JP4552085B2 - ナノサイズの金属酸化物電極の製造方法 - Google Patents
ナノサイズの金属酸化物電極の製造方法 Download PDFInfo
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- 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
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Description
前記二次電池は、単位重さまたは体積当たりの蓄積可能なエネルギー量(エネルギー密度)の点からは優れているが、使用期間、充填時間、単位時間当たりの使用可能なエネルギー量(出力密度)の点からはまだ多くの改善の余地が求められている。
それに比べ、前記電気化学的キャパシタは、エネルギー密度の点からは前記二次電池に比べて小さいが、使用時間、充填時間、出力密度の点からは二次電池に比べて非常に優れた特性を示す。したがって、前記電気化学的キャパシタの場合、エネルギー密度を向上させるための研究開発が活発に行われている。
一方、米国特許第6,129,901号には、カーボンナノチューブを含む金属の製造方法が開示されている。この発明によれば、多数の気孔を有するアルミニウムテンプレートを製造するために、電解槽内でアルミナ基板を酸化処理する段階と、前記気孔内に適切な触媒(Co、Fe、Niから選ばれたいずれか一つ)を蒸着する段階と、前記気孔にカーボンナノチューブが成長するように適切な温度(600〜800℃)でヒドロカーボンガスに前記アルミナテンプレートを露出させる段階とによって、カーボンナノチューブを製作している。各カーボンナノチューブの外径は、テンプレート内の気孔直径よりも小さく製作されている。
前記ゾル−ゲル法を用いて金属酸化物素材を合成する場合、攪拌、フィルターリング、水洗、乾燥(drying)、熱処理などの複雑な多段階工程を含み、金属酸化物素材の合成にかかる時間が非常に長い。また、このようにして製造された金属酸化物粉末を電極の形態に形成するためには、一定量の導電性カーボンとバインダーを混合しなければならないから、金属酸化物自体の電気化学的な特性を正確に判断できず、電極活物質以外の導電材、バインダーの存在によって蓄電容量の減少をもたらす。
また、本発明の方法によれば、ナノサイズの金属酸化物を簡単な製造工程を通じて合成し、電極の形態に直接形成することができる。
さらに、従来のような電極活物質、バインダー、炭素導電剤を混合した後、集電体に塗布して電極を形成する過程が排除されて、直ちに電極を成形して金属酸化物自体の電気化学測定を容易に行うことができる。
前記スーパーキャパシタの電荷貯蔵原理は、金属酸化物と電解質界面における可逆的な(reversible)電気化学反応によって行われるので、高い蓄電容量を実現するためには、金属酸化物と電解質界面の面積を増加させて電気化学的活性反応面(electrochemically active reaction site)を増加させなければならない。これは、本発明に係るナノサイズの金属酸化物の製造およびそれから構成された電極を通じて実現できる。
一方、前記アルミナ鋳型のナノ気孔の直径を調節することによって、ナノサイズの金属酸化物の直径を容易に制御でき、また、前記印加電流密度と印加時間などの電気化学的な変数の調節を通じて、ナノサイズの金属酸化物の長さを容易に制御できることは勿論である。
図1と対応させると、(1)まず、20nm〜200nmの直径を有するアルミナ鋳型を準備する。(2)前記アルミナ鋳型の片面に集電体の役割を担うように、スパッタリング装置を用いて、数十μm厚さに、電気伝導度に優れ、金属酸化物の電気化学的な析出時に安定で、金属塩の溶液中で化学的、電気化学的に安定な金属をスパッタリングし、電気化学的析出のために露出面積が一定になるようにアルミナ鋳型の側面をシール(sealing)する。(3)ニッケル酸化物の電気化学的析出溶液としては、0.05M〜0.5Mのニッケル塩溶液を準備し、前記アルミナ鋳型電極を前記ニッケル塩溶液に挿入した後、数十〜数百mA/cm2の電流密度または数十〜数百mVの電極電位を数十分間印加して、前記アルミナ鋳型内のナノ気孔にニッケル酸化物を電気化学的に析出させる。(4)このようにして製造されたアルミナ鋳型/ナノサイズの金属酸化物複合体を0.1M〜5M NaOH溶液に10分〜1時間挿入して前記アルミナ鋳型を除去した後、乾燥する段階を経て最終的に20nm〜200nmの直径を有するニッケル酸化物ナノ線材電極を製造する。
Claims (5)
- 多数のナノ気孔が形成されたアルミナ鋳型を準備する段階、
前記アルミナ鋳型の片面に集電体の役割を果たす金属をスパッタリングし、アルミナ鋳型の側面をシールする段階、
前記スパッタリング段階後の鋳型を金属塩が溶解している析出溶液に挿入した後、電流または電極電位を印加する段階、
前記電流または電極電位の印加によって前記鋳型のナノ気孔内に金属酸化物を電気化学的に析出させる段階、
前記スパッタリング段階後の鋳型を金属塩が溶解している析出溶液に挿入した後、静電流を印加する段階、
前記静電流の印加によって前記鋳型のナノ気孔内に金属酸化物を電気化学的に析出させる段階、
前記アルミナ鋳型と該アルミナ鋳型のナノ気孔に析出されたナノサイズの金属酸化物複合体と前記集電体の役割を果たす金属とをNaOH溶液で処理して前記アルミナ鋳型を除去する段階、
アルミナ鋳型が除去された前記ナノサイズの金属酸化物と前記集電体の役割を果たす金属を乾燥することによって、ナノサイズの金属酸化物を有する電極を製造する段階、からなることを特徴とするナノサイズの金属酸化物電極の製造方法。 - 前記スパッタリング段階において、スパッタリングされる集電体金属は、電気伝導度に優れるとともに、金属酸化物の電気化学的な析出時に安定であり、金属塩の溶液中で化学的、電気化学的に安定な金属であることを特徴とする、請求項1に記載のナノサイズの金属酸化物電極の製造方法。
- 前記析出溶液に溶解している金属塩が、ニッケルを含有するニッケル塩であることを特徴とする請求項1に記載のナノサイズの金属酸化物電極の製造方法。
- 前記電流または電圧の印加段階が、数十〜数百mA/cm2の電流密度または数十〜数百mVの電極電位を数十分間印加してなることを特徴とする請求項1に記載のナノサイズの金属酸化物電極の製造方法。
- 前記NaOH溶液で処理する段階が、前記アルミナ鋳型と、該アルミナ鋳型のナノ気孔に析出されたナノサイズの金属酸化物複合体を0.1M〜5M NaOH溶液に10分〜1時間挿入してなることを特徴とする請求項1に記載のナノサイズの金属酸化物電極の製造方法。
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KR10-2003-0099761A KR100534845B1 (ko) | 2003-12-30 | 2003-12-30 | 나노 크기의 금속산화물 전극의 제조 방법 |
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