CN106876763A - A kind of all-vanadium flow battery - Google Patents
A kind of all-vanadium flow battery Download PDFInfo
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- CN106876763A CN106876763A CN201510923780.1A CN201510923780A CN106876763A CN 106876763 A CN106876763 A CN 106876763A CN 201510923780 A CN201510923780 A CN 201510923780A CN 106876763 A CN106876763 A CN 106876763A
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- electrolyte
- vanadium
- flow battery
- ion concentration
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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
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
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- 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
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The present invention relates to a kind of all-vanadium flow battery, belong to flow battery field.A kind of all-vanadium flow battery, including anode electrolyte and electrolyte liquid, it is characterised in that：Anode electrolyte is identical with the total vanadium amount in electrolyte liquid, and vanadium ion concentration is 1.1~1.5 times of vanadium ion concentration in electrolyte liquid in anode electrolyte.Capacity attenuation of the all-vanadium flow battery that the present invention is provided in cyclic process is greatly improved.
Description
Technical field
The present invention relates to a kind of all-vanadium flow battery, belong to flow battery field.
Background technology
All-vanadium flow battery, with it is safe, have extended cycle life, fast response time the features such as, be especially suitable for the demand of extensive energy storage.
In all-vanadium redox flow battery system, electrolyte is respectively stored in both positive and negative polarity storage tank, is circulated between pile and electrolyte storage tank by circulating pump, and
There is redox reaction in electrode surface, realize the storage and release of electric energy.
The concentration and volume of the both positive and negative polarity electrolyte storage tank electrolyte inside original state of usual all-vanadium redox flow battery system is
Identical, with the carrying out of battery system charge and discharge cycles, vanadium ion and water may occur lateral by electrode one through ion-conductive membranes in electrolyte
Opposite side is migrated, and causes volume, the vanadium ion concentration of both positive and negative polarity electrolyte, sulfate concentration to change, so as to cause battery capacity to decline
Subtract.Patent EP1143546 is mentioned has liquid level difference using initial both positive and negative polarity electrolyte, while both positive and negative polarity electrolyte storage tank bottom sets connecting pipeline
Compensation electrolyte migration brings capacity attenuation, although the method can to a certain extent delay the capacity attenuation of battery, the patent is not
Electrolyte liquid liquid level difference height, concentration of electrolyte is aligned clearly to be limited.In the prior art, when flow battery capacity attenuation is to necessarily
, it is necessary to the later stage takes the new electrolyte of supplement, readjusts both positive and negative polarity concentration of electrolyte and volume or later stage addition electrolyte addition after degree
The modes such as agent realize that electrolyte volume volume recovers or delays.But above method by the extra operation for increasing battery and maintenance cost, is unfavorable for liquid again
The scale application of galvanic battery.
The content of the invention
It is an object of the invention to provide a kind of all-vanadium flow battery.
A kind of all-vanadium flow battery, including anode electrolyte and electrolyte liquid, anode electrolyte are identical with the total vanadium amount in electrolyte liquid, and
Vanadium ion concentration is 1.1~1.5 times of vanadium ion concentration in electrolyte liquid in anode electrolyte.
In above-mentioned technical proposal, total vanadium amount is that the concentration of vanadium ion in electrolyte is multiplied by electrolyte volume；The vanadium ion concentration is in electrolyte
The summation of the concentration of the vanadium ion of existing various valence states.Total vanadium amount in all-vanadium flow battery is ensured is identical, and vanadium ion in anode electrolyte
When total concentration is 1.1~1.5 times of vanadium ion total concentration in electrolyte liquid, then the volume of negative electrode liquid for anode electrolyte 1.1~
1.5 times.
In the prior art, all-vanadium flow battery includes anode electrolyte and electrolyte liquid, and the constituent of two kinds of electrolyte is identical, and two kinds
The volume of electrolyte is identical, total vanadium amount of anode electrolyte and electrolyte liquid is also identical.Be set to for all-vanadium flow battery initial electrolysis liquid by the present invention
Total vanadium amount of two kinds of electrolyte is identical, meanwhile, the volume of the volume more than anode electrolyte of electrolyte liquid, because battery is during circular flow,
Electrolyte reclaimed water moves to positive pole from negative pole, sets the volume of the volume more than anode electrolyte of electrolyte liquid so that electrolyte is from negative pole to just
The migration of pole is improved, and improves the capacity attenuation in cyclic process.Meanwhile, the sulfate concentration of the sulfate concentration than positive pole of electrolyte liquid
It is low, more conducively keep the stabilization of trivalent vanadium.
Vanadium ion concentration is 1.2~1.3 of vanadium ion concentration in electrolyte liquid in the flow battery of the present invention preferably anode electrolyte
Times.
The flow battery of the present invention preferably positive pole vanadium ion concentration is 1.4~1.7 mol/Ls.
Beneficial effects of the present invention are：
1) electrolyte can slow down the speed of flow battery capacity attenuation in original state, and the reduction later stage carries out the frequency of recovery operation；
2) by the way that concentration of electrolyte, Volume Changes can be improved with the holding of capacity in charge and discharge process, external harmful substance will not be introduced, also not
The later stage is needed to debug, practicality simple to operate.
Specific embodiment
Following non-limiting examples can make one of ordinary skill in the art that the present invention is more fully understood, but limit this hair never in any form
It is bright.
Comparative example 1
A kind of all-vanadium flow battery, design parameter is as follows：
Pile is constituted：Nafion115 films, 48cm2 monocells, service condition：Charge and discharge process, with 80mA/cm2 current densities
1.55V is charged to, 30 seconds are stood, 1.0V is discharged to 80mA/cm2 current densities, carry out 300 charge and discharge cycles.
Anode electrolyte：Vanadium ion concentration is 1.5mol/L, and the concentration ratio of wherein V3+ and V4+ is 1:1, sulfate ion concentration is
4.5mol/L；Electrolyte volume is 80ml.
Electrolyte liquid：Vanadium ion concentration is that the concentration ratio of 1.5mol/L, V3+ and V4+ is 1:1, sulfate ion concentration is 4.5mol/L；
Electrolyte volume is 80ml.
Embodiment 1
A kind of all-vanadium flow battery, design parameter is as follows：
Pile is constituted：Nafion115 films, 48cm2 monocells, service condition：Charge and discharge process, is charged to 80mA/cm2 current densities
1.55V, stands 30 seconds, and 1.0V is discharged to 80mA/cm2 current densities, carries out 300 charge and discharge cycles.
Anode electrolyte：Vanadium ion concentration is that the concentration ratio of 1.5mol/L, V3+ and V4+ is 1:1, sulfate ion concentration is 4.5mol/L；
Electrolyte volume is 80ml.
Electrolyte liquid：Vanadium ion concentration is that the concentration ratio of 1.2mol/L, V3+ and V4+ is 1:1, sulfate ion concentration is 3.6mol/L；
Electrolyte volume is 100ml.
The battery of comparative example 1 is by after 300 charge and discharge cycles experiments, its discharge capacity reduces by 50%, and the battery of embodiment 1 is by 300
Secondary charge and discharge cycles experiment, its discharge capacity reduction by 40%, compared to the capacity attenuation degree few 10% of comparative example, improves circulating battery process
In capacity attenuation.
Embodiment 2
A kind of all-vanadium flow battery, design parameter is with embodiment 1.
Anode electrolyte：Vanadium ion concentration is that the concentration ratio of 1.5mol/L, V3+ and V4+ is 1:1, sulfate ion concentration is 4.5mol/L；
Electrolyte volume is 80ml.
Electrolyte liquid：Vanadium ion concentration is that the concentration ratio of 1.1mol/L, V3+ and V4+ is 1:1, sulfate ion concentration is 3.27mol/L；
Electrolyte volume is 110ml.
Result shows that the battery of comparative example 1 is tested by 300 charge and discharge cycles, its discharge capacity reduction by 50%, and the battery of embodiment 2
Tested by 300 charge and discharge cycles, its discharge capacity reduction by 40%, compared to the capacity attenuation degree few 10% of comparative example, improve electricity
Capacity attenuation in the cyclic process of pond.
Claims (3)
1. a kind of all-vanadium flow battery, including anode electrolyte and electrolyte liquid, it is characterised in that：It is total in anode electrolyte and electrolyte liquid
Vanadium amount is identical, and vanadium ion concentration is 1.1~1.5 times of vanadium ion concentration in electrolyte liquid in anode electrolyte.
2. battery according to claim 1, it is characterised in that：Vanadium ion concentration is vanadium ion in electrolyte liquid in the anode electrolyte
1.2~1.3 times of concentration.
3. battery according to claim 1, it is characterised in that：The positive pole vanadium ion concentration is 1.4~1.7 mol/Ls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510923780.1A CN106876763A (en) | 2015-12-13 | 2015-12-13 | A kind of all-vanadium flow battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510923780.1A CN106876763A (en) | 2015-12-13 | 2015-12-13 | A kind of all-vanadium flow battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106876763A true CN106876763A (en) | 2017-06-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510923780.1A Pending CN106876763A (en) | 2015-12-13 | 2015-12-13 | A kind of all-vanadium flow battery |
Country Status (1)
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| CN (1) | CN106876763A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108091914A (en) * | 2018-01-30 | 2018-05-29 | 中国工程物理研究院电子工程研究所 | A kind of method for slowing down all-vanadium flow battery capacity attenuation and ion permeability test device |
-
2015
- 2015-12-13 CN CN201510923780.1A patent/CN106876763A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108091914A (en) * | 2018-01-30 | 2018-05-29 | 中国工程物理研究院电子工程研究所 | A kind of method for slowing down all-vanadium flow battery capacity attenuation and ion permeability test device |
| CN108091914B (en) * | 2018-01-30 | 2023-11-03 | 中国工程物理研究院电子工程研究所 | Method for slowing down capacity fade of all-vanadium redox flow battery and ion permeability testing device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170620 |