CN113594487A - Bipolar plate and preparation method thereof - Google Patents
Bipolar plate and preparation method thereof Download PDFInfo
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- CN113594487A CN113594487A CN202110867570.0A CN202110867570A CN113594487A CN 113594487 A CN113594487 A CN 113594487A CN 202110867570 A CN202110867570 A CN 202110867570A CN 113594487 A CN113594487 A CN 113594487A
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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
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0223—Composites
- H01M8/0226—Composites in the form of mixtures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
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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
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0213—Gas-impermeable carbon-containing materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5808—Measuring, controlling or regulating pressure or compressing force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5816—Measuring, controlling or regulating temperature
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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 provides a bipolar plate which comprises the following raw materials in parts by weight: 20-117 parts of titanium carbide; 7-10 parts of graphite; 0-3 parts of carbon black; 0-87 parts of composite polymer filler, the raw materials in the specific proportion can realize the construction of a three-dimensional conductive network through hot pressing to prepare the bipolar plate with good comprehensive performance, high conductivity and corrosion resistance and sealing performance.
Description
Technical Field
The invention relates to a conductive composite material, in particular to a bipolar plate and a preparation method thereof.
Background
Proton Exchange Membrane Fuel Cells (PEMFCs) have high energy density, good response to various loads, low-temperature operation, and rapid start-up capability, and thus are considered as a potential new energy power generation device. PEMFCs are the most common fuel cells and are the mainstay of fuel cell applications. Bipolar plates are one of the most extensively studied components in fuel cells. Bipolar plates have important functions in a cell stack: the fuel gas and oxygen are uniformly distributed, collecting and conducting current from the anode to the cathode of the next connected cell to integrate into a fuel cell stack that meets voltage requirements, supporting the Membrane Electrode Assembly (MEA) by proper internal water management, heat dissipation, and by maintaining clamping pressure. The development of fuel cell bipolar plates is becoming a key to the research in the fuel cell industry.
Currently, bipolar plates are classified into metal bipolar plates, graphite bipolar plates, and composite bipolar plates according to the difference of the materials to be prepared. The metal plate is punched to form the bipolar plate with flow channels, which is called a metal bipolar plate, the protective coating is obtained through surface modification, but under long-term severe working conditions, the coating can be corroded to lose the protection effect. The graphite bipolar plate is a bipolar plate formed by graphitizing high-density graphite at high temperature and high pressure and forming a gas flow channel through mechanical processing, and has the advantages of long service life, brittle graphite, high processing technology requirement, and high preparation difficulty and cost. The composite bipolar plate is formed by one-step molding of prepreg formed by mixing resin with graphite powder and reinforcing material through injection or die pressing, and has good comprehensive performance, better conductivity, corrosion resistance, bending resistance, compression resistance and other mechanical properties. In the preparation of the composite bipolar plate, the compression molding process has wider application compared with an injection molding process, and a hydraulic press and a mold are mainly utilized to heat and pressurize the uniformly mixed mixture of the conductive filler and the resin, accelerate the resin curing and material shaping, and remove the film to obtain the bipolar plate with the specified shape and flow channel. The equipment required by the die pressing process is simple, the requirement on material fluidity is low, and the prepared bipolar plate has high density, accurate size, small shrinkage and good performance. In addition, the runner is directly formed in the mould pressing process, a machining procedure is not needed, batch production can be realized, the production period is short, and the production efficiency is high. The carbon-based composite bipolar plate is a composite bipolar plate which is researched more in recent years, graphite is used as a main conductive filler, a thermosetting or thermoplastic resin adhesive and a chemical auxiliary agent are matched, and the composite bipolar plate is molded under the heating and pressurizing conditions, so that the defects of high brittleness and poor mechanical property of a pure graphite bipolar plate are overcome, but the conductivity is inferior to that of the graphite bipolar plate; is more corrosion resistant than a metal bipolar plate, and has better air tightness than the metal bipolar plate.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the bipolar plate in the prior art is difficult to combine high conductivity, corrosion resistance and sealing performance, thereby providing the bipolar plate and the preparation method thereof.
Therefore, the invention provides the following technical scheme:
a bipolar plate comprises the following raw materials in parts by weight:
the composite polymeric filler comprises at least one of polyethylene, polyamide, polysiloxane, polyetheretherketone, polyimide, polyphenylene sulfide, or polybenzimidazole.
Optionally, the distribution of the graphite particle size is as follows: the particle size of 95 percent of the graphite particles is less than 75 mu m, the particle size of 50 percent of the graphite particles is less than 25 mu m, and the particle size of 20 percent of the graphite particles is less than 15 mu m; the specific surface area of the graphite particles is 300-600m2/g。
Optionally, the distribution of the carbon black particle size is as follows: the grain diameter of 95 percent of the carbon black grains is less than 50 mu m, the grain diameter of 50 percent of the carbon black grains is less than 15 mu m, and the grain diameter of 20 percent of the carbon black grains is less than 5 mu m; the specific surface area of the carbon black particles is 100-500m2/g。
Optionally, the titanium carbide has the following particle size distribution: the grain size of 95% of the titanium carbide grains is less than 150 μm, the grain size of 50% of the titanium carbide grains is less than 65 μm, and the grain size of 20% of the titanium carbide grains is less than 25 μm.
The invention provides a preparation method of the bipolar plate, which comprises the following steps:
preparing titanium carbide, graphite, carbon black and composite polymer filler into a prefabricated body according to a formula;
and heating and pressurizing the obtained prefabricated body to prepare the bipolar plate.
Optionally, before the step of preparing the preform, adding mixed powder of titanium carbide and graphite into the organic solution in advance, uniformly mixing and drying; since the mixed powder of titanium carbide and graphite is liable to generate heat, wet mixing and drying are selected.
Optionally, the organic solution is a mixture of dimethyl sulfoxide and ethanol;
optionally, the volume ratio of the dimethyl sulfoxide to the ethanol is 1: 1.2-1: 2.0;
optionally, the mass ratio of the organic solution to the mixed powder is 4: 1-8: 1.
Optionally, in the step of preparing the preform, the raw materials are ball-milled and mixed, and the ball-milling conditions are as follows: the ball-material ratio is 1: 1, the rotating speed is 200-.
Optionally, the heating temperature is 160-220 ℃, and the heating time is 12-15 min.
Optionally, the heating step adopts a gradient temperature program for heating, and the gradient temperature program is as follows: after the room temperature rises to 160-220 ℃, the temperature is preserved for 12-15 minutes, and then the temperature is slowly reduced to 100-105 ℃ at the temperature reduction rate of less than or equal to 3K/min.
Optionally, the pressurizing condition is 10 bar-40 bar;
optionally, the pressurizing step is performed by a gradient pressure-changing program, which is as follows: opening the mold for 7-17 seconds, feeding for 20-30 seconds, closing the mold for 10-20 seconds, raising the pressure from zero to 10-40 bar, curing for 73-120 seconds, opening the mold and taking out.
The technical scheme of the invention has the following advantages:
1. the invention provides a bipolar plate which comprises the following raw materials in parts by weight: 20-117 parts of titanium carbide; 7-10 parts of graphite; 0-3 parts of carbon black; 0-87 parts of composite polymer filler, the raw materials in the specific proportion can realize the construction of a three-dimensional conductive network through hot pressing to prepare the bipolar plate with good comprehensive performance, high conductivity and corrosion resistance and sealing performance.
2. The invention provides a bipolar plate, which is characterized in that the particle size distribution of graphite is as follows: the particle size of 95 percent of the graphite particles is less than 75 mu m, the particle size of 50 percent of the graphite particles is less than 25 mu m, and the particle size of 20 percent of the graphite particles is less than 15 mu m; the particle diameter ratio of the graphite is 300-600m2(ii)/g; by selecting the graphite with the particle size distribution and the specific surface area, the graphite can be matched with other raw materials in size grade, and the conductivity is comprehensively improved through the appearance of each raw material, the connection mode among the raw materials influencing electron transmission and the structure of each raw material.
3. The invention provides a bipolar plate, wherein the particle size distribution of carbon black is as follows: the grain diameter of 95 percent of the carbon black grains is less than 50 mu m, the grain diameter of 50 percent of the carbon black grains is less than 15 mu m, and the grain diameter of 20 percent of the carbon black grains is less than 5 mu m; the specific surface area of the carbon black particles is 100-500m2(ii)/g; the carbon black with the particle size distribution and the specific surface area is selected, so that the carbon black can be matched with other raw materials in size grade, and the conductivity is comprehensively improved through the appearance of each raw material, the connection mode among the raw materials influencing electronic transmission and the structure of each raw material.
4. The invention provides a bipolar plate, wherein the titanium carbide has the following particle size distribution: the grain size of 95 percent of the titanium carbide grains is less than 150 mu m, the grain size of 50 percent of the titanium carbide grains is less than 65 mu m, and the grain size of 20 percent of the titanium carbide grains is less than 25 mu m; by selecting the titanium carbide with the grain size distribution, the titanium carbide can be matched with other raw materials in size grade, and the conductivity is comprehensively improved through the appearance of each raw material, the connection mode among the raw materials influencing electron transmission and the structure of each raw material.
5. The preparation method of the bipolar plate provided by the invention has a simple process, and can further improve the conductivity, the corrosion resistance and the sealing property of the prepared bipolar plate by controlling the heating condition and the pressurizing condition.
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 shows the results of current density tests of the bipolar plate of the present invention and commercial quartz and composite plates in test example 2 of the present invention.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
The formulation of a bipolar plate provided in this example:
the composite polymer filler comprises 10kg of polyethylene, 10kg of polyamide, 10kg of polysiloxane, 10kg of polyether ether ketone, 10kg of polyimide, 20kg of polyphenylene sulfide and 17kg of polybenzimidazole.
The distribution of the graphite particle size is as follows: 95% of the graphite particlesThe grain diameter is less than 75 mu m, the grain diameter of 50 percent of grains is less than 25 mu m, and the grain diameter of 20 percent of grains is less than 15 mu m; the specific surface area of the graphite particles is 600m2/g。
The distribution of the carbon black particle size is as follows: the grain diameter of 95 percent of the carbon black grains is less than 50 mu m, the grain diameter of 50 percent of the carbon black grains is less than 15 mu m, and the grain diameter of 20 percent of the carbon black grains is less than 5 mu m; the specific surface area of the carbon black particles is 500m2/g。
The particle size distribution of titanium carbide is as follows: the grain size of 95% of the titanium carbide grains is less than 150 μm, the grain size of 50% of the titanium carbide grains is less than 65 μm, and the grain size of 20% of the titanium carbide grains is less than 25 μm.
The preparation method comprises the following steps:
(1) adding the mixed powder of graphite and titanium carbide particles into a mixed solution of dimethyl sulfoxide and ethanol, uniformly mixing, and drying in a vacuum oven; the volume ratio of the dimethyl sulfoxide to the ethanol is 1: 1.2; the mass ratio of the organic solution to the mixed powder is 8: 1;
(2) preparing a prefabricated body of titanium carbide, graphite and a composite filler, adding mixed powder of the titanium carbide, the graphite and the composite filler into a ball mill for ball milling and mixing, wherein the ball milling and mixing conditions are as follows: selecting a zirconia ball milling tank and grinding beads, wherein the ball-material ratio is 1: 1, the rotating speed is 200rmp, and performing forward and reverse circulation intermittent ball milling for at least 420 minutes;
(3) then pressing the bipolar plate under the heating and pressurizing conditions, and heating the bipolar plate by adopting a gradient temperature changing program, wherein the gradient temperature changing program comprises the following steps: after the room temperature (25 ℃) is increased to 160 ℃, the temperature is kept for 12 minutes, and then the temperature is slowly reduced to 100 ℃ at the cooling rate of 3K/min; then sending the mixture under the temperature condition into a molding press, wherein the specific steps are as follows: opening the mould for 7 seconds, feeding for 20 seconds, closing the mould for 10 seconds, increasing the pressure from zero to 35bar, curing for 73 seconds, opening the mould and taking out.
Example 2
The formulation of a bipolar plate provided in this example:
the composite polymeric filler comprises at least one of polyethylene, polyamide, polysiloxane, polyetheretherketone, polyimide, polyphenylene sulfide, or polybenzimidazole.
The distribution of the graphite particle size is as follows: the particle size of 95 percent of the graphite particles is less than 75 mu m, the particle size of 50 percent of the graphite particles is less than 25 mu m, and the particle size of 20 percent of the graphite particles is less than 15 mu m; the specific surface area of the graphite particles is 400m2/g。
The distribution of the carbon black particle size is as follows: the grain diameter of 95 percent of the carbon black grains is less than 50 mu m, the grain diameter of 50 percent of the carbon black grains is less than 15 mu m, and the grain diameter of 20 percent of the carbon black grains is less than 5 mu m; the specific surface area of the carbon black particles is 300m2/g。
The particle size distribution of titanium carbide is as follows: the grain size of 95% of the titanium carbide grains is less than 150 μm, the grain size of 50% of the titanium carbide grains is less than 65 μm, and the grain size of 20% of the titanium carbide grains is less than 25 μm.
The preparation method comprises the following steps:
(1) adding the mixed powder of graphite and titanium carbide particles into a mixed solution of dimethyl sulfoxide and ethanol, uniformly mixing, and drying in a vacuum oven; the volume ratio of the dimethyl sulfoxide to the ethanol is 1: 2.0; the mass ratio of the organic solution to the mixed powder is 4: 1;
(2) preparing a prefabricated body of titanium carbide, graphite and carbon black, adding mixed powder of the titanium carbide, the graphite and the carbon black into a ball mill for ball milling and mixing, wherein the ball milling and mixing conditions are as follows: selecting a zirconia ball milling tank and grinding beads, wherein the ball-material ratio is 1: 1, the rotating speed is 300rmp, and performing forward and reverse circulation intermittent ball milling for at least 430 minutes;
(3) putting the powder into a mold, pressing the powder into a bipolar plate under the condition of heating and pressurizing, and heating the bipolar plate by adopting a gradient temperature change program which comprises the following steps: after the room temperature (25 ℃) is raised to 220 ℃, the temperature is preserved for 15 minutes, then the temperature is slowly reduced to 105 ℃ at the temperature reduction rate of less than or equal to 3K/min, and then the mixture with the temperature condition is sent into a molding press, and the concrete steps are as follows: opening the mould for 17 seconds, feeding for 30 seconds, closing the mould for 20 seconds, increasing the pressure from zero to 10bar, curing for 120 seconds, opening the mould and taking out.
Example 3
The formulation of a bipolar plate provided in this example:
the composite polymer filler comprises 8kg of polyethylene, 10kg of polyether-ether-ketone, 17kg of polyimide and 10kg of polyphenylene sulfide.
The distribution of the graphite particle size is as follows: the particle size of 95 percent of the graphite particles is less than 65 mu m, the particle size of 50 percent of the graphite particles is less than 15 mu m, and the particle size of 20 percent of the graphite particles is less than 5 mu m; the specific surface area of the graphite particles is 300m2/g。
The distribution of the carbon black particle size is as follows: the grain diameter of 95 percent of the carbon black grains is less than 45 mu m, the grain diameter of 50 percent of the carbon black grains is less than 10 mu m, and the grain diameter of 20 percent of the carbon black grains is less than 1 mu m; the specific surface area of the carbon black particles is 100m2/g。
The particle size distribution of titanium carbide is as follows: the grain diameter of 95 percent of the titanium carbide grains is less than 120 mu m, the grain diameter of 50 percent of the titanium carbide grains is less than 35 mu m, and the grain diameter of 20 percent of the titanium carbide grains is less than 5 mu m.
The preparation method comprises the following steps:
(1) adding the mixed powder of graphite and titanium carbide particles into a mixed solution of dimethyl sulfoxide and ethanol, uniformly mixing, and drying in a vacuum oven; the volume ratio of the dimethyl sulfoxide to the ethanol is 1: 1.6; the mass ratio of the organic solution to the mixed powder is 6: 1;
(2) preparing a prefabricated body of titanium carbide, graphite, carbon black and a composite filler, adding mixed powder of the titanium carbide, the graphite, the carbon black and the composite filler into a ball mill for ball milling and mixing, wherein the ball milling and mixing conditions are as follows: selecting a zirconia ball milling tank and grinding beads, wherein the ball-material ratio is 1: 1, the rotating speed is 250rmp, and the ball milling time is 450 minutes by adopting forward and reverse circulation intermittent ball milling;
(3) then pressing the bipolar plate under the heating and pressurizing conditions, and heating the bipolar plate by adopting a gradient temperature changing program, wherein the gradient temperature changing program comprises the following steps: after the room temperature (25 ℃) is increased to 190 ℃, preserving heat for 14 minutes, then slowly reducing the temperature to 103 ℃ at the cooling rate of 2K/min, and then sending the mixture with the temperature condition into a molding press, wherein the specific steps are as follows: opening the mould for 12 seconds, feeding for 25 seconds, closing the mould for 15 seconds, increasing the pressure from zero to 35bar, curing for 85 seconds, opening the mould and taking out.
Comparative example 1
The formulation of a bipolar plate provided in this example:
the composite polymer filler comprises 8kg of polyethylene, 10kg of polyether-ether-ketone, 17kg of polyimide and 10kg of polyphenylene sulfide.
In the formula, the particle size of the graphite is less than 75 μm, the particle size of the carbon black is less than 50 μm, and the particle size of the titanium carbide is less than 150 μm.
The preparation method comprises the following steps:
(1) adding the mixed powder of graphite and titanium carbide particles into dimethyl sulfoxide, adding the dimethyl sulfoxide into a proper amount of ethanol, uniformly mixing, and then drying in a vacuum oven; the volume ratio of the dimethyl sulfoxide to the ethanol is 1: 1.6; the mass ratio of the organic solution to the mixed powder is 6: 1;
(2) preparing a prefabricated body of titanium carbide, graphite, carbon black and a composite filler, adding the mixed powder into a ball mill for ball milling and mixing, wherein the ball milling and mixing conditions are as follows: selecting a zirconia ball milling tank and grinding beads, wherein the ball-material ratio is 1: 1, the rotating speed is 200rmp, and the ball milling time is at least more than 420 minutes by adopting forward and reverse circulation intermittent ball milling;
(3) then pressing the bipolar plate under the heating and pressurizing conditions, and heating the bipolar plate by adopting a gradient temperature changing program, wherein the gradient temperature changing program comprises the following steps: after the room temperature (25 ℃) is increased to 190 ℃, preserving heat for 14 minutes, then slowly reducing the temperature to 103 ℃ at the cooling rate of 2K/min, and then sending the mixture with the temperature condition into a molding press, wherein the specific steps are as follows: opening the mould for 12 seconds, feeding for 25 seconds, closing the mould for 15 seconds, increasing the pressure from zero to 35bar, curing for 85 seconds, opening the mould and taking out.
Test example 1
1. Electrical conductivity of
Conductivity measurements were made according to ASTM C611-98
The bipolar plates of examples 1 to 3 and the bipolar plate of comparative example 1 were subjected to conductivity measurement, and the junction was measured
As shown in table 1 below:
TABLE 1 conductivity
From the above, the bipolar plate prepared by the invention has very excellent conductivity which can reach 75.2S/cm.
2. Corrosion resistance
Measurement of Corrosion resistance measurement according to cyclic voltammetry
The bipolar plates of examples 1 to 3 and the bipolar plate of comparative example were subjected to corrosion resistance measurement, and the junction was measured
The results are shown in table 2 below:
TABLE 2 Corrosion resistance
| Corrosion resistance (. mu.A. cm)-2) | |
| Example 1 | 0.85 |
| Example 2 | 0.62 |
| Example 3 | 0.52 |
| Comparative example 1 | 1.04 |
As can be seen from the above, the bipolar plate prepared by the invention has strong corrosion resistance, and the lowest corrosion resistance can reach 0.52 muA cm-2。
3. Air tightness
Air tightness measurement was carried out according to ASTM D1434 standard
The bipolar plates of examples 1 to 3 and the bipolar plate of comparative example were subjected to airtightness measurement, and the results of the measurement were obtained
As in table 3 below:
TABLE 3 air tightness
| Example 1 | ＜1.1×10-14 |
| Example 2 | ＜1.3×10-14 |
| Example 3 | ＜0.9×10-14 |
| Comparative example 1 | ＜1.3×10-14 |
As can be seen from the above, the bipolar plate prepared by the invention has good air tightness which can reach less than 0.9 multiplied by 10 at least-14。
Test example 2
Current density measurements were taken for the bipolar plate, commercial graphite plate (available from Barrad), and commercial composite plate (available from Schunk) of example 1, according to ASTM C611-98, and the results are shown in FIG. 1, from which it can be seen that the current density of example 1 increased smoothly with potential, showing greater corrosion resistance, while the current density was significantly better than that of the commercial graphite plate and the commercial composite plate, indicating that the conductivity of the inventive bipolar plate is much improved over that of the commercial graphite plate and the commercial composite plate.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The bipolar plate is characterized by comprising the following raw materials in parts by weight:
the composite polymeric filler comprises at least one of polyethylene, polyamide, polysiloxane, polyetheretherketone, polyimide, polyphenylene sulfide, or polybenzimidazole.
2. The bipolar plate of claim 1, wherein the graphite particle size distribution is as follows: the particle size of 95 percent of the graphite particles is less than 75 mu m, the particle size of 50 percent of the graphite particles is less than 25 mu m, and the particle size of 20 percent of the graphite particles is less than 15 mu m; the specific surface area of the graphite particles is 300-600m2/g。
3. The bipolar plate of claim 1 or 2, wherein the carbon black has a particle size distribution as follows: the grain diameter of 95 percent of the carbon black grains is less than 50 mu m, the grain diameter of 50 percent of the carbon black grains is less than 15 mu m, and the grain diameter of 20 percent of the carbon black grains is less than 5 mu m; the specific surface area of the carbon black particles is 100-500m2/g。
4. A bipolar plate as claimed in any one of claims 1 to 3, wherein the titanium carbide has a particle size distribution as follows: the grain size of 95% of the titanium carbide grains is less than 150 μm, the grain size of 50% of the titanium carbide grains is less than 65 μm, and the grain size of 20% of the titanium carbide grains is less than 25 μm.
5. A method of manufacturing a bipolar plate as claimed in any one of claims 1 to 4, comprising the steps of:
preparing titanium carbide, graphite, carbon black and composite polymer filler into a prefabricated body according to a formula;
and heating and pressurizing the obtained prefabricated body to prepare the bipolar plate.
6. The method for preparing a bipolar plate according to claim 5, wherein before the step of preparing the preform, the method further comprises adding a mixed powder of titanium carbide and graphite into the organic solution in advance, mixing uniformly and then drying;
optionally, the organic solution is a mixture of dimethyl sulfoxide and ethanol;
optionally, the volume ratio of the dimethyl sulfoxide to the ethanol is 1: 1.2-1: 2.0;
optionally, the mass ratio of the organic solution to the mixed powder is 4: 1-8: 1.
7. The method of manufacturing a bipolar plate as claimed in claim 5 or 6, wherein in the step of preparing the preform, the raw materials are ball-milled and mixed under the following conditions: the ball-material ratio is 1: 1, the rotating speed is 200-.
8. The method for preparing a bipolar plate as claimed in claim 5 or 6, wherein the heating temperature is 160-220 ℃ and the heating time is 12-15 min.
9. The method of manufacturing a bipolar plate as claimed in claim 5 or 6, wherein the heating step is performed by a gradient temperature program comprising: after the room temperature rises to 160-220 ℃, the temperature is preserved for 12-15 minutes, and then the temperature is slowly reduced to 100-105 ℃ at the temperature reduction rate of less than or equal to 3K/min.
10. The method of manufacturing a bipolar plate as claimed in claim 5 or 6, wherein the pressurizing condition is 10 to 40 bar;
optionally, the pressurizing step is performed by a gradient pressure-changing program, which is as follows: opening the mold for 7-17 seconds, feeding for 20-30 seconds, closing the mold for 10-20 seconds, raising the pressure from zero to 10-40 bar, curing for 73-120 seconds, opening the mold and taking out.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113823807A (en) * | 2021-11-25 | 2021-12-21 | 北京理工大学深圳汽车研究院(电动车辆国家工程实验室深圳研究院) | Composition, composite conductive ceramic bipolar plate thereof and preparation method |
| CN116727205A (en) * | 2023-05-31 | 2023-09-12 | 麓丰新材料(广东)有限公司 | Corrosion prevention treatment method for metal bipolar plate |
Citations (1)
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| CN112290040A (en) * | 2020-10-30 | 2021-01-29 | 江苏清能新能源技术股份有限公司 | Preparation method of composite graphite bipolar plate |
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| CN112290040A (en) * | 2020-10-30 | 2021-01-29 | 江苏清能新能源技术股份有限公司 | Preparation method of composite graphite bipolar plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113823807A (en) * | 2021-11-25 | 2021-12-21 | 北京理工大学深圳汽车研究院(电动车辆国家工程实验室深圳研究院) | Composition, composite conductive ceramic bipolar plate thereof and preparation method |
| CN116727205A (en) * | 2023-05-31 | 2023-09-12 | 麓丰新材料(广东)有限公司 | Corrosion prevention treatment method for metal bipolar plate |
| CN116727205B (en) * | 2023-05-31 | 2024-04-02 | 麓丰新材料(广东)有限公司 | Corrosion prevention treatment method for metal bipolar plate |
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