then 3mol of a mixed solution of the L1H 2SO4 solution and a sulfate additive is used as an anode electrolyte, a porous lead plate is used as a cathode, and Rulr/Ti and lrTa/Ti are respectively used as anodes;
step four: and injecting the positive electrolyte and the negative electrolyte into an electrolytic cell, and carrying out constant current electrolysis at a current density of 80mA cm & lt 2 & gt to obtain the electrolyte of the vanadium redox flow battery after the electrolysis is finished.
In this embodiment, an ion exchange membrane is preferably provided between the positive electrode electrolyte and the negative electrode electrolyte.
The working principle and the using process of the invention are as follows:
according to the invention, cheap vanadium pentoxide is used as a basic raw material, the vanadium redox flow battery electrolyte is prepared by an electrolytic method, the production cost is greatly reduced, and the purity of the electrolyte is improved, so that the vanadium redox flow battery technology can be applied to actual production in a large scale.
Example 2
The electrolyte of the vanadium redox flow battery comprises a positive electrolyte and a negative electrolyte, wherein the positive electrolyte comprises water, sulfuric acid, pentavalent vanadium ions and a sulfate additive, and the negative electrolyte comprises trivalent vanadium ions and a chlorine-containing additive.
In the present embodiment, preferably, the chlorine-containing additive includes one or more of a normal chlorate solution, a meta chlorate solution, a chlorite solution, a hypochlorous acid solution, a perchloric acid solution, a normal chlorate solution, a meta chlorate solution, a chlorite solution, a hypochlorite solution, and a perchlorate solution.
In the present embodiment, it is preferable that the concentration of chloride ions in the negative electrode electrolyte of the chlorine-containing additive is 2.5 mol/L.
In this embodiment, the concentration of vanadium ions in the negative electrode electrolyte is preferably 4 mol/L.
In this embodiment, preferably, the sulfate additive includes one or more of ferric sulfate, sodium sulfate, magnesium sulfate, aluminum sulfate, potassium sulfate, calcium sulfate, barium sulfate, ferrous sulfate, copper sulfate, and aluminum potassium sulfate.
In this embodiment, the concentration of the sulfate additive in the positive electrode electrolyte is preferably 0.8 mol/L.
In this embodiment, it is preferable that the positive electrode electrolyte is stored in the positive electrode electrolyte storage tank, the negative electrode electrolyte is stored in the negative electrode electrolyte storage tank, and the positive electrode electrolyte storage tank and the negative electrode electrolyte storage tank are respectively provided with a magnetic pump for pumping the positive electrode electrolyte and the negative electrode electrolyte into the electrolytic cell.
In this embodiment, the total concentration of sulfuric acid in the positive electrode electrolyte is preferably 3.5 mol/L.
A preparation method of vanadium redox flow battery electrolyte is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: vanadium pentoxide is directly dissolved in sulfuric acid to a PH of 0.8, involving the reaction equation:
V2O5+2H+→2VO2+H2O；
V2O5+4H2SO4+H2O→V2O5·4SO3·5H2O；
lgc(VO2+)＝-0.82-pH；
step two: adding the solution obtained in the step one and a chlorine-containing additive into a reaction kettle according to the molar ratio of 1:4, controlling the temperature of the reaction kettle to be 60 ℃, heating at a constant temperature, continuously reacting and dissolving vanadium pentoxide in the mixed solution, diluting the dissolved mixture by using deionized water until the dissolved mixture is viscous to prepare a suspension of 1.5mol L1 VO2+ +3mol L1H 2SO4 as a negative electrolyte;
step three: then 3mol of a mixed solution of the L1H 2SO4 solution and a sulfate additive is used as an anode electrolyte, a porous lead plate is used as a cathode, and Rulr/Ti and lrTa/Ti are respectively used as anodes;
step four: and injecting the positive electrolyte and the negative electrolyte into an electrolytic cell, and carrying out constant current electrolysis at a current density of 80mA cm & lt 2 & gt to obtain the electrolyte of the vanadium redox flow battery after the electrolysis is finished.
The working principle and the using process of the invention are as follows:
according to the invention, cheap vanadium pentoxide is used as a basic raw material, the vanadium redox flow battery electrolyte is prepared by an electrolytic method, the production cost is greatly reduced, and the purity of the electrolyte is improved, so that the vanadium redox flow battery technology can be applied to actual production in a large scale.
Example 3
The electrolyte of the vanadium redox flow battery comprises a positive electrolyte and a negative electrolyte, wherein the positive electrolyte comprises water, sulfuric acid, pentavalent vanadium ions and a sulfate additive, and the negative electrolyte comprises trivalent vanadium ions and a chlorine-containing additive.
In the present embodiment, preferably, the chlorine-containing additive includes one or more of a normal chlorate solution, a meta chlorate solution, a chlorite solution, a hypochlorous acid solution, a perchloric acid solution, a normal chlorate solution, a meta chlorate solution, a chlorite solution, a hypochlorite solution, and a perchlorate solution.
In this embodiment, it is preferable that the concentration of chloride ions in the negative electrode electrolyte of the chlorine-containing additive is 2 mol/L.
In this embodiment, the concentration of vanadium ions in the negative electrode electrolyte is preferably 3 mol/L.
In this embodiment, preferably, the sulfate additive includes one or more of ferric sulfate, sodium sulfate, magnesium sulfate, aluminum sulfate, potassium sulfate, calcium sulfate, barium sulfate, ferrous sulfate, copper sulfate, and aluminum potassium sulfate.
In this embodiment, it is preferable that the positive electrode electrolyte is stored in the positive electrode electrolyte storage tank, the negative electrode electrolyte is stored in the negative electrode electrolyte storage tank, and the positive electrode electrolyte storage tank and the negative electrode electrolyte storage tank are respectively provided with a magnetic pump for pumping the positive electrode electrolyte and the negative electrode electrolyte into the electrolytic cell.
A preparation method of vanadium redox flow battery electrolyte is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: vanadium pentoxide is directly dissolved in sulfuric acid to a PH of 0.8, involving the reaction equation:
V2O5+2H+→2VO2+H2O；
V2O5+4H2SO4+H2O→V2O5·4SO3·5H2O；
lgc(VO2+)＝-0.82-pH；
step two: adding the solution obtained in the step one and a chlorine-containing additive into a reaction kettle according to the molar ratio of 1:4, controlling the temperature of the reaction kettle to be 60 ℃, heating at a constant temperature, continuously reacting and dissolving vanadium pentoxide in the mixed solution, diluting the dissolved mixture by using deionized water until the dissolved mixture is viscous to prepare a suspension of 1.5mol L1 VO2+ +3mol L1H 2SO4 as a negative electrolyte;
step three: then 3mol of a mixed solution of the L1H 2SO4 solution and a sulfate additive is used as an anode electrolyte, a porous lead plate is used as a cathode, and Rulr/Ti and lrTa/Ti are respectively used as anodes;
step four: and injecting the positive electrolyte and the negative electrolyte into an electrolytic cell, and carrying out constant current electrolysis at a current density of 80mA cm & lt 2 & gt to obtain the electrolyte of the vanadium redox flow battery after the electrolysis is finished.
In this embodiment, an ion exchange membrane is preferably provided between the positive electrode electrolyte and the negative electrode electrolyte.
The working principle and the using process of the invention are as follows:
according to the invention, cheap vanadium pentoxide is used as a basic raw material, the vanadium redox flow battery electrolyte is prepared by an electrolytic method, the production cost is greatly reduced, and the purity of the electrolyte is improved, so that the vanadium redox flow battery technology can be applied to actual production in a large scale.
Example 4
The electrolyte of the vanadium redox flow battery comprises a positive electrolyte and a negative electrolyte, wherein the positive electrolyte comprises water, sulfuric acid, pentavalent vanadium ions and a sulfate additive, and the negative electrolyte comprises trivalent vanadium ions and a chlorine-containing additive.
In the present embodiment, preferably, the chlorine-containing additive includes one or more of a normal chlorate solution, a meta chlorate solution, a chlorite solution, a hypochlorous acid solution, a perchloric acid solution, a normal chlorate solution, a meta chlorate solution, a chlorite solution, a hypochlorite solution, and a perchlorate solution.
In this embodiment, it is preferable that the concentration of chloride ions in the negative electrode electrolyte of the chlorine-containing additive is 3 mol/L.
In this embodiment, the concentration of vanadium ions in the negative electrode electrolyte is preferably 2 mol/L.
In this embodiment, preferably, the sulfate additive includes one or more of ferric sulfate, sodium sulfate, magnesium sulfate, aluminum sulfate, potassium sulfate, calcium sulfate, barium sulfate, ferrous sulfate, copper sulfate, and aluminum potassium sulfate.
In this embodiment, the concentration of the sulfate additive in the positive electrode electrolyte is preferably 0.6 mol/L.
In this embodiment, it is preferable that the positive electrode electrolyte is stored in the positive electrode electrolyte storage tank, the negative electrode electrolyte is stored in the negative electrode electrolyte storage tank, and the positive electrode electrolyte storage tank and the negative electrode electrolyte storage tank are respectively provided with a magnetic pump for pumping the positive electrode electrolyte and the negative electrode electrolyte into the electrolytic cell.
In this embodiment, the total concentration of sulfuric acid in the positive electrode electrolyte is preferably 3.5 mol/L.
A preparation method of vanadium redox flow battery electrolyte is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: vanadium pentoxide is directly dissolved in sulfuric acid to a PH of 0.8, involving the reaction equation:
V2O5+2H+→2VO2+H2O；
V2O5+4H2SO4+H2O→V2O5·4SO3·5H2O；
lgc(VO2+)＝-0.82-pH；
step two: adding the solution obtained in the step one and a chlorine-containing additive into a reaction kettle according to the molar ratio of 1:4, controlling the temperature of the reaction kettle to be 60 ℃, heating at a constant temperature, continuously reacting and dissolving vanadium pentoxide in the mixed solution, diluting the dissolved mixture by using deionized water until the dissolved mixture is viscous to prepare a suspension of 1.5mol L1 VO2+ +3mol L1H 2SO4 as a negative electrolyte;
step three: then 3mol of a mixed solution of the L1H 2SO4 solution and a sulfate additive is used as an anode electrolyte, a porous lead plate is used as a cathode, and Rulr/Ti and lrTa/Ti are respectively used as anodes;
step four: and injecting the positive electrolyte and the negative electrolyte into an electrolytic cell, and carrying out constant current electrolysis at a current density of 80mA cm & lt 2 & gt to obtain the electrolyte of the vanadium redox flow battery after the electrolysis is finished.
The working principle and the using process of the invention are as follows:
according to the invention, cheap vanadium pentoxide is used as a basic raw material, the vanadium redox flow battery electrolyte is prepared by an electrolytic method, the production cost is greatly reduced, and the purity of the electrolyte is improved, so that the vanadium redox flow battery technology can be applied to actual production in a large scale.
The electrolyte of the vanadium redox flow battery prepared by the invention and the electrolyte prepared by the conventional method are subjected to the following experiments:
experiment one, cyclic voltammetry test: an electrochemical test system CS300 tests the cyclic voltammetry characteristics of the electrolyte of the vanadium redox flow battery prepared by the invention and the conventional electrolyte, the test system adopts a three-electrode system, a counter electrode is a platinum sheet electrode with the thickness of 15mm multiplied by 15mm, a reference electrode is a saturated calomel electrode, a working electrode is a graphite electrode (phi 5mm), the scanning speed is 20mV s1, and the scanning voltage range is 1-1.5V.
Experiment two, alternating current impedance test: and assembling a three-electrode system according to the method, carrying out alternating current impedance test on the vanadium redox flow battery electrolyte prepared by the method and the conventional electrolyte on an electrochemical workstation, scanning the electrolyte from a high-frequency region to a low-frequency region, wherein the scanning frequency range is 100KHz-10mHz, the amplitude of an alternating current signal is 10mV, and fitting analysis of alternating current impedance data is carried out by means of alternating current impedance analysis software ZsimWin.
Experiment three, charge and discharge test: the method comprises the following steps of (1) taking a graphite felt with the thickness of 84mm multiplied by 90mm multiplied by 5mm as an electrode, taking Nafion117 as a diaphragm, assembling a self-made frame and a graphite current collector into a test battery, and carrying out cyclic charge and discharge tests on the electrolyte of the vanadium redox flow battery prepared by the method and a conventional electrolyte by using a battery performance test system CT-3008W-5V 6A-A; the current density is 40mAcm2, the charge cut-off voltage is 1.55V, the discharge cut-off voltage is 1.1V, the flow rate of a peristaltic pump is 100 mL/min 1, the standing time is 2min, and the cathode is sealed to prevent oxidation after being filled with argon.
To sum up, the experimental results of experiment one, experiment two and experiment three are summarized in table one as comparative example 1, example 2, example 3, example 4 and the conventional method, the effect is replaced by numerical values, and the higher the numerical value is, the more excellent the effect is;
| experiment one | Experiment two | Experiment three | |
| Example 1 | 100 | 100 | 100 |
| Example 2 | 87 | 82 | 79 |
| Example 3 | 92 | 89 | 95 |
| Example 4 | 89 | 92 | 97 |
| Conventional methods | 89 | 85 | 79 |
Watch 1
From the table, it is known that the electrolyte of the vanadium redox flow battery prepared in example 1 has the best test effect.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The electrolyte of the vanadium flow battery is characterized in that: the electrolyte comprises a positive electrolyte and a negative electrolyte, wherein the positive electrolyte comprises water, sulfuric acid, pentavalent vanadium ions and a sulfate additive, and the negative electrolyte comprises trivalent vanadium ions and a chlorine-containing additive.
2. The vanadium flow battery electrolyte as claimed in claim 1, wherein: the chlorine-containing additive comprises one or more of a normal chlorate solution, a meta chlorate solution, a chlorous acid solution, a hypochlorous acid solution, a perchloric acid solution, a normal chlorate solution, a meta chlorate solution, a chlorite solution, a hypochlorite solution and a perchlorate solution.
3. The vanadium flow battery electrolyte as claimed in claim 1, wherein: the concentration of chloride ions in the negative electrode electrolyte of the chlorine-containing additive is 2-3 mol/L.
4. The vanadium flow battery electrolyte as claimed in claim 1, wherein: the concentration of vanadium ions in the negative electrode electrolyte is 0.6-6 mol/L.
5. The vanadium flow battery electrolyte as claimed in claim 1, wherein: the sulfate additive comprises one or more of ferric sulfate, sodium sulfate, magnesium sulfate, aluminum sulfate, potassium sulfate, calcium sulfate, barium sulfate, ferrous sulfate, copper sulfate and aluminum potassium sulfate.
6. The vanadium flow battery electrolyte as claimed in claim 1, wherein: the concentration of the sulfate additive in the positive electrolyte is 0.1-0.9 mol/L.
7. The vanadium flow battery electrolyte as claimed in claim 1, wherein: anodal electrolyte is stored in anodal electrolyte holds the jar, negative pole electrolyte is stored in negative pole electrolyte holds the jar, anodal electrolyte hold the jar and negative pole electrolyte holds and is provided with respectively on the jar and is used for with anodal electrolyte and the magnetic drive pump in the electrolytic bath is gone into to negative pole electrolyte.
8. The vanadium flow battery electrolyte as claimed in claim 1, wherein: the total concentration of sulfuric acid in the anode electrolyte is 1.2-3.5 mol/L.
9. A preparation method of vanadium redox flow battery electrolyte is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: vanadium pentoxide is directly dissolved in sulfuric acid to a PH of 0.8, involving the reaction equation:
V2O5+2H+→2VO2+H2O；
V2O5+4H2SO4+H2O→V2O5·4SO3·5H2O；
lgc(VO2+)＝–0.82–pH；
step two: adding the solution obtained in the step one and a chlorine-containing additive into a reaction kettle according to a molar ratio of 1:4, controlling the temperature of the reaction kettle to be 60 ℃, heating at a constant temperature, continuously reacting and dissolving vanadium pentoxide in the mixed solution, diluting the dissolved mixture by using deionized water until the dissolved mixture is viscous to prepare a suspension of 1.5mol L1 VO2+ +3mol L1H 2SO4 as a negative electrolyte;
step three: then 3mol of a mixed solution of the L1H 2SO4 solution and a sulfate additive is used as an anode electrolyte, a porous lead plate is used as a cathode, and RuIr/Ti and IrTa/Ti are respectively used as anodes;
step four: and injecting the positive electrolyte and the negative electrolyte into an electrolytic cell, and carrying out constant current electrolysis at a current density of 80mA cm & lt 2 & gt to obtain the electrolyte of the vanadium redox flow battery after the electrolysis is finished.
10. The method for preparing the electrolyte of the vanadium flow battery according to claim 9, wherein the method comprises the following steps: and an ion exchange membrane is arranged between the positive electrolyte and the negative electrolyte.
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