JPH0415961B2 - - Google Patents
Info
- Publication number
- JPH0415961B2 JPH0415961B2 JP58015251A JP1525183A JPH0415961B2 JP H0415961 B2 JPH0415961 B2 JP H0415961B2 JP 58015251 A JP58015251 A JP 58015251A JP 1525183 A JP1525183 A JP 1525183A JP H0415961 B2 JPH0415961 B2 JP H0415961B2
- Authority
- JP
- Japan
- Prior art keywords
- fluororesin
- sheet
- conductive
- carbon paper
- powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 23
- 229910052799 carbon Inorganic materials 0.000 claims description 23
- 239000006185 dispersion Substances 0.000 claims description 10
- 230000004888 barrier function Effects 0.000 claims description 7
- 239000000843 powder Substances 0.000 description 16
- 239000007789 gas Substances 0.000 description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 description 6
- 239000000446 fuel Substances 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920009441 perflouroethylene propylene Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Conductive Materials (AREA)
- Non-Insulated Conductors (AREA)
- Fuel Cell (AREA)
Description
【発明の詳細な説明】
本発明は体積抵抗値が低く且つガス遮断性を有
するシートを提供するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sheet having a low volume resistivity and gas barrier properties.
燃料電池は一般に電解質マトリツクス層の片面
に陽極、他面に陰極が設けられた単電池をセパレ
ータを介して所定数直列接続せしめた構造を有し
ている。 A fuel cell generally has a structure in which a predetermined number of unit cells each having an anode on one side of an electrolyte matrix layer and a cathode on the other side are connected in series via a separator.
この燃料電池におけるセパレータとしては、従
来、金属シート或いはカーボン板が用いられてい
るが、前者は耐薬品性が充分でなく、電解液によ
る腐食の進行が避けられず、電池寿命の短命化を
招くばかりでなく、比重が大きいため電池の軽量
化を計る際に不利であり、後者はガス遮断性が劣
り、燃料ガスの漏洩のため、これまた電池寿命に
悪影響を及ぼすことがあり、いずれも満足すべき
ものでないのが実情である。 Conventionally, metal sheets or carbon plates have been used as separators in fuel cells, but the former do not have sufficient chemical resistance and are subject to corrosion due to the electrolyte, resulting in a shortened battery life. In addition, the high specific gravity is disadvantageous when trying to reduce the weight of the battery, and the latter has poor gas barrier properties and fuel gas leakage, which can also have a negative effect on battery life. The reality is that it is not something that should be done.
本発明は従来技術の有する上記問題を解決した
ガス遮断性を有する導電性シートに係り、カーボ
ンペーパーに導電性フツ素樹脂デイスパージヨン
が含浸され且つ該フツ素樹脂が焼成されたフツ素
樹脂含浸カーボンペーパーが、導電性フツ素樹脂
シート両面に積層されて成るものである。 The present invention relates to an electrically conductive sheet having gas barrier properties that solves the above-mentioned problems of the prior art. Carbon paper is laminated on both sides of a conductive fluororesin sheet.
本発明において用いるカーボンペーパーはカー
ボン繊維を紙状に抄いて得られるもので、市販品
としては例えば東レ社製商品名トレカ、ユニチカ
社製商品名CE30或いはCXO−100、日本カーボ
ン社製商品名SH35、東邦レーヨン社製商品名ベ
スフアイト等を挙げることができる。 The carbon paper used in the present invention is obtained by cutting carbon fibers into a paper form, and commercially available products include, for example, Torayca (trade name) manufactured by Toray Industries, Inc., trade name CE30 or CXO-100 (manufactured by Unitika Corporation), and SH35 (trade name manufactured by Nippon Carbon Co., Ltd.). , Besuphite (trade name) manufactured by Toho Rayon Co., Ltd., and the like.
このカーボンペーパーには導電性フツ素樹脂デ
イスパージヨンが含浸され、更に該フツ素樹脂が
焼成されてフツ素樹脂含浸カーボンペーパーとさ
れ、後述の導電性フツ素樹脂シートと積層され
る。 This carbon paper is impregnated with a conductive fluororesin dispersion, and the fluororesin is further fired to form a fluororesin-impregnated carbon paper, which is laminated with a conductive fluororesin sheet to be described later.
カーボンペーパーに含浸せしめる導電性フツ素
樹脂デイスパージヨンとしてはポリテトラフルオ
ロエチレン（以下、PTFEと称す）、テトラフル
オロエチレン−ヘキサフルオロプロピレン共重合
体（以下FEPと称す）等のフツ素樹脂粉末にカ
ーボン、グラフアイト等の導電性粉末を分散せし
めた水性デイスパージヨンが用いられる。このデ
イスパージヨンにおけるフツ素樹脂粉末と導電性
粉末の配合割合は、フツ素樹脂或いは導電性粉末
の種類や粒径等に応じて設定するが、通常はフツ
素樹脂粉末100重量部に対し、導電性粉末80〜200
重量部である。なお、デイスパージヨン中におけ
る固形分濃度は約20〜50重量％に設定するのが、
カーボンペーパーへの含浸のために好ましい。 As the conductive fluororesin dispersion impregnated into carbon paper, fluororesin powders such as polytetrafluoroethylene (hereinafter referred to as PTFE) and tetrafluoroethylene-hexafluoropropylene copolymer (hereinafter referred to as FEP) are used. An aqueous dispersion in which conductive powder such as carbon or graphite is dispersed is used. The blending ratio of the fluororesin powder and the conductive powder in this dispersion is determined depending on the type and particle size of the fluororesin or the conductive powder, but usually, for 100 parts by weight of the fluororesin powder, Conductive powder 80~200
Parts by weight. The solid content concentration in the dispersion should be set at approximately 20 to 50% by weight.
Preferred for impregnation into carbon paper.
カーボンペーパーに導電性フツ素樹脂デイスパ
ージヨンを含浸させ、更に該フツ素樹脂を焼成さ
せたフツ素樹脂含浸カーボンペーパーは気密性が
優れている。この理由は、カーボンペーパーへの
導電性フツ素樹脂デイスパージヨンの含浸によ
り、カーボンペーパーの微細空隙がフツ素樹脂粉
末および導電性粉末で充填され、更にフツ素樹脂
粉末の焼成時にフツ素樹脂粉末が溶融状態となり
粉末同志が融合すると共に前記微細空隙を閉塞す
るためと推論される。 Fluororesin-impregnated carbon paper, which is obtained by impregnating carbon paper with a conductive fluororesin dispersion and then firing the fluororesin, has excellent airtightness. The reason for this is that by impregnating the carbon paper with the conductive fluororesin dispersion, the fine voids in the carbon paper are filled with the fluororesin powder and the conductive powder, and when the fluororesin powder is fired, the fluororesin powder It is inferred that this is because the powder becomes molten, the powders fuse together, and the fine voids are closed.
本発明においては、導電性粉末とフツ素樹脂を
混合し、これをシート成形する方法等により得ら
れる導電性フツ素樹脂シートの両面に、上記フツ
素樹脂含浸カーボンペーパーが積層一体化され
る。導電性フツ素樹脂シートとしては厚さ約30〜
100μ、体積抵抗100Ω・cm以下のものが実用的で
ある。このシートを形成するためのフツ素樹脂は
特に限定されるものではなく、PTFE、、FEP、
エチレン−テトラフルオロエチレン共重合体、テ
トラフルオロエチレン−パーフルオロアルキルビ
ニルエーテル共重合体等を用いることができる。
この導電性フツ素樹脂シートは未焼成品或いは焼
成品のいずれも用いることができるが、未焼成フ
ツ素樹脂シートを用いた場合には、該シートと前
記カーボンペーパーの積層時或いは積層後に該フ
ツ素樹脂シートを焼成すると、機械的強度の特に
大きな導電性シートが得られるので好適である。 In the present invention, the fluororesin-impregnated carbon paper is laminated and integrated on both sides of a conductive fluororesin sheet obtained by mixing conductive powder and fluororesin and forming the mixture into a sheet. As a conductive fluororesin sheet, the thickness is about 30~
A material with a volume resistance of 100μ or less and a volume resistance of 100Ω・cm or less is practical. The fluororesin used to form this sheet is not particularly limited, and includes PTFE, FEP,
Ethylene-tetrafluoroethylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, etc. can be used.
This conductive fluororesin sheet can be either an unfired product or a fired product, but when an unfired fluororesin sheet is used, the conductive fluororesin sheet can be used during or after laminating the sheet and the carbon paper. Sintering the base resin sheet is preferable because it yields a conductive sheet with particularly high mechanical strength.
かような本発明のシートは燃料電池のセパレー
タの他、低抵抗性を利用する各種電極等に用いる
ことができる。 Such a sheet of the present invention can be used not only as a separator for fuel cells but also for various electrodes that utilize low resistance.
本発明のシートは上記のように構成されてお
り、下記実施例からも判るように導電性およびガ
ス遮断性を有している。また、フツ素樹脂とカー
ボンペーパーを主材料とするので、耐熱性、耐薬
品性も良好であり、更に内層としての導電性フツ
素樹脂シートが補強作用を示し、機械的強度が大
きい等の特有の効果を奏する。 The sheet of the present invention is constructed as described above, and has electrical conductivity and gas barrier properties, as can be seen from the examples below. In addition, since the main materials are fluororesin and carbon paper, it has good heat resistance and chemical resistance, and the conductive fluororesin sheet as an inner layer has a reinforcing effect and has special characteristics such as high mechanical strength. It has the effect of
以下、実施例により本発明を更に詳細に説明す
る。 Hereinafter, the present invention will be explained in more detail with reference to Examples.
実施例
未焼成のPTFE粉末100重量部に対しカーボン
粉末150重量部が配合せしめられた水性デイスパ
ージヨン（固形分濃度30重量％）中に厚さ0.3mm
のカーボンペーパー（東邦レーヨン社製商品名ベ
スフアイト）を浸漬し、カーボンペーパーにデイ
スパージヨンを含浸せしめて引き上げ、室温で５
分間風乾する。Example 100 parts by weight of unfired PTFE powder and 150 parts by weight of carbon powder were mixed into an aqueous dispersion (solid content concentration 30% by weight) with a thickness of 0.3 mm.
Carbon paper (trade name: Besuphite, manufactured by Toho Rayon Co., Ltd.) was immersed, the carbon paper was impregnated with dispersion, pulled out, and heated at room temperature for 5 minutes.
Air dry for a minute.
次に、100℃の温度で30分間加熱し水分を除去
する。 Next, heat at 100°C for 30 minutes to remove moisture.
その後、390℃の温度で５分間加熱することに
よりPTFEを焼成し、フツ素樹脂含浸カーボンペ
ーパーを得る。 Thereafter, the PTFE is fired by heating at a temperature of 390° C. for 5 minutes to obtain a fluororesin-impregnated carbon paper.
一方、これとは別に未焼成PTFE粉末100重量
部に対し、カーボン150重量部を配合して、シー
ト状に成形し、更に390℃に加熱して焼成し、厚
さ80μの導電性フツ素樹脂シートを得る。 Separately, 150 parts by weight of carbon was mixed with 100 parts by weight of unfired PTFE powder, formed into a sheet, heated to 390°C and fired, and made into a conductive fluorocarbon resin with a thickness of 80μ. Get a sheet.
次に、導電性フツ素樹脂シートの両面に上記フ
ツ素樹脂含浸カーボンペーパーを各１枚重ね合わ
せ、温度390℃、圧力20Kg／cm2の条件で30分間加
熱加圧することによりフツ素樹脂脂シートとカー
ボンペーパーを熱融着せしめ、ガス遮断性を有す
る導電性シートを得た。 Next, one sheet of the above-mentioned fluororesin-impregnated carbon paper was placed on each side of the conductive fluororesin sheet, and the fluororesin sheet was heated and pressed for 30 minutes at a temperature of 390°C and a pressure of 20 kg/ cm2. and carbon paper were heat-sealed to obtain a conductive sheet with gas barrier properties.
この導電性シートの体積抵抗は0.3Ω・cmと低
く、ガス透過は認められなかつた。 The volume resistance of this conductive sheet was as low as 0.3Ω·cm, and no gas permeation was observed.
なお、体積抵抗はASTM257により測定し、ガ
ス遮断性はガス透過試験機（理化精機工業社製、
気体透過測定装置単式Ａ型）により測定した。 The volume resistance was measured according to ASTM257, and the gas barrier property was measured using a gas permeation tester (manufactured by Rika Seiki Kogyo Co., Ltd.,
Measurement was performed using a gas permeation measuring device (single type A type).
Claims (1)
パージヨンが含浸され且つ該フツ素樹脂が焼成さ
れたフツ素樹脂含浸カーボンペーパーが、導電性
フツ素樹脂シートの両面に積層されて成るガス遮
断性を有する導電性シート。1 Carbon paper impregnated with a conductive fluororesin dispersion and fired with the fluororesin is laminated on both sides of a conductive fluororesin sheet and has gas barrier properties. conductive sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58015251A JPS59141172A (en) | 1983-01-31 | 1983-01-31 | Conductor sheet with gas interceptibility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58015251A JPS59141172A (en) | 1983-01-31 | 1983-01-31 | Conductor sheet with gas interceptibility |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59141172A JPS59141172A (en) | 1984-08-13 |
| JPH0415961B2 true JPH0415961B2 (en) | 1992-03-19 |
Family
ID=11883632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58015251A Granted JPS59141172A (en) | 1983-01-31 | 1983-01-31 | Conductor sheet with gas interceptibility |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59141172A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61103946A (en) * | 1984-10-26 | 1986-05-22 | Japan Goatetsukusu Kk | Electrically conductive composite sheet |
| US4818640A (en) * | 1985-09-25 | 1989-04-04 | Kureha Kagaku Kogyo Kabushiki Kaisha | Carbonaceous composite product produced by joining carbonaceous materials together by tetrafluoroethylene resin, and process for producing the same |
| JPS63140095A (en) * | 1986-12-03 | 1988-06-11 | Ebara Corp | Bipolar plate for electrolytic cell |
| US4913706A (en) * | 1988-09-19 | 1990-04-03 | International Fuel Cells Corporation | Method for making a seal structure for an electrochemical cell assembly |
-
1983
- 1983-01-31 JP JP58015251A patent/JPS59141172A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59141172A (en) | 1984-08-13 |
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