CN106997958A - A kind of method for eliminating all-vanadium redox flow battery electrolyte impurity effect - Google Patents
A kind of method for eliminating all-vanadium redox flow battery electrolyte impurity effect Download PDFInfo
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- CN106997958A CN106997958A CN201610046150.5A CN201610046150A CN106997958A CN 106997958 A CN106997958 A CN 106997958A CN 201610046150 A CN201610046150 A CN 201610046150A CN 106997958 A CN106997958 A CN 106997958A
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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
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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
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
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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
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04276—Arrangements for managing the electrolyte stream, e.g. heat exchange
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- 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
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Abstract
The invention discloses a kind of method for eliminating all-vanadium redox flow battery electrolyte impurity effect, complexing agent is added into the electrolyte, is sufficiently stirred for, the complexing agent is phosphoric acid, inorganic phosphate, hydramine, aminocarboxylate, hydroxycarboxylate or organic phosphate.The present invention saves or reduces the removal step in electrolyte preparation process, and operating procedure is simple, products material is abundant, it is not necessary to which the complicated contaminant removal equipment of matching, removal of impurities cost is low, suitable for scale application；By way of adding complexing agent, make foreign metal ion formation complexing body, and make its reaction electricity interval to offsetting out all-vanadium redox flow battery electrolyte active material reaction potential, eliminate the rush liberation of hydrogen effect of metal ion, reduce flow battery hydrogen amount of precipitation, capacity attenuation is reduced, extends the flow battery life-span；The foreign ion that flow battery is introduced in construction, operation and maintenance process can be eliminated rapidly, and method is easy, suitable for popularization and application.
Description
Technical field
It is more particularly to a kind of to eliminate all-vanadium redox flow battery electrolyte impurity effect the present invention relates to flow battery technology field
Method.
Background technology
On a large scale, the long-life, low cost, it is environment-friendly be energy storage technology development Main way.Including storage of drawing water
In the various scale technical field of energy storage such as energy, compressed-air energy storage, sodium-sulphur battery, lithium ion battery, lead-acid battery,
All-vanadium flow battery energy storage technology is because of its service life length, safe and reliable, energy storage scale is big, batteryuniformity is good, nothing
Pollution, answer speed is fast, the features such as can directly monitor its charging and discharging state in real time, it has also become the head of scale energy storage technology
One of selecting technology.
All-vanadium flow battery is mainly made up of pile, electrolyte and electrolyte circulation system, and wherein electrolyte is full vanadium liquid
The active material of galvanic battery electrochemical reaction and the carrier of electric energy, are the critical materials of all-vanadium flow battery, therefore electrolysis
The quality of liquid has a direct impact to all-vanadium flow battery performance.
The factor of influence electrolyte quality mainly has concentration of electrolyte, the stability of electrolyte and dopant species and content.
Because the reaction potential of foreign ion is interval overlapping with active material reaction potential interval, cause foreign ion partly
The redox reaction that active material is carried out is participated in, so that the respond of active material is reduced, in addition, impurity
The presence of ion can also further promote the evolving hydrogen reaction of flow battery so that the capacity attenuation increase of flow battery, property
Can significantly it decline with the life-span.At present, all-vanadium redox flow battery electrolyte goes deimpurity common method to be recrystallization, alkali
Dissolving, extraction：
CN103606694A discloses a kind of preparation method of commercial all-vanadium redox flow battery electrolyte, and it uses vanadium raw materials
Alkali soluble solution, uses acid-base accommodation pH value, and then precipitation repeatedly obtains the oxide of vanadium to remove impurity element by roasting,
With concentrated sulfuric acid dissolution to remove the impurity such as iron, chromium, silicon, manganese.
CN103482702A discloses the method for preparing high-purity barium oxide and high-purity used for all-vanadium redox flow battery electrolysis
Liquid, it is molten to barium oxide progress weight under the conditions of different PH, filtered by removal of impurities twice and three times, then by washing
Wash, dry, roasting technique, to remove Cr, Si, Fe, Al, K, Na impurity.
CN104064795A discloses a kind of preparation method of high-purity sulfuric acid vanadyl electrolyte, by sodium hydroxide vanadium
Slag and bone coal are extracted, and obtain the oxygen vanadium sulphate solution that pH is 3.0~4.0, by extraction, inorganic reduction, hybrid extraction,
Multiple step purification electrolysis liquid such as back extraction, organic reducing, presoma concentration.
Prior art is to add removal step before production electrolyte, although with certain effect, but existed
Problems with：
1st, the amount of impurities of removal, limitednumber, it is impossible to thoroughly go influence of the removal of impurity to electrolyte；2nd, removal of impurities is walked
Rapid cumbersome, the substantial amounts of professional equipment of needs and high-purity reagent；3rd, thick removal of impurities is only applicable to, it is relatively low for impurity content
Electrolyte go removal of impurity cost to be multiplied；4th, what is introduced in subsequent production, construction, operation and maintenance process is miscellaneous
Matter influence can not still be excluded.
The content of the invention
The technical problem to be solved in the present invention is that the defect for overcoming above-mentioned prior art eliminates all-vanadium flow electricity there is provided one kind
The method of pond electrolyte impurity effect, can reduce the removal step in electrolyte preparation process, and can mitigate and
Eliminate the negative effect of micro impurity element in all-vanadium flow battery running.
The technical scheme that the present invention is provided is, a kind of method for eliminating impurity effect in all-vanadium redox flow battery electrolyte, to
Add complexing agent in the electrolyte, be sufficiently stirred for, be allowed to metal impurities ion complexation, the complexing agent be phosphoric acid,
Inorganic phosphate, hydramine, aminocarboxylate, hydroxycarboxylate or organic phosphate.As preferred technical scheme,
The impurity is the solubility or microsolubility sulfate of subgroup element.
As preferred technical scheme, the impurity is the 4th subgroup element, the 6th subgroup element, the 7th subgroup element, the
8 subgroup elements, the 1st subgroup element or the 2nd subgroup element.
As preferred technical scheme, the content of impurity is 0-1000ppm in the electrolyte.
As preferred technical scheme, methods described is operated at 0-50 DEG C of temperature range.
As preferred technical scheme, the vanadium ion valence state of the electrolyte is at least one of 2+, 3+, 4+, 5+.
As preferred technical scheme, the solvent of the electrolyte is sulfuric acid and/or hydrochloric acid.
As preferred technical scheme, sulfuric acid concentration is 0-4.0mol/L in the electrolyte.
As preferred technical scheme, concentration of hydrochloric acid is 0-4.0mol/L in the electrolyte.
As preferred technical scheme, methods described is before all-vanadium redox flow battery system operation or in running to described
Complexing agent is added in electrolyte.It can select that directly complexing agent is added in electrolyte, can also select in liquid stream electricity
On-line operation is carried out in cell system operation.It can select to be added only in anode electrolyte or electrolyte liquid, can also
Selection is added in anode electrolyte and electrolyte liquid simultaneously.
As preferred technical scheme, the complexing agent addition is complexing agent in terms of molar ratio:Impurity element
=1:0.01-1:100.
Complexing agent of the present invention is the compound with foreign ion formation coordinate bond, such as phosphoric acid, inorganic phosphate, alcohol
The ion complexation body of amine, aminocarboxylate, hydroxycarboxylate or organic phosphate etc., preferably sodium tripolyphosphate, three second
Hydramine, edetate disodium (EDTA), diethylenetriamine pentacarboxylic acid sodium, grape sodium saccharate, ethylenediamine tetraacetic methene
Sodium phosphate.
The principle of the complexing agent and foreign ion formation complexing group is as follows：The complexing agent provides lone pair electrons or many
Individual delocalized electrons, makes the empty atomic orbital of foreign ion receive lone pair electrons or delocalized electrons and form coordinate bond, enters
And by complexing agent together with foreign ion closely complexing.
The present invention has abandoned the technical scheme of the conventional removal foreign ion of prior art, by considering ionic impurity to liquid
The capacity attenuation that the liberation of hydrogen of galvanic battery influences and brought, and then attempt to solve " reduction or the liberation of hydrogen energy for eliminating foreign ion
The technical problem of power ".The principle of the present invention is explained in detail herein below：
All-vanadium flow battery why can discharge and recharge be due to following two reactions：
Positive pole reacts：VO2++H2O=VO2 ++2H++e-E=1.000V
Negative reaction：V2+=V3++e-E=-0.255V
Therefore, all-vanadium flow battery active material normally reacts potential interval between -0.255-1.000V.Due to miscellaneous
The presence of matter ion, hydrionic loss can be caused with hydrogen ion reaction and hydrogen is separated out, so as to cause battery charging and discharging
The decline of capacity.Most of metal ion electricity present in electrolyte to reaction potential E (Mx+/My+)(x,y∈
0,1,2,3 ... and x>Y) all-vanadium redox flow battery electrolyte active material is overlapped on completely or partially normally react potential interval
Interior, the presence of these foreign ions can promote the hydrogen amount of precipitation of flow battery in terms of two：
(1) metal simple-substance insoluble in acid is separated out in battery charge and discharge process, these metal simple-substances have liberation of hydrogen effect；
(2) metal simple-substance for being dissolved in acid is separated out in battery charge and discharge process, these simple substance are produced with hydrogen ion reaction in solution
Hydrogen causes liberation of hydrogen；
(3) metal ion electricity is to participation redox reaction in battery charge and discharge process and promotes liberation of hydrogen.
Due to adding complexing agent, foreign ion is combined rapidly with complexing agent, and forms more stable ion complexation body,
Carry out discharge and recharge when, the ion complexation body is not involved in redox reaction, although or subparticipation redox it is anti-
Should, but its reaction potential is not interval overlapping with all-vanadium flow battery reaction potential interval, so as to fundamentally solve
Liberation of hydrogen is acted on caused by foreign ion.
The reaction electricity that the present invention makes it possible to produce evolving hydrogen reaction by adding complexing agent is electrolysed to deviateing all-vanadium flow battery
The potential of liquid is interval, i.e.,：E’(Mx+/My+) ＜ -0.255 or E ' (Mx+/My+) ＞ 1.000V so that avoid the metal from
The promotion liberation of hydrogen effect of son, reaches the effect of reduction cell with hydrogen air elutriation output.
Beneficial effects of the present invention：
1st, the removal step in electrolyte preparation process is saved or reduces, operating procedure is simple, products material is abundant, no
The contaminant removal equipment for needing matching complicated, removal of impurities cost is low, suitable for scale application；
2nd, by way of adding complexing agent, foreign metal ion formation complexing body is made, and make its reaction electricity to offsetting out
All-vanadium flow battery active material reaction potential is interval, eliminates the rush liberation of hydrogen effect of metal ion, reduces flow battery hydrogen
Air elutriation output, reduces capacity attenuation, extends the flow battery life-span；
3rd, the foreign ion that flow battery is introduced in construction, operation and maintenance process can be eliminated rapidly, and method is easy,
Suitable for popularization and application.
Embodiment
Following non-limiting examples can make one of ordinary skill in the art be more fully understood the present invention, but not with
Any mode limits the present invention.
Embodiment 1
It is electrolysed liquid status：Sulfate concentration 2.0mol/L；Vanadium ion concentration 1.6mol/L；Impurity element and content Ti
Ion 600ppm；Complexing agent：2g sodium tripolyphosphates, solid-state；Analysis is pure；Operating procedure：In environment temperature
Under the conditions of 32 DEG C；2g sodium tripolyphosphates are respectively added in both positive and negative polarity electrolyte, and stirred, make impurity
Ion is fully complexed with complexing agent.
The power of battery：5W, tester：Arbin discharge and recharge instrument；Charge and discharge mode method：Constant current charge-discharge pattern；
It is electrolysed lyolysis liquid consumption：Each 80mL of both positive and negative polarity；Discharge and recharge blanking voltage：1.0-1.55V；Current density：80mA/cm2,
Carry out after 200 charge and discharge cycles, (comparative example is not dose the electrolyte of complexing agent, and other conditions are complete with embodiment
It is exactly the same)
Test result is as follows：
Embodiment 2
It is electrolysed liquid status：Sulfuric acid concentration 1.5mol/L；Concentration of hydrochloric acid 1.0mol/L；Vanadium ion concentration 1.6mol/L；It is miscellaneous
Prime element and content Cr ions 200ppm；Complexing agent：743g triethanolamines, solid-state；Analysis is pure；Operation
Technique：Under the conditions of environment temperature is 45 DEG C；743g triethanolamines are respectively added in both positive and negative polarity electrolyte, and
Stir, foreign ion is fully complexed with complexing agent.
The power of battery：1kW, tester：Arbin discharge and recharge instrument；Charge and discharge mode method：Constant current charge-discharge mould
Formula；It is electrolysed lyolysis liquid consumption：Each 35L of both positive and negative polarity；Discharge and recharge blanking voltage：10.0-15.5V；Current density：
80mA/cm2, carry out after 100 charge and discharge cycles, (comparative example is not dose the electrolyte of complexing agent, other conditions
It is identical with embodiment)
Test result is as follows：
Embodiment 3
It is electrolysed liquid status：Sulfuric acid concentration 2.0mol/L；Vanadium ion concentration 1.6mol/L；Impurity element and content Mn from
Sub- 150ppm；Complexing agent：1875g sodium gluconates, solid-state；Analysis is pure；Operating procedure：In environment temperature
Spend under the conditions of 45 DEG C；1875g sodium gluconates are respectively added in both positive and negative polarity electrolyte, and stirred,
Foreign ion is set fully to be complexed with complexing agent.
The power of battery：20kW, tester：Arbin discharge and recharge instrument；Charge and discharge mode method：Constant current charge-discharge mould
Formula；It is electrolysed lyolysis liquid consumption：Each 300L of both positive and negative polarity；Discharge and recharge blanking voltage：52.0-80.6V；Current density：
80mA/cm2, carry out after 80 charge and discharge cycles, (comparative example is not dose the electrolyte of complexing agent, other conditions
It is identical with embodiment)
Test result is as follows：
Embodiment 4
It is electrolysed liquid status：Sulfuric acid concentration 2.0mol/L；Vanadium ion concentration 1.6mol/L；Impurity element and content F e from
Sub- 500ppm；Complexing agent：3750g disodium ethylene diamine tetraacetates, solid-state；Analysis is pure；Operating procedure：
Environment temperature is under the conditions of 30 DEG C；3750g disodium ethylene diamine tetraacetates are respectively added in both positive and negative polarity electrolyte,
And stir, foreign ion is fully complexed with complexing agent.
The power of battery：30kW, tester：Arbin discharge and recharge instrument；Charge and discharge mode method：Constant current charge-discharge mould
Formula；It is electrolysed lyolysis liquid consumption：Each 300L of both positive and negative polarity；Discharge and recharge blanking voltage：52.0-80.6V；Current density：
80mA/cm2, carry out after 70 charge and discharge cycles, (comparative example is not dose the electrolyte of complexing agent, other conditions
It is identical with embodiment)
Test result is as follows：
Embodiment 5
The box all-vanadium redox flow battery systems of 250kW/500kWh, invariable power discharge and recharge, discharge and recharge are carried out with rated power
Blanking voltage：416.0-642.4V.It is electrolysed liquid status as follows：Sulfuric acid concentration 2.0mol/L；Vanadium ion concentration 1.6mol/L；
Impurity element and content Ni ions 300ppm.
Battery system is kept in online running, under the conditions of environment temperature is 27 DEG C, by 2500g complexing agent (second
The methene sodium phosphate of diamines four, solid-state；Analysis is pure) it is separately added into and is respectively added in both positive and negative polarity electrolyte, battery system
Running status is kept, and is carried out after 2~3 charge and discharge cycles, foreign ion is well mixed with complexing agent and network
Close.Battery system proceeds after 40 charge and discharge cycles, (comparative example is not dose the electrolyte of complexing agent, other
Condition is identical with embodiment)
Test result is as follows：
Embodiment 6
It is electrolysed liquid status：Sulfuric acid concentration 2.0mol/L；Vanadium ion concentration 1.6mol/L；Impurity element and content Cu from
Sub- 700ppm；Complexing agent：1050g diethylenetriamine pentacarboxylic acid sodium, solid-state；Analysis is pure；200g ethylenediamines
Four methene sodium phosphates；Solid-state；Analysis is pure；Operating procedure：Under the conditions of environment temperature is 35 DEG C；1050g divinyls
Triamine pentacarboxylic acid sodium and 200g ethylenediamine tetraacetic methene sodium phosphates are added in both positive and negative polarity electrolyte, and stir, and make
Foreign ion is fully complexed with complexing agent.
The power of battery：2kW, tester：Arbin discharge and recharge instrument；Charge and discharge mode method：Constant current charge-discharge mould
Formula；It is electrolysed lyolysis liquid consumption：Each 35L of both positive and negative polarity；Discharge and recharge blanking voltage：20.0-31.0V；Current density：
80mA/cm2, carry out after 100 charge and discharge cycles, (comparative example is not dose the electrolyte of complexing agent, other conditions
It is identical with embodiment)
Test result is as follows：
Embodiment 7
100kW/250kWh all-vanadium redox flow battery systems, invariable power discharge and recharge, discharge and recharge cut-off are carried out with rated power
Voltage：208-322.4V.It is electrolysed liquid status as follows：Sulfuric acid concentration 2.0mol/L；Vanadium ion concentration 1.6mol/L；
Impurity element and content Cr ions 300ppm；Mo ions 200ppm；Mn ions 100ppm.
Under the conditions of environment temperature is 30 DEG C, battery system is run after 10 charge and discharge cycles, by 500g complexing agents
(sodium tripolyphosphate；Solid-state；Analysis is pure) it is separately added into and is respectively added in both positive and negative polarity electrolyte, battery system continues
In running status, and carry out after 2~3 charge and discharge cycles, foreign ion is well mixed and is complexed with complexing agent.
Battery system proceeds after 50 charge and discharge cycles, and (comparative example is not dose the electrolyte of complexing agent, other conditions
It is identical with embodiment)
Test result is as follows：
Embodiment 8
It is electrolysed liquid status：Sulfuric acid concentration 2.0mol/L；Vanadium ion concentration 1.6mol/L；Impurity element and content Zn from
Sub- 850ppm；Complexing agent：1500g phosphoric acid；Solid-state；Analysis is pure；Operating procedure：It it is 28 DEG C in environment temperature
Under the conditions of；After system operation 10 is circulated, 1500g phosphoric acid is added in both positive and negative polarity electrolyte, and stirred,
Continue to run with change before and after 90 circulations, contrast plus complexing agent.
The power of battery：10kW；Tester：Arbin discharge and recharge instrument；Charge and discharge mode method：Constant current charge-discharge mould
Formula；It is electrolysed lyolysis liquid consumption：Each 300L of both positive and negative polarity；Discharge and recharge blanking voltage：26.0-40.3V；Current density：
80mA/cm2。
Test result is as follows：
Claims (10)
1. a kind of method for eliminating all-vanadium redox flow battery electrolyte impurity effect, it is characterised in that into the electrolyte
Complexing agent is added, is sufficiently stirred for, the complexing agent is phosphoric acid, inorganic phosphate, hydramine, aminocarboxylate, hydroxyl
Carboxylate or organic phosphate.
2. according to the method described in claim 1, it is characterised in that the impurity is soluble or micro- for subgroup element
Insoluble sulfates.
3. method according to claim 2, it is characterised in that the impurity is the 4th subgroup element, the 6th subgroup
Element, the 7th subgroup element, the 8th subgroup element, the 1st subgroup element or the 2nd subgroup element.
4. according to the method described in claim 1, it is characterised in that the content of impurity is in the electrolyte
0-1000ppm。
5. according to the method described in claim 1, it is characterised in that the complexing agent is sodium tripolyphosphate, three ethanol
In amine, edetate disodium, diethylenetriamine pentacarboxylic acid sodium, sodium gluconate or ethylenediamine tetraacetic methene sodium phosphate
It is one or more of.
6. according to the method described in claim 1, it is characterised in that methods described is operated at 0-50 DEG C of temperature range.
7. according to the method described in claim 1, methods described is before all-vanadium redox flow battery system operation or run
Complexing agent is added in electrolyte described in Cheng Zhongxiang.
8. according to the method described in claim 1, it is characterised in that the vanadium ion valence state of the electrolyte be 2+, 3+,
At least one of 4+, 5+.
9. according to the method described in claim 1, it is characterised in that the solvent of the electrolyte is sulfuric acid and/or hydrochloric acid.
10. according to the method described in claim 1, it is characterised in that the complexing agent addition in terms of molar ratio,
For complexing agent:Impurity element=1:0.01-1:100.
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| CN107799798A (en) * | 2017-10-26 | 2018-03-13 | 成都先进金属材料产业技术研究院有限公司 | The minimizing technology of iron ion in a kind of V electrolyte |
| CN107910578A (en) * | 2017-10-26 | 2018-04-13 | 成都先进金属材料产业技术研究院有限公司 | The minimizing technology of nickel ion in a kind of V electrolyte |
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| CN107799798A (en) * | 2017-10-26 | 2018-03-13 | 成都先进金属材料产业技术研究院有限公司 | The minimizing technology of iron ion in a kind of V electrolyte |
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| CN109841885A (en) * | 2017-11-28 | 2019-06-04 | 中国科学院大连化学物理研究所 | The method of high concentration electrolyte liquid stability when improving all-vanadium flow battery operation |
| CN109841885B (en) * | 2017-11-28 | 2021-06-29 | 中国科学院大连化学物理研究所 | Method for improving stability of high-concentration negative electrolyte during operation of all-vanadium redox flow battery |
| CN108666604A (en) * | 2018-03-21 | 2018-10-16 | 广东省稀有金属研究所 | A kind of vanadic sulfate electrolyte copper-removing method of all-vanadium flow battery |
| CN110970646B (en) * | 2018-09-29 | 2021-06-25 | 中国科学院大连化学物理研究所 | Application of additive in negative electrode electrolyte of all-vanadium redox flow battery |
| CN110970646A (en) * | 2018-09-29 | 2020-04-07 | 中国科学院大连化学物理研究所 | Application of additive in negative electrode electrolyte of all-vanadium redox flow battery |
| CN111200152A (en) * | 2018-11-19 | 2020-05-26 | 大连融科储能技术发展有限公司 | Formula and process of all-vanadium redox flow battery electrolyte |
| CN111446477A (en) * | 2020-04-03 | 2020-07-24 | 武汉科技大学 | Method for regenerating failure electrolyte of all-vanadium redox flow battery |
| 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 |
| CN111446478B (en) * | 2020-04-03 | 2021-05-04 | 武汉科技大学 | Method for preparing vanadium battery electrolyte by taking vanadium-rich liquid as raw material |
| CN114540918A (en) * | 2022-03-25 | 2022-05-27 | 陕西工业职业技术学院 | Electrolyte, preparation method thereof and preparation method of magnesium alloy micro-arc oxidation coating |
| WO2024056104A1 (en) * | 2022-09-15 | 2024-03-21 | 大连融科储能集团股份有限公司 | Vanadium-chromium electrolyte, preparation method therefor, and flow battery comprising same |
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