JPH09245811A - Manufacture of solid electrolyte fuel cell - Google Patents
Manufacture of solid electrolyte fuel cellInfo
- Publication number
- JPH09245811A JPH09245811A JP8054699A JP5469996A JPH09245811A JP H09245811 A JPH09245811 A JP H09245811A JP 8054699 A JP8054699 A JP 8054699A JP 5469996 A JP5469996 A JP 5469996A JP H09245811 A JPH09245811 A JP H09245811A
- Authority
- JP
- Japan
- Prior art keywords
- solid electrolyte
- air electrode
- electrode
- molded body
- fuel cell
- 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.)
- Pending
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
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- Inert Electrodes (AREA)
- Fuel Cell (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は固体電解質型燃料電
池の製造方法に関する。TECHNICAL FIELD The present invention relates to a method for manufacturing a solid oxide fuel cell.
【０００２】[0002]
【従来の技術】固体電解質型燃料電池は、燃料極、固体
電解質膜及び空気極の各層を互いに配置、積層して３層
を構成し、これを燃料電池の発電部として、外部から燃
料極に燃料ガスを供給し、空気極に空気を供給して、電
気を発生させるものである。2. Description of the Related Art In a solid oxide fuel cell, each layer of a fuel electrode, a solid electrolyte membrane and an air electrode is arranged on each other and laminated to form three layers. Fuel gas is supplied and air is supplied to the air electrode to generate electricity.
【０００３】そして、平板型の固体電解質型燃料電池
は、燃料極、固体電解質膜及び空気極の各層が平板状で
あり、それぞれ平坦な面を相互に積層したものである。
なお、空気極を酸素極と呼んでこれに酸素ガスを供給す
る場合もある。In the flat plate type solid oxide fuel cell, each layer of the fuel electrode, the solid electrolyte membrane and the air electrode has a flat plate shape, and flat surfaces are laminated on each other.
The air electrode may be called an oxygen electrode and oxygen gas may be supplied to the air electrode.
【０００４】[0004]
【発明が解決しようとする課題】この固体電解質型燃料
電池における電極反応は、固体電解質と各電極と気相と
の三相界面で起こると考えられており、固体電解質型燃
料電池の発電性能を向上させるためには、三相界面の面
積を広くすることが必要である。The electrode reaction in this solid oxide fuel cell is considered to occur at the three-phase interface between the solid electrolyte, each electrode, and the gas phase, and the power generation performance of the solid oxide fuel cell is improved. In order to improve, it is necessary to widen the area of the three-phase interface.
【０００５】このために、従来より、電極材料に粒径の
小さい粒子を採用し、電極を微細構造化して実効電極面
積を広くする方法が知られているが、発電性能はまだ満
足の行くものではなかった。For this reason, conventionally, a method has been known in which particles having a small particle diameter are adopted as an electrode material to make the electrode finely structured to widen the effective electrode area, but the power generation performance is still satisfactory. Was not.
【０００６】そこで本発明の目的は、実効電極面積をよ
り広くして発電性能を向上させることができる固体電解
質型燃料電池の製造方法を提供することにある。[0006] Therefore, an object of the present invention is to provide a method for manufacturing a solid oxide fuel cell, which can increase the effective electrode area and improve the power generation performance.
【０００７】[0007]
【課題を解決するための手段】本発明は、請求項１にお
いて、固体電解質型燃料電池の製造方法は、空気極材料
と固体電解質材料の粗粉または空気極材料の粗粉との混
合スラリーを準備し、該混合スラリーを成形して表面を
粗面化した空気極用セラミック成形体とし、該粗面化し
た空気極用セラミック成形体表面に固体電解質膜用セラ
ミック成形体を配置し、さらに該固体電解質膜用セラミ
ック成形体表面に燃料極用セラミック成形体を配置して
積層体を形成し、その後該積層体を焼成することを特徴
とする。According to a first aspect of the present invention, in a method for manufacturing a solid oxide fuel cell, a mixed slurry of an air electrode material and a coarse powder of a solid electrolyte material or a coarse powder of an air electrode material is used. Prepared, the mixed slurry is molded into a roughened surface of the ceramic body for air electrode, and the surface of the roughened ceramic body for air electrode is provided with the ceramic molded body for solid electrolyte membrane. It is characterized in that the ceramic molded body for fuel electrode is arranged on the surface of the ceramic molded body for solid electrolyte membrane to form a laminated body, and then the laminated body is fired.
【０００８】また、請求項２において、前記粗粉は平均
粒径が１０μｍ以上で空気極用セラミック成形体の厚み
を超えないことを特徴とする。In the second aspect, the coarse powder has an average particle size of 10 μm or more and does not exceed the thickness of the ceramic molded body for air electrode.
【０００９】上記のように、空気極材料と固体電解質材
料の粗粉または空気極材料の粗粉とを混合したスラリー
にて空気極となるセラミック成形体を作り、これを用い
た固体電解質型燃料電池を製造すると、空気極と固体電
解質膜との積層界面を容易に粗面化することができるの
で、空気極と固体電解質膜を平坦な面で積層する場合よ
りも電極の実効電極面積を広くすることができる。As described above, a ceramic molded body to be an air electrode is made from a slurry obtained by mixing the air electrode material and the coarse powder of the solid electrolyte material or the coarse powder of the air electrode material, and the solid electrolyte fuel using this is formed. When a battery is manufactured, the laminated interface between the air electrode and the solid electrolyte membrane can be easily roughened, so the effective electrode area of the electrode is wider than when the air electrode and the solid electrolyte membrane are laminated on a flat surface. can do.
【００１０】[0010]
【発明の実施の形態】以下、本発明にかかる固体電解質
型燃料電池の製造方法の実施例につき説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a method for manufacturing a solid oxide fuel cell according to the present invention will be described below.
【００１１】（実施例１）この実施例は、空気極材料粉
末と固体電解質材料の粗粉とを混合してスラリーを作
り、これを成形することにより、空気極と固体電解質膜
との積層界面を粗面化して固体電解質型燃料電池を作製
した例である。Example 1 In this example, an air electrode material powder and a coarse powder of a solid electrolyte material are mixed to form a slurry, which is then molded to form a laminated interface between the air electrode and the solid electrolyte membrane. This is an example of producing a solid oxide fuel cell by roughening.
【００１２】まず、空気極用セラミックグリーンシート
の製造方法について説明する。First, a method of manufacturing a ceramic green sheet for an air electrode will be described.
【００１３】平均粒径１μｍの粉末状のランタンマンガ
ナイトに対して、結合剤（例えば、ポリビニルブチラー
ル系バインダ）及び溶剤（エタノール及びトルエン）を
所定量加えてスラリー化した。そして、成形直前にこの
スラリーに、平均粒径３０μｍのイットリア安定化ジル
コニアからなる固体電解質セラミック材料の粗粉を所定
量添加して十分に混合した。A predetermined amount of a binder (for example, polyvinyl butyral binder) and a solvent (ethanol and toluene) was added to powdery lanthanum manganite having an average particle diameter of 1 μm to form a slurry. Immediately before molding, a predetermined amount of coarse powder of a solid electrolyte ceramic material made of yttria-stabilized zirconia having an average particle diameter of 30 μm was added to this slurry and sufficiently mixed.
【００１４】次に、ドクターブレード法によって、この
スラリーから厚さ５０μｍの空気極用セラミックグリー
ンシートを成形した。得られた空気極用セラミックグリ
ーンシートは、スラリーに固体電解質セラミック材料の
粗粉を混ぜたことにより、セラミックグリーンシートの
表面が、スラリーに混ぜた粗粉の大きさと量に応じた凹
凸が生じ、粗面化されていた。Next, a 50 μm thick ceramic green sheet for an air electrode was formed from this slurry by the doctor blade method. The obtained air electrode ceramic green sheet, by mixing the coarse powder of the solid electrolyte ceramic material in the slurry, the surface of the ceramic green sheet, unevenness depending on the size and amount of the coarse powder mixed in the slurry, It was roughened.
【００１５】一方、固体電解質膜用セラミックグリーン
シートを作製するため、平均粒径１μｍの粉末状のイッ
トリア安定化ジルコニアに、結合剤（例えば、ポリビニ
ルブチラール系バインダ）及び溶剤（エタノール及びト
ルエン）を所定量加えてスラリー化した。On the other hand, in order to prepare a ceramic green sheet for a solid electrolyte membrane, a powdery yttria-stabilized zirconia having an average particle size of 1 μm, a binder (for example, polyvinyl butyral binder) and a solvent (ethanol and toluene) are added. A fixed amount was added to form a slurry.
【００１６】続いて、このスラリーを用いて、前記粗面
化された空気極用セラミックグリーンシートの表面上
に、ドクターブレード法により、厚さ５０μｍの固体電
解質のセラミックグリーンシートを成形した。Subsequently, using this slurry, a 50 μm thick solid electrolyte ceramic green sheet was formed on the surface of the roughened ceramic green sheet for an air electrode by the doctor blade method.
【００１７】次に、平坦な積層界面を持つ固体電解質膜
と燃料極の積層成形体を作製した。Next, a laminated molded body of a solid electrolyte membrane having a flat laminated interface and a fuel electrode was prepared.
【００１８】すなわち、まず、固体電解質膜を作製する
ため、平均粒径１μｍのイットリア安定化ジルコニアに
対して、結合剤（例えば、ポリビニルブチラール系バイ
ンダ）及び溶剤（エタノール及びトルエン）を所定量加
えてスラリー化した。That is, first, in order to prepare a solid electrolyte membrane, a binder (for example, polyvinyl butyral binder) and a solvent (ethanol and toluene) are added in a predetermined amount to yttria-stabilized zirconia having an average particle diameter of 1 μm. It was made into a slurry.
【００１９】そして、ドクターブレード法によって、こ
のスラリーから厚さ５０μｍの固体電解質のセラミック
グリーンシートを成形した。Then, a 50 μm thick solid electrolyte ceramic green sheet was formed from this slurry by the doctor blade method.
【００２０】また、燃料極用セラミックグリーンシート
を作製するため、平均粒径１μｍの粉末状の酸化ニッケ
ルとイットリア安定化ジルコニアの混合物に、結合剤
（例えば、ポリビニルブチラール系バインダ）及び溶剤
（エタノール及びトルエン）を所定量加えてスラリー化
した。In order to prepare a ceramic green sheet for a fuel electrode, a mixture of powdery nickel oxide having an average particle size of 1 μm and yttria-stabilized zirconia, a binder (for example, polyvinyl butyral binder) and a solvent (ethanol and ethanol) are used. A predetermined amount of toluene) was added to form a slurry.
【００２１】そして、このスラリーを用いて、ドクター
ブレード法により、厚さ５０μｍの燃料極用セラミック
グリーンシートを成形した。Using this slurry, a 50 μm thick ceramic green sheet for fuel electrode was formed by the doctor blade method.
【００２２】得られた固体電解質のセラミックグリーン
シートと燃料極のセラミックグリーンシートを互いに積
層して成形体を作製した。The obtained solid electrolyte ceramic green sheet and the fuel electrode ceramic green sheet were laminated on each other to prepare a molded body.
【００２３】このようにして得た各一対のグリーンシー
ト積層体、すなわち、固体電解質セラミック材料の粗粉
により粗面化された積層界面を持つ、固体電解質のセラ
ミックグリーンシートと空気極のセラミックグリーンシ
ートの積層体と、平坦な積層界面を持つ固体電解質のセ
ラミックグリーンシートと燃料極のセラミックグリーン
シートの積層体を、それぞれ固体電解質のセラミックグ
リーンシートが向き合うようにして配置し、その間に、
粗粉を含まない追加の固体電解質のセラミックグリーン
シートを数枚挿入して重ね合わせた。Each pair of green sheet laminates thus obtained, that is, a solid electrolyte ceramic green sheet and an air electrode ceramic green sheet having a lamination interface roughened by a coarse powder of a solid electrolyte ceramic material. And a laminated body of a solid electrolyte ceramic green sheet and a fuel electrode ceramic green sheet having a flat laminated interface are arranged so that the solid electrolyte ceramic green sheets face each other, and in between,
Several additional solid electrolyte ceramic green sheets without coarse powder were inserted and stacked.
【００２４】そして、この空気極、固体電解質膜及び燃
料極の各セラミックグリーンシートよりなる積層体をプ
ラスチック製の袋にいれ、袋の中を真空状態にし、温間
静水圧プレス機を用いて圧着し、空気極、固体電解質膜
及び燃料極の３層膜積層体を得た。Then, the laminated body composed of the ceramic green sheets of the air electrode, the solid electrolyte membrane and the fuel electrode is put in a plastic bag, the inside of the bag is evacuated, and a pressure is applied using a warm isostatic press. Then, a three-layer film laminate of the air electrode, the solid electrolyte membrane and the fuel electrode was obtained.
【００２５】この結果、第１図の断面図に示すように、
固体電解質膜のセラミック成形体層１ａのうち、固体電
解質膜のセラミック成形体１ｃは、粗面化された空気極
用セラミック成形体３ａの表面の凹凸に沿って成形され
たので、固体電解質膜のセラミック成形体１ｃと空気極
用セラミック成形体３ａの積層界面４ｂが凹凸状態とな
り、また、もう一方の固体電解質膜のセラミック成形体
１ｂと燃料極用セラミック成形体２ａの積層界面４ａは
平坦な状態で得られた。なお、１ｄは追加挿入した固体
電解質膜のセラミック成形体を示す。As a result, as shown in the sectional view of FIG.
In the ceramic molded body layer 1a of the solid electrolyte membrane, the ceramic molded body 1c of the solid electrolyte membrane is molded along the unevenness of the surface of the roughened air electrode ceramic molded body 3a. The laminated interface 4b between the ceramic molded body 1c and the air electrode ceramic molded body 3a becomes uneven, and the laminated interface 4a between the other solid electrolyte membrane ceramic molded body 1b and the fuel electrode ceramic molded body 2a is flat. Obtained in. In addition, 1d shows the ceramic molded body of the solid electrolyte membrane additionally inserted.
【００２６】この圧着後、プラスチック製の袋から取り
出し、空気極、固体電解質膜及び燃料極の３層の積層体
を１３００℃の温度で２時間焼成した。After this pressure bonding, the product was taken out from the plastic bag, and the three-layer laminate of the air electrode, the solid electrolyte membrane and the fuel electrode was fired at a temperature of 1300 ° C. for 2 hours.
【００２７】こうして得られた電極付き固体電解質膜を
備えた３層の固体電解質型燃料電池を、図２に示すよう
に結線し発電特性を測定した。The three-layer solid oxide fuel cell having the solid electrolyte membrane with electrodes thus obtained was connected as shown in FIG. 2 and the power generation characteristics were measured.
【００２８】図２において、１ｅは固体電解質膜、２ｂ
は燃料極、３ｂは空気極、６は固体電解質型燃料電池で
ある。また、７は燃料ガス供給管、８は空気供給管、９
は白金線、１０は可変抵抗器、１１はオシロスコープ、
１２は電流計、１３は水銀スイッチである。In FIG. 2, 1e is a solid electrolyte membrane, 2b.
Is a fuel electrode, 3b is an air electrode, and 6 is a solid oxide fuel cell. Further, 7 is a fuel gas supply pipe, 8 is an air supply pipe, and 9
Is a platinum wire, 10 is a variable resistor, 11 is an oscilloscope,
12 is an ammeter and 13 is a mercury switch.
【００２９】そして、固体電解質型燃料電池６を１００
０℃の温度に保持しながら、燃料ガス供給管７と空気供
給管８を通して、燃料ガスと空気をそれぞれ燃料極２
ｂ、空気極３ｂに供給し、固体電解質膜１ｅを介して電
極反応を起こさせた。そして、電流計１２で観察しなが
ら、３００ｍＡ／ｃｍ2 の電流が流れる状態における空
気極３ｂの分極による電圧降下を、カレントインターラ
プト法によりオシロスコープ１１で測定した。Then, the solid oxide fuel cell 6 is set to 100
While maintaining the temperature at 0 ° C., the fuel gas and the air are respectively fed through the fuel gas supply pipe 7 and the air supply pipe 8 to the fuel electrode 2
b, supplied to the air electrode 3b, and caused an electrode reaction through the solid electrolyte membrane 1e. Then, while observing with the ammeter 12, the voltage drop due to the polarization of the air electrode 3b in the state where the current of 300 mA / cm 2 flows was measured with the oscilloscope 11 by the current interrupt method.
【００３０】この測定結果を表１に示す。The results of this measurement are shown in Table 1.
【００３１】[0031]
【表１】 [Table 1]
【００３２】また、比較例として、それぞれ粗粉を含ま
ず表面が滑らかな固体電解質のセラミックグリーンシー
ト、燃料極用セラミックグリーンシ−ト及び空気極用セ
ラミックグリーンシートを別々に成形して、これらを積
層したもので作製した固体電解質型燃料電池、すなわ
ち、固体電解質膜と各電極の積層界面が平坦な固体電解
質型燃料電池の測定結果も併せて示す。As a comparative example, a solid electrolyte ceramic green sheet which does not contain coarse powder and has a smooth surface, a fuel electrode ceramic green sheet and an air electrode ceramic green sheet are separately molded, and these are prepared. The measurement results of a solid oxide fuel cell manufactured by stacking, that is, a solid oxide fuel cell in which the solid electrolyte membrane and each electrode have a flat laminated interface are also shown.
【００３３】（実施例２）この実施例は、空気極材料粉
末と空気極材料の粗粉とを混合してスラリーを作り、こ
れを成形することにより、空気極と固体電解質膜との積
層界面を粗面化し、固体電解質型燃料電池を作製した例
である。(Embodiment 2) In this embodiment, the air electrode material powder and the coarse powder of the air electrode material are mixed to form a slurry, which is then molded to form a laminated interface between the air electrode and the solid electrolyte membrane. It is an example of producing a solid oxide fuel cell by roughening.
【００３４】まず、実施例１で用いた固体電解質材料の
粗粉に代えて、ランタンマンガナイトからなる平均粒径
３０μｍの空気極用セラミック材料の粗粉を添加するこ
と以外は、実施例１と同様にして、この粗粉によりその
表面に凹凸が生じて粗面化された空気極用セラミックグ
リーンシートを得た。First, in place of the coarse powder of the solid electrolyte material used in Example 1, coarse powder of a ceramic material for an air electrode made of lanthanum manganite having an average particle size of 30 μm was added, and the same procedure as in Example 1 was performed. Similarly, a ceramic green sheet for an air electrode was obtained, which was roughened by roughening its surface by this coarse powder.
【００３５】続いて、実施例１と同様にして、前記粗面
化された空気極用セラミックグリーンシートの表面上
に、固体電解質のセラミックグリーンシートを成形し
た。Then, in the same manner as in Example 1, a solid electrolyte ceramic green sheet was formed on the surface of the roughened ceramic green sheet for an air electrode.
【００３６】次に、同じく実施例１と同様にして、平坦
な積層界面を持つ固体電解質膜と燃料極の積層成形体を
作製した。Next, in the same manner as in Example 1, a laminated molded body of a solid electrolyte membrane having a flat laminated interface and a fuel electrode was prepared.
【００３７】このようにして得た各一対のセラミックグ
リーンシート積層体を、実施例１と同様にして重ね合わ
せ、この積層体を圧着して、空気極、固体電解質膜及び
燃料極の３層膜積層体を得た。The pair of ceramic green sheet laminates thus obtained were laminated in the same manner as in Example 1, and the laminates were pressure-bonded to each other to form a three-layer film including an air electrode, a solid electrolyte membrane and a fuel electrode. A laminated body was obtained.
【００３８】この結果、実施例１と同様に、固体電解質
膜のセラミック成形体は、粗面化された空気極用セラミ
ック成形体の表面の凹凸に沿って成形されたので、固体
電解質膜のセラミック成形体と空気極用セラミック成形
体の積層界面が凹凸状態になって得られた。また、もう
一方の固体電解質膜のセラミック成形体と燃料極用セラ
ミック成形体の積層界面は平坦であった。As a result, as in Example 1, since the ceramic molded body of the solid electrolyte membrane was molded along the unevenness of the surface of the roughened ceramic molded body for the air electrode, the ceramic of the solid electrolyte membrane was formed. The laminated interface between the molded body and the ceramic molded body for air electrode was obtained in an uneven state. In addition, the laminated interface between the other ceramic molded body of the solid electrolyte membrane and the ceramic molded body for the fuel electrode was flat.
【００３９】この圧着後、実施例１と同様にして、空気
極、固体電解質膜及び燃料極の３層の積層体を焼成し
た。After this pressure bonding, a three-layer laminate of an air electrode, a solid electrolyte membrane and a fuel electrode was fired in the same manner as in Example 1.
【００４０】こうして得られた電極付き固体電解質膜を
備えた３層の固体電解質型燃料電池を、実施例１と同
様、図２に示すように結線し発電特性を測定した。そし
て、この測定においても結果は実施例１と同じ傾向を示
した。The three-layer solid electrolyte type fuel cell provided with the solid electrolyte membrane with electrodes thus obtained was connected as shown in FIG. The result also showed the same tendency as in Example 1 in this measurement.
【００４１】次に、この測定結果について考察する。Next, the measurement results will be considered.
【００４２】この分極による電圧降下の値が小さいほ
ど、電極の実効面積が広く、かつ、燃料電池としての性
能も優れていることになる。表１によれば、実施例品が
比較例品よりも分極による電圧降下の値が小さいことが
示され、したがって、実施例品が比較例品よりも実効電
極面積が広いことがわかる。The smaller the value of the voltage drop due to the polarization, the larger the effective area of the electrode and the better the performance as a fuel cell. Table 1 shows that the example product has a smaller value of voltage drop due to polarization than the comparative example product. Therefore, it is understood that the example product has a larger effective electrode area than the comparative example product.
【００４３】また、図１に示した断面図に基づいて、積
層界面４ｂの実効電極面積を計算すると、積層面が平坦
である場合の約１．２倍となる。ところが、表１に示さ
れた実施例品の分極による電圧降下は、比較例品の１／
２程度まで下がっている。これは、積層界面の凹凸によ
り、固体電解質膜と空気極の接触面積が広くなって密着
力が強くなり、それにより固体電解質型燃料電池の内部
インピーダンスが低くなったためであると考えられる。Further, when the effective electrode area of the laminated interface 4b is calculated based on the sectional view shown in FIG. 1, it is about 1.2 times as large as that when the laminated surface is flat. However, the voltage drop due to polarization of the example product shown in Table 1 is 1/100 of that of the comparative product.
It has dropped to about 2. It is considered that this is because the contact area between the solid electrolyte membrane and the air electrode was widened due to the unevenness of the stacking interface, and the adhesion was strengthened, thereby lowering the internal impedance of the solid oxide fuel cell.
【００４４】なお、電極反応は、固体電解質、空気極、
気相の三相の界する点で起こるため、この点が多いほど
発電性能が上がる。空気極中の固体電解質セラミック粒
子相互のつながり、または、固体電解質セラミック中の
空気極セラミック材料粒子相互のつながり状況により、
電極反応点の存在範囲は固体電解質と空気極の界面から
１０μｍ程度の範囲に制限されることがわかっている。
電極反応点を増やすためには、固体電解質セラミック粒
子や空気極セラミック材料粒子を小さくする方法がある
ほかに、本願発明のように固体電解質と空気極との界面
を粗面化する方法がある。粗面のピッチが１０μｍより
細かいと効果は小さく、また、ピッチがはるかに粗いと
効果は小さい。したがって、界面を粗面化する粗粉の平
均粒径は、実際に空気極中の反応に関与する部分が電解
質層との界面から約１０μｍの範囲にあるところから、
１０μｍを下限値とし、空気極用セラミック成形体の厚
みを超えない範囲を上限値とした。The electrode reaction is carried out by using a solid electrolyte, an air electrode,
Since it occurs at the point where the three phases of the gas phase meet, the higher this point, the higher the power generation performance. Depending on the connection state of the solid electrolyte ceramic particles in the air electrode, or the connection state of the air electrode ceramic material particles in the solid electrolyte ceramic,
It is known that the existence range of the electrode reaction point is limited to the range of about 10 μm from the interface between the solid electrolyte and the air electrode.
In order to increase the number of electrode reaction points, there is a method of reducing the size of the solid electrolyte ceramic particles and air electrode ceramic material particles, and a method of roughening the interface between the solid electrolyte and the air electrode as in the present invention. The effect is small when the pitch of the rough surface is smaller than 10 μm, and the effect is small when the pitch is much coarser. Therefore, the average particle diameter of the coarse powder for roughening the interface is such that the portion actually involved in the reaction in the air electrode is in the range of about 10 μm from the interface with the electrolyte layer,
The lower limit was 10 μm and the upper limit was a range not exceeding the thickness of the air electrode ceramic molded body.
【００４５】このように本発明は、固体電解質膜と空気
極との界面を容易に粗面化することができるので、従来
のように固体電解質膜と空気極とを平坦な面で積層した
場合よりも、実効電極面積を広くすることできる。As described above, according to the present invention, since the interface between the solid electrolyte membrane and the air electrode can be easily roughened, when the solid electrolyte membrane and the air electrode are laminated on a flat surface as in the conventional case. The effective electrode area can be made wider than that.
【００４６】[0046]
【発明の効果】以上のように、本発明によれば、固体電
解質膜と空気極との積層界面を容易に粗面化することが
できるので、従来のように平面で積層した場合よりも、
電極の実効面積を広くすることができる。この結果、固
体電解質型燃料電池の発電性能を向上させることが可能
になる。As described above, according to the present invention, it is possible to easily roughen the laminated interface between the solid electrolyte membrane and the air electrode.
The effective area of the electrode can be increased. As a result, the power generation performance of the solid oxide fuel cell can be improved.
【００４７】また、固体電解質と空気極の接触面積が広
くなって密着力が強くなり、燃料電池の内部インピーダ
ンスを低くすることができる。そしてこの内部インピ−
ダンスの低下も、燃料電池の発電性能の向上に寄与する
という副次的な効果がある。Further, the contact area between the solid electrolyte and the air electrode is widened and the adhesion is strengthened, so that the internal impedance of the fuel cell can be lowered. And this internal impedance
The decrease in the dance also has the secondary effect of contributing to the improvement of the power generation performance of the fuel cell.
【図１】本発明の一実施例における電極成形体を両面に
設けた固体電解質膜セラミック成形体の断面図である。FIG. 1 is a cross-sectional view of a solid electrolyte membrane ceramic molded body provided with electrode molded bodies on both surfaces according to an embodiment of the present invention.
【図２】固体電解質型燃料電池の発電特性を測定するた
めの結線図である。FIG. 2 is a connection diagram for measuring power generation characteristics of a solid oxide fuel cell.
１ａ 固体電解質膜のセラミック成形体層 １ｂ，１ｃ 固体電解質膜のセラミック成形体 １ｄ 追加挿入した固体電解質膜のセラミック成
形体 １ｅ 固体電解質膜 ２ａ 燃料極用セラミック成形体 ２ｂ 燃料極 ３ａ 空気極用セラミック成形体 ３ｂ 空気極 ６ 固体電解質型燃料電池1a Solid Electrolyte Membrane Ceramic Molded Layer 1b, 1c Solid Electrolyte Membrane Ceramic Molded Body 1d Solid Electrolyte Membrane Ceramic Molded Body 1e Solid Electrolyte Membrane 2a Fuel Electrode Ceramic Molded Body 2b Fuel Electrode 3a Air Electrode Ceramic Molded Body Body 3b Air electrode 6 Solid oxide fuel cell
Claims (2)
は空気極材料の粗粉との混合スラリーを準備し、該混合
スラリーを成形して表面を粗面化した空気極用セラミッ
ク成形体とし、該粗面化した空気極用セラミック成形体
表面に固体電解質膜用セラミック成形体を配置し、さら
に該固体電解質膜用セラミック成形体表面に燃料極用セ
ラミック成形体を配置して積層体を形成し、その後該積
層体を焼成することを特徴とする固体電解質型燃料電池
の製造方法。1. A mixed slurry of an air electrode material and a coarse powder of a solid electrolyte material or a coarse powder of an air electrode material is prepared, and the mixed slurry is molded to obtain a ceramic molded body for an air electrode having a roughened surface. A laminate is formed by disposing a ceramic molded body for a solid electrolyte membrane on the surface of the roughened ceramic molded body for an air electrode, and further disposing a ceramic molded body for a fuel electrode on the surface of the ceramic molded body for a solid electrolyte membrane. And then firing the laminate, a method for producing a solid oxide fuel cell.
空気極用セラミック成形体の厚みを超えないことを特徴
とする請求項１記載の固体電解質型燃料電池の製造方
法。2. The coarse powder has an average particle size of 10 μm or more,
The method for producing a solid oxide fuel cell according to claim 1, wherein the thickness of the air electrode ceramic molded body is not exceeded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8054699A JPH09245811A (en) | 1996-03-12 | 1996-03-12 | Manufacture of solid electrolyte fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8054699A JPH09245811A (en) | 1996-03-12 | 1996-03-12 | Manufacture of solid electrolyte fuel cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09245811A true JPH09245811A (en) | 1997-09-19 |
Family
ID=12978059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8054699A Pending JPH09245811A (en) | 1996-03-12 | 1996-03-12 | Manufacture of solid electrolyte fuel cell |
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| Country | Link |
|---|---|
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