JP6235554B2 - 高分子電解質膜、その製造方法及びそれを含む膜−電極アセンブリ - Google Patents
高分子電解質膜、その製造方法及びそれを含む膜−電極アセンブリ Download PDFInfo
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Description
多孔度(%)=(空気の体積/全体積)×100
2)初期性能の測定:IVカーブ測定
燃料電池のセル性能の測定装置を用いて、電圧による電流密度の変化を測定した。
3)接着強度:テープによる接着強度測定
電極に剥離強度測定用テープを一定圧で付着した後、これを剥がし、テープに付着された電極の量を測定して接着強度を測定した。前記接着強度の測定基準は、次の通りである。
X:肉眼観察基準、テープ面積のほとんどの部分に電極が付着した場合
△:肉眼観察基準、テープ面積の一部分に電極が付着した場合
○:肉眼観察基準、テープに電極がほとんど付着していない場合
Claims (18)
- イオン伝導性を有する、シートまたはフィルム状に形成されたか、または多孔性支持体中に充填された炭化水素系イオン伝導体層と、
前記炭化水素系イオン伝導体層の表面に非連続状に分散された、電極層に直接、接合するためのイオン伝導性を有するフッ素系イオン伝導体とを含み、
前記フッ素系イオン伝導体は、前記炭化水素系イオン伝導体層の表面に溶解接合されている、高分子電解質膜。 - 前記フッ素系イオン伝導体の非連続状分散は、複数のファイバー(fiber)状またはスポット(spot)状のフッ素系イオン伝導体が前記炭化水素系イオン伝導体層の表面に分散されたものである、請求項1に記載の高分子電解質膜。
- 前記ファイバー状のフッ素系イオン伝導体は、平均直径が0.005〜5μmである、請求項2に記載の高分子電解質膜。
- 前記ファイバー状のフッ素系イオン伝導体は、平均直径に対する平均長さの比率が100%以上である、請求項2に記載の高分子電解質膜。
- 前記スポット状のフッ素系イオン伝導体は、平均直径が0.005〜10μmである、請求項2に記載の高分子電解質膜。
- 前記フッ素系イオン伝導体は、前記高分子電解質膜全体100重量%に対して0.1〜10重量%含まれる、請求項1に記載の高分子電解質膜。
- 前記フッ素系イオン伝導体はパーフルオロスルホン酸(PFSA;Perfluorosulfonic acid)である、請求項1に記載の高分子電解質膜。
- 前記炭化水素系イオン伝導体は、スルホン化ポリイミド、スルホン化ポリアリールエーテルスルホン、スルホン化ポリエーテルエーテルケトン、スルホン化ポリベンズイミダゾール、スルホン化ポリスルホン、スルホン化ポリスチレン、スルホン化ポリホスファゼン及びこれらの組み合わせからなる群から選択されるいずれか一つである、請求項1に記載の高分子電解質膜。
- 前記高分子電解質膜は、
多孔性支持体と、
前記多孔性支持体の内部に充填された炭化水素系イオン伝導体と、
前記多孔性支持体の上下部に位置する炭化水素系イオン伝導体層と、
前記炭化水素系イオン伝導体層の表面に非連続状に分散されたフッ素系イオン伝導体とを含む、請求項1に記載の高分子電解質膜。 - 前記多孔性支持体は、ナイロン、ポリイミド、ポリベンズオキサゾール、ポリエチレンテレフタレート、ポリエチレン、ポリプロピレン、ポリテトラフルオロエチレン、ポリアリーレンエーテルスルホン、ポリエーテルエーテルケトン、これらの共重合体及びこれらの組み合わせからなる群から選択されるいずれか一つである、請求項9に記載の高分子電解質膜。
- イオン伝導性を有する、シートまたはフィルム状に形成されたか、または多孔性支持体中に充填された炭化水素系イオン伝導体層を形成する段階と、
前記炭化水素系イオン伝導体層の表面に、電極層に直接、接合するためのイオン伝導性を有するフッ素系イオン伝導体を非連続状に分散させる段階とを含み、
前記フッ素系イオン伝導体を非連続状に分散させる段階は、
前記炭化水素系イオン伝導体層の表面を溶解させることができる有機溶媒を含む、フッ素系イオン伝導体を形成するための溶液を製造する段階と、
前記フッ素系イオン伝導体を形成するための溶液を前記炭化水素系イオン伝導体層の表面に塗布する段階とを含む、高分子電解質膜の製造方法。 - 前記高分子電解質膜の製造方法は、
多孔性支持体を製造する段階と、
前記多孔性支持体の内部に炭化水素系イオン伝導体を充填させ、前記多孔性支持体の表面に炭化水素系イオン伝導体層を形成する段階と、
前記炭化水素系イオン伝導体層の表面にフッ素系イオン伝導体を非連続状に分散させる段階とを含む、請求項11に記載の高分子電解質膜の製造方法。 - 前記フッ素系イオン伝導体を非連続状に分散させる段階は、電気紡糸またはスプレー方法で行われる、請求項11に記載の高分子電解質膜の製造方法。
- 前記フッ素系イオン伝導体を形成するための溶液は、前記炭化水素系イオン伝導体層の表面を溶解させることができる有機溶媒を含む、請求項11に記載の高分子電解質膜の製造方法。
- 前記フッ素系イオン伝導体を形成するための溶液は、前記フッ素系イオン伝導体のアルコール分散液と、前記炭化水素系イオン伝導体層の表面を溶解させることができる有機溶媒とを混合して製造される、請求項14に記載の高分子電解質膜の製造方法。
- 前記炭化水素系イオン伝導体層の表面を溶解させることができる有機溶媒は、N−メチル−2−ピロリドン(N−methyl−2−pyrrolidine、NMP)、ジメチルホルムアミド(dimethylformamide、DMF)、ジメチルアセトアミド(dimethylacetamide、DMA)、ジメチルスルホキシド(dimethylsulfoxide、DMSO)及びこれらの組み合わせからなる群から選択されるいずれか一つである、請求項14に記載の高分子電解質膜の製造方法。
- 互いに対向して位置するアノード電極及びカソード電極と、
前記アノード電極とカソード電極との間に位置する高分子電解質膜とを含み、
前記高分子電解質膜は、イオン伝導性を有する、シートまたはフィルム状に形成されたか、または多孔性支持体中に充填された炭化水素系イオン伝導体層、及び前記炭化水素系イオン伝導体層の表面に非連続状に分散された、電極層に直接、接合するためのイオン伝導性を有するフッ素系イオン伝導体を含み、前記フッ素系イオン伝導体は、前記炭化水素系イオン伝導体層の表面に溶解接合されている、膜−電極アセンブリ。 - 前記アノード電極またはカソード電極はフッ素系バインダーを含む、請求項17に記載の膜−電極アセンブリ。
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