JP2007115749A - 電気二重層キャパシタ電極用炭素材の製造方法 - Google Patents
電気二重層キャパシタ電極用炭素材の製造方法 Download PDFInfo
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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
- 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
- Y02E60/13—Energy storage using capacitors
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- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
【解決手段】生コークスを600〜900℃の温度範囲で一段目の焼成を行った後、一旦100℃以下に降温し、前記一段目の焼成温度より100℃以上高い温度で、かつ、1200℃までの範囲で二段目の焼成を行い、得られた炭化品を賦活処理することを特徴とする。
【選択図】図1
Description
揮発分8.1質量%の生コークスを表1に示す条件にて焼成した。その際、昇温速度は、200℃/時間とした。焼成後の炭化品について、以下の方法により、揮発分(VM)、真密度(RD)、水素量(H/C)、平均層間距離(d002)、結晶子(c軸)の大きさ(Lc002)、マクロポア、メソポア及びミクロポアの各細孔容積を測定した。各測定方法は以下の通りである。
上記の炭化品100質量部に対して水酸化カリウムが200重量部となるように混合し、窒素ガス雰囲気中、750℃で1時間賦活反応を進行せしめ、反応後に水洗及び酸洗浄(HClを使用)を繰り返し、炭素材中に残存する金属カリウムを除去し、乾燥して賦活品(EDLC電極用炭素材)を得た。得られた賦活品について、前記同様に各細孔容積を求め、また、比表面積、残留K濃度についても評価した。
平均粒径20μmに粉砕した上記賦活品80質量部にカーボンブラックを10質量部、ポリテトラフルオロエチレン粉末を10質量部加え、乳鉢でペースト状となるまで混錬した。次いで、得られたペーストを180kPaのローラープレスで圧延して、厚さ200μmの電極シートを作製した。
上記電極シートから直径16mmの円盤状ディスクを2枚打ち抜き、120℃、13.3Pa(0.1Torr)で2時間真空乾燥した後、露点−85℃の窒素雰囲気下のグローブボックス中にて、有機電解液(トリエチルメチルアンモニウムテトラフルオロボレートのプロピレンカーボネート溶液、濃度:1モル/リットル)を真空含浸せしめた。次に、2枚の電極を各々正極、負極とし、両極間にセルロース系セパレータ(ニッポン高度紙工業社製、商品名:TF40−50、厚さ:50μm)、両端にはアルミ箔の集電体を取り付け、宝泉社製の2極式セルに組み込んで電気二重層キャパシタ(コイン型セル)を作製した。得られた各キャパシタについて、以下の方法により、エネルギー密度、静電容量を測定した。結果を表1に併せて示す。
静電容量C[F]=IΔT/(V1−V2)
に従って静電容量C[F]を算出し、これを電極に含まれる活性炭の質量(正極、負極の合計)で割ると、質量あたり静電容量[F/g]が算出される。このF/gに、電極密度[g/cc]を掛けてF/ccを算出した。
Claims (7)
- 生コークスを600〜900℃の温度範囲で一段目の焼成を行った後、一旦100℃以下に降温し、前記一段目の焼成温度より100℃以上高い温度で、かつ、1200℃までの範囲で二段目の焼成を行い、得られた炭化品を賦活処理することを特徴とする電気二重層キャパシタ電極用炭素材の製造方法。
- 前記賦活処理は、アルカリ金属水酸化物を用いたアルカリ賦活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電極用炭素材の製造方法。
- 前記アルカリ金属水酸化物は、水酸化カリウムであることを特徴とする請求項2に記載の電気二重層キャパシタ電極用炭素材の製造方法。
- 賦活処理後の活性炭の比表面積が、100〜1200m2/gであることを特徴とする請求項1〜3のいずれか1項に記載の電気二重層キャパシタ電極用炭素材の製造方法。
- 賦活処理後の活性炭の窒素ガス吸着法による細孔直径が0.1〜50nmの細孔容積が0.1〜1ml/g、水銀圧入法による細孔直径が0.05〜300μmの細孔容積が0.4〜2ml/gである電気二重層キャパシタ電極用炭素材。
- 賦活処理後の活性炭のアルカリ金属量が200質量ppm以下である請求項5記載の電気二重層キャパシタ電極用炭素材。
- 賦活処理前の炭化物の比表面積が、1〜20m2/gであり、窒素ガス吸着法による細孔直径が0.1〜50nmの細孔容積が0.02〜0.2ml/g、水銀圧入法による細孔直径が0.05〜300μmの細孔容積が0.4〜2ml/gである電気二重層キャパシタ電極用炭素材。
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Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009005170A1 (ja) * | 2007-07-04 | 2009-01-08 | Nippon Oil Corporation | 電気二重層キャパシタ電極用活性炭の製造方法 |
JP2009013012A (ja) * | 2007-07-04 | 2009-01-22 | Nippon Oil Corp | 電気二重層キャパシタ電極用活性炭の製造方法 |
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