JPH0340450B2 - - Google Patents
Info
- Publication number
- JPH0340450B2 JPH0340450B2 JP58185661A JP18566183A JPH0340450B2 JP H0340450 B2 JPH0340450 B2 JP H0340450B2 JP 58185661 A JP58185661 A JP 58185661A JP 18566183 A JP18566183 A JP 18566183A JP H0340450 B2 JPH0340450 B2 JP H0340450B2
- Authority
- JP
- Japan
- Prior art keywords
- fluororesin
- conductive
- sheet
- carbon
- 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 27
- 229910052799 carbon Inorganic materials 0.000 claims description 27
- 230000004888 barrier function Effects 0.000 claims description 10
- 239000004744 fabric Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 description 16
- 239000007789 gas Substances 0.000 description 10
- 239000006185 dispersion Substances 0.000 description 7
- 238000010304 firing Methods 0.000 description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000011159 matrix material Substances 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
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- -1 Polytetrafluoroethylene Polymers 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000009941 weaving 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
- H01M8/0297—Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other
-
- 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
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
-
- 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)
- Non-Insulated Conductors (AREA)
- Fuel Cell (AREA)
Description
【発明の詳細な説明】
本発明はガス遮断性を有する導電性シートに関
し、例えば、燃料電池におけるガス遮断隔膜に使
用するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conductive sheet having gas barrier properties, and is used, for example, as a gas barrier membrane in a fuel cell.
燃料電池においては、電解質マトリツクス層の
片面に陽極を、他面には陰極をそれぞれ設けた単
電池を導電性を有するガス遮断隔膜を介して複数
箇積層し、隔膜によつて単電池相互を直列に電気
的に接続すると共に単電池相互間における燃料ガ
スを遮断している。 In a fuel cell, a plurality of single cells each having an anode on one side of an electrolyte matrix layer and a cathode on the other side are stacked with a conductive gas barrier membrane interposed therebetween, and the single cells are connected in series through the membrane. The fuel gas is cut off between the cells and the cells are electrically connected to each other.
従来、上記の隔膜には金属板またはカーボン板
が用いられている。しかしながら、金属板におい
ては、電解液による腐食の進行が避けられず、寿
命が短いという不利がある。また、カーボン板に
おいては、ガス遮断性並びに機械的強度上、厚さ
を相当に大きくしなければならず、電池の単位セ
ルが厚くなるという不利がある。 Conventionally, a metal plate or a carbon plate has been used for the above-mentioned diaphragm. However, metal plates have the disadvantage of being subject to corrosion due to the electrolyte and having a short lifespan. Further, in terms of gas barrier properties and mechanical strength, the thickness of the carbon plate must be considerably increased, resulting in a disadvantage that the unit cell of the battery becomes thicker.
ところで、導電性フツ素樹脂シートは耐腐食
性、気密性、機械的強度の何れにおいても秀れ、
上記した金属板またはカーボン板からなる隔膜の
不利を解消できるが、単体では上記燃料電池用隔
膜として不適当である。 By the way, conductive fluororesin sheets are excellent in corrosion resistance, airtightness, and mechanical strength.
Although the above disadvantages of the diaphragm made of a metal plate or carbon plate can be overcome, the diaphragm alone is not suitable as the diaphragm for a fuel cell.
本発明は導電性フツ素樹脂シートの秀れた上記
の諸特性を保有し、かつ導電性に秀れた燃料電池
用隔膜を提供することにある。 The object of the present invention is to provide a diaphragm for fuel cells that possesses the above-mentioned excellent properties of a conductive fluororesin sheet and has excellent conductivity.
すなわち、本発明に係るガス遮断性を有する導
電性シートは、カーボンペーパーまたはカーボン
クロスに導電性フツ素樹脂を含浸した高導電性シ
ートを導電性フツ素樹脂シートの片面または両面
に積層し、高導電性シートの周囲部にフツ素樹脂
の密封部を形成したことを特徴とするものであ
る。 That is, the conductive sheet having gas barrier properties according to the present invention is obtained by laminating a highly conductive sheet made of carbon paper or carbon cloth impregnated with a conductive fluororesin on one or both sides of the conductive fluororesin sheet. It is characterized in that a fluororesin sealing portion is formed around the conductive sheet.
以下、図面により本発明を説明する。 The present invention will be explained below with reference to the drawings.
第１図または第２図において、１は導電性フツ
素樹脂シート、２はカーボンペーパーまたはカー
ボンクロスに導電性フツ素樹脂を含浸した高導電
性シート、３は高導電性シート２の周囲部に形成
したフツ素樹脂の密封部である。 In Fig. 1 or 2, 1 is a conductive fluororesin sheet, 2 is a highly conductive sheet made of carbon paper or carbon cloth impregnated with conductive fluororesin, and 3 is a periphery of the highly conductive sheet 2. This is the sealed part of the formed fluororesin.
第３図は本発明に係るガス遮断性を有する導電
性シートの使用状態の一例を示し、A0，A1は本
発明に係る導電性シート、Ｂは単電池（B0は電
解質マトリツクス、B1，B1はガス透過性を有す
る電極である）である。 FIG. 3 shows an example of the usage state of the conductive sheet having gas barrier properties according to the present invention, where A 0 and A 1 are the conductive sheet according to the present invention, B is a cell (B 0 is an electrolyte matrix, B 1 and B 1 are gas permeable electrodes).
上記高導電性シート２におけるカーボンペーパ
ーは例えばカーボン繊維を抄紙することにより得
られ、市販品としては東レ社製商品名トレカマツ
ト、BO−030、ユニチカ社製商品名CE30、日本
カーボン社製商品SH35等がある。また、カーボ
ンクロスはカーボン繊維を布に織製することによ
り得られ、市販品としては東レ社製商品名トレカ
クロス＃6142、日本カーボン社製商品名カーボロ
ンCF20、東邦レーヨン社製商品名ベスフアイト
＃1101等がある。このカーボンペーパーまたはカ
ーボンクロスに含浸する導電性フツ素樹脂には、
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−パーフルオロア
ルキルビニルエーテル共重合体（以下、PFAと
称す）、テトラフルオロエチレン−ヘキサフルオ
ロプロピレレン共重合体（以下、FEPと称す）
等のフツ素樹脂粉末とカーボン・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
ンを使用できる。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
樹脂あるいは導電性粉末の種類や粒径等によつて
異るが、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。また、このデ
イスパージヨンにおける固型分濃度は通常約20〜
50重量％である。 The carbon paper in the highly conductive sheet 2 is obtained, for example, by paper-making carbon fibers, and commercially available products include Torayamatto and BO-030 manufactured by Toray Industries, Ltd., CE30 manufactured by Unitika, and SH35 manufactured by Nippon Carbon Co., Ltd. There is. In addition, carbon cloth is obtained by weaving carbon fibers into cloth, and commercially available products include Torayca Cloth #6142 manufactured by Toray Industries, Carbon Cross CF20 manufactured by Nippon Carbon Co., Ltd., and Beshuite #1101 manufactured by Toho Rayon Co., Ltd. etc. The conductive fluororesin impregnated into this carbon paper or carbon cloth includes:
Polytetrafluoroethylene (hereinafter referred to as PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (hereinafter referred to as PFA), tetrafluoroethylene-hexafluoropropylelene copolymer (hereinafter referred to as FEP)
An aqueous dispersion prepared by dispersing a fluororesin powder such as fluorine resin powder and a conductive powder such as carbon graphite can be used. The blending ratio of fluororesin powder and conductive powder in this dispersion varies depending on the type and particle size of the fluororesin or conductive powder, but usually the proportion of conductive powder per 100 parts by weight of fluororesin powder is The powder is 80-200 parts by weight. In addition, the solid content concentration in this dispersion is usually about 20~
50% by weight.
高導電性シートは例えばカーボンペーパーまた
はカーボンクロスを上記水性デイスパージヨン中
に浸漬し、その後これをフツ素樹脂の融点以上の
温度に加熱し、フツ素樹脂を焼成或いは焼付けす
る方法等により得ることができる。 The highly conductive sheet can be obtained by, for example, immersing carbon paper or carbon cloth in the above aqueous dispersion, then heating it to a temperature higher than the melting point of the fluororesin, and firing or baking the fluororesin. I can do it.
上記導電性フツ素樹脂シート１には、カーボ
ン、グラフアイト等の導電性粉末を配合した
PTFE、PFE、FEP等のフツ素樹脂のシートを用
いることができ、その体積抵抗率は通常100Ω−
cm以下である。 The conductive fluororesin sheet 1 contains conductive powder such as carbon or graphite.
Fluororesin sheets such as PTFE, PFE, and FEP can be used, and their volume resistivity is usually 100Ω-
cm or less.
上記導電性フツ素樹脂シート１および高導電性
シート２の厚みはいずれも通常100〜500μであ
る。 The thickness of the conductive fluororesin sheet 1 and the highly conductive sheet 2 is usually 100 to 500 μm.
高導電性シート周囲部の密封部３は非透過性並
びに熱融着性を高めるためフツ素樹脂のみで形成
するのが好適であり、導電性粉末等を混入する場
合には該粉末等の混入を可及的に少なくする必要
がある。而して、この密封部は例えば上記カーボ
ンペーパー等の周縁部にフツ素樹脂を含浸し、こ
れを焼成或いは焼付し、次いで周縁部以外の個所
に前記導電性粉末を含むフツ素樹脂の水性デイス
パージヨンを含浸し、焼成或いは焼付けする方
法、或いはカーボンペーパー等の全体に導電性粉
末を含むフツ素樹脂の水性デイスパージヨンを含
浸し、焼成したのち、その周縁部にフツ素樹脂を
含浸させこれを焼成する方法等によつて形成でき
る。 The sealing part 3 around the highly conductive sheet is preferably formed of only fluororesin to improve impermeability and thermal adhesion, and if conductive powder or the like is mixed, the powder, etc. is mixed in. need to be reduced as much as possible. This sealing part is made by, for example, impregnating the periphery of the above-mentioned carbon paper with a fluororesin, firing or baking it, and then applying an aqueous solution of the fluororesin containing the conductive powder to areas other than the periphery. A method of impregnating a spargeon and firing or baking it, or a method of impregnating the whole of carbon paper, etc. with an aqueous dispersion of a fluororesin containing conductive powder, firing it, and then impregnating the periphery with a fluororesin. It can be formed by a method such as firing this.
また、この密封部は、第４図に示すように高導
電性シート２の周囲寸法を導電性フツ素樹脂シー
ト１の周囲寸法よりも小さくし、高導電性シート
２，２の周囲にフツ素樹脂（PTFE，PFA，
FEP等）のシート状枠体３，３を加熱融着する
ことにより形成してもよい。 In addition, in this sealed part, as shown in FIG. Resin (PTFE, PFA,
It may also be formed by heat-sealing sheet-like frames 3, 3 made of FEP, etc.).
本発明に係るガス遮断性を有する導電性シート
は、上述した通りの構成であり、密封部がフツ素
樹脂のみ或いはフツ素樹脂分を多量に含有する非
導電性であつても、この密封部に対して電気的に
並列に存在する導電性フツ素樹脂含浸カーボンペ
ーパーまたはクロスの高高導電性のために単電池
間を良好に電気的に直列接続できる。而して、密
封部をフツ素樹脂のみ或いはフツ素樹脂分を多量
にし、その融着性を高め、また、この密封部の秀
れた非透過性とカーボンペーパーまたはクロス内
含浸フツ素樹脂の焼成による非透過性の増大とに
より、ガス遮断性を著しく向上できる。 The conductive sheet having gas barrier properties according to the present invention has the above-described structure, and even if the sealed portion is a non-conductive sheet containing only fluororesin or a large amount of fluororesin, this sealed portion Due to the high conductivity of the conductive fluororesin-impregnated carbon paper or cloth that exists electrically in parallel with the cell, it is possible to electrically connect the cells in series in a good manner. Therefore, the sealing part is made only of fluororesin or contains a large amount of fluororesin to improve its fusion properties, and the excellent impermeability of this sealing part and the fluororesin impregnated in carbon paper or cloth are combined. Due to the increase in impermeability due to firing, gas barrier properties can be significantly improved.
また、高導電性シート、導電性フツ素樹脂シー
ト、密封部の全てが耐食性に秀れているから、電
解液による腐食の問題もない。 Furthermore, since the highly conductive sheet, the conductive fluororesin sheet, and the sealing part all have excellent corrosion resistance, there is no problem of corrosion caused by the electrolyte.
実施例
未焼成のPTFE粉末100重量部に対しカーボン
粉末60重量部を配分した固形分濃度30重量％の水
性デイスパージヨン中に厚さ0.3mmのカーボンペ
ーパー（東邦レーヨン社製商品名ベフフアイト）
を浸漬し、カーボンペーパーにデイスパージヨン
を含浸し、５分間風乾し、次いで、100℃で30分
間加熱して水分を除去し、而るのち、390℃で５
分間加熱してPTFEを焼成し、高導電性シートを
得た。Example: 0.3 mm thick carbon paper (trade name: Befufaite, manufactured by Toho Rayon Co., Ltd.) in an aqueous dispersion with a solid content concentration of 30% by weight, in which 60 parts by weight of carbon powder was distributed to 100 parts by weight of unfired PTFE powder.
Carbon paper is impregnated with the dispersion, air-dried for 5 minutes, heated at 100℃ for 30 minutes to remove moisture, and then heated at 390℃ for 5 minutes.
The PTFE was fired by heating for a minute to obtain a highly conductive sheet.
一方、未焼成PTFE粉末100重量部に対しカー
ボン25重量部を配合してシート状に成形し、更に
390℃で焼成して厚さ200μの導電性フツ素樹脂シ
ートを得た。 On the other hand, 25 parts by weight of carbon was mixed with 100 parts by weight of unfired PTFE powder, formed into a sheet shape, and
A conductive fluororesin sheet with a thickness of 200 μm was obtained by firing at 390°C.
次に導電性フツ素樹脂シートの両面に上記の高
導電性シートを各一枚あて重ね、これら各高導電
性シートの周縁上に厚み100μのPFA枠状フイル
ムを重ね、温度390℃、圧力20Kg／cm2の条件下で、
30分間加熱加圧して高導電性シートと導電性フツ
素樹脂シートを熱融着すると共に高導電性シート
の周囲部にPFAから成る密封部を形成させた。 Next, one of the above highly conductive sheets was placed on both sides of the conductive fluororesin sheet, and a 100μ thick PFA frame film was placed on the periphery of each highly conductive sheet at a temperature of 390℃ and a pressure of 20Kg. / cm2 ,
The highly conductive sheet and the conductive fluororesin sheet were thermally fused together by heating and pressurizing for 30 minutes, and a seal made of PFA was formed around the highly conductive sheet.
このようにして得た第４図に示すのと同構造の
導電性シートの体積抵抗率は0.8Ω−cmであり、
充分に低抵抗であつた。 The volume resistivity of the conductive sheet obtained in this way and having the same structure as shown in FIG. 4 is 0.8Ω-cm.
The resistance was sufficiently low.
第１図並びに第２図はそれぞれ本発明に係るガ
ス遮断性を有する導電シートの実施例を示す説明
図、第３図は本発明シートの使用状態の一例を示
す説明図、第４図は本発明の別実施例を示す説明
図である。
図において、１は導電性フツ素樹脂シート、
２，２は高導電性シート、３，３は密封部であ
る。
FIGS. 1 and 2 are explanatory diagrams showing examples of the conductive sheet having gas barrier properties according to the present invention, FIG. 3 is an explanatory diagram showing an example of the usage state of the sheet of the present invention, and FIG. It is an explanatory view showing another example of the invention. In the figure, 1 is a conductive fluororesin sheet;
2 and 2 are highly conductive sheets, and 3 and 3 are sealing parts.
Claims (1)
電性フツ素樹脂を含浸した高導電性シートを導電
性フツ素樹脂シートの片面または両面に積層し、
高導電性シートの周囲部にフツ素樹脂の密封部を
形成したことを特徴とするガス遮断性を有する導
電性シート。1. A highly conductive sheet made of carbon paper or carbon cloth impregnated with conductive fluororesin is laminated on one or both sides of the conductive fluororesin sheet,
A conductive sheet having gas barrier properties, characterized in that a sealing portion of fluororesin is formed around the periphery of the highly conductive sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58185661A JPS6077364A (en) | 1983-10-03 | 1983-10-03 | Electroconductive sheet having gas isolating ability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58185661A JPS6077364A (en) | 1983-10-03 | 1983-10-03 | Electroconductive sheet having gas isolating ability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6077364A JPS6077364A (en) | 1985-05-01 |
| JPH0340450B2 true JPH0340450B2 (en) | 1991-06-19 |
Family
ID=16174654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58185661A Granted JPS6077364A (en) | 1983-10-03 | 1983-10-03 | Electroconductive sheet having gas isolating ability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6077364A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
1983
- 1983-10-03 JP JP58185661A patent/JPS6077364A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6077364A (en) | 1985-05-01 |
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