CN108365224B - Polar plate and preparation method thereof - Google Patents
Polar plate and preparation method thereof Download PDFInfo
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- CN108365224B CN108365224B CN201810150290.6A CN201810150290A CN108365224B CN 108365224 B CN108365224 B CN 108365224B CN 201810150290 A CN201810150290 A CN 201810150290A CN 108365224 B CN108365224 B CN 108365224B
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention discloses a polar plate and a preparation method thereof, relating to the technical field of batteries. The method comprises the following steps: the conductive polyethylene substrate layer, the conductive adhesive layer and the graphite sheet layer; the conductive sizing material layer is coated on the polyethylene conductive substrate layer; the graphite sheet layer is bonded with the polyethylene conductive substrate layer through the conductive adhesive layer; the polar plate can reduce the surface contact resistance and the resistivity, thereby improving the voltage efficiency of the liquid flow energy storage battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a polar plate and a preparation method of the polar plate.
Background
The flow energy storage battery is low in cost, high in efficiency and environment-friendly, and has the advantages of high energy density and current efficiency, simple and easy device operation, long service life, low cost and the like. The conventional flow energy storage battery mainly comprises an all-vanadium flow battery and a zinc-bromine flow battery, and is mainly used in the fields of power grid peak shaving, power generation of renewable energy sources such as wind energy and solar energy, electric vehicles and the like; in the liquid flow energy storage battery, the polar plate influences the voltage efficiency of the battery, the traditional polar plate mostly adopts a graphite pressing plate sheet or a carbon addition type conductive sheet of a polyethylene base material as the polar plate, and the preparation cost of the carbon addition type conductive sheet of the graphite pressing plate sheet is higher, so that the traditional polar plate mostly adopts the carbon addition type conductive sheet of the polyethylene base material as the polar plate, relatively speaking, the resistivity of the carbon addition type conductive sheet of the polyethylene base material is higher due to the limitation of mechanism, and the preparation difficulty can be greatly improved if the resistivity is lower.
Disclosure of Invention
The invention aims to provide a polar plate which can reduce surface contact resistance and resistivity, thereby improving the voltage efficiency of a flow energy storage battery.
In order to achieve the purpose, the invention provides the following technical scheme:
according to an aspect of the invention, there is provided a plate comprising: the conductive polyethylene substrate layer, the conductive adhesive layer and the graphite sheet layer;
the conductive sizing material layer is coated on the polyethylene conductive substrate layer; the graphite sheet layer is bonded with the polyethylene conductive substrate layer through the conductive adhesive layer.
Further, the conductive adhesive layer is composed of the following raw materials in parts by weight: 200 parts of N-methylpyrrolidone, 5-8 parts of polyvinylidene fluoride and 1-5 parts of graphene.
Furthermore, the graphite sheet layer is made of 80-120-mesh graphite sheets.
Further, the thickness of the conductive adhesive layer is 0.4-0.7 mm.
The invention aims to provide a preparation method of a polar plate, which can prepare a polar plate with reduced surface contact resistance and is low in cost.
In order to achieve the purpose, the invention provides the following technical scheme:
according to another aspect of the present invention, there is provided a method for manufacturing a plate, the plate provided by the above technical solution, including the steps of:
and step S1: adding a conductive additive into a polyethylene base material, and uniformly mixing by adopting a rotary stirring mode to obtain a polyethylene conductive substrate mixture;
and step S2: feeding the mixture of the polyethylene conductive substrate into a co-rotating double-screw extruder, carrying out hot melting, mixing and extruding, extruding a polyethylene conductive substrate sheet, and cooling and forming to obtain the polyethylene conductive substrate layer;
and step S3: preparing an N-methyl pyrrolidone solution containing polyvinylidene fluoride according to a proportion, adding graphene into the N-methyl pyrrolidone solution according to a proportion, and performing rotary stirring to obtain the conductive adhesive material layer;
and step S4: coating the conductive glue layer on the polyethylene conductive substrate layer by using a coating machine;
and step S5: sun-drying a graphite sheet layer on the polyethylene conductive substrate layer coated with the conductive adhesive layer, wherein the graphite sheet layer is bonded on the polyethylene conductive substrate layer through the conductive adhesive layer;
and step S6: graphite lamella bonding silica gel, and dorsad the conductive adhesive layer the bonding silica gel on the polyethylene conductive substrate layer, after hot-pressing bonding and cooling forming, take off the silica gel, obtain the polar plate.
Further, before the step of S1, the method for preparing the plate further includes:
mixing conductive carbon black, graphite, carbon nanotubes and carbon fiber powder, and premixing the mixture uniformly by adopting a rotary stirring mode to obtain the conductive additive.
Further, in the step S1, when the polyethylene conductive substrate mixture is subjected to hot-melt mixing extrusion, the extrusion temperature is 200-;
when the polyethylene conductive substrate sheet is cooled and formed, the polyethylene conductive substrate sheet is cooled and rolled and formed by a calender roll, the temperature of the calender roll is 80-90 ℃, the roll speed is controlled at the linear speed of 4-8m/min, and the polyethylene conductive substrate layer can be obtained by shearing according to the size requirement.
Further, in step S4, before the conductive adhesive layer is coated on the polyethylene conductive substrate layer, the polyethylene conductive substrate layer is surface-polished and cleaned by 400-mesh 600-mesh sand paper; and the number of the first and second groups,
in step S5, the graphite sheet layer is uniformly applied to the polyethylene conductive substrate layer coated with the conductive paste layer by using an 80-100 mesh screen.
Further, in step S6, the process of obtaining the plate is as follows:
after the silica gel is bonded, the whole is placed in a mold with a fixed thickness, the mold is placed in a flat vulcanizing instrument for hot-press bonding and cooling forming, after cooling forming, the mold is opened, and the silica gel is removed, so that the polar plate is obtained.
Further, when the flat vulcanizing instrument is used for hot-press bonding, the hot-press temperature is 140-Hot pressing pressure of 40-60kg/cm at 170 deg.C2The hot pressing time is 200-300 s; and the number of the first and second groups,
when the flat vulcanizing machine is used for cooling and forming, the cooling pressure is 40-60kg/cm2The cooling temperature is 25-30 ℃, and the cooling time is 200-300 s.
Compared with the prior art, the invention has the beneficial effects that:
according to the polar plate, for the polar plate, the graphite sheet layer is bonded on the polyethylene conductive substrate layer through the conductive adhesive layer, so that the surface contact resistance of the polar plate is reduced, the resistivity is reduced, and the voltage efficiency of the liquid flow energy storage battery is improved;
according to the preparation method of the polar plate, the polar plate capable of reducing the surface contact resistance is prepared through six steps, the polyethylene base material is adopted as the raw material, so that the preparation method is low in preparation cost, the difficulty of reducing the resistivity of the carbon-added conductive sheet material of the polyethylene base material due to the limitation of mechanism is avoided, only one graphite sheet layer needs to be added on the polyethylene conductive substrate layer, and the preparation is simple.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a plate according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of making a plate according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for manufacturing a plate according to an embodiment of the present invention.
Icon: 10-a polyethylene conductive substrate layer; 20-a conductive glue layer; 30-graphite sheet layer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
According to an aspect of the present invention, there is provided a plate, as shown in fig. 1, comprising: a polyethylene conductive substrate layer 10, a conductive adhesive layer 20 and a graphite sheet layer 30;
the conductive adhesive layer 20 is coated on the polyethylene conductive substrate layer 10; graphite sheet 30 is bonded to polyethylene conductive substrate layer 10 by conductive paste layer 20.
According to the polar plate, for the polar plate, the graphite sheet layer 30 is bonded on the polyethylene conductive substrate layer 10 through the conductive adhesive layer 20, and the graphite sheet layer 30 enables the polar plate to reduce surface contact resistance, reduce resistivity and improve the voltage efficiency of the flow energy storage battery.
According to one embodiment of the plate of the present invention, the conductive adhesive layer 20 is composed of the following raw materials in parts by weight: 200 parts of N-methylpyrrolidone, 5-8 parts of polyvinylidene fluoride and 1-5 parts of graphene.
According to the electrode plate of the present invention, the conductive adhesive layer 20 is made of the raw materials in parts by weight, so as to make the conductive adhesive layer 20 have good conductive performance and adhesive property, wherein preferably, the conductive adhesive layer 20 is made of the raw materials in parts by weight: 100 parts of N-methyl pyrrolidone, 5 parts of polyvinylidene fluoride and 1 part of graphene, so that the conductivity and the bonding property of the conductive adhesive material layer 20 can be further improved.
In one embodiment of the plate of the present invention, the graphite sheet 30 is selected from an 80-20 mesh graphite sheet.
According to the polar plate, as for the selection of the graphite sheet layer 30, the graphite sheet layer 30 is made of 80-20-mesh graphite sheets, and the graphite sheet layer 30 can reduce the surface contact resistance of the polar plate to the minimum, so that the voltage efficiency of the liquid flow energy storage battery is further improved; among them, the graphite sheet 30 is preferably selected to be 80 mesh.
According to one embodiment of the plate of the present invention, the thickness of the conductive paste layer 20 is 0.4 to 0.7 mm.
According to the polar plate, the thickness of the conductive adhesive material layer 20 is 0.4-0.7mm, so that the conductive adhesive material layer 20 has better conductivity; the thickness of the silica gel is 1-2 mm.
According to another aspect of the present invention, there is provided a method for manufacturing an electrode plate, as shown in fig. 2, the electrode plate provided by the above technical solution, including the following steps:
and step S1: adding a conductive additive into a polyethylene base material, and uniformly mixing by adopting a rotary stirring mode to obtain a polyethylene conductive substrate mixture;
and step S2: feeding the mixture of the polyethylene conductive substrate into a co-rotating double-screw extruder, carrying out hot melting, mixing and extruding, extruding a polyethylene conductive substrate sheet, and cooling and forming to obtain a polyethylene conductive substrate layer;
and step S3: preparing an N-methyl pyrrolidone solution containing polyvinylidene fluoride according to a proportion, adding graphene into the N-methyl pyrrolidone solution according to the proportion, and performing rotary stirring to obtain a conductive adhesive material layer;
and step S4: coating a conductive adhesive layer on the polyethylene conductive substrate layer by using a coating machine;
and step S5: the graphite sheet layer is aired and scattered on the polyethylene conductive substrate layer coated with the conductive adhesive layer, and the graphite sheet layer is bonded on the polyethylene conductive substrate layer through the conductive adhesive layer;
and step S6: and bonding silica gel on the graphite sheet layer, wherein the graphite sheet layer is opposite to the conductive adhesive layer, bonding the silica gel on the polyethylene conductive substrate layer, performing hot-press bonding and cooling forming, and removing the silica gel to obtain the polar plate.
According to the preparation method of the polar plate, the polar plate capable of reducing the surface contact resistance is prepared through six steps, the polyethylene base material is adopted as the raw material, so that the preparation method is low in preparation cost, the difficulty of reducing the resistivity of the carbon-added conductive sheet material of the polyethylene base material due to the limitation of mechanism is avoided, only one graphite sheet layer needs to be added on the polyethylene conductive substrate layer, and the preparation is simple.
According to an embodiment of the method for manufacturing an electrode plate of the present invention, as shown in fig. 3, before the step of S1, the method for manufacturing an electrode plate further includes:
mixing conductive carbon black, graphite, carbon nanotubes and carbon fiber powder, and premixing the mixture to be uniform by adopting a rotary stirring mode to be used as a conductive additive.
According to the preparation method of the polar plate, the carbon nano tube and the carbon fiber powder are added into the general conductive additive, so that the polyethylene conductive substrate layer which is prepared by mixing and processing after adding the polyethylene base material is internally provided with the net-shaped winding lap joint, the deformation of the polyethylene conductive substrate layer can be effectively prevented, good conduction is realized, and the resistivity is reduced.
According to one embodiment of the preparation method of the polar plate, in the step S1, when the mixture of the polyethylene conductive substrate is subjected to hot-melt mixing extrusion, the extrusion temperature is 200-;
when the polyethylene conductive substrate sheet is cooled and molded, the polyethylene conductive substrate sheet is cooled and molded by a calender roll, the calender roll temperature is 80-90 ℃, the roll speed is controlled at the online speed of 4-8m/min, and the polyethylene conductive substrate layer can be obtained by shearing according to the size requirement.
According to the preparation method of the polar plate, the carbon addition content of the obtained polyethylene conductive substrate layer is controlled to be 40-60%, the resistivity of a test body is less than 10 omega-mm, the elongation at break is more than or equal to 30%, and the polar plate can be folded and attached without breaking.
According to one embodiment of the method for preparing the electrode plate, in the step S4, before the conductive glue layer is coated on the polyethylene conductive substrate layer, the polyethylene conductive substrate layer is surface-polished and cleaned by 400-mesh 600-mesh sand paper; and the number of the first and second groups,
in step S5, the graphite sheet layer is uniformly applied to the polyethylene conductive substrate layer coated with the conductive paste layer by using an 80-100 mesh screen.
According to the preparation method of the polar plate, before the conductive sizing material layer is coated on the polyethylene conductive substrate layer, the polyethylene conductive substrate layer needs to be polished and cleaned by using sand paper, so that the surface of the polyethylene conductive substrate layer is smooth, the conductive sizing material layer is conveniently coated on the polyethylene conductive substrate layer, and the coating of the conductive sizing material layer is more uniform;
and, use the screen cloth evenly to shine the graphite layer and spill to the polyethylene that is scribbled and is scribbled the conductive glue layer base plate layer on for the graphite layer shines more evenly that spills, makes polar plate surface contact resistance reduce more consistently.
According to an embodiment of the method for manufacturing an electrode plate of the present invention, in step S6, the process of obtaining an electrode plate is:
and after the glue layer is bonded, placing the whole in a mold with a fixed thickness, placing the mold in a flat vulcanizing instrument for hot-press bonding and cooling forming, opening the mold after cooling forming, and removing the silica gel to obtain the polar plate.
According to one embodiment of the preparation method of the polar plate, when the flat vulcanizing instrument is used for hot-press bonding, the hot-press temperature is 140-2The hot pressing time is 200-300 s; and the number of the first and second groups,
when the plate vulcanizer is used for cooling and forming, the cooling pressure is 40-60kg/cm2The cooling temperature is 25-30 ℃, and the cooling time is 200-300 s.
According to the preparation method of the polar plate, in order to ensure that the effect of the flat vulcanizing instrument on the hot-pressing bonding and cooling forming of the polar plate is better, the hot-pressing temperature is controlled to be 140-170 ℃, and the hot-pressing pressure is controlled to be 40-60kg/cm2The hot pressing time is controlled at 200-300s, and the cooling pressure is controlled at 40-60kg/cm2The cooling temperature is controlled to be 25-30 ℃, and the cooling time is controlled to be 200-300 s.
The polar plate and the preparation method of the polar plate have more optional factors. Various embodiments can be combined according to the claims of the present invention, and therefore the technical solutions combined according to the claims of the present invention are within the protection scope of the present invention. The top and bottom frame structures of the present invention will be further described with reference to specific embodiments.
Example 1
The polar plate according to the invention comprises: a polyethylene conductive substrate layer 10, a conductive adhesive layer 20 and a graphite sheet layer 30; the conductive adhesive layer 20 is coated on the polyethylene conductive substrate layer 10; the graphite sheet layer 30 is bonded with the polyethylene conductive substrate layer 10 through the conductive adhesive layer 20; the conductive adhesive layer 20 is composed of the following raw materials in parts by weight: 100 parts of N-methyl pyrrolidone, 5 parts of polyvinylidene fluoride and 1 part of graphene; the thickness of the conductive adhesive layer is 0.4 mm; the graphite sheet layer is 80-mesh graphite sheet.
Example 2
The polar plate according to the invention comprises: a polyethylene conductive substrate layer 10, a conductive adhesive layer 20 and a graphite sheet layer 30; the conductive adhesive layer 20 is coated on the polyethylene conductive substrate layer 10; the graphite sheet layer 30 is bonded with the polyethylene conductive substrate layer 10 through the conductive adhesive layer 20; the conductive adhesive layer 20 is composed of the following raw materials in parts by weight: 200 parts of N-methyl pyrrolidone, 8 parts of polyvinylidene fluoride and 5 parts of graphene; the thickness of the conductive adhesive layer 20 is 0.7 mm; the graphite sheet layer is 120-mesh graphite sheet.
Example 3
The polar plate according to the invention comprises: a polyethylene conductive substrate layer 10, a conductive adhesive layer 20 and a graphite sheet layer 30; the conductive adhesive layer 20 is coated on the polyethylene conductive substrate layer 10; the graphite sheet layer 30 is bonded with the polyethylene conductive substrate layer 10 through the conductive adhesive layer 20; the conductive adhesive layer 20 is composed of the following raw materials in parts by weight: 150 parts of N-methyl pyrrolidone, 7 parts of polyvinylidene fluoride and 3 parts of graphene; the thickness of the conductive adhesive layer is 0.5 mm; the graphite sheet layer is 100-mesh graphite sheet.
Example 4
The preparation method of the polar plate comprises the following steps: adding a conductive additive into a polyethylene base material, and uniformly mixing by adopting a rotary stirring mode to obtain a polyethylene conductive substrate mixture; feeding the mixture of the polyethylene conductive substrate into a co-rotating double-screw extruder, carrying out hot melting, mixing and extruding, extruding a polyethylene conductive substrate sheet, and cooling and forming to obtain a polyethylene conductive substrate layer; preparing an N-methyl pyrrolidone solution containing polyvinylidene fluoride according to a proportion, adding graphene into the N-methyl pyrrolidone solution according to the proportion, and performing rotary stirring to obtain a conductive adhesive material layer; coating a conductive adhesive layer on the polyethylene conductive substrate layer by using a coating machine; the graphite sheet layer is aired and scattered on the polyethylene conductive substrate layer coated with the conductive adhesive layer, and the graphite sheet layer is bonded on the polyethylene conductive substrate layer through the conductive adhesive layer; and bonding silica gel on the graphite sheet layer, wherein the graphite sheet layer is opposite to the conductive adhesive layer, bonding the silica gel on the polyethylene conductive substrate layer, performing hot-press bonding and cooling forming, and removing the silica gel to obtain the polar plate.
Example 5
The preparation method of the polar plate comprises the following steps: mixing conductive carbon black, graphite, carbon nanotubes and carbon fiber powder, and premixing the mixture to be uniform by adopting a rotary stirring mode to be used as a conductive additive; adding a conductive additive into a polyethylene base material, and uniformly mixing by adopting a rotary stirring mode to obtain a polyethylene conductive substrate mixture; feeding the mixture of the polyethylene conductive substrate into a co-rotating double-screw extruder, carrying out hot melting, mixing and extruding, extruding a polyethylene conductive substrate sheet, and cooling and forming to obtain a polyethylene conductive substrate layer; preparing an N-methyl pyrrolidone solution containing polyvinylidene fluoride according to a proportion, adding graphene into the N-methyl pyrrolidone solution according to the proportion, and performing rotary stirring to obtain a conductive adhesive material layer; polishing and cleaning the surface of a polyethylene conductive substrate layer by using 400-mesh sand paper, and coating a conductive adhesive layer on the polyethylene conductive substrate layer by using a coating machine; uniformly drying the graphite sheet layer by using an 80-mesh screen on a polyethylene conductive substrate layer coated with a conductive adhesive layer, bonding silica gel on the graphite sheet layer, back to the conductive adhesive layer, bonding the silica gel on the polyethylene conductive substrate layer, placing the whole body in a mold with fixed thickness after the silica gel is bonded, placing the mold in a flat vulcanizing instrument for hot-press bonding and cooling forming, opening the mold after the cooling forming, and removing the silica gel to obtain the polar plate.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, those skilled in the art will appreciate that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The preparation method of the polar plate is characterized in that the polar plate comprises the following steps: the conductive polyethylene substrate layer, the conductive adhesive layer and the graphite sheet layer;
the conductive sizing material layer is coated on the polyethylene conductive substrate layer; the graphite sheet layer is bonded with the polyethylene conductive substrate layer through the conductive adhesive layer;
the conductive adhesive layer is composed of the following raw materials in parts by weight: 100 parts of N-methyl pyrrolidone, 5 parts of polyvinylidene fluoride and 1 part of graphene;
the graphite sheet layer is made of 80-120-mesh graphite sheets;
the thickness of the conductive adhesive layer is 0.4-0.7 mm;
the preparation method of the polar plate comprises the following steps:
and step S1: adding a conductive additive into a polyethylene base material, and uniformly mixing by adopting a rotary stirring mode to obtain a polyethylene conductive substrate mixture;
and step S2: feeding the polyethylene conductive substrate mixture into a co-rotating double-screw extruder, carrying out hot melting, mixing and extruding, extruding a polyethylene conductive substrate sheet, and cooling and forming to obtain a polyethylene conductive substrate layer;
and step S3: preparing an N-methyl pyrrolidone solution containing polyvinylidene fluoride according to a proportion, adding graphene into the N-methyl pyrrolidone solution according to the proportion, and performing rotary stirring to obtain a conductive adhesive material layer;
and step S4: coating the conductive glue layer on the polyethylene conductive substrate layer by using a coating machine;
and step S5: sun-drying a graphite sheet layer on the polyethylene conductive substrate layer coated with the conductive adhesive layer, wherein the graphite sheet layer is bonded on the polyethylene conductive substrate layer through the conductive adhesive layer;
and step S6: bonding silica gel on the graphite sheet layer, wherein the graphite sheet layer is back to the conductive adhesive layer, bonding the silica gel on the polyethylene conductive substrate layer, and removing the silica gel after hot-press bonding and cooling forming to obtain the polar plate;
in the step S4, before the conductive adhesive layer is coated on the polyethylene conductive substrate layer, the polyethylene conductive substrate layer is surface-polished and cleaned by 400-sand paper and 600-mesh sand paper; and the number of the first and second groups,
in the step S5, the graphite sheet layer is uniformly applied to the polyethylene conductive substrate layer coated with the conductive paste layer by using an 80-100 mesh screen.
2. The method of manufacturing an electrode plate according to claim 1, wherein before the step of S1, the method further comprises:
mixing conductive carbon black, graphite, carbon nanotubes and carbon fiber powder, and premixing the mixture uniformly by adopting a rotary stirring mode to obtain the conductive additive.
3. The method for preparing the electrode plate according to claim 1, wherein in the step S2, when the polyethylene conductive substrate mixture is subjected to hot-melt mixing extrusion, the extrusion temperature is 200-250 ℃, the extrusion pressure is 15-20MPa, and the rotation speed of the co-rotating twin-screw extruder is 250-300 rpm;
when the polyethylene conductive substrate sheet is cooled and formed, the polyethylene conductive substrate sheet is cooled and rolled and formed by a calender roll, the temperature of the calender roll is 80-90 ℃, the roll speed is controlled at the online speed of 4-8m/min, and the polyethylene conductive substrate layer is obtained by shearing according to the size requirement.
4. The method for manufacturing an electrode plate according to claim 1, wherein in the step S6, the process of obtaining the electrode plate is:
after the silica gel is bonded, the whole is placed in a mold with a fixed thickness, the mold is placed in a flat vulcanizing instrument for hot-press bonding and cooling forming, after cooling forming, the mold is opened, and the silica gel is removed, so that the polar plate is obtained.
5. The method as claimed in claim 4, wherein the hot pressing temperature is 140-170 ℃, the hot pressing pressure is 40-60kg/cm2, and the hot pressing time is 200-300 s; and the number of the first and second groups,
when the flat vulcanizing machine is used for cooling and forming, the cooling pressure is 40-60kg/cm2, the cooling temperature is 25-30 ℃, and the cooling time is 200-300 s.
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