CN109585871A - A kind of graphene-based bipolar plates and preparation method thereof - Google Patents
A kind of graphene-based bipolar plates and preparation method thereof Download PDFInfo
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- CN109585871A CN109585871A CN201811276626.XA CN201811276626A CN109585871A CN 109585871 A CN109585871 A CN 109585871A CN 201811276626 A CN201811276626 A CN 201811276626A CN 109585871 A CN109585871 A CN 109585871A
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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
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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
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- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
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Abstract
The present invention provides a kind of graphene-based bipolar plates and preparation method thereof.The thinner thickness of graphene-based bipolar plates provided by the invention is mainly made of graphene, carbon fiber and a small amount of high molecular material.High conductivity Sheet Graphite alkene and two-dimensional structure carbon fiber can guarantee the high horizontal and vertical conductivity of bipolar plates, assign pile high current ability to work, a small amount of high molecular material plays the effect of bonding graphene and carbon fiber, and graphene-based bipolar plates is made to have certain air-tightness and mechanical strength.Graphene-based bipolar plates of the invention show high electron conduction, while having both good flexibility, air-tightness, corrosion resistance and mechanical strength.Bipolar plates preparation process of the invention is simple, operating unit is few, can Rapid Popularization, and accomplish scale production.
Description
Technical field
The present invention relates to battery pile bipolar plates preparation field, especially a kind of graphene-based bipolar plates and its preparation side
Method.
Background technique
In power battery or energy-storage battery field, need to be wanted according to voltage and current specific of the electricity consumption product to battery
It asks, multiple single batteries is composed according to specific serial or parallel connection mode.For concatenated pile form, different monomers
It needs effectively to connect to reduce the contact resistance of pile between battery, component interconnected is bipolar plates.In pile, performance is led
The bipolar plates of line function effectively connect the positive and negative electrode of adjacent cell, allow current to enough effectively be connected, and bipolar plates is needed to have pole
High electron conduction.Meanwhile bipolar plates should also have sufficiently high air-tightness, i.e., itself cannot be pure the hole the defects of, with
The different material of completely isolated bipolar plates two sides, the especially anode and cathode active materials in battery.In view of pile to bipolar plates
It is strict with, bipolar plates of good performance need to have the property that electron conduction height, to reduce contact resistance in pile,
Improve the voltage efficiency of pile；Flexibility is good, meets extruding of the pile assembling process external pressure to component, avoids crushing bipolar
Plate；Enough consistency, bipolar plates can be effectively isolated gas, fluid molecule, prevent the diffusion of positive and negative electrode substance；Resistance toization
Learn, electrochemical corrosion it is strong, bipolar plates without degradation, and then assign pile long service life under battery context；It is thermally conductive
Property it is good, by pile operation generate heat distribute in time, maintain pile working temperature constant；It is at low cost, convenient for reducing electricity
Heap cost.
Currently, researcher develops Metal Substrate bipolar plates, conductive plastic bi-polar plate and pure carbon bipolar plate.Metal Substrate bipolar plates
Material cost, chemically-resistant corrosion a series of problems, such as limit its application；The electric conductivity and machinery of conductive plastic bi-polar plate are strong
There are irreconcilable contradictions between degree, it is difficult to obtain the bipolar plates of excellent combination property；The production technology of pure carbon bipolar plate is opposite
It is extremely complex, it causes its preparation cost higher, is difficult to promote in extensive energy-storage pile field.
Summary of the invention
In view of above-mentioned analysis and presently, there are the problem of, the present invention makes full use of the superior electrical conductivity of grapheme material, lead to
The design of optimization conductive network is crossed, realizes changing for bipolar plates comprehensive performance using different conducting material structures and the complementary effect of performance
It is kind, prepare the bipolar plate material haveing excellent performance.Specifically, bipolar plates of the present invention are using sheet graphene and two-dimentional carbon fiber
It ties up two kinds of materials and builds conductive network jointly, macromolecule resin has been refilled in the gap of conductive network, to guarantee bipolar plates
Conductive channel is all had horizontal and vertical, while guaranteeing that bipolar plates have good mechanical strength, corrosion resistance and air-tightness.
It is an object of the present invention to provide a kind of bipolar plates, the bipolar plates include graphene, carbon fiber and macromolecule
Resin.
At least one of specifically, the bipolar plates further include following 1) -10) described:
1) mass ratio of graphene and carbon fiber includes 10:1~1:10；Specifically, the mass ratio of graphene and carbon fiber
For 5:1,1:4,3:1 or 1:1；It is preferred that 1:4 or 3:1；
2) number of plies of graphene includes 1 layer~200 layers；Specifically, the number of plies of graphene include 5 layers~10 layers, 20 layers~
40 layers, 1 layer~3 layers or 120 layers~140 layers；It is preferred that 20 layers~40 layers or 1 layer~3 layers；
3) lamella size of graphene includes 25 μm of 0.5 μ m, 0.5 μm~12 μ m；Specifically, the lamella ruler of graphene
Very little includes 25 μm of 12 μm of 2.5 μ m, 18 μm of 10 μ m, 6 μm of 1.5 μ m or 12 μ ms；It is preferred that 6 μ of 18 μm of 10 μ m or 1.5 μ m
m；
4) carbon fiber includes two-dimentional carbon fiber；
5) carbon fiber includes two-dimentional carbon fiber, and the average diameter of the two dimension carbon fiber includes 0.5 μm~50 μm, and/or
Length includes 2 μm~200 μm；Specifically, the average diameter of the two dimension carbon fiber is 4.2 μm, 2.3 μm or 1.2 μm, and/or
Length is 120 μm, 35 μm, 25 μm or 150 μm；Preferably, the average diameter of the two-dimentional carbon fiber is 2.3 μm or 1.2 μm,
And/or length is 35 μm or 25 μm；
6) graphene and carbon fiber form the conductive network of bipolar plates, and macromolecule resin is located at the gap of conductive network；Tool
Body, the conductive network has the function of electronic conduction；The conductive network is excellent electronic conductor, horizontal and vertical network
With good node is contacted, electronics can smooth transmitting in all directions；The preparation method of the conductive network includes by stone
Black alkene and carbon fiber are mixed to form organic whole, and carbon fiber has good contact with graphene in entirety；And/or it is located at conduction
The macromolecule resin in network gap guarantees that bipolar plates have enough air-tightness；Enough air-tightness refer to small molecule gas
Body is absolutely isolated, and/or is able to maintain permanent isolation to acid or alkaline solution；
7) graphene and carbon fiber form the conductive network of bipolar plates, and conductive network includes three-dimensional porous structure；Specifically,
The porosity ranges of the three-dimensional porous structure include 15%~60%；
8) macromolecule resin includes thermoplasticity and/or thermosetting polymer resin；Specifically, the macromolecule resin
Including mobility liquid can be made by heating or solvent dissolution；Again specifically, the macromolecule resin includes polyene
Hydrocarbon materials and/or aromatic hydrocarbon resin；Also specifically, the macromolecule resin includes polyethylene, polypropylene, Kynoar
And/or polyacrylonitrile；It is preferred that polypropylene or Kynoar；
9) mass percentage of the macromolecule resin in bipolar plates is 2%~8%；
10) bipolar plates with a thickness of 0.2mm~1.5mm.
Specifically, the preparation method of the bipolar plates includes: by graphene and carbon fiber premix, molding and dipping macromolecule
Resin solution.
At least one of specifically, the preparation method of the bipolar plates further includes following 1) -5) described:
1) premix includes dry mixed and/or wet-mixing；Specifically, the dry mixed include by graphene with
The dry powder of carbon fiber is directly over ball milling and/or mechanical stirring mixing；Again specifically, the ball milling includes 100 turns or more/minute
Handle 20min or more；Also specifically, the ball milling includes handling 60-120min under 400-1200 revs/min；It is preferred that 500 turns/
120min is handled under minute；The wet-mixing includes that mechanical stirring is mixed in solvent medium by the powder of graphene and carbon fiber
It closes；Again specifically, the wet-mixing include will under the powder of graphene and carbon fiber in ethanol ultrasonic wave handle 30min with
On；It is preferred that handling 90min under ultrasonic wave；
2) molding includes compression moulding and/or filtering shaping；Specifically, the compression moulding includes after premixing
Graphene and carbon fiber are laid into the thin layer of 0.2-10mm, 10-100MPa compression moulding in a mold；Also specifically, being laid into
2.2, the thin layer of 2.8 or 3.5mm, 15,20 or 80MPa compression moulding；It is preferred that being laid into the thin layer of 3.5mm, 20MPa is pressed into
Type；The filtering shaping includes the graphene and carbon fiber after premixing, and obtains thickness using vacuum pumping method in strainer mold
Degree is the film layer of 0.2-10mm, obtained by drying；Preferably, a thickness is obtained using vacuum pumping method in 1200 mesh filter screen molds
For the film layer of 5.5mm, it is placed in obtained by drying in 120 DEG C of baking oven；
3) dipping, which is included under room temperature~150 DEG C, 10KPa~100KPa, impregnates；Specifically, the dipping is included in
It is impregnated under room temperature or 150 DEG C, 10KPa, 20KPa or 40KPa；It is preferred that being impregnated under room temperature or 150 DEG C, 40KPa；Specifically, described
Dipping further includes dipping 10min or more；Again specifically, dipping 25-60min；Also specifically, 25,30,50 or 60min of dipping；It is excellent
Select 30 or 60min；
4) high-molecular resin solution includes the solution obtained after melting macromolecule resin and/or by macromolecule resin
The solution obtained after being dissolved with solvent；Specifically, the high-molecular resin solution includes following a)-d) it is described at least one
Kind: a) polyethylene melted completely at 150 DEG C；B) polypropylene melted completely at 180 DEG C；C) by Kynoar two
It is dissolved in methylformamide, the solution that the mass fraction of acquisition is 1.8%；D) polyacrylonitrile is molten in N-methyl pyrrolidones
Solution, the solution that the mass fraction of acquisition is 2.2%；
It 5) further include dry after the dipping and/or compacting；Specifically, the drying and/or compacting be included in room temperature~
150 DEG C, suppress 5-60min under 10KPa~100KPa；Also specifically, room temperature or 150 DEG C, 30KPa, 60KPa, 95KPa or
5,8,12 or 20min is suppressed under 100KPa；Preferably, it is suppressed under 8min or 150 DEG C of compacting, 100MPa under room temperature, 60MPa
12min。
It is a further object to provide a kind of preparation method of bipolar plates, the preparation method includes: by graphite
Alkene and carbon fiber premix, molding and dipping high-molecular resin solution.
At least one of specifically, the preparation method further includes following 1) -15) described:
1) mass ratio of graphene and carbon fiber includes 10:1~1:10；Specifically, the mass ratio of graphene and carbon fiber
For 5:1,1:4,3:1 or 1:1；It is preferred that 1:4 or 3:1；
2) number of plies of graphene includes 1 layer~200 layers；Specifically, the number of plies of graphene include 5 layers~10 layers, 20 layers~
40 layers, 1 layer~3 layers or 120 layers~140 layers；It is preferred that 20 layers~40 layers or 1 layer~3 layers；
3) lamella size of graphene includes 25 μm of 0.5 μ m, 0.5 μm~12 μ m；Specifically, the lamella ruler of graphene
Very little includes 25 μm of 12 μm of 2.5 μ m, 18 μm of 10 μ m, 6 μm of 1.5 μ m or 12 μ ms；It is preferred that 6 μ of 18 μm of 10 μ m or 1.5 μ m
m；
4) carbon fiber includes two-dimentional carbon fiber；
5) carbon fiber includes two-dimentional carbon fiber, and the average diameter of the two dimension carbon fiber includes 0.5 μm~50 μm, and/or
Length includes 2 μm~200 μm；Specifically, the average diameter of the two dimension carbon fiber is 4.2 μm, 2.3 μm or 1.2 μm, and/or
Length is 120 μm, 35 μm, 25 μm or 150 μm；Preferably, the average diameter of the two-dimentional carbon fiber is 2.3 μm or 1.2 μm,
And/or length is 35 μm or 25 μm；
6) graphene and carbon fiber form the conductive network of bipolar plates, and macromolecule resin is located at the gap of conductive network；Tool
Body, the conductive network has the function of electronic conduction；The conductive network is excellent electronic conductor, horizontal and vertical network
With good node is contacted, electronics can smooth transmitting in all directions；The preparation method of the conductive network includes by stone
Black alkene and carbon fiber are mixed to form organic whole, and carbon fiber has good contact with graphene in entirety；And/or it is located at conduction
The macromolecule resin in network gap guarantees that bipolar plates have enough air-tightness；Enough air-tightness refer to small molecule gas
Body is absolutely isolated, and/or is able to maintain permanent isolation to acid or alkaline solution；
7) graphene and carbon fiber form the conductive network of bipolar plates, and conductive network includes three-dimensional porous structure；Specifically,
The porosity ranges of the three-dimensional porous structure include 15%~60%；
8) macromolecule resin includes thermoplasticity and/or thermosetting polymer resin；Specifically, the macromolecule resin
Including mobility liquid can be made by heating or solvent dissolution；Again specifically, the macromolecule resin includes polyene
Hydrocarbon materials and/or aromatic hydrocarbon resin；Also specifically, the macromolecule resin includes polyethylene, polypropylene, Kynoar
And/or polyacrylonitrile；It is preferred that polypropylene or Kynoar；
9) mass percentage of the macromolecule resin in bipolar plates is 2%~8%；
10) bipolar plates with a thickness of 0.2mm~1.5mm；
11) premix includes dry mixed and/or wet-mixing；Specifically, the dry mixed includes by graphene
Ball milling is directly over the dry powder of carbon fiber and/or mechanical stirring mixes；Again specifically, the ball milling includes 100 turns or more/points
Clock handles 20min or more；Also specifically, the ball milling includes handling 60-120min under 400-1200 revs/min；It is preferred that 500
120min is handled under rev/min；The wet-mixing includes that machinery stirs in solvent medium by the powder of graphene and carbon fiber
Mix mixing；Again specifically, the wet-mixing includes that will handle under the powder of graphene and carbon fiber in ethanol ultrasonic wave
30min or more；It is preferred that handling 90min under ultrasonic wave；
12) molding includes compression moulding and/or filtering shaping；Specifically, the compression moulding includes after premixing
Graphene and carbon fiber be laid into the thin layer of 0.2-10mm, 10-100MPa compression moulding in a mold；Also specifically, tiling
At the thin layer of 2.2,2.8 or 3.5mm, 15,20 or 80MPa compression moulding；It is preferred that being laid into the thin layer of 3.5mm, 20MPa is pressed into
Type；The filtering shaping includes the graphene and carbon fiber after premixing, and obtains thickness using vacuum pumping method in strainer mold
Degree is the film layer of 0.2-10mm, obtained by drying；Preferably, a thickness is obtained using vacuum pumping method in 1200 mesh filter screen molds
For the film layer of 5.5mm, it is placed in obtained by drying in 120 DEG C of baking oven；
13) dipping, which is included under room temperature~150 DEG C, 10KPa~100KPa, impregnates；Specifically, the dipping includes
It is impregnated at room temperature or 150 DEG C, 10KPa, 20KPa or 40KPa；It is preferred that being impregnated under room temperature or 150 DEG C, 40KPa；Specifically, institute
Stating dipping further includes dipping 10min or more；Again specifically, dipping 25-60min；Also specifically, 25,30,50 or 60min of dipping；
It is preferred that 30 or 60min；
14) high-molecular resin solution includes the solution obtained after melting macromolecule resin and/or by high score subtree
The solution that rouge obtains after being dissolved with solvent；Specifically, the high-molecular resin solution includes following a)-d) it is described at least one
Kind: a) polyethylene melted completely at 150 DEG C；B) polypropylene melted completely at 180 DEG C；C) by Kynoar two
It is dissolved in methylformamide, the solution that the mass fraction of acquisition is 1.8%；D) polyacrylonitrile is molten in N-methyl pyrrolidones
Solution, the solution that the mass fraction of acquisition is 2.2%；
It 15) further include dry after the dipping and/or compacting；Specifically, the drying and/or compacting be included in room temperature~
150 DEG C, suppress 5-60min under 10KPa~100KPa；Also specifically, room temperature or 150 DEG C, 30KPa, 60KPa, 95KPa or
5,8,12 or 20min is suppressed under 100KPa；Preferably, it is suppressed under 8min or 150 DEG C of compacting, 100MPa under room temperature, 60MPa
12min。
Of the invention a further object is provides the present invention bipolar plates that any the method is directly prepared.
Of the invention a further object is provides the present invention application of any bipolar plates.
Specifically, the application includes being used to prepare pile and/or its Related product.
Of the invention a further object is provides the present invention application of any the method.
Graphene-based bipolar plates provided by the invention have special conducting matrix grain, by Sheet Graphite alkene and carbon fiber group
At horizontal and vertical in bipolar plates all has conductive channel, while bipolar plates have good mechanical strength, corrosion resistance gentle
Close property.Bipolar plates prepared by the present invention are relatively thin, can effectively improve the energy density of pile, it may have certain flexibility is prevented
Only there is fragmentation problem in use process in bipolar plates.
Unless otherwise specified, percentage according to the present invention is mass percent.
The advantages of the present invention are:
1, fabulous electron conduction is had based on grapheme material, utilizes graphene and carbon fiber constructions novel conductive net
Network realizes the bipolar plate design and preparation of excellent combination property.Bipolar plates of the present invention have both good electric conductivity, air-tightness, machine
Tool, corrosion resistance and economy.
2, constructing the composite material with specific function jointly using sheet layer material and fibrous material may be implemented material knot
The mutual supplement with each other's advantages of structure and performance is an original creativity technology, can be generalized to the design and system of other types functional material
It is standby.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, not
Constitute the improper restriction to the application.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of bipolar plates provided by the invention.
Specific embodiment
Made in following embodiments, experimental method is conventional method unless otherwise specified.
Material as used in the following examples etc., is commercially available unless otherwise specified.
Following embodiments and its illustrate for explanation and understanding the present invention, do not constitute to improper limit of the invention
It is fixed.
In following embodiments, unless specified otherwise, the percentage being related to is mass percent.
Embodiment 1
Choose the number of plies be 5~10 layers, the graphene having a size of 12 μm of 2.5 μ m and average diameter is 4.2 μm, length is
120 μm of carbon fiber is conductive network composition material.It is that 5:1 weighs above-mentioned material according to mass ratio, is placed in ball mill
60min is handled under 1200 revs/min, obtains uniformly mixed conducing composite material.The above-mentioned of certain mass is weighed to be uniformly mixed
Conducing composite material, the thin layer of 2.2mm is laid into a mold, in 15MPa compression moulding.Certain weight northylen is weighed,
It is melted completely at 150 DEG C, the conductive network of above-mentioned compression moulding is completely infused in polyvinyl resin solution, at 20KPa,
50min is impregnated at 150 DEG C, obtains dipping bipolar plates.
Above-mentioned dipping bipolar plates suppress 5min at room temperature, 95MPa, obtain the graphene-based bipolar of the present embodiment design
Plate.
Performance evaluation is carried out to graphene-based bipolar plates.
Thickness: 0.4mm；
Tensile strength: about 41MPa；
Bending strength: 360 ° bent；
Electronic conductivity: about 220S/cm.
Embodiment 2
Choose that the number of plies is 20~40 layers, the graphene having a size of 18 μm of 10 μ m and average diameter are 2.3 μm, length 35
μm carbon fiber be conductive network composition material.According to mass ratio be 1:4 weigh above-mentioned material, be placed in ball mill 500 turns/
120min is handled under minute, obtains uniformly mixed conducing composite material.Weigh the above-mentioned uniformly mixed conduction of certain mass
Composite material is laid into the thin layer of 3.5mm in a mold, in 20MPa compression moulding.A certain amount of polypropylene is weighed, at 180 DEG C
Melting completely, the conductive network of above-mentioned compression moulding is completely infused in acrylic resin solution, at 40KPa, at 150 DEG C
60min is impregnated, dipping bipolar plates are obtained.
Above-mentioned dipping bipolar plates suppress 8min at room temperature, 60MPa, obtain the graphene-based bipolar of the present embodiment design
Plate.
Performance evaluation is carried out to graphene-based bipolar plates.
Thickness: 1.2mm；
Tensile strength: about 55MPa；
Bending strength: 360 ° bent；
Electronic conductivity: about 231S/cm.
Embodiment 3
Choose the number of plies be 1~3 layer, the graphene having a size of 6 μm of 1.5 μ m and average diameter is 1.2 μm, length is 25 μm
Carbon fiber be conductive network composition material.It is that 3:1 weighs above-mentioned material according to mass ratio, is placed in excess ethyl alcohol, in ultrasound
90min is handled under wave, obtains uniformly mixed conducing composite material.The above-mentioned uniformly mixed conduction for weighing certain mass is compound
Material obtains one using vacuum pumping method in 1200 mesh filter screen molds with a thickness of the film layer of 5.5mm, is placed in 120 DEG C of baking oven
In, it is dried for standby.Certain weight poly (vinylidene fluoride) is weighed, is dissolved in dimethylformamide, the tree that mass fraction is 1.8% is obtained
Above-mentioned molding conductive network film layer is completely infused in resin solution, impregnates 30min at room temperature, 40KPa by lipoprotein solution,
Obtain dipping bipolar plates.
Above-mentioned dipping bipolar plates suppress 12min at 150 DEG C, 100MPa, obtain the graphene-based double of the present embodiment design
Pole plate.
Performance evaluation is carried out to graphene-based bipolar plates.
Thickness: 1.0mm；
Tensile strength: about 53MPa；
Bending strength: 360 ° bent；
Electronic conductivity: about 2 65S/cm.
Embodiment 4
Choose the number of plies be 120~140 layers, the grapheme material having a size of 25 μm of 12 μ m and diameter is 4.2 μm, length is
150 μm of carbon fiber is conductive network composition material.It is that 1:1 weighs above-mentioned material according to mass ratio, is placed in ball mill 400
120min is handled under rev/min, obtains uniformly mixed conducing composite material.The above-mentioned uniformly mixed of certain mass is weighed to lead
Composite is laid into the thin layer of 2.8mm in a mold, in 80MPa compression moulding.Certain weight polyacrylonitrile is weighed, in nitrogen
It is dissolved into the resin solution that mass fraction is 2.2% in methyl pyrrolidone, the conductive network of above-mentioned compression moulding is soaked completely
Stain impregnates 25min in resin solution at 10KPa, obtains dipping bipolar plates.
Above-mentioned dipping bipolar plates suppress 20min at room temperature, 30MPa, obtain the graphene-based bipolar of the present embodiment design
Plate.
Performance evaluation is carried out to graphene-based bipolar plates.
Thickness: 0.8mm；
Tensile strength: about 38MPa；
Bending strength: 360 ° bent；
Electronic conductivity: about 210S/cm.
The performance test results of the graphene-based bipolar plates of embodiment 1-4 preparation show that the present invention designs graphene-based
Bipolar plates show good electric conductivity and mechanical strength, can meet the requirement of pile high current density work, sheet and fiber
The conductive network of two kinds of structural conductive materials building has played fabulous electronic conduction function, and it is double that high molecular material has played enhancing
The effect of pole plate mechanical strength and air-tightness.Graphene-based bipolar plates preparation process proposed by the present invention is simple, equipment investment is small,
Cost of material is low, can fast implement large-scale production.
Embodiments of the present invention above described embodiment only expresses, the description thereof is more specific and detailed, but can not
Therefore limitations on the scope of the patent of the present invention are interpreted as, as long as skill obtained in the form of equivalent substitutions or equivalent transformations
Art scheme should all be fallen within the scope and spirit of the invention.
Claims (10)
1. a kind of bipolar plates, which is characterized in that the bipolar plates include graphene, carbon fiber and macromolecule resin.
2. bipolar plates according to claim 1, which is characterized in that the bipolar plates further include following 1) -10) it is described in
It is at least one:
1) mass ratio of graphene and carbon fiber includes 10:1~1:10；
2) number of plies of graphene includes 1 layer~200 layers；
3) lamella size of graphene includes 25 μm of 0.5 μ m, 0.5 μm~12 μ m；
4) carbon fiber includes two-dimentional carbon fiber；
5) carbon fiber includes two-dimentional carbon fiber, and the average diameter of the two dimension carbon fiber includes 0.5 μm~50 μm and/or length
Including 2 μm~200 μm；
6) graphene and carbon fiber form the conductive network of bipolar plates, and macromolecule resin is located at the gap of conductive network；
7) graphene and carbon fiber form the conductive network of bipolar plates, and conductive network includes three-dimensional porous structure；
8) macromolecule resin includes thermoplasticity and/or thermosetting polymer resin；
9) mass percentage of the macromolecule resin in bipolar plates is 2%~8%；
10) bipolar plates with a thickness of 0.2mm~1.5mm.
3. according to claim 1 and/or 2 any bipolar plates, which is characterized in that the preparation method packet of the bipolar plates
It includes: by graphene and carbon fiber premix, molding and dipping high-molecular resin solution.
4. bipolar plates according to claim 3, which is characterized in that the preparation method of the bipolar plates further include it is following 1)-
5) at least one of described:
1) premix includes dry mixed and/or wet-mixing；
Specifically, the dry mixed includes the dry powder of graphene and carbon fiber being directly over ball milling and/or mechanical stirring is mixed
It closes；The wet-mixing includes that the mechanical stirring in solvent medium mixes with the powder of carbon fiber by graphene；
2) molding includes compression moulding and/or filtering shaping；
Specifically, the compression moulding includes that the graphene after premix is laid into the thin of 0.2-10mm with carbon fiber in a mold
Layer, 10-100MPa compression moulding；The filtering shaping includes the graphene and carbon fiber after premixing, sharp in strainer mold
The film layer with a thickness of 0.2-10mm is obtained with vacuum pumping method, it is obtained by drying；
3) dipping, which is included under room temperature~150 DEG C, 10KPa~100KPa, impregnates；
Specifically, the dipping further includes dipping 10min or more；
4) high-molecular resin solution include the solution obtained after melting macromolecule resin and/or by macromolecule resin with molten
The solution obtained after agent dissolution；
It 5) further include dry after the dipping and/or compacting；
Specifically, the drying and/or compacting, which are included under room temperature~150 DEG C, 10KPa~100KPa, suppresses 5-60min.
5. a kind of preparation method of bipolar plates, which is characterized in that the preparation method include: by graphene and carbon fiber premix,
Molding and dipping high-molecular resin solution.
6. according to the method described in claim 5, it is characterized in that, the preparation method further includes following 1) -15) it is described in
It is at least one:
1) mass ratio of graphene and carbon fiber includes 10:1~1:10；
2) number of plies of graphene includes 1 layer~200 layers；
3) lamella size of graphene includes 25 μm of 0.5 μ m, 0.5 μm~12 μ m；
4) carbon fiber includes two-dimentional carbon fiber；
5) carbon fiber includes two-dimentional carbon fiber, and the average diameter of the two dimension carbon fiber includes 0.5 μm~50 μm and/or length
Including 2 μm~200 μm；
6) graphene and carbon fiber form the conductive network of bipolar plates, and macromolecule resin is located at the gap of conductive network；
7) graphene and carbon fiber form the conductive network of bipolar plates, and conductive network includes three-dimensional porous structure；
8) macromolecule resin includes thermoplasticity and/or thermosetting polymer resin；
9) mass percentage of the macromolecule resin in bipolar plates is 2%~8%；
10) bipolar plates with a thickness of 0.2mm~1.5mm；
11) premix includes dry mixed and/or wet-mixing；
Specifically, the dry mixed includes the dry powder of graphene and carbon fiber being directly over ball milling and/or mechanical stirring is mixed
It closes；The wet-mixing includes that the mechanical stirring in solvent medium mixes with the powder of carbon fiber by graphene；
12) molding includes compression moulding and/or filtering shaping；
Specifically, the compression moulding includes that the graphene after premix is laid into the thin of 0.2-10mm with carbon fiber in a mold
Layer, 10-100MPa compression moulding；The filtering shaping includes the graphene and carbon fiber after premixing, sharp in strainer mold
The film layer with a thickness of 0.2-10mm is obtained with vacuum pumping method, it is obtained by drying；
13) dipping, which is included under room temperature~150 DEG C, 10KPa~100KPa, impregnates；
Specifically, the dipping further includes dipping 10min or more
14) high-molecular resin solution includes the solution obtained after melting macromolecule resin and/or uses macromolecule resin
The solution obtained after solvent dissolution；
It 15) further include dry after the dipping and/or compacting；
Specifically, the drying and/or compacting, which are included under room temperature~150 DEG C, 10KPa~100KPa, suppresses 5-60min；
7. the bipolar plates that claim 5 and/or 6 any the methods are directly prepared.
8. the application of claim 1,2,3,4 and/or 7 any bipolar plates.
9. application according to claim 8, which is characterized in that the application includes being used to prepare pile and/or its correlation
Product.
10. the application of claim 5 and/or 6 any the methods.
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| CN110993981A (en) * | 2019-12-17 | 2020-04-10 | 上海大学 | Method for preparing ultrathin carbon/carbon composite bipolar plate |
| WO2021068318A1 (en) * | 2019-10-12 | 2021-04-15 | 宇石能源(南通)有限公司 | Method for preparing fuel cell graphite bipolar plate |
| CN113921841A (en) * | 2021-09-14 | 2022-01-11 | 同济大学 | Graphite composite bipolar plate of fuel cell, preparation method and fuel cell |
| CN114256476A (en) * | 2022-03-01 | 2022-03-29 | 杭州德海艾科能源科技有限公司 | Conductive polymer bipolar plate for flow battery and preparation method thereof |
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