JPH11354136A - Fuel cell, separator for fuel cell, and manufacture therefor - Google Patents
Fuel cell, separator for fuel cell, and manufacture thereforInfo
- Publication number
- JPH11354136A JPH11354136A JP11071779A JP7177999A JPH11354136A JP H11354136 A JPH11354136 A JP H11354136A JP 11071779 A JP11071779 A JP 11071779A JP 7177999 A JP7177999 A JP 7177999A JP H11354136 A JPH11354136 A JP H11354136A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- fuel cell
- separator
- expanded graphite
- graphite 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.)
- Granted
Links
Classifications
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、燃料電池、燃料電
池用セパレータ及びその製造方法に関する。The present invention relates to a fuel cell, a fuel cell separator, and a method of manufacturing the same.
【０００２】[0002]
【従来の技術】従来、燃料電池用セパレータは、黒鉛ブ
ロックから削り出す方法、天然りん片状黒鉛を強酸及び
酸化剤で処理後、熱処理して得られる膨張黒鉛、膨張黒
鉛シート等を高圧力下で成形する方法、前記成形体に液
状熱硬化性樹脂を含浸、硬化する方法などで製造されて
いた。2. Description of the Related Art Conventionally, a fuel cell separator is produced by shaving a graphite block, treating natural flaky graphite with a strong acid and an oxidizing agent, and then subjecting the expanded graphite and expanded graphite sheet obtained by heat treatment to high pressure. And a method of impregnating and curing the molded article with a liquid thermosetting resin.
【０００３】しかし前記の各製造法では、何れも充分な
性能のセパレータが得られなかったり、製造工程が多く
コスト高となったり、重量の大きいものとなるという欠
点があった。これらを解決するものとして、国際公開番
号ＷＯ９７／０２６１２明細書では、平均粒子径が５〜
１２μｍという特定の粒子径の膨張黒鉛粉末を熱可塑性
樹脂又は熱硬化性樹脂に分散させた燃料電池用セパレー
タが記載されている。しかしながら、前記のような微粒
子径の膨張黒鉛粉を用いた場合、電気比抵抗や機械特性
に劣り、要求特性を満足する燃料電池用セパレータを供
給できないという欠点が依然としてあった。However, each of the above-mentioned manufacturing methods has a drawback that a separator having sufficient performance cannot be obtained, the number of manufacturing steps increases, the cost increases, and the weight increases. As a solution to these problems, International Publication No. WO97 / 02612 describes that the average particle size is 5 to 5.
A fuel cell separator in which expanded graphite powder having a specific particle size of 12 μm is dispersed in a thermoplastic resin or a thermosetting resin is described. However, when the expanded graphite powder having the fine particle diameter as described above is used, there is still a defect that the electrical resistivity and the mechanical characteristics are inferior, and a fuel cell separator satisfying the required characteristics cannot be supplied.
【０００４】[0004]
【発明が解決しようとする課題】請求項１及び２記載の
発明は、上記問題に鑑み、電気抵抗、ガス透過性、液膨
潤性、機械的強度等のセパレータ特性において優れ、経
済性にも優れる燃料電池用セパレータを提供するもので
ある。また、請求項３及び４記載の発明は、電気抵抗、
ガス透過性、液膨潤性、機械的強度等のセパレータ特性
において優れ、成形性の良好な燃料電池用セパレータを
簡易な工程で安価に、かつ安定に生産できる燃料電池用
セパレータの製造方法を提供するものである。さらに、
請求項５及び６記載の発明は、セパレータの電気抵抗、
ガス透過性、液膨潤性、機械的強度等の特性が優れ、高
性能な燃料電池を提供するものである。In view of the above problems, the inventions according to claims 1 and 2 are excellent in separator characteristics such as electric resistance, gas permeability, liquid swelling property and mechanical strength, and are also excellent in economic efficiency. An object of the present invention is to provide a fuel cell separator. Further, the invention according to claims 3 and 4 provides an electric resistance,
Provided is a method for producing a fuel cell separator which is excellent in separator properties such as gas permeability, liquid swelling property and mechanical strength, and which can produce a fuel cell separator having good moldability in a simple process at low cost and stably. Things. further,
The invention according to claims 5 and 6 provides an electric resistance of the separator,
An object of the present invention is to provide a high-performance fuel cell having excellent properties such as gas permeability, liquid swelling property and mechanical strength.
【０００５】[0005]
【発明が解決するための手段】本発明は、平均粒径が５
０μｍ以上μｍの膨張黒鉛粉が樹脂中に分散されてなる
燃料電池用セパレータに関する。また、本発明は、燃料
電池が、固体高分子型である前記の燃料電池用セパレー
タに関する。According to the present invention, the average particle size is 5%.
The present invention relates to a fuel cell separator in which expanded graphite powder of 0 μm or more and μm is dispersed in a resin. Further, the present invention relates to the above fuel cell separator, wherein the fuel cell is a solid polymer type.
【０００６】また、本発明は、平均粒径が５０μｍ以上
の膨張黒鉛粉と熱硬化性樹脂又は熱可塑性樹脂を含む混
合物を成形することを特徴とする燃料電池用セパレータ
の製造方法に関する。また、本発明は、使用する樹脂が
フェノール樹脂である前記の燃料電池用セパレータの製
造方法に関する。また、本発明は、前記セパレータを有
してなる燃料電池に関する。さらに、本発明は、固体高
分子型である前記燃料電池に関する。The present invention also relates to a method for producing a separator for a fuel cell, comprising molding a mixture containing expanded graphite powder having an average particle size of 50 μm or more and a thermosetting resin or a thermoplastic resin. The present invention also relates to the above-described method for producing a fuel cell separator, wherein the resin used is a phenolic resin. The present invention also relates to a fuel cell having the separator. Furthermore, the present invention relates to the fuel cell, which is a solid polymer type.
【０００７】[0007]
【発明の実施の形態】本発明においては、平均粒径が５
０μｍ以上の膨張黒鉛粉を予め製造し、これを樹脂と混
合して成形することにより、平均粒径が５０μｍ以上の
膨張黒鉛粉が樹脂中に分散された燃料電池用セパレータ
を製造することができる。なお、平均粒径は、数平均粒
径であり、例えば、(株)島津製作所製、ＳＡＬＤ−３０
００Ｊ等の各種粒度分布測定装置により測定することが
できる。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the average particle size is 5
By preparing an expanded graphite powder of 0 μm or more in advance, mixing this with a resin, and molding, it is possible to manufacture a fuel cell separator in which an expanded graphite powder having an average particle size of 50 μm or more is dispersed in a resin. . The average particle size is a number average particle size, for example, SALD-30 manufactured by Shimadzu Corporation.
It can be measured by various particle size distribution measuring devices such as 00J.
【０００８】ここで、膨張黒鉛粉の平均粒径が５０μｍ
未満では、セパレータの電気比抵抗が大きく、また機械
特性にも劣る。本発明で用いられる膨張黒鉛粉の平均粒
径は、８０μｍ〜５００μｍとすることが好ましく、１
００μｍ〜３００μｍとすることがより好ましく、１２
０μｍ〜２８０μｍとすることがさらに好ましく、１５
０μｍ〜２５０μｍとすることが最も好ましい。The expanded graphite powder has an average particle size of 50 μm.
If it is less than 1, the electrical resistivity of the separator is large and the mechanical properties are inferior. The average particle size of the expanded graphite powder used in the present invention is preferably from 80 μm to 500 μm,
More preferably, the thickness is from 00 μm to 300 μm,
0 μm to 280 μm, more preferably 15 μm to 280 μm.
Most preferably, it is 0 μm to 250 μm.
【０００９】このような膨張黒鉛粉は、例えば、次のよ
うにして製造される。膨張黒鉛粉の原料となる黒鉛とし
ては、天然黒鉛、キツシユ黒鉛、熱分解黒鉛等の高度に
結晶が発達した黒鉛が好ましいものとして挙げられる。
得られる特性と経済性のバランスからは天然黒鉛が好ま
しい。用いる天然黒鉛としては、特に制限はなく、Ｆ４
８Ｃ（日本黒鉛(株)製、商品名）、Ｈ−５０（中越黒鉛
(株)製、商品名）等の市販品を用いることができる。Such expanded graphite powder is manufactured, for example, as follows. Preferred examples of graphite used as a raw material of the expanded graphite powder include graphite in which crystals are highly developed, such as natural graphite, cachet graphite, and pyrolytic graphite.
Natural graphite is preferred from the viewpoint of the balance between the obtained properties and economy. The natural graphite to be used is not particularly limited.
8C (trade name, manufactured by Nippon Graphite Co., Ltd.), H-50 (Chuetsu Graphite)
Commercial products such as (trade name, manufactured by Co., Ltd.) can be used.
【００１０】黒鉛の処理に用いられる、酸成分として
は、硫酸、硝酸、硫酸と硝酸との混液などが挙げられ、
これらに過酸化水素を添加して処理することができる。
膨張黒鉛とするための処理法としては、例えば、前記黒
鉛を前記酸成分の溶液に浸漬処理して、黒鉛層間化合物
を生成させ、ついで、水洗してから急速加熱して、黒鉛
結晶のＣ軸方向を膨張処理する方法が挙げられる。これ
により、虫状形で圧縮特性を有する膨張黒鉛を得ること
ができる。The acid component used for the treatment of graphite includes sulfuric acid, nitric acid, a mixed solution of sulfuric acid and nitric acid, and the like.
These can be treated by adding hydrogen peroxide.
As a treatment method for forming expanded graphite, for example, the graphite is immersed in a solution of the acid component to generate a graphite intercalation compound, and then washed with water and then rapidly heated to obtain a C-axis of graphite crystal. There is a method of expanding the direction. This makes it possible to obtain an insect-like expanded graphite having compressive properties.
【００１１】上記工程で得られた膨張黒鉛を、圧縮成
形、ロール等でシート状に加工し、最適密度に調整した
後、粉砕して膨張黒鉛粉を得ることができる。必要に応
じて得られた膨張黒鉛粉を分級して用いることもでき
る。The expanded graphite obtained in the above process can be processed into a sheet by compression molding, rolls or the like, adjusted to an optimum density, and then pulverized to obtain expanded graphite powder. If necessary, the obtained expanded graphite powder can be classified and used.
【００１２】本発明において、前記膨張黒鉛粉と共に用
いられる熱硬化性樹脂又は熱可塑性樹脂としては、その
性状（液体、粉状）及び構造に特に制限はなく、例え
ば、無溶剤液状エポキシ樹脂、固形エポキシ樹脂、メラ
ミン樹脂、アクリル樹脂、レゾールタイプ、ノボラック
タイプ等の各種フェノール樹脂、ポリアミド樹脂、粉状
ポリアミドイミド樹脂、フェノキシ樹脂等が使用され
る。これらの樹脂は必要に応じて、硬化剤、硬化促進
剤、硬化触媒等を併用することができる。たとえば、エ
ポキシ樹脂は、硬化剤と硬化促進剤が併用して使用され
る。これらの樹脂の中で、優れた特性バランスを示し、
経済性、作業性等にも優れることから、フェノール樹脂
が好ましい。In the present invention, the properties (liquid or powdery) and structure of the thermosetting resin or thermoplastic resin used together with the expanded graphite powder are not particularly limited. Various phenol resins such as an epoxy resin, a melamine resin, an acrylic resin, a resol type and a novolak type, a polyamide resin, a powdery polyamideimide resin, and a phenoxy resin are used. These resins may be used in combination with a curing agent, a curing accelerator, a curing catalyst, and the like, if necessary. For example, an epoxy resin is used in combination with a curing agent and a curing accelerator. Among these resins, it shows an excellent balance of properties,
Phenolic resins are preferred because they are also economical and workable.
【００１３】平均粒径が５０μｍ以上の膨張黒鉛粉と熱
硬化性樹脂又は熱可塑性樹脂との混合比率に特に制限は
ないが、成形性及び特性を考慮すると膨張黒鉛粉／樹脂
＝９５／５〜２０／８０（重量比）の範囲が好ましく、
特に１０／９０〜３０／７０の範囲が好ましい。ここ
で、混合する膨張黒鉛粉の量が、９５／５を超えると成
形性が低下する傾向にあり、マトリックス不足により機
械的強度が急激に低下する傾向にある。一方、２０／８
０未満では、導電性が低下する傾向にある。The mixing ratio of the expanded graphite powder having an average particle diameter of 50 μm or more to the thermosetting resin or the thermoplastic resin is not particularly limited. However, considering the moldability and characteristics, the expanded graphite powder / resin = 95/5 to 5/5. A range of 20/80 (weight ratio) is preferable,
Particularly, the range of 10/90 to 30/70 is preferable. Here, when the amount of the expanded graphite powder to be mixed exceeds 95/5, the moldability tends to decrease, and the mechanical strength tends to sharply decrease due to insufficient matrix. On the other hand, 20/8
If it is less than 0, the conductivity tends to decrease.
【００１４】平均粒径が５０μｍ以上の膨張黒鉛粉と熱
硬化性樹脂又は熱可塑性樹脂との混合方法に制限はな
い。液状樹脂及び固形樹脂を溶剤に溶解したものを使用
する場合、容器に所定量の平均粒径が５０μｍ以上の膨
張黒鉛粉と樹脂溶液を配合し、撹拌機を用い均一に撹拌
することで得ることができる。ここで、溶剤を含んだ樹
脂を使用して製造した混合は、通常、減圧乾燥器等で脱
溶剤し粉砕して使用される。また、膨張黒鉛粉と粉末状
の樹脂をドライブレンドする方法（シエイカー、ミキサ
ー等で溶媒無しで混合する方法）を用いることもでき
る。コスト、作業性を考慮するとドライブレンドする方
法が好ましく、特に粉末フェノール樹脂のドライブレン
ド（乾式混合）法が成形性及び成形体の特性に優れるの
で好ましい。The method of mixing the expanded graphite powder having an average particle size of 50 μm or more with a thermosetting resin or a thermoplastic resin is not limited. When using a solution in which a liquid resin and a solid resin are dissolved in a solvent, a predetermined amount of the expanded graphite powder having an average particle size of 50 μm or more and a resin solution are blended and uniformly stirred using a stirrer. Can be. Here, the mixture produced using a resin containing a solvent is usually used after removing the solvent with a reduced-pressure drier or the like and pulverizing. Further, a method of dry-blending the expanded graphite powder and the powdery resin (a method of mixing without using a solvent with a shaker or a mixer) can also be used. In consideration of cost and workability, a dry blending method is preferable, and a dry blending (dry mixing) method of a powdered phenol resin is particularly preferred because of excellent moldability and characteristics of a molded article.
【００１５】燃料電池用セパレータを成形する方法に特
に制限はなく、圧縮成形法、押し出し成形法、移送成形
法などが使用できる。成形条件は、樹脂の種類に応じて
選択することができ、通常、常温〜４００℃の温度を用
いることができる。また樹脂の種類に応じて、硬化の際
に発生する、縮合水等の不要物のガスを抜く工程をもう
けることもできる。更に、得られる成型物の硬化を更に
進めるために、成形後に熱処理を行ってもよい。The method of forming the fuel cell separator is not particularly limited, and a compression molding method, an extrusion molding method, a transfer molding method and the like can be used. The molding conditions can be selected according to the type of the resin, and a temperature of normal temperature to 400 ° C. can be usually used. In addition, a step of degassing unnecessary substances such as condensation water generated at the time of curing can be provided according to the type of the resin. Further, a heat treatment may be performed after molding in order to further advance the curing of the obtained molded article.
【００１６】成形方法としては、所望のセパレータの形
状の金型等を使用する方法が直接にセパレータを成形で
きるので好ましいが、予め大きめの成形体を作成し、こ
れを切削して所望の形状と大きさのセパレータにするこ
ともできる。As a molding method, a method using a mold or the like having a desired separator shape is preferable since the separator can be directly molded. However, a large molded body is prepared in advance, and this is cut to obtain a desired shape. It can also be a separator of a size.
【００１７】本発明における燃料電池用セパレータの大
きさ、厚さ、形状等に特に制限はない。図１に、本発明
の燃料電池用セパレータの一例の斜視図を示す。一般
に、燃料電池用セパレータ１には、反応ガスの流路を確
保するため、図１に示されるようなリブが設けられてい
る。２はリブ部、３は溝部である。図１の（ａ）は両面
にリブが設けられているものであり、（ｂ）は片面にリ
ブが設けられているものである。The size, thickness, shape, and the like of the fuel cell separator of the present invention are not particularly limited. FIG. 1 shows a perspective view of an example of the fuel cell separator of the present invention. In general, the fuel cell separator 1 is provided with ribs as shown in FIG. 1 in order to secure a flow path of a reaction gas. 2 is a rib, and 3 is a groove. FIG. 1A shows a configuration in which ribs are provided on both surfaces, and FIG. 1B shows a configuration in which ribs are provided on one surface.
【００１８】本発明における燃料電池用セパレータは、
固体高分子型、固体酸化物型、溶融炭酸塩型、アルカリ
水溶液型、酸水溶液型等種々の型式の燃料電池用セパレ
ータとして使用可能である。燃料電池は、一般に、電解
質層をはさんで燃料極及び空気極の各電極層が存在し、
その両側から挟むセパレータを単位とするセルを含む。
電解質としては、アルカリ水溶液型の場合は水酸化カリ
ウム等が用いられ、酸水溶液型の場合はリン酸等が用い
られ、固体高分子型の場合はイオン交換膜等が用いら
れ、溶融炭酸塩型の場合は炭酸リチウム等が用いられ、
固体酸化物型の場合は安定化ジルコニア等が用いられ
る。電極の基材としては、カーボン繊維等のカーボン材
などが挙げられ、必要に応じて、白金、パラジウム、
銀、ニッケル等の触媒層を表面に設けたものが用いられ
る。燃料ガスである水素は、水の分解物や天然ガス、石
油、石炭、メタノールなどの原料を必要に応じて水等と
反応させて水素リッチな改質ガスを取り出し、これを用
いることにより供給される。本発明のセパレータは中で
も、固体高分子型燃料電池用として、特に好適である。The fuel cell separator according to the present invention comprises:
It can be used as a fuel cell separator of various types such as a solid polymer type, a solid oxide type, a molten carbonate type, an alkaline aqueous solution type and an acid aqueous solution type. In general, a fuel cell has a fuel electrode and an air electrode sandwiching an electrolyte layer,
Includes cells in units of separators sandwiched from both sides.
As the electrolyte, potassium hydroxide or the like is used for an alkaline aqueous solution type, phosphoric acid or the like is used for an acid aqueous solution type, and an ion exchange membrane or the like is used for a solid polymer type, and a molten carbonate type is used. In the case of, lithium carbonate or the like is used,
In the case of a solid oxide type, stabilized zirconia or the like is used. Examples of the base material of the electrode include a carbon material such as carbon fiber, and, if necessary, platinum, palladium,
What provided the catalyst layer of silver, nickel, etc. on the surface is used. Hydrogen, which is a fuel gas, is supplied by reacting raw materials such as decomposition products of water, natural gas, petroleum, coal, and methanol with water, etc., as necessary, to extract hydrogen-rich reformed gas, and using it. You. Among others, the separator of the present invention is particularly suitable for a polymer electrolyte fuel cell.
【００１９】図２に固体高分子型燃料電池の一例のセル
の構造を表す斜視図を示す。電池の反応を起こす最小単
位のセル４は、固体高分子電解質膜５、燃料極６、空気
極７の各層から構成される３層膜８と、それを両側から
挟むセパレータ９ａ、９ｂにより構成されている。この
ように構成されたセル３が図１に示すように数段積み重
ねられ、集合体としてのセルスタック１０が得られる。FIG. 2 is a perspective view showing a cell structure of an example of the polymer electrolyte fuel cell. The minimum unit cell 4 that causes a battery reaction is composed of a three-layer membrane 8 composed of a solid polymer electrolyte membrane 5, a fuel electrode 6, and an air electrode 7, and separators 9a and 9b sandwiching the membrane 8 from both sides. ing. The cells 3 configured as described above are stacked in several stages as shown in FIG. 1, and a cell stack 10 as an aggregate is obtained.
【００２０】[0020]
【実施例】次に本発明の実施例を説明する。以下、％は
重量％を意味する。 実施例１ （１）膨張黒鉛粉の製造 硫酸（濃度９９％）６００ｇと硝酸（濃度９９％）２０
０ｇを３リットルのガラスビーカに入れた。このものに
黒鉛Ｆ４８Ｃ（固定炭素数９９％以上、日本黒鉛(株)
製、商品名）４００ｇを配合し、ガラス羽ねを取り付け
た撹拌モータ（６０rpm）で５分撹拌し、その後過酸化
水素（濃度３５％）３２ｇを添加し１５分間撹拌した。
撹拌終了後、減圧濾過で酸化黒鉛と酸成分を分離し、得
られた酸化黒鉛を別容器に移し５リットルの水を加え１
０分間撹拌し、減圧濾過で洗浄した酸化黒鉛と洗浄水を
分離した。Next, embodiments of the present invention will be described. Hereinafter,% means% by weight. Example 1 (1) Production of expanded graphite powder 600 g of sulfuric acid (concentration 99%) and nitric acid (concentration 99%) 20
0 g was placed in a 3 liter glass beaker. The graphite F48C (fixed carbon number 99% or more, Nippon Graphite Co., Ltd.)
(Trade name), 400 g was mixed, and the mixture was stirred for 5 minutes with a stirring motor (60 rpm) equipped with a glass blade, and then 32 g of hydrogen peroxide (concentration: 35%) was added and stirred for 15 minutes.
After the stirring, the graphite oxide and the acid component were separated by filtration under reduced pressure, the obtained graphite oxide was transferred to another container, and 5 liters of water was added thereto.
The mixture was stirred for 0 minute, and the graphite oxide washed by filtration under reduced pressure and washing water were separated.
【００２１】得られた洗浄酸化黒鉛をホーロー製のバッ
トに移し平らに均し、１１０℃に昇温した乾燥器に１時
間放置し水分を除去した。このものを更に８００℃に昇
温した加熱炉で５分間熱処理して、膨張黒鉛を得た。前
記膨張黒鉛をロールで圧延して密度が１．０g/cm3のシ
ートに加工し、得られたシートを粗粉砕機（ホソカワミ
クロン(株)製、ロートプレックス（商品名））で粉砕
後、微粉砕機（奈良機械製作所(株)製、自由粉砕機Ｍ−
３（商品名））で粉砕し、平均粒径１５０μｍの膨張黒
鉛粉末９０ｇを得た。The obtained washed graphite oxide was transferred to an enamel vat, leveled, and left in a dryer heated to 110 ° C. for 1 hour to remove water. This was further heat-treated in a heating furnace heated to 800 ° C. for 5 minutes to obtain expanded graphite. The expanded graphite is rolled with a roll and processed into a sheet having a density of 1.0 g / cm 3 , and the obtained sheet is pulverized with a coarse pulverizer (Rosoplex (trade name) manufactured by Hosokawa Micron Corporation). Crusher (Nara Machinery Co., Ltd., free crusher M-
3 (trade name)) to obtain 90 g of expanded graphite powder having an average particle size of 150 μm.
【００２２】（２）燃料電池用セパレータの製造 実施例１（１）で製造した膨張黒鉛粉末５６ｇとレゾー
ル型フエノール樹脂粉末（ＴＤ２０４０Ｃ、大日本イン
キ(株)製、商品名）２４ｇ（比率７０／３０）を、ビニ
ール袋に計り取り空気を入れて袋を膨らませた状態で３
０秒間ドライブレンドを行った。(2) Production of fuel cell separator 56 g of expanded graphite powder produced in Example 1 (1) and resol type phenol resin powder (TD2040C, trade name of Dainippon Ink KK, trade name) 24 g (ratio 70 / 30) is measured in a plastic bag and air is injected into the bag to inflate the bag.
Dry blending was performed for 0 seconds.
【００２３】前記ブレンド粉を、１８０℃に昇温した燃
料電池用セパレータ成形用金型に均一に充填し、前記温
度に昇温した圧縮成型機で、圧力５０kgf/cm2（ゲージ
圧力）、成形時間１０分（ガス抜き３回）の条件成形
し、図１の（ｂ）に示す形状の、外観良好の片面に２mm
（高さ）のリブ状突起物を形成した縦１４０mm、横１８
０mmの、燃料電池用セパレータを製造した。このものを
厚さ３mmの鉄板２枚で挟み、２００℃に昇温した乾燥機
に入れ３０分間熱処理した。The above blended powder is uniformly filled in a separator molding die for a fuel cell heated to 180 ° C., and molded by a compression molding machine heated to the above temperature at a pressure of 50 kgf / cm 2 (gauge pressure). Molding was performed for 10 minutes (three times of degassing), and 2 mm was applied to one side of the shape shown in FIG.
(Height) 140 mm long and 18 wide with rib-shaped protrusions formed
A 0 mm fuel cell separator was produced. This was sandwiched between two 3 mm-thick iron plates, placed in a dryer heated to 200 ° C., and heat-treated for 30 minutes.
【００２４】実施例２ （１）膨張黒鉛粉の製造 実施例１（１）で得た膨張黒鉛シートの一部を、平均粒
径が２５０μｍになるよう同粉砕機で粉砕し、９０ｇの
膨張黒鉛粉末を製造した。 （２）燃料電池用セパレータの製造 実施例２（１）で得た膨張黒鉛粉末を５６ｇ使用した以
外は、実施例１と同様の配合、方法で成形し外観良好の
リブ状突起物を形成した燃料電池用セパレータを製造し
た。Example 2 (1) Production of Expanded Graphite Powder A part of the expanded graphite sheet obtained in Example 1 (1) was pulverized by the same pulverizer so as to have an average particle size of 250 μm, and 90 g of expanded graphite was obtained. A powder was produced. (2) Production of Fuel Cell Separator Except that 56 g of the expanded graphite powder obtained in Example 2 (1) was used, molding was performed by the same composition and method as in Example 1 to form rib-like projections having good appearance. A separator for a fuel cell was manufactured.
【００２５】実施例３ （１）膨張黒鉛粉の製造 実施例１（１）で得た膨張黒鉛シートの一部を、平均粒
径が４００μｍになるよう同粉砕機で粉砕し、９０ｇの
膨張黒鉛粉末を製造した。 （２）燃料電池用セパレータの製造 実施例３（１）で得た膨張黒鉛粉を５６ｇ使用した以外
は、実施例１と同様の配合、方法で成形し外観良好のリ
ブ状突起物を形成した燃料電池用セパレータを製造し
た。Example 3 (1) Production of Expanded Graphite Powder A part of the expanded graphite sheet obtained in Example 1 (1) was pulverized by the same pulverizer so as to have an average particle size of 400 μm, and 90 g of expanded graphite was obtained. A powder was produced. (2) Production of Fuel Cell Separator Except that 56 g of the expanded graphite powder obtained in Example 3 (1) was used, the same composition and method as in Example 1 were used to form a rib-like projection having a good appearance. A separator for a fuel cell was manufactured.
【００２６】比較例１ （１）膨張黒鉛粉の製造 実施例１（１）で得た膨張黒鉛シートの一部を、平均粒
径が２０μｍになるよう同粉砕機で粉砕し、９０ｇの膨
張黒鉛粉末を製造した。 （２）燃料電池用セパレータの製造 比較例１（１）で得た膨張黒鉛粉末を５６ｇ使用した以
外は、実施例１と同様の配合、方法で成形し外観良好の
リブ状突起物を形成した燃料電池用セパレータを製造し
た。Comparative Example 1 (1) Production of Expanded Graphite Powder A part of the expanded graphite sheet obtained in Example 1 (1) was pulverized by the same pulverizer so as to have an average particle diameter of 20 μm, and 90 g of expanded graphite was obtained. A powder was produced. (2) Production of Fuel Cell Separator Except that 56 g of the expanded graphite powder obtained in Comparative Example 1 (1) was used, a rib-like projection having a good appearance was formed by the same composition and method as in Example 1. A separator for a fuel cell was manufactured.
【００２７】上記実施例１、２、３及び比較例１で製造
した燃料電池用セパレータの外観と、各セパレータのリ
ブ部を平らに研磨し厚さ１．５mmの平板を作製し、曲げ
強さ及び電気抵抗を測定した。結果を表１に示す。The appearance of the fuel cell separators produced in Examples 1, 2, and 3 and Comparative Example 1, and the ribs of each separator were polished flat to produce a 1.5 mm thick flat plate, and the bending strength was measured. And the electrical resistance was measured. Table 1 shows the results.
【００２８】[0028]
【表１】 [Table 1]
【００２９】[0029]
【発明の効果】請求項１及び２記載の燃料電池用セパレ
ータは、電気抵抗、ガス透過性、液膨潤性、機械的強度
等のセパレータ特性において優れ、経済性にも優れる。
請求項３及び４記載の燃料電池用セパレータの製造方法
によれば、電気抵抗、ガス透過性、液膨潤性、機械的強
度等のセパレータ特性において優れ、成形性の良好な燃
料電池用セパレータを簡易な工程で安価に、かつ安定に
生産できる。請求項５及び６記載の燃料電池は、セパレ
ータの電気抵抗、ガス透過性、液膨潤性、機械的強度等
の特性が優れ、高性能である。The fuel cell separator according to the first and second aspects is excellent in separator characteristics such as electric resistance, gas permeability, liquid swelling property and mechanical strength, and is also excellent in economic efficiency.
According to the method for manufacturing a fuel cell separator according to the third and fourth aspects, a separator for a fuel cell which is excellent in separator characteristics such as electric resistance, gas permeability, liquid swelling property and mechanical strength and has good moldability can be easily prepared. Inexpensive and stable production with simple processes. The fuel cell according to claims 5 and 6 has excellent properties such as electrical resistance, gas permeability, liquid swelling property, and mechanical strength of the separator, and has high performance.
【図１】本発明の燃料電池用セパレータの一例を示す斜
視図であり、（ａ）は両面にリブが存在するもの、
（ｂ）は片面にリブが存在するものである。FIG. 1 is a perspective view showing an example of a fuel cell separator of the present invention, wherein (a) shows a separator having ribs on both surfaces;
(B) has a rib on one side.
【図２】本発明の燃料電池の一例を示す斜視図である。FIG. 2 is a perspective view showing an example of the fuel cell of the present invention.
１ セパレータ ２ リブ部 ３ 溝部 ４ セル ５ 固体高分子電解質膜 ６ 燃料極 ７ 空気極 ８ ３層膜 ９ａ、９ｂ セパレータ １０ セルスタック DESCRIPTION OF SYMBOLS 1 Separator 2 Rib part 3 Groove part 4 Cell 5 Solid polymer electrolyte membrane 6 Fuel electrode 7 Air electrode 8 Three-layer membrane 9a, 9b Separator 10 Cell stack
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤田 淳 茨城県日立市鮎川町三丁目３番１号 日立 化成工業株式会社山崎工場内 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Jun Fujita 3-3-1 Ayukawacho, Hitachi City, Ibaraki Prefecture Inside the Hitachi Chemical Co., Ltd. Yamazaki Plant
Claims (6)
樹脂中に分散されてなる燃料電池用セパレータ。1. A fuel cell separator in which expanded graphite powder having an average particle size of 50 μm or more is dispersed in a resin.
１記載の燃料電池用セパレータ。2. The fuel cell separator according to claim 1, wherein the fuel cell is a solid polymer type.
熱硬化性樹脂又は熱可塑性樹脂を含む混合物を成形する
ことを特徴とする燃料電池用セパレータの製造方法。3. A method for producing a fuel cell separator, comprising molding a mixture containing expanded graphite powder having an average particle size of 50 μm or more and a thermosetting resin or a thermoplastic resin.
求項３記載の燃料電池用セパレータの製造方法。4. The method for producing a fuel cell separator according to claim 3, wherein the resin used is a phenol resin.
請求項３若しくは４に記載される製造方法により得られ
るセパレータを有してなる燃料電池。5. A fuel cell comprising a separator according to claim 1 or 2, or a separator obtained by the production method according to claim 3.
電池。6. The fuel cell according to claim 5, wherein the fuel cell is a solid polymer type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07177999A JP3455466B2 (en) | 1998-04-07 | 1999-03-17 | Fuel cell and fuel cell separator |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10-94441 | 1998-04-07 | ||
| JP9444198 | 1998-04-07 | ||
| JP07177999A JP3455466B2 (en) | 1998-04-07 | 1999-03-17 | Fuel cell and fuel cell separator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11354136A true JPH11354136A (en) | 1999-12-24 |
| JP3455466B2 JP3455466B2 (en) | 2003-10-14 |
Family
ID=26412878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07177999A Expired - Fee Related JP3455466B2 (en) | 1998-04-07 | 1999-03-17 | Fuel cell and fuel cell separator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3455466B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001325967A (en) * | 2000-05-15 | 2001-11-22 | Nisshinbo Ind Inc | Manufacturing method of fuel cell separator, fuel cell separator and solid polymer fuel cell |
| KR20020094908A (en) * | 2001-06-13 | 2002-12-18 | 마쯔시다덴기산교 가부시키가이샤 | Method for producing fuel cell, and fuel cell |
| JP2002367623A (en) * | 2001-06-05 | 2002-12-20 | Hitachi Chem Co Ltd | Fuel cell separator and fuel cell using the same |
| EP1246284A3 (en) * | 2001-03-27 | 2004-08-25 | Nichias Corporation | Fuel cell separator and method for manufacturing the same |
| EP1610405A3 (en) * | 2004-06-19 | 2006-05-17 | Hankook Tire Co., Ltd. | Carbon composite material for fuel cell separator, preparation thereof and fuel cell separator utilizing the same |
| US7147960B2 (en) | 2000-07-24 | 2006-12-12 | Commissariat A L'energie Atomique | Conductive composite material and electrode for fuel cell using said material formed by thermo-compression |
| DE10342199B4 (en) * | 2003-09-13 | 2007-02-08 | Daimlerchrysler Ag | Method for producing a gas diffusion layer for a fuel cell |
| US7182887B2 (en) | 2000-07-24 | 2007-02-27 | Commissariat A L'energie Atomique | Conductive composite material and fuel cell electrode using same |
| US7547403B2 (en) | 2003-07-02 | 2009-06-16 | Polyplastics Co., Ltd. | Electroconductive resin composition |
| JP2013516374A (en) * | 2009-12-31 | 2013-05-13 | エスゲーエル カーボン ソシエタス ヨーロピア | Graphite-containing molded body and method for producing the same |
-
1999
- 1999-03-17 JP JP07177999A patent/JP3455466B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001325967A (en) * | 2000-05-15 | 2001-11-22 | Nisshinbo Ind Inc | Manufacturing method of fuel cell separator, fuel cell separator and solid polymer fuel cell |
| US7147960B2 (en) | 2000-07-24 | 2006-12-12 | Commissariat A L'energie Atomique | Conductive composite material and electrode for fuel cell using said material formed by thermo-compression |
| US7182887B2 (en) | 2000-07-24 | 2007-02-27 | Commissariat A L'energie Atomique | Conductive composite material and fuel cell electrode using same |
| EP1246284A3 (en) * | 2001-03-27 | 2004-08-25 | Nichias Corporation | Fuel cell separator and method for manufacturing the same |
| US6884538B2 (en) | 2001-03-27 | 2005-04-26 | Nichias Corporation | Fuel cell separator and method for manufacturing the same |
| JP2002367623A (en) * | 2001-06-05 | 2002-12-20 | Hitachi Chem Co Ltd | Fuel cell separator and fuel cell using the same |
| KR20020094908A (en) * | 2001-06-13 | 2002-12-18 | 마쯔시다덴기산교 가부시키가이샤 | Method for producing fuel cell, and fuel cell |
| US7547403B2 (en) | 2003-07-02 | 2009-06-16 | Polyplastics Co., Ltd. | Electroconductive resin composition |
| DE10342199B4 (en) * | 2003-09-13 | 2007-02-08 | Daimlerchrysler Ag | Method for producing a gas diffusion layer for a fuel cell |
| EP1610405A3 (en) * | 2004-06-19 | 2006-05-17 | Hankook Tire Co., Ltd. | Carbon composite material for fuel cell separator, preparation thereof and fuel cell separator utilizing the same |
| JP2013516374A (en) * | 2009-12-31 | 2013-05-13 | エスゲーエル カーボン ソシエタス ヨーロピア | Graphite-containing molded body and method for producing the same |
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|---|---|
| JP3455466B2 (en) | 2003-10-14 |
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