CN104617317A - Method for treating surface of bipolar plate for redox flow battery and bipolar plate obtainedthereby - Google Patents
Method for treating surface of bipolar plate for redox flow battery and bipolar plate obtainedthereby Download PDFInfo
- Publication number
- CN104617317A CN104617317A CN201510059091.0A CN201510059091A CN104617317A CN 104617317 A CN104617317 A CN 104617317A CN 201510059091 A CN201510059091 A CN 201510059091A CN 104617317 A CN104617317 A CN 104617317A
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- Prior art keywords
- bipolar plates
- bipolar plate
- carbon
- conducting
- graphite
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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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
-
- 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
-
- 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 discloses a method for treating the surface of a bipolar plate for a redox flow battery. According to the method, a conductor is attached to the surface of one side or the surfaces of two sides of the bipolar plate, wherein the conductor is a conducting powder body or a conducting solid; the conducting powder body is at least one of graphite powder and carbon powder; and the conducting solid is a graphite rod, a graphite sheet or a carbon rod. The bipolar plate obtained according to the method for treating the surfaces of the bipolar plate disclosed by the invention has the following advantages: (1) compared with the graphite plate, the bipolar plate has higher flexibility and better mechanical properties; (2) compared with the carbon-plastic composite plate, the bipolar plate has good conducting surfaces by forming a carbon powder layer with high conductivity on the surfaces so that many more conducting contacts can be provided to form a better conducting network to reduce surface contacted resistance when the bipolar plate are assembled with carbon felt electrodes to form the redox flow battery; and (3) the preparation process is simple, the cost is low, and the batch production is easy.
Description
Technical field
Of the present inventionly relate to flow battery technology field, particularly a kind of surface treatment method of flow battery bipolar plates and the bipolar plates that obtains thereof.
Background technology
Flow battery has power output because of it and capacity is separate, system is flexible, energy efficiency is high, life-span is long, can data, can deep discharge, that response is fast, addressing is flexible, cost is low etc. is excellent, be considered to the effective ways solving the renewable energy system randomness such as solar energy, wind energy and intermittent unstable state feature, be suitable for the energy storage of the intermittent energy such as wind-powered electricity generation, photovoltaic, from application scenarios such as net power supplies.
Bipolar plates in flow battery mainly plays series-connected cell, conduction electron, separation both positive and negative polarity electrolyte, needs to have good conductivity, liquid-proof, chemical stability and certain mechanical strength.The bipolar plate material mainly used at present is hard graphite cake and carbon plastic composite materials.Hard graphite cake has that conductivity is high, liquid-proof and the good feature of chemical stability, but high cost, bad mechanical property, limit its practical application.
Carbon plastic composite materials major advantage is with low cost, and processing is simple, is easy to realize large-scale production, is therefore subject to being extensively pay close attention to.But, this material conductivity is poor, especially due to the non-conductive polymer containing some, bipolar plate surfaces is made up of conductive particle and non-conductive polymer, when porous electrode is in contact with it, cannot conductive path be formed, thus cause the contact resistance of bipolar plates and electrode material larger, increase the ohmic internal resistance of battery, reduce battery performance.
In order to reduce the contact resistance of bipolar plates, disclose in CN 101009376A, bipolar plates and porous electrode are bonded together formation integrated pole dual-pole board by conductive bonding material, and namely integrated pole dual-pole board reduces the contact resistance between pole dual-pole board.But, because conductive bonding material is mixed by conductive filler and organic polymer, can not ensure that each contact point of porous electrode and bipolar plates can form conductive path, thus contact resistance cannot be reduced to greatest extent, therefore for the raising limitation of voltage efficiency and energy efficiency.
Summary of the invention
The application's the object of the invention is the surface treatment method providing a kind of flow battery bipolar plates, obtains the flow battery bipolar plates with low contact resistance.
In order to achieve the above object, technical scheme of the present invention is:
A surface treatment method for flow battery bipolar plates, is attached to bipolar plates one side surface or both side surface by electric conductor.
According to one embodiment of the invention, described electric conductor is conductive solids, and described attachment is formed by the surperficial extrusion friction of conductive solids in bipolar plates.
Preferably, described conductive solids is graphite rod, graphite flake or carbon-point.
The apparent density of described graphite rod, graphite flake be 0.001-0.025g/ml (apparent density refer to powder be freely full of volumetric standard under prescribed conditions after measured bulk density, the quality of unit volume when namely pulverulent bulk is loaded).
According to another embodiment of the invention, described electric conductor is conductive powder body, and described attachment is surface conductive powder body being coated in bipolar plates.
Preferably, described conductive powder body is at least one in graphite powder, carbon dust; Graphite powder is preferably expanded graphite powder or crystalline graphite powder.
Preferably, the method for above-mentioned either a program also comprises preliminary treatment, and described preliminary treatment is air-dry after first hydrophilic organic solvent being evenly applied to surface, bipolar plates one or both sides; Described hydrophilic organic solvent is at least one in ethanol, methyl alcohol, acetone etc.
The flow battery bipolar plates that the present invention also provides above all methods obtained.
Preferably, the thickness of described attachment is 1-2000 μm.The thickness more preferably 2-200 μm of attachment.
Preferably, the material of described bipolar plates is carbon plastic clad plate.
Preferably, the thickness of described bipolar plates is 0.2-5mm, is preferably 0.4-4mm, most preferably is 0.6-2mm.
Compared with prior art, the flow battery bipolar plates obtained through surface treatment method of the present invention has the following advantages:
(1) compared with graphite cake, there is higher pliability and good mechanical performance.
(2) compared with original carbon plastic clad plate, by forming the carbon dust layer of high connductivity on surface, bipolar plates is made to form good conductive surface, cause with carbon felt electrode assemble form flow battery time, more conductive contact point can be provided, form good conductive network, reduce bipolar plate surfaces contact resistance.
(3) preparation technology is simple, with low cost, is easy to batch production.
Accompanying drawing explanation
Accompanying drawing 2 width of the present invention,
Total contact resistance correlation curve before and after the process of accompanying drawing 1 bipolar plate surfaces;
Contact resistance correlation curve before and after the process of accompanying drawing 2 bipolar plate surfaces.
Embodiment
Following non-limiting example can make the present invention of those of ordinary skill in the art's comprehend, but does not limit the present invention in any way.
The carbon plastic clad plate that the present invention adopts is commercially available, and following methods also can be adopted to prepare:
Take polypropylene respectively, graphite powder, join in high speed agitator and stir.Then send in double screw extruder and carry out mixing and granulation, obtain conducting masterbatch, then send in extruder by conducting masterbatch, extrusion sheet calendering formation obtain.
Bipolar plate surfaces process method step is as follows:
(1) at bipolar plates one side surface or both sides, alcohol is evenly applied to surface, then air-dry;
(2) electric conductor is attached to bipolar plate surfaces, forms the bipolar plates being attached with conductive coating.
Embodiment 1
Get the thick carbon plastic clad plate of 1mm, with alcohol, carbon plastic clad plate both side surface is carried out wiping, air-dry.Graphite powder is coated in equably carbon plastic clad plate both sides, removes surperficial powder, form 50 μm of conductive coatings in carbon plastic clad plate both sides.
Utilize low resistance admeasuring apparatus to test total contact resistance and the contact resistance of the present embodiment 1 bipolar plates by voltammetry, contact resistance and bipolar plates upper and lower surface and carbon felt contact resistance and, total contact resistance is the summation of bipolar plates bulk resistance and contact resistance.Result shows, relative to the carbon plastic clad plate of non-face coat, total contact resistance of the present embodiment bipolar plates is from 208 Ω cm
2102 Ω cm are dropped to
2reduce 51%, contact resistance is from 138m Ω cm
2drop to 32m Ω cm
2, reduce 77%.
Embodiment 2
Get the thick carbon plastic clad plate of 1mm, with alcohol, carbon plastic clad plate both side surface is carried out wiping, air-dry.By the mantle friction of graphite rod at carbon plastic clad plate, be attached to carbon plastic clad plate both sides equably, remove surperficial powder, form 100 μm of conductive coatings in carbon plastic clad plate both sides.
Utilize low resistance admeasuring apparatus to test total contact resistance and the contact resistance of the present embodiment 2 bipolar plates by voltammetry, result shows, relative to the carbon plastic clad plate of non-face coat, total contact resistance of the present embodiment bipolar plates is from 220 Ω cm
2110 Ω cm are dropped to
2reduce 50%, contact resistance is from 156 Ω cm
2drop to 44m Ω cm
2, reduce 72%.
Embodiment 3
Get the thick carbon plastic clad plate of 1mm, with alcohol, carbon plastic clad plate both side surface is carried out wiping, air-dry.Crystalline graphite powder is coated in equably carbon plastic clad plate both sides, removes surperficial powder, form 50 μm of conductive coatings in carbon plastic clad plate both sides.
Utilize low resistance admeasuring apparatus to test total contact resistance and the contact resistance of the present embodiment 3 bipolar plates by voltammetry, result shows, relative to the carbon plastic clad plate of non-face coat, total contact resistance of the present embodiment bipolar plates is from 216 Ω cm
2114 Ω cm are dropped to
2reduce 47%, contact resistance is from 148 Ω cm
2drop to 38m Ω cm
2, reduce 74%.
Claims (10)
1. a surface treatment method for flow battery bipolar plates, is characterized in that, electric conductor is attached to bipolar plates one side surface or both side surface.
2. method according to claim 1, is characterized in that, described electric conductor is conductive solids, and described attachment is formed by the surperficial extrusion friction of conductive solids in bipolar plates.
3. method according to claim 2, is characterized in that: described conductive solids is graphite rod, graphite flake or carbon-point.
4. method according to claim 1, is characterized in that, described electric conductor is conductive powder body, and described attachment is surface conductive powder body being coated in bipolar plates.
5. method according to claim 4, is characterized in that, described conductive powder body is at least one in graphite powder, carbon dust.
6. the method according to claim 1-5 any one, is characterized in that, described method also comprises preliminary treatment, and described preliminary treatment is air-dry after first hydrophilic organic solvent being evenly applied to surface, bipolar plates one or both sides; Described hydrophilic organic solvent is at least one in ethanol, methyl alcohol, acetone.
7. the flow battery bipolar plates that method described in claim 1-6 any one is obtained.
8. bipolar plates according to claim 7, is characterized in that, the thickness of described attachment is 1-2000 μm.
9. the bipolar plates according to claim 7 or 8, is characterized in that, the material of described bipolar plates is carbon plastic clad plate.
10. bipolar plates according to claim 9, is characterized in that, the thickness of described bipolar plates is 0.2-5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510059091.0A CN104617317A (en) | 2015-02-04 | 2015-02-04 | Method for treating surface of bipolar plate for redox flow battery and bipolar plate obtainedthereby |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510059091.0A CN104617317A (en) | 2015-02-04 | 2015-02-04 | Method for treating surface of bipolar plate for redox flow battery and bipolar plate obtainedthereby |
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| CN104617317A true CN104617317A (en) | 2015-05-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108365224A (en) * | 2018-02-13 | 2018-08-03 | 青海百能汇通新能源科技有限公司 | The preparation method of pole plate and pole plate |
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| CN101877408A (en) * | 2009-04-30 | 2010-11-03 | 比亚迪股份有限公司 | Current collector of liquid flow battery and liquid flow battery |
| CN102468490A (en) * | 2010-11-19 | 2012-05-23 | 中国科学院金属研究所 | Surface chromium carbide/graphite composite coating for vanadium redox flow battery stainless steel bipolar plate |
| JP2012221775A (en) * | 2011-04-11 | 2012-11-12 | Sumitomo Electric Ind Ltd | Bipolar plate for redox flow battery and manufacturing method therefor |
| CN103633336A (en) * | 2012-08-29 | 2014-03-12 | 中国科学院大连化学物理研究所 | Bipolar plate for liquid flow energy storage battery and preparation method |
| KR20140046774A (en) * | 2012-10-11 | 2014-04-21 | 한국과학기술원 | Bipolar plate for redox flow battery and redox flow battery comprising said bipolar plate |
| CN203659987U (en) * | 2013-12-24 | 2014-06-18 | 北京百能汇通科技股份有限公司 | Corrugated bipolar plate for zinc-bromine flow battery |
| JP2014207122A (en) * | 2013-04-12 | 2014-10-30 | パナソニック株式会社 | Bipolar plate and process of manufacturing the same |
| CN104269564A (en) * | 2014-09-30 | 2015-01-07 | 成都赢创科技有限公司 | Preparation method of bipolar plate for all-vanadium redox flow battery |
-
2015
- 2015-02-04 CN CN201510059091.0A patent/CN104617317A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101877408A (en) * | 2009-04-30 | 2010-11-03 | 比亚迪股份有限公司 | Current collector of liquid flow battery and liquid flow battery |
| CN102468490A (en) * | 2010-11-19 | 2012-05-23 | 中国科学院金属研究所 | Surface chromium carbide/graphite composite coating for vanadium redox flow battery stainless steel bipolar plate |
| JP2012221775A (en) * | 2011-04-11 | 2012-11-12 | Sumitomo Electric Ind Ltd | Bipolar plate for redox flow battery and manufacturing method therefor |
| CN103633336A (en) * | 2012-08-29 | 2014-03-12 | 中国科学院大连化学物理研究所 | Bipolar plate for liquid flow energy storage battery and preparation method |
| KR20140046774A (en) * | 2012-10-11 | 2014-04-21 | 한국과학기술원 | Bipolar plate for redox flow battery and redox flow battery comprising said bipolar plate |
| JP2014207122A (en) * | 2013-04-12 | 2014-10-30 | パナソニック株式会社 | Bipolar plate and process of manufacturing the same |
| CN203659987U (en) * | 2013-12-24 | 2014-06-18 | 北京百能汇通科技股份有限公司 | Corrugated bipolar plate for zinc-bromine flow battery |
| CN104269564A (en) * | 2014-09-30 | 2015-01-07 | 成都赢创科技有限公司 | Preparation method of bipolar plate for all-vanadium redox flow battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108365224A (en) * | 2018-02-13 | 2018-08-03 | 青海百能汇通新能源科技有限公司 | The preparation method of pole plate and pole plate |
| CN108365224B (en) * | 2018-02-13 | 2021-03-19 | 青海百能汇通新能源科技有限公司 | Polar plate and preparation method thereof |
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Application publication date: 20150513 |