JP6830950B2 - 電気二重層キャパシタおよびその製造方法 - Google Patents
電気二重層キャパシタおよびその製造方法 Download PDFInfo
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- H01G11/22—Electrodes
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Description
第1に、電極と電解質との間の境界で形成される電気二重層による。この電気二重層の容量は次式(1)で決まる。
電気二重層キャパシタの次の構造が知られている[非特許文献12参照]。この構造では電極が、基本的なキャパシタにおいて膜の機能を果たすものであり、カーボンナノチューブ(CNT)で作られている。典型例の作動電極は、電気アーク法により合成された粉末状のナノチューブを、穴のないグラファイトの基板上に均一に塗布することによって形成されている。濃度35重量%の硫酸(密度1.26g/cm3)が電解液に使用された。CNTの特性を向上させる目的で、電解液を電位1.1Vに保って分極させることにより親水化させている。典型例は、仕事電位の範囲の広さ(1.4V以上)、約20kW/kgの比出力、および1Wh/kg以下の比エネルギーに特徴がある。典型例の主な欠点は、先に説明された装置と同様、電気二重層キャパシタの充電に外部電源が必要なことである。
図2の(a、b)には、研究された電気二重層キャパシタのセル模型の構造と外観とが示されている。このセルはフッ素樹脂製のハウジング3とステンレス鋼製の蓋2とから成る。ハウジングの内部には電極、コレクタ4が設置されており、フッ素樹脂製のワッシャー5によって蓋から絶縁されている。研究中の作動電極8は基板の形をしており、コーティング面をゴム環6に向け、それにフッ素樹脂製の中敷き7で押し付けられている。この基板の下側には、ねじの切られたバネ端子で端子付きの電線がつながれている。セルは、電極4の貫通穴を通して注入された電解液で満たされている。この実施形態の寸法では、基板の見かけの面積は0.5cm2であり、電解液が抜かれて乾燥したセルの静電容量は82pFである。
厚さ約10μmのCNT配列の形をした被覆が片側に形成された基板に塩酸アニリンの溶液が含浸された。これにより、炭素原子の約半分が同位体C−14であった。乾燥された後での基板の質量の増分から決定されたC−14の放射能の総量は、第1基板では1.74mCi、第2基板では6.0mCiであった。基板は上記の構造のセルの中に置かれた。このセルの電圧が、同位体C−14のβ崩壊による電荷として記録された。乾燥したセルの充電特性は、図3に示されている。
放射能が1.74mCiに等しいC−14を含む基板を有するセルには、乾燥状態での充放電が実験された後、蒸留水が充填された。このセルの充放電特性が測定された。このセルの電圧と負荷抵抗10kΩへの放電電流との変化が、図5に示されている。
例1に記載されたように、放射能6mCiのC−14を含む塩酸アニリンが含浸されたCNT配列を備えた基板を有するセルは、蒸留水を充填された状態で充放電の実験が行われた後に乾燥させられ、その後、そのセルには電解液0.1NのH2SO4が充填された。
放射能が6mCiに等しいC−14を含む塩酸アニリンが含浸されたCNT配列を有する基板を備えたセルは、例2に記載されたように、電解液0.1NのH2SO4が充填されて充放電実験が行われた後、乾燥されてから電解液0.01NのNaOHで満たされた。
特徴1:β崩壊による放射線のエネルギーを電気エネルギーに変換するこの装置では電気二重層キャパシタが使用される。その作動電極は、カーボンナノチューブの配列を有する基板として形成されている。
Claims (8)
- 密閉された保護用のハウジングと、
前記ハウジングの中に置かれた互いに電気的に絶縁された電極対であって、片方または両方が前記ハウジングからも電気的に絶縁されており、同位体C−14を含む、カーボンナノチューブ(CNT)、フラーレン、グラフェン、煤、グラファイト、またはそれらの混合物の配列の形態である第1(作用)電極と第2(補助)電極と、
セルの自由空間と前記電極対の隙間とを満たしている電解液と
を備え、
炭素(同位体C−14を含む。)含有物質が前記第1電極の表面に塗布されていることを特徴とする電気二重層キャパシタ。 - 前記第1電極の表面に塗布された炭素含有物質が、同位体C−14を含む、カーボンナノチューブ(CNT)、フラーレン、グラフェン、煤、グラファイト、またはそれらの混合物の配列の形態であることを特徴とする請求項1に記載の電気二重層キャパシタ。
- セパレータが前記電極対の間に配置されて、対向する電極同士の機械的接触を防ぎ、陰極と陽極との間での電解質の混合を妨害することを特徴とする請求項1に記載の電気二重層キャパシタ。
- 前記電極対は、耐食性及び導電性を備えることを特徴とする請求項1に記載の電気二重層キャパシタ。
- 放射性核種H−3、Ni−63、Sr−90、Kr−85、Am−241、Ac−227、Th−229がCNTの表面に置かれていることを特徴とする請求項1に記載の電気二重層キャパシタ。
- 酸性溶液H 2 SO 4 もしくはHNO 3 、アルカリ性溶液NaOHもしくはKOH、又は、塩の溶液KCl、NaCl、KNO 3 、Na 2 SO 4 が電解液として使用されていることを特徴とする請求項1に記載の電気二重層キャパシタ。
- 電気二重層キャパシタを製造する方法であって、
炭素含有物質の表層を第1電極に塗布する工程を含む第1電極と第2電極とを準備するステップと、
前記第1電極と第2電極とを密封されたハウジングの中に設置して、前記第1電極と第2電極とを互いに電気的に絶縁するステップと、
前記ハウジングを電解質で満たすステップと
を備え、
前記炭素含有物質の層に同位体C−14が導入されている
ことを特徴とする製造方法。 - 同位体C−14を含む塩酸アニリンのアルコール溶液が、前記第1電極の表面上の炭素含有物質の配列へ化合物を含浸するのに使用されることを特徴とする請求項7に記載の電気二重層キャパシタの製造方法。
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