CN115295808A - Composite bipolar plate material and preparation method and application thereof - Google Patents

Composite bipolar plate material and preparation method and application thereof Download PDF

Info

Publication number
CN115295808A
CN115295808A CN202210956710.6A CN202210956710A CN115295808A CN 115295808 A CN115295808 A CN 115295808A CN 202210956710 A CN202210956710 A CN 202210956710A CN 115295808 A CN115295808 A CN 115295808A
Authority
CN
China
Prior art keywords
bipolar plate
plate material
composite bipolar
flexible graphite
graphite paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210956710.6A
Other languages
Chinese (zh)
Inventor
李全龙
张雅薇
鲁志颖
石振家
王世宇
江杉
宋清爽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dalian Rongke Power Co Ltd
Original Assignee
Dalian Rongke Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dalian Rongke Power Co Ltd filed Critical Dalian Rongke Power Co Ltd
Priority to CN202210956710.6A priority Critical patent/CN115295808A/en
Publication of CN115295808A publication Critical patent/CN115295808A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/8647—Inert electrodes with catalytic activity, e.g. for fuel cells consisting of more than one material, e.g. consisting of composites
    • H01M4/8657—Inert electrodes with catalytic activity, e.g. for fuel cells consisting of more than one material, e.g. consisting of composites layered
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8875—Methods for shaping the electrode into free-standing bodies, like sheets, films or grids, e.g. moulding, hot-pressing, casting without support, extrusion without support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8878—Treatment steps after deposition of the catalytic active composition or after shaping of the electrode being free-standing body
    • H01M4/8896—Pressing, rolling, calendering
    • 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 relates to the technical field of bipolar plate materials of flow batteries, and discloses a composite bipolar plate material, a preparation method and application thereof, which are suitable for bipolar plate materials of flow batteries. The flexible graphite paper, the fluorine-containing polymer resin powder and the chopped carbon fibers are used as raw materials, and are subjected to multiple-time stacking and paving, then are subjected to normal-temperature pre-rolling, and finally are subjected to hot-die pressing to prepare and mold. The prepared composite bipolar plate material has the performances of higher conductivity, difficult layering, good mechanical property, higher vanadium battery efficiency and the like, can replace the existing bipolar plate to be applied to the vanadium battery energy storage field, has wide raw material sources and is relatively cheap, and is suitable for large-scale industrial production.

Description

Composite bipolar plate material and preparation method and application thereof
Technical Field
The invention relates to the technical field of bipolar plate materials of flow batteries, in particular to a composite bipolar plate material and a preparation method and application thereof.
Background
The basic structure of the all-vanadium redox flow battery comprises core key materials such as a bipolar plate, an electrode, an ion exchange membrane and the like, and auxiliary components such as a sealing structure, an electrode frame and the like, wherein the bipolar plate has the functions of transferring electrons and separating positive and negative electrolytes. The bipolar plate is required to have high conductivity, good resistance to electrolyte corrosion, particularly to mixed acid (hydrochloric acid + sulfuric acid) electrolyte corrosion, and high mechanical strength, and is generally prepared by mixing a high molecular material with a carbon material (such as carbon black, graphite, etc.). The patent CN107046140A improves the conductivity of the bipolar plate by adding graphite worms into a polymer material; the patent CN106299389A improves the conductivity of the bipolar plate by introducing the nickel net surface grafting carbon nano-tube into the bipolar plate. However, a series of experiments have proved that a bipolar plate using a non-fluorine type polymer resin material as a base material is difficult to operate for a long time in a mixed acid electrolyte system, and performance may be deteriorated in long-term use.
Patent CN 107819136A discloses a structure using a modified resin film added between flexible graphite paper layers, which improves the liquid resistance of a bipolar plate to a certain extent, but because the modified resin film between the flexible graphite paper layers is not an electronic conductor, the longitudinal conductivity of the bipolar plate is relatively low, and the film is difficult to permeate into the flexible graphite paper layers in the mould pressing process to form a permeable layer, so that the lamination phenomenon of the bipolar plate is obvious.
Therefore, the development of a composite bipolar plate for a flow battery, which has high conductivity, is not easy to delaminate, is resistant to mixed acid electrolyte corrosion and has high mechanical strength, is the research direction of researchers in the field.
Disclosure of Invention
The invention provides a composite bipolar plate material, a preparation method and application thereof, in order to develop a composite bipolar plate for a flow battery, which has high conductivity, is not easy to delaminate, resists mixed acid electrolyte corrosion and has higher mechanical strength.
The technical scheme of the invention is as follows:
a composite bipolar plate material is formed by alternately laying flexible graphite paper, fluorine-containing polymer resin powder, chopped carbon fibers and the flexible graphite paper for multiple times, then carrying out normal-temperature pre-rolling, and finally carrying out hot-die pressing to prepare and form the composite bipolar plate material, wherein a resin permeable layer is formed between the adjacent flexible graphite paper layer and the fluorine-containing polymer resin powder and chopped carbon fibers.
It should be noted that the fluorine atom in the fluorine-containing polymer resin powder has strong electronegativity, and can form a stable covalent bond structure with a carbon atom, and is not easily broken, so that the fluorine-containing polymer resin powder has strong corrosion resistance, and can stably exist in the mixed acid electrolyte.
Preferably, the thickness of the flexible graphite paper is 0.1-0.3mm.
Preferably, the fluoropolymer resin powder used is any one of PVF, PVDF and PTFE, and the maximum particle diameter thereof is not more than 30nm. The particle size of the fluorine-containing polymer resin powder is less than 30nm, which is beneficial to uniformly dispersing the powder and improving the uniformity.
Preferably, the chopped carbon fibers used have a fiber length in the range of 0.5 to 3mm. The short carbon fibers have the effects that on the basis of ensuring that the double-layer flexible graphite paper is easy to uniformly pave, more fiber sections can be obtained under the same paving quality condition, more longitudinal fibers can be ensured in the paving process, bridging through of two adjacent layers of flexible graphite paper is facilitated, a conductive path is formed, and the conductivity of the bipolar plate is facilitated to be improved. The use of the overlong carbon fibers is not beneficial to uniform dispersion of pavement, and the carbon fibers are easier to be oriented into transverse fibers in the following die pressing process, so that the better conductive effect is difficult to achieve, and the carbon fibers with the diameter less than 0.5mm and too short carbon fibers are difficult to form a bridging structure and have poorer conductive performance.
Preferably, the density of the composite bipolar plate material is more than or equal to 1.70g/cm 3 Higher density can makeThe obtained bipolar plate is more compact, and is beneficial to improving the liquid resistance and the conductivity.
The preparation method of the composite bipolar plate material comprises the following steps:
(1) Uniformly paving fluorine-containing polymer resin powder and chopped carbon fibers on the first layer of flexible graphite paper, covering the second layer of flexible graphite paper, continuously and uniformly paving fluorine-containing polymer resin powder and chopped carbon fibers on the second layer of flexible graphite paper, covering the third layer of flexible graphite paper, repeating the steps repeatedly in this way for many times, and covering the last layer of flexible graphite paper to obtain a structure A;
(2) Pre-rolling the structure A under a steel roller under a certain pressure to obtain a structure B;
(3) And (3) placing the structure B in a flat plate die for hot die pressing and molding to obtain the composite bipolar plate material.
Preferably, the amount of the fluoropolymer resin powder applied in step (1) is 20 to 30g/m 2 The laying amount of the short carbon fiber is 5-15g/m each time 2 . The paving times of the step (1) are determined by the thickness of the bipolar plate to be finally obtained, and the corresponding relation between the target thickness of the final bipolar plate and the paving times is determined by accumulating experience through multiple experiments. For this, the thickness of the bipolar plate is preferably 0.7 to 1.0mm, and the number of layers is 5 to 9. Too few or less thickness of the number of layers can influence the liquid resistance of the bipolar plate, too many or too large number of layers can cause the uniformity of the thickness of the bipolar plate to be poor, the process becomes more complicated, the consumption of raw materials is increased, and the cost is increased.
Preferably, the pressure of the pre-rolling of the steel roller in the step (2) is more than or equal to 10MPa;
the temperature and pressure for hot-press molding in step (3) are determined by the melting point of the selected fluorine-containing polymer resin material, generally 10-30 ℃ above the melting point of the polymer resin, and the hot-press molding temperature and pressure are generally greater than the pressure of pre-rolling of the steel roller, which is not limited herein.
The third purpose of the invention is to protect the application of the composite bipolar plate material in vanadium battery energy storage.
Compared with the prior art, the invention has the following beneficial effects:
the invention uses flexible graphite paper, fluorine-containing polymer resin powder and short carbon fiber as raw materials, and the flexible graphite paper, the fluorine-containing polymer resin powder and the short carbon fiber are laminated and paved for many times, then are pre-rolled at normal temperature, and finally are prepared and molded in a hot die pressing mode.
(1) The invention provides a composite bipolar plate material and a preparation method thereof, the raw material source is wide and relatively cheap, no solvent is used in the preparation process, and the composite bipolar plate material is suitable for large-scale industrial production;
(2) The composite bipolar plate material prepared by the invention has the performances of high conductivity, difficult layering, mixed acid electrolyte corrosion resistance, higher mechanical strength and the like, and can replace the existing bipolar plate material to be applied to the field of vanadium battery energy storage.
Compared with patent CN 107819136A, the application has the following advantages:
(1) Resin powder is used instead of the resin film.
(1) The use of resin powder has higher conductivity: compared with resin powder, the resin film is more compact, the resin film is not an electronic conductor and has no conductivity, the use of the compact resin film hinders the conductive connection between two adjacent layers of flexible graphite paper to a certain extent, and the problem cannot be improved even if the surface of the resin film is coated with modified slurry.
(2) The resin powder is more beneficial to melting and permeating the flexible graphite paper layer to form a resin permeation layer, so that the bonding force between layers is increased, and the occurrence of the lamination phenomenon of the bipolar plate is reduced.
(2) The bipolar plate avoids the use of a solvent in the preparation process, reduces the processes of preparing slurry and removing the solvent, and has simpler preparation process.
(3) The fluorine-containing resin used in the invention has excellent mixed acid corrosion resistance, and the non-fluorine resin is mainly used in the comparison document, so that the mixed acid resistance is poor.
Drawings
FIG. 1 is a schematic diagram of a bipolar plate material of the present invention.
In the figure: 1. flexible graphite paper; 2. fluorine-containing polymer resin powder; 3. short-cut carbon fibers; 4. and (4) resin permeating layers.
Detailed Description
In order to better understand the invention, the following embodiments further illustrate the content of the invention, but the content of the invention is not limited to the following embodiments. One composite bipolar plate material and the method of making the same according to the present invention is described in more detail in the following examples, which are given by way of illustration and are not intended to limit the scope of the invention. Unless otherwise specified, the experimental method adopted by the invention is a conventional method, and experimental equipment, materials, reagents and the like used in the method can be purchased from chemical companies.
The thickness of the bipolar plates prepared in the examples and the comparative examples is tested by a digital micrometer;
the tensile strength of the bipolar plate prepared in the embodiment and the comparative example is determined by referring to a bipolar plate test method for an all-vanadium redox flow battery of the energy industry standard NB/T42007-2013 of the people's republic of China, a rectangular material of 70mm multiplied by 10mm is cut out of the bipolar plate to be used as a sample, the initial gauge length of the sample is 50mm, and the sample is stretched at the speed of 2mm/min for testing;
the electrical conductivity of the bipolar plates prepared in examples and comparative examples was measured by using a dual electrical measurement four-probe resistivity tester;
the all-vanadium redox flow battery performance test conditions of the bipolar plate are as follows: copper plate was used as a current collecting plate, and the current density was 80mA/cm 2 Performing charge-discharge experiment under the condition of charging to 1.55V and discharging to 1.00V, using graphite carbon felt produced by Liaoyang gold grain carbon materials GmbH as reaction electrode, wherein the effective working area of the electrode is 48cm 2 Nafion 212 perfluorosulfonic acid ion exchange membrane of DuPont is used as a battery diaphragm, and positive and negative electrolytes are VO respectively 2+ /VO 2 + And V 2+ /V 3+ The working temperature of the battery is 37 ℃.
Example 1
Using a thickness of 0.1mmThe flexible graphite paper contains PVDF as fluorine-containing polymer resin powder, has an average particle diameter of 25nm and a layup amount of 20g/m 2 The length of the short carbon fiber is 0.5mm, and the laying amount is 5g/m 2 . The preparation steps are as follows:
(1) On a flexible graphite paper with a thickness of 0.1mm according to a ratio of 20g/m 2 The PVDF powder is paved according to the amount of 5g/m 2 Paving the chopped carbon fibers with the length of 0.5mm, covering a second layer of flexible graphite paper, continuously paving, and circulating the steps, wherein the last layer is a 9 th layer of flexible graphite paper;
(2) Pre-rolling the mixture under 11 MPa;
(3) Placing into a flat plate mold, hot-molding at 195 deg.C (melting point of PVDF is about 170 deg.C) to obtain a sheet with a thickness of 0.84mm and a density of 1.72g/cm 3 The composite bipolar plate of (1).
It is worth noting here that flexible graphite papers having a thickness of 0.1mm and above generally have densities of less than 1.3g/cm 3 Therefore, in the process of high-pressure die pressing, the thickness of the graphite paper can be thinned to a certain degree, the density of the graphite paper can be improved, and due to the addition of resin, the melted resin partially permeates into the flexible graphite paper, and the thinned thickness of the graphite paper can be kept to a certain degree after cooling and solidification. This is why 9 layers of 0.1mm thick flexible graphite paper and other raw materials in this example are subjected to rolling and high temperature embossing processes to obtain a bipolar plate having a thickness of only 0.84 mm. The following examples and comparative examples are the same and will not be described in detail.
Example 2
Using 0.19mm flexible graphite paper, the last layer is the 5 th layer in the paving process, the other parameter steps are kept the same as the example 1, and the prepared flexible graphite paper has the thickness of 0.86mm and the density of 1.70g/cm 3 The composite bipolar plate of (1).
Example 3
The paving amount of each PVDF layer is 25g/m 2 The other parameter steps are kept the same as example 1, and the prepared thickness is 0.87mm, and the density is 1.72g/cm 3 The composite bipolar plate of (1).
Example 4
The paving amount of each PVDF layer is 30g/m 2 The other parameter steps are kept the same as example 1, and the prepared thickness is 0.89mm, and the density is 1.74g/cm 3 The composite bipolar plate of (1).
Example 5
The paving amount of each layer of chopped carbon fibers is 10g/m 2 The other parameter steps are kept the same as example 1, and the prepared thickness is 0.82mm, and the density is 1.72g/cm 3 The composite bipolar plate of (1).
Example 6
The paving amount of each layer of chopped carbon fibers is 15g/m 2 The other parameter steps are kept the same as example 1, and the prepared thickness is 0.83mm, and the density is 1.72/cm 3 The composite bipolar plate of (1).
Example 7
Replacing PVDF with PVF, with an average particle size of 22nm, chopped carbon fiber length of 1.9mm, pre-rolling pressure of 10.4MPa, hot-molding temperature of 210 ℃ (PVF melting point of 190-200 ℃), and other parameters consistent with those of example 1, and preparing the PVF with thickness of 0.83mm and density of 1.70g/cm 3 The composite bipolar plate of (1).
Example 8
Replacing PVDF with PTFE with an average particle size of 26nm, a pre-rolling pressure of 11.6MPa, a chopped carbon fiber length of 3.0mm, a hot-molding temperature of 349 ℃ (PTFE melting point of 327 ℃), and other parameter steps are the same as those in example 1, and the prepared carbon fiber has a thickness of 0.85mm and a density of 1.77g/cm 3 The composite bipolar plate of (1).
Comparative example 1
The PVDF powder was removed from the pavement and the other conditions were the same as in example 1, to obtain a plate having a thickness of 0.95mm and a density of 1.52g/cm 3 The bipolar plate material of (1).
Comparative example 2
The chopped carbon fibers are not paved, the other conditions are the same as the conditions of the example 1, and the prepared carbon fiber has the thickness of 0.79mm and the density of 1.78g/cm 3 The bipolar plate material of (1).
Comparative example 3
The length of the chopped carbon fiber was changed to 4.5mm, and the thickness of the chopped carbon fiber was 0.81mm and the density thereof was 1.69g/cm under the same conditions as in example 1 3 The bipolar plate material of (1).
Comparative example 4
The length of the chopped carbon fiber was changed to 6.8mm, and the thickness of the carbon fiber was 0.76mm and the density of the carbon fiber was 1.68g/cm under the same conditions as in example 1 3 The bipolar plate material of (1).
Comparative example 5
The length of the chopped carbon fiber was changed to 0.3mm, and the thickness of the chopped carbon fiber was 0.80mm and the density thereof was 1.71g/cm under the same conditions as in example 1 3 The bipolar plate material of (1).
Table 1 performance data for bipolar plates prepared in examples 1-8 and comparative examples 1-5, and for commercial bipolar plate SGLPV15
Numbering Density (g/cm) 3 ) Conductivity (S/cm) Tensile Strength (MPa) Initial Voltage efficiency (%)
Example 1 1.72 401 40.6 92.6
Example 2 1.70 396 38.5 92.4
Example 3 1.72 384 41.3 92.0
Example 4 1.74 362 44.0 91.5
Example 5 1.72 423 46.0 92.9
Example 6 1.72 441 48.2 93.3
Example 7 1.70 398 39.2 92.6
Example 8 1.77 406 36.8 92.7
Comparative example 1 1.52 230 16.8 90.1
Comparative example 2 1.78 294 29.6 90.6
Comparative example 3 1.69 321 42.1 91.0
Comparative example 4 1.68 299 42.0 90.8
Comparative example 5 1.71 301 31.0 90.5
SGLPV15 1.71 352 33.8 91.2
As can be seen from table 1, the bipolar plate prepared by the method of the present invention has high conductivity and mechanical strength, and thus has high voltage efficiency. From the examples 1,3 and 4, it can be seen that the addition of the fluoropolymer resin increases the strength of the bipolar plate, but also reduces the electrical conductivity of the bipolar plate; as can be seen from examples 1,5 and 6, the increase in chopped carbon fibers increases the electrical conductivity and mechanical strength of the bipolar plate; as can be seen from example 1 and comparative example 1, the fluoropolymer resin can increase the density and conductivity of the bipolar plate, because the flexible graphite paper and the carbon fiber have no better "bonding" medium, the density of the bipolar plate cannot be increased, and the mechanical strength is greatly reduced without adding the fluoropolymer resin. From example 1 and comparative example 2, it can be seen that the carbon fiber can improve the tensile strength and electrical conductivity of the bipolar plate, which indicates that the addition of the carbon fiber can bridge each component inside the bipolar plate, increase the conductive path of the bipolar plate, and improve the strength of the bipolar plate itself. It can be seen from example 1 and comparative examples 3 and 4 that, when the length of the carbon fiber is beyond the range of 0.5-3mm defined in the present invention, the conductivity of the bipolar plate is greatly reduced although the mechanical strength of the bipolar plate is improved by the overlong carbon fiber, because the longer carbon fiber causes fewer conductive paths to be formed between adjacent flexible graphite papers, thereby affecting the radial conductivity of the plate. As can be seen from example 1 and comparative example 5, too short a carbon fiber causes a decrease in both the electrical conductivity and mechanical properties of the bipolar plate. The carbon fiber length therefore plays a significant role in the performance of the bipolar plate.
In addition, in the test of the mixed acid single cell, the voltage efficiency attenuation value of the 2000-cycle single cell of the bipolar plates prepared in the examples 1 to 8 and the comparative example 2 does not exceed 1 percent, and the bipolar plate is proved to have excellent mixed acid electrolyte resistance and to be suitable for being used in the mixed acid electrolyte. Comparative example 1 in the single cell test, since the bipolar plate does not contain a polymer resin material, the density of the bipolar plate is low, the liquid resistance is not good, and the electrolyte leaks through the bipolar plate and is not suitable for use.
In practical production application, the preparation process of the final bipolar plate needs to be comprehensively considered by considering the factors such as raw material cost, energy consumption, difficulty and easiness of processing process and the like, so that the highest cost performance requirement is achieved.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A composite bipolar plate material is characterized in that flexible graphite paper (1), fluorine-containing polymer resin powder (2), chopped carbon fibers (3) and the flexible graphite paper (1) are sequentially laminated and paved for a plurality of times in an alternating mode, then normal-temperature pre-rolling is carried out, finally, the composite bipolar plate material is prepared and molded in a hot die pressing mode, and resin permeable layers (4) are formed among adjacent layers of the flexible graphite paper (1), the fluorine-containing polymer resin powder (2) and the chopped carbon fibers (3).
2. A composite bipolar plate material according to claim 1, characterised in that the flexible graphite paper (1) has a thickness of 0.1-0.3mm.
3. A composite bipolar plate material according to claim 1, wherein said fluorine-containing polymer resin powder (2) is any one of PVF, PVDF and PTFE, and has a maximum particle size of 30nm or less.
4. A composite bipolar plate material according to claim 1, characterised in that chopped carbon fibres (3) are used having a fibre length in the range of 0.5-3mm.
5. A composite bipolar plate material according to claim 1, wherein said composite bipolar plate has a density of 1.70g/cm or more 3 The thickness is 0.7-1.0mm, and the number of paving layers of the flexible graphite paper (1) is 5-9.
6. A method for preparing a composite bipolar plate material is characterized by comprising the following steps:
s1, uniformly paving fluorine-containing polymer resin powder (2) and chopped carbon fibers (3) on a first layer of flexible graphite paper (1), covering a second layer of flexible graphite paper (1), continuously and uniformly paving the fluorine-containing polymer resin powder (2) and the chopped carbon fibers (3) on the second layer of flexible graphite paper (1), covering a third layer of flexible graphite paper (1), repeating the steps for a plurality of times in a circulating manner, and covering the last layer of flexible graphite paper (1) to obtain a structure A;
s2, pre-rolling the structure A by a steel roller under a certain pressure to obtain a structure B;
and S3, placing the structure B in a flat plate die for hot die pressing and forming to obtain the composite bipolar plate material.
7. The method for producing a composite bipolar plate material according to claim 6, wherein the amount of the fluoropolymer resin powder (2) laid in step S1 is 20 to 30g/m per one time 2 The laying amount of the short carbon fiber (3) is 5-15g/m each time 2 。
8. The method for preparing a composite bipolar plate material according to claim 6, wherein the pre-rolling pressure of the steel roller in the step S2 is not less than 10MPa.
9. The method for manufacturing a composite bipolar plate material according to claim 6, wherein the temperature for hot press molding in step S3 is 10-30 ℃ above the melting point of the fluoropolymer resin powder (2), and the pressure is higher than the pressure for pre-rolling with the steel roller in step S2.
10. The application of the composite bipolar plate material is characterized in that the composite bipolar plate material is applied to energy storage of vanadium batteries.
CN202210956710.6A 2022-08-10 2022-08-10 Composite bipolar plate material and preparation method and application thereof Pending CN115295808A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210956710.6A CN115295808A (en) 2022-08-10 2022-08-10 Composite bipolar plate material and preparation method and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210956710.6A CN115295808A (en) 2022-08-10 2022-08-10 Composite bipolar plate material and preparation method and application thereof

Publications (1)

Publication Number Publication Date
CN115295808A true CN115295808A (en) 2022-11-04

Family

ID=83827857

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210956710.6A Pending CN115295808A (en) 2022-08-10 2022-08-10 Composite bipolar plate material and preparation method and application thereof

Country Status (1)

Country Link
CN (1) CN115295808A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117199420A (en) * 2023-11-06 2023-12-08 中国机械总院集团北京机电研究所有限公司 Graphite composite bipolar plate of flow battery and preparation method and device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117199420A (en) * 2023-11-06 2023-12-08 中国机械总院集团北京机电研究所有限公司 Graphite composite bipolar plate of flow battery and preparation method and device

Similar Documents

Publication Publication Date Title
EP3640014B1 (en) Reinforced membrane for separation in battery and preparation method therefor
Kim et al. Development of carbon composite bipolar plate (BP) for vanadium redox flow battery (VRFB)
CA2654921C (en) Porous membrane for fuel cell electrolyte membrane and method for manufacturing the same
EP2017912A1 (en) Separator for fuel cell and process for producing the same
US9257706B2 (en) Composite separator for polymer electrolyte membrane fuel cell and method for manufacturing the same
CN101771155B (en) Gas diffusion layer for proton exchange membrane fuel cells and preparation method thereof
KR101483282B1 (en) Method for manufacturing graphite coated composite bipolar plate of cell
CN108511764B (en) Composite conductive plate and preparation method and application thereof
US20090269671A1 (en) Fuel cell separator and method for manufacturing the same
CN113555578A (en) Composite graphite material for fuel cell bipolar plate and preparation method thereof
CN115295808A (en) Composite bipolar plate material and preparation method and application thereof
US20130320583A1 (en) Diffusion Media and Method of Preparation
CN114628714B (en) Composite bipolar plate and preparation process thereof
CN102738490B (en) For the wet side paper of fuel cell humidifier
US20090130534A1 (en) Separator for fuel cell and process for producing the same
CN112687906B (en) Multi-layer composite bipolar plate with flow channels, production method and application thereof
US20080220154A1 (en) Method of forming fluid flow field plates for electrochemical devices
CN111082069B (en) Implanted gradient composite electrode, production method and application thereof
CN111463447B (en) Laminated unipolar plate, preparation method thereof, laminated bipolar plate comprising laminated unipolar plate and application
KR101743924B1 (en) Carbon fiber felt integrated bipolar plate for batteries and method for manufacturing same
KR20180076949A (en) Polymer electrolyte membrane for fuel cell and manufacturing method thereof
US7507318B2 (en) Devices using resin wafers and applications thereof
KR102127037B1 (en) Electrode structure and redox flow battery comprising the same
CN114937785A (en) Composite graphite bipolar plate for flow battery and preparation method thereof
CN115101770A (en) Flow battery composite bipolar plate and processing technology thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination