CN109860658B - Method for recovering performance of zinc-bromine single flow battery - Google Patents
Method for recovering performance of zinc-bromine single flow battery Download PDFInfo
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- CN109860658B CN109860658B CN201711213349.3A CN201711213349A CN109860658B CN 109860658 B CN109860658 B CN 109860658B CN 201711213349 A CN201711213349 A CN 201711213349A CN 109860658 B CN109860658 B CN 109860658B
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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
Abstract
The invention relates to a method for recovering the performance of a zinc-bromine single flow battery, wherein a positive electrode cavity of the battery is filled with positive electrolyte, negative electrolyte stored in a negative electrode storage tank circularly flows between the negative electrode storage tank and a negative electrode cavity of the battery through a pipeline, after the battery runs for a period of time, the positive electrolyte in the positive electrode cavity is introduced into the negative electrode storage tank to be mixed with the negative electrolyte, then part of mixed liquid is filled into the positive electrode cavity again, and the performance of the battery is recovered through the mutual mixing of the positive electrolyte and the negative electrolyte. The invention provides a method for recovering the performance of a zinc-bromine flow battery when the performance of the zinc-bromine flow battery is attenuated, which solves the problem of efficiency attenuation in the operation process of the zinc-bromine flow battery and prolongs the service life of the battery.
Description
Technical Field
The invention relates to an application of a battery performance recovery method in a zinc-bromine flow battery.
Background
Renewable energy sources such as wind energy, solar energy and the like have the characteristics of discontinuity and instability, and the characteristics can cause impact on a power grid in the grid connection process, so that the safe and stable operation of the power grid is influenced. The energy storage technology can ensure the efficient and stable operation of renewable energy power generation grid connection. Energy storage technologies are mainly classified into two categories, physical energy storage and chemical energy storage. Redox flow batteries suitable for large-scale, high-capacity energy storage in chemical energy storage have received much attention because of their advantages of independent battery power and capacity, rapid response, simple structure, and easy design. The zinc-bromine flow battery, as one of the redox flow batteries, has the advantages of high open-circuit voltage (1.85V), high theoretical energy density (435Wh/Kg), low price of electrolyte and diaphragm, and the like besides the advantages. These advantages also make it more competitive with other flow batteries. The zinc-bromine flow battery has the problem of accumulation of negative zinc in the charging and discharging operation process, the battery performance is attenuated due to the fact that the polarization of the battery is increased due to the accumulation of the zinc, the service life of the battery is influenced, and even dendritic crystals can be formed under severe conditions to cause short circuit failure of the battery. Therefore, the problem of accumulation of zinc in the negative electrode is solved, and the method plays an important role in prolonging the service life of the battery and ensuring the stable operation of the battery.
The invention content is as follows:
the invention aims to solve the problems and provides a method for recovering the performance of a zinc-bromine flow battery, which is used for recovering the performance of the battery and prolonging the service life of the battery under the condition of the performance attenuation of the battery by mixing positive and negative electrolytes to directly react accumulated zinc and bromine to generate zinc bromide.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for restoring the performance of Zn-Br single-flow battery features that the positive electrode electrolyte is filled in the positive cavity of said battery, the negative electrode electrolyte stored in negative electrode storage tank flows cyclically between negative electrode storage tank and negative electrode cavity of said battery, and after the battery is operated for a certain time, the positive electrode electrolyte in positive electrode cavity is introduced to negative electrode storage tank to mix with it, and part of the mixture is filled in positive electrode cavity again.
After the battery runs for a period of time, when the energy efficiency of the battery is attenuated by 5-10%, the positive electrolyte and the negative electrolyte are mixed.
After the battery runs for a period of time, the anode cavity is communicated with the cathode storage tank through a pipeline, so that electrolyte in the cathode storage tank circularly flows between the cathode storage tank and the anode cavity of the battery, the performance of the battery is recovered by mixing the anode electrolyte and the cathode electrolyte, and the open-circuit voltage of the battery is reduced to 0V under the condition of mutual mixing cut-off.
The same electrolyte with the same composition is used as the positive electrolyte and the negative electrolyte of the zinc-bromine flow battery.
The beneficial results of the invention are as follows:
the invention provides a method for recovering the performance of a zinc-bromine flow battery when the performance of the zinc-bromine flow battery is attenuated, which solves the problem of efficiency attenuation in the operation process of the zinc-bromine flow battery and prolongs the service life of the battery.
Drawings
FIG. 1 shows the operation of the hybrid battery with electrolyte during the operation
FIG. 2 shows the operation of a battery without an electrolyte mixture during the operation
Detailed Description
The following examples are further illustrative of the present invention and are not intended to limit the scope of the present invention.
Example 1
With 2MZnBr2The circulation performance experiment of the zinc-bromine flow battery is carried out by taking +3MKCl +0.4MMEP as electrolyte, the electrode is carbon felt, the flow rate of the electrolyte is 60ml/min, and the current density is 40mA/cm2. And mixing the electrolytes when the energy efficiency of the battery is reduced. The experimental result shows that the battery runs for 220 cycles, the energy efficiency of the battery is attenuated by 8%, the electrolytes of the positive electrode and the negative electrode are mixed until the open circuit voltage of the battery is 0V, the battery is continuously charged and discharged, and the performance of the battery is recovered to the initial level.
Comparative example
With 2MZnBr2The circulation performance experiment of the zinc-bromine flow battery is carried out by taking +3MKCl +0.4MMEP as electrolyte, the electrode is carbon felt, the flow rate of the electrolyte is 60ml/min, and the current density is 40mA/cm2. The electrolyte intermixing is not performed when the energy efficiency of the battery decays. As a result of experiments, it was found that the deterioration of the energy efficiency of the battery was gradually increased as the number of cycles was increased without the intermixing of the electrolytes.
Claims (1)
1. A zinc bromine single flow battery performance recovery method, the positive pole cavity of the battery is filled with the positive electrolyte, the negative electrolyte stored in the negative pole storage tank flows between the negative pole storage tank and the negative pole cavity of the battery through the pipeline, its characteristic is:
after the battery operates for a period of time, when the energy efficiency of the battery is attenuated by 5% -10%, introducing the positive electrolyte in the positive cavity into the negative storage tank to be mixed with the negative electrolyte, then filling part of the mixed solution into the positive cavity again, and enabling the performance of the battery to be recovered through the mutual mixing of the positive electrolyte and the negative electrolyte; the mutual mixing cut-off condition is that the open-circuit voltage of the battery is reduced to 0V;
during mixing, the anode chamber is communicated with the cathode storage tank through a pipeline, so that the electrolyte in the cathode storage tank circularly flows between the cathode storage tank and the anode chamber of the battery;
electrolyte with the same composition is used as the positive electrolyte and the negative electrolyte of the zinc-bromine flow battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711213349.3A CN109860658B (en) | 2017-11-28 | 2017-11-28 | Method for recovering performance of zinc-bromine single flow battery |
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| CN201711213349.3A CN109860658B (en) | 2017-11-28 | 2017-11-28 | Method for recovering performance of zinc-bromine single flow battery |
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| CN109860658A CN109860658A (en) | 2019-06-07 |
| CN109860658B true CN109860658B (en) | 2022-02-22 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113067025B (en) * | 2020-01-02 | 2022-04-29 | 中国科学院大连化学物理研究所 | Online recovery method for electrolyte of alkaline zinc-iron flow battery |
| CN114551935B (en) * | 2020-11-25 | 2023-09-15 | 中国科学院大连化学物理研究所 | Performance recovery method of zinc-bromine single flow battery |
| CN114551915B (en) * | 2020-11-25 | 2023-10-03 | 中国科学院大连化学物理研究所 | Zinc-bromine single flow battery operation strategy |
| CN114597455A (en) * | 2020-12-03 | 2022-06-07 | 中国科学院大连化学物理研究所 | Discharging operation method of zinc-bromine single flow battery and intermittent discharging zinc-bromine single flow battery |
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| CN101619465A (en) * | 2008-07-02 | 2010-01-06 | 中国科学院大连化学物理研究所 | Method for preparing vanadium battery solution or adjusting capacity and special device thereof |
| CN102780018A (en) * | 2012-08-13 | 2012-11-14 | 北京百能汇通科技股份有限公司 | Integrated liquid storage pot and novel zinc-bromine redox flow battery |
| CN103762377A (en) * | 2014-01-27 | 2014-04-30 | 中国东方电气集团有限公司 | Vanadium redox battery and electrolyte rebalancing method thereof |
| CN104143646A (en) * | 2013-05-09 | 2014-11-12 | 中国科学院大连化学物理研究所 | Flow energy storage cell or pile running method |
| CN105680082A (en) * | 2014-11-17 | 2016-06-15 | 中国科学院大连化学物理研究所 | Long-lifetime zinc-bromine flow battery structure and electrolyte |
| WO2016099217A1 (en) * | 2014-12-18 | 2016-06-23 | 주식회사 엘지화학 | Module for regenerating electrolyte of flow battery and method for regenerating electrolyte of flow battery by using same |
| CN206022528U (en) * | 2016-09-21 | 2017-03-15 | 中国科学院大连化学物理研究所 | A kind of zinc bromine single flow battery structure |
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2017
- 2017-11-28 CN CN201711213349.3A patent/CN109860658B/en active Active
Patent Citations (7)
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| CN101619465A (en) * | 2008-07-02 | 2010-01-06 | 中国科学院大连化学物理研究所 | Method for preparing vanadium battery solution or adjusting capacity and special device thereof |
| CN102780018A (en) * | 2012-08-13 | 2012-11-14 | 北京百能汇通科技股份有限公司 | Integrated liquid storage pot and novel zinc-bromine redox flow battery |
| CN104143646A (en) * | 2013-05-09 | 2014-11-12 | 中国科学院大连化学物理研究所 | Flow energy storage cell or pile running method |
| CN103762377A (en) * | 2014-01-27 | 2014-04-30 | 中国东方电气集团有限公司 | Vanadium redox battery and electrolyte rebalancing method thereof |
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