CN1417879A - Carbon fiber paper material for gas diffusing layer of fuel cell electrode and its prepn - Google Patents
Carbon fiber paper material for gas diffusing layer of fuel cell electrode and its prepn Download PDFInfo
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- CN1417879A CN1417879A CN01132156A CN01132156A CN1417879A CN 1417879 A CN1417879 A CN 1417879A CN 01132156 A CN01132156 A CN 01132156A CN 01132156 A CN01132156 A CN 01132156A CN 1417879 A CN1417879 A CN 1417879A
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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
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Abstract
A carbon fiber paper material for gas diffusing layer of fuel cell electrode is made of short high-carbon fiber as papermaking pulp and features the carbon fiber length of 0.5-5.0 mm, average length of 1.0-3.0 mm, and content of 96-99 wt%. The high-carbon fiber of different length are superposed each other to form excellent conducting system and homogeneously distributed pores for gas to diffuse. The present invention has excellent performance in resistivity, air gap rate, homogeneity, etc. The present invention also provides the preparation process of the said carbon fiber paper material.
Description
Technical field
The present invention relates to a kind of electrode material, relate in particular to a kind of carbon fiber paper material that is applicable to gas diffusing layer of fuel cell electrode, also relate to the preparation method of this kind carbon fiber paper material.
Background technology
It is the diffusion layer electrode material that the electrode of present used in proton exchange membrane fuel cell mostly adopts porous carbon paper or carbon cloth, and its effect is the passing away that reacting gas, electron stream and superfluous water are provided on the one hand, supports platinum/C catalyst network on the other hand.Therefore, the permeability of this carbon paper or carbon cloth and conductivity are bigger to the performance impact of electrode and even battery.The existing carbon paper that is used for electrode diffusion layer both at home and abroad mainly is the composite carbon paper material, but it mix mutually by carbon fibres such as carbon fiber, wood pulp, cellulose fibre or polyvinyl alcohol short fibers, make paper pulp, make carbon paper then.The carbon paper that this technology makes, because it in order to guarantee the intensity of carbon paper, has added more non-conductive material therein, its carbon fiber content all is lower than 90%, therefore, causes resistivity bigger, porosity and structure thereof are reasonable inadequately.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of carbon fiber content to be higher than 90% the carbon fiber paper material that is used for electric pole gaseous diffusion layer, this material has good electrical conductivity, and its resistivity is low, even pore distribution.
Another object of the present invention is to provide a kind of method for preparing above-mentioned carbon fiber paper material, utilize the carbon fiber paper material of this method preparation to have good electrical conductivity, its resistivity is low, even pore distribution.
According to above-mentioned purpose of the present invention, the carbon fiber paper material that is used for gas diffusing layer of fuel cell electrode provided by the invention, with the high carbon fiber of weak point (cutting) is the papermaking pulp-liquor raw material, it is characterized in that, this short high-carbon fibers length distribution is between 0.5 millimeter to 5.0 millimeters, its average length is between 1.0 millimeters to 3.0 millimeters, and its content accounts for percentage by weight 96% to 99%.
According to an aspect of the present invention, in described carbon fiber paper material, the resistivity of described high carbon fiber is 0.001 to 0.02 Ω .cm.
According to another aspect of the present invention, in described carbon fiber paper material, described high carbon fiber is one of polyacrylonitrile-based carbon fibre and asphalt base carbon fiber or its combination.
According to a further aspect of the invention, in described carbon fiber paper material, the area weight of described carbon fiber paper is 50 to 150g/M
2
The present invention also provides a kind of method for preparing above-mentioned carbon fiber paper material, comprises the following steps:
A. prepare high carbon fiber;
B. described high carbon fiber is prescinded, the length of the high carbon fiber of weak point after this prescinds is between 0.5 millimeter to 5.0 millimeters, and its average length is between 1.0 millimeters to 3.0 millimeters;
C. select for use less than 1% dispersant described short high-carbon fiber dispersion in aqueous phase, form the slurries raw material, the content of wherein said high carbon fiber is between 96% to 99% percentage by weight;
D. utilize the wet papermaking method of forming to make carbon fiber paper material.
According to an aspect of the present invention, the resistivity of described high carbon fiber is 0.001 to 0.02 Ω .cm.
According to another aspect of the present invention, described high carbon fiber is one of polyacrylonitrile-based carbon fibre and asphalt base carbon fiber or its combination.
The area weight of described carbon fiber paper is 50 to 150g/M according to a further aspect of the invention
2
As mentioned above, owing in carbon fiber paper material of the present invention, comprised the high carbon fiber of weak point of different length, overlapped the twining of the short fiber of these different length closed, form good conduction system, has the hole that is evenly distributed again, guarantee the even diffusion of gas, overcome the shortcoming of the aspects such as carbon paper resistivity, porosity and the uniformity of traditional electrode gas diffusion layers.
Below, will describe the present invention in detail by specific embodiment.
Embodiment
The act as a fuel carbon fiber paper of battery electrode diffusion layer material, its Main physical index is exactly resistivity and porosity.Resistivity is low, and porosity is big and even, just can make fuel gas evenly disperse to pass through, and the internal resistance of battery component also will reduce, thereby improves current density.The resistivity and the porosity index that influence carbon fiber paper material have many factors, as, the resistivity of the carbon fiber of selecting for use itself, the length of carbon fiber and distribution situation thereof, the kind of carbon fiber, the surface condition of carbon fiber and binding characteristic, area weight and thickness or the like.Study for a long period of time through the inventor, wherein, the content of carbon fiber, the length of carbon fiber and distribution thereof are principal elements.
Therefore, the result of study at above-mentioned it is considered herein that, traditional carbon paper generally adopts the short fiber of equal length, therefore, must add organic fiber when the preparation carbon paper, so that improve the intensity of the carbon paper that makes.And the adding of organic fiber will inevitably influence the resistivity of carbon paper, and resistivity is improved, and simultaneously, also can cause the porosity of carbon paper to reduce skewness.
According to above-mentioned design of the present invention, the carbon fiber paper material that is used for gas diffusing layer of fuel cell electrode provided by the invention, except selecting high carbon fiber for use, also this fiber is handled, being about to high carbon fiber lacks and cuts, make its distribution of lengths between 0.5 millimeter to 5.0 millimeters, control its average length simultaneously between 1.0 millimeters to 3.0 millimeters.Owing to selected the carbon fiber of different length for use, overlapped the twining of the short fiber of these different length closed, the intensity of the carbon fiber paper that the energy assurance makes, thereby do not need as traditional preparation method, must add organic fiber, can improve the content (in the present invention can reach 96% to 99% percentage by weight) of carbon fiber in carbon fiber paper, form good conduction system, have the hole that is evenly distributed again, guaranteed the even diffusion of gas.
Be the processing step of preparation carbon fiber paper material of the present invention below:
At first, select high carbon fiber filament; In the present invention, be to have good electrical conductivity for the requirement of high carbon fiber, therefore, preferably, require its resistivity at 0.001 to 0.02 Ω .cm.The high carbon fiber that meets this requirement comprises polyacrylonitrile-based carbon fibre and asphalt base carbon fiber.When selecting for use, can select to use wherein a kind of fiber, also two kinds of carbon fibers can be mixed and select for use.
Secondly, carbon fiber filament lacked cut processing, that is,, and make its distribution of lengths between 0.5 millimeter to 5.0 millimeters, control its average length simultaneously between 1.0 millimeters to 3.0 millimeters the fiber filament cutting short-forming fiber;
Then, the high carbon fiber after prescinding is sent to the aqueous phase that contains dispersant, carbon fiber is evenly disperseed.Dispersant can be selected polyvinyl alcohol, poly-propionamide etc. for use, and its addition is less than 1%, and the content of high carbon fiber is controlled between 95% to 99% percentage by weight, and wherein optimum value is 98% to 99%;
At last, the papermaking pulp-liquor that will make in previous step makes carbon fiber paper material by the wet papermaking method of forming.The relevant wet papermaking method of forming is traditional method, therefore, at this no longer to its specific descriptions.
What need supplementary notes is, in above-mentioned preparation process, also can control the area weight of carbon fiber paper material, generally it is controlled at 50 to 150g/M
2But should be appreciated that this control is not is that the present invention is necessary, in the present invention, also can adopt traditional area weight fully.
At aforesaid carbon fiber paper material that is used for gas diffusing layer of fuel cell electrode of the present invention and preparation method thereof, owing to utilized the technology of carbon fiber length combination, therefore, in preparation process, do not need to add the organic fiber that influences conductivity, thereby can improve the content of the carbon fiber in the carbon fiber paper greatly, can reach 96% to 99% (and in traditional carbon paper, content is generally all less than 90%), improve the conductivity of carbon fiber paper.
Below, be several instantiation of the present invention.
Example 1:
Select polyacrylonitrile-based carbon fibre for use,, put into cutting machine and prescind to a few minutes through air oxidation pre-treatment several seconds, make its distribution of lengths between 0.5 millimeter to 5.0 millimeters, its concrete distributed data is as follows:
1 millimeters long accounts for 49%; 2 millimeters long account for 32%; 3 millimeters long account for 14%; 5 millimeters long account for 5%.Its average length is 1.8 millimeters.
Put into the aqueous phase that contains 0.5% dispersant then, stir, obtain papermaking pulp-liquor.Wherein dispersant is selected polyvinyl alcohol for use.
At last, utilize traditional wet papermaking method of forming to make carbon fiber paper material, the compacting of dry back obtains carbon fiber paper material.Some performance index of the carbon fiber paper material that makes in this example are as follows:
Area weight is 98g/M
2Thickness is 0.25 millimeter; Porosity is 80%; Density is 0.5g/cm
3Resistivity is 0.060 Ω .cm.
Example 2:
Select polyacrylonitrile-based carbon fibre for use,, put into cutting machine and prescind to a few minutes through air oxidation pre-treatment several seconds, make its distribution of lengths between 0.5 millimeter to 5.0 millimeters, its concrete distributed data is as follows:
1 millimeters long accounts for 1%; 2 millimeters long account for 54%; 3 millimeters long account for 29%; 5 millimeters long account for 6%.Its average length is 2.36 millimeters.
Put into the aqueous phase that contains 0.5% dispersant then, stir, obtain papermaking pulp-liquor.Wherein dispersant is selected polyvinyl alcohol for use.
At last, utilize traditional wet papermaking method of forming to make carbon fiber paper material, the compacting of dry back obtains carbon fiber paper material.Some performance index of the carbon fiber paper material that makes in this example are as follows:
Area weight is 100g/M
2Thickness is 0.25 millimeter; Porosity is 78%; Density is 0.48g/cm
3Resistivity is 0.065 Ω .cm.
Claims (8)
1, a kind of carbon fiber paper material that is used for gas diffusing layer of fuel cell electrode, with short high carbon fiber is the papermaking pulp-liquor raw material, it is characterized in that, this short high-carbon fibers length distribution is between 0.5 millimeter to 5.0 millimeters, its average length is between 1.0 millimeters to 3.0 millimeters, and its content accounts for percentage by weight 96% to 99%.
2, the carbon fiber paper material that is used for gas diffusing layer of fuel cell electrode as claimed in claim 1 is characterized in that, the resistivity of described high carbon fiber is 0.001 to 0.02 Ω .cm.
3, the carbon fiber paper material that is used for gas diffusing layer of fuel cell electrode as claimed in claim 1 or 2 is characterized in that, described high carbon fiber is one of polyacrylonitrile-based carbon fibre and asphalt base carbon fiber or its combination.
4, the carbon fiber paper material that is used for gas diffusing layer of fuel cell electrode as claimed in claim 1 or 2 is characterized in that, the area weight of described carbon fiber paper is 50 to 150g/M
2
5, a kind of preparation comprises the following steps: as the method for the described carbon fiber paper material of claim 1 to 4
A. prepare high carbon fiber;
B. described high carbon fiber is prescinded, the length of the high carbon fiber of weak point after this prescinds is between 0.5 millimeter to 5.0 millimeters, and its average length is between 1.0 millimeters to 3.0 millimeters;
C. select for use less than 1% dispersant described short high-carbon fiber dispersion in aqueous phase, form the slurries raw material, the content of wherein said high carbon fiber is between 96% to 99% percentage by weight;
D. utilize the wet papermaking method of forming to make carbon fiber paper material.
6. the preparation method of carbon fiber paper material as claimed in claim 5 is characterized in that, the resistivity of described high carbon fiber is 0.001 to 0.02 Ω .cm.
7. as the preparation method of claim 5 or 6 described carbon fiber paper materials, it is characterized in that described high carbon fiber is one of polyacrylonitrile-based carbon fibre and asphalt base carbon fiber or its combination.
8. as the preparation method of claim 5 or 6 described carbon fiber paper materials, it is characterized in that the area weight of described carbon fiber paper is 50 to 150g/M
2
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011321563A CN1185736C (en) | 2001-11-09 | 2001-11-09 | Carbon fiber paper material for gas diffusing layer of fuel cell electrode and its prepn |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011321563A CN1185736C (en) | 2001-11-09 | 2001-11-09 | Carbon fiber paper material for gas diffusing layer of fuel cell electrode and its prepn |
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| Publication Number | Publication Date |
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| CN1417879A true CN1417879A (en) | 2003-05-14 |
| CN1185736C CN1185736C (en) | 2005-01-19 |
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| CNB011321563A Expired - Fee Related CN1185736C (en) | 2001-11-09 | 2001-11-09 | Carbon fiber paper material for gas diffusing layer of fuel cell electrode and its prepn |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101591868B (en) * | 2009-06-23 | 2011-04-27 | 东华大学 | Preparation for carbon fiber paper used for gas diffusion layer of proton exchange membrane fuel cell |
| CN104009245A (en) * | 2014-06-10 | 2014-08-27 | 江苏绿遥燃料电池系统制造有限公司 | Preparation method of gas diffusion layer embryo body for fuel cell |
| CN105722787A (en) * | 2013-11-13 | 2016-06-29 | 本田技研工业株式会社 | Carbon fiber membrane |
| CN106450376A (en) * | 2016-09-13 | 2017-02-22 | 深圳市德方纳米科技股份有限公司 | Low-resistivity conductive carbon thin film and preparation method thereof |
| CN109860635A (en) * | 2019-02-22 | 2019-06-07 | 成都新柯力化工科技有限公司 | A kind of preparation method of new energy battery special-purpose metal net base carbon fibre paper |
| CN109863631A (en) * | 2016-12-29 | 2019-06-07 | 可隆工业株式会社 | Produce the method with the rolling gas diffusion layers of excellent deployment characteristics |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100415987C (en) * | 2006-07-05 | 2008-09-03 | 浙江省普瑞科技有限公司 | A porous carbon fiber paper for fuel cell with proton exchange membrane and preparation method thereof |
-
2001
- 2001-11-09 CN CNB011321563A patent/CN1185736C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101591868B (en) * | 2009-06-23 | 2011-04-27 | 东华大学 | Preparation for carbon fiber paper used for gas diffusion layer of proton exchange membrane fuel cell |
| CN105722787A (en) * | 2013-11-13 | 2016-06-29 | 本田技研工业株式会社 | Carbon fiber membrane |
| US10020123B2 (en) | 2013-11-13 | 2018-07-10 | Honda Motor Co., Ltd. | Carbon fiber membrane |
| CN108538627A (en) * | 2013-11-13 | 2018-09-14 | 本田技研工业株式会社 | Carbon-fiber film |
| CN108538627B (en) * | 2013-11-13 | 2020-08-07 | 本田技研工业株式会社 | Carbon fiber film |
| CN104009245A (en) * | 2014-06-10 | 2014-08-27 | 江苏绿遥燃料电池系统制造有限公司 | Preparation method of gas diffusion layer embryo body for fuel cell |
| CN104009245B (en) * | 2014-06-10 | 2016-03-02 | 江苏绿遥燃料电池系统制造有限公司 | A kind of preparation method of gas diffusion layer for fuel cell idiosome |
| CN106450376A (en) * | 2016-09-13 | 2017-02-22 | 深圳市德方纳米科技股份有限公司 | Low-resistivity conductive carbon thin film and preparation method thereof |
| CN109863631A (en) * | 2016-12-29 | 2019-06-07 | 可隆工业株式会社 | Produce the method with the rolling gas diffusion layers of excellent deployment characteristics |
| CN109860635A (en) * | 2019-02-22 | 2019-06-07 | 成都新柯力化工科技有限公司 | A kind of preparation method of new energy battery special-purpose metal net base carbon fibre paper |
| CN109860635B (en) * | 2019-02-22 | 2021-09-03 | 成都新柯力化工科技有限公司 | Preparation method of metal mesh-based carbon fiber paper special for new energy battery |
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| CN1185736C (en) | 2005-01-19 |
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