JP2015005722A - 電極、その電極を用いた電気二重層キャパシタ、及び電極の製造方法 - Google Patents
電極、その電極を用いた電気二重層キャパシタ、及び電極の製造方法 Download PDFInfo
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- JP2015005722A JP2015005722A JP2014031101A JP2014031101A JP2015005722A JP 2015005722 A JP2015005722 A JP 2015005722A JP 2014031101 A JP2014031101 A JP 2014031101A JP 2014031101 A JP2014031101 A JP 2014031101A JP 2015005722 A JP2015005722 A JP 2015005722A
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Abstract
【解決手段】平均粒子径が100nm以上且つ10μm未満の炭素粉末と繊維状炭素とを溶媒中に分散させる分散工程、炭素粉末と繊維状炭素とを分散させた溶液の噴射流同士を衝突させる処理、または前記溶液に対してずり応力と遠心力を加える処理で溶媒中に分散させる分散工程とを備える。その後、分散工程を経た溶液を濾過することで炭素粉末/繊維状炭素シートを得るシート形成工程とを備える。
【選択図】図1
Description
(1)平均粒子径が100nm以上且つ10μm未満の多孔質化処理した炭素粉末と繊維状炭素とを溶媒中に分散させる分散工程。
(2)前記分散工程で得られた溶液の溶媒を除去することで、炭素粉末/繊維状炭素シートを得るシート電極形成工程。
(1)炭素粉末と、繊維状炭素とを溶媒中に分散させる分散工程。
(2)前記分散工程で得られた溶液の溶媒を除去することで、炭素粉末/繊維状炭素シート電極を得るシート電極形成工程。
以下では、(1)(2)の工程について詳述する。
分散工程では、炭素粉末と繊維状炭素とを溶媒中に分散させる。
分散工程において平均粒子径が100nm以上且つ10μm未満の多孔質化処理した炭素粉末と、繊維状炭素とを分散させた場合、シート電極形成工程では、混合溶液の溶媒を除去することで、炭素粉末/繊維状炭素シート電極を得た。混合溶液の溶媒を除去する方法としては、混合溶液を抄紙成型を含む濾過する方法などを利用することができる。
本発明に係る電極は、その電極密度を0.71g/cc以上とすることにより、電極容量において良好な結果が得られる。
本発明に係る電極及び電極の製造方法は、電気二重層キャパシタに限らず、リチウムイオンキャパシタなどの電気化学キャパシタなど、各種キャパシタや二次電池などの蓄電デバイスに適用することができる。
また、本発明に係る電極及び電極の製造方法は、コイン型の電気二重層キャパシタに限らず、ラミネートフィルムを用いて熱封止したラミネート型に適用してもよく、また、正極電極及び負極電極の間にセパレータを介して巻回した円筒型素子や正極電極及び負極電極の間にセパレータを介して積層した積層型素子を使用した各種キャパシタや二次電池などの蓄電デバイスにも適用できる。
本特性比較では、平均粒子径100nm超の炭素粉末として平均粒子径が1μmの炭素粉末のシート電極を用いた電気二重層キャパシタの特性を確認する。本実施例及び比較例では、以下の条件により電極を作成し、当該電極を用いて電気二重層キャパシタを作成して各種特性を測定した。本特性比較で使用する実施例1−1〜1−3、及び、比較例1は、次の方法により作製した。
まず、水蒸気賦活処理した平均粒子径1μmの活性炭(原料:やしがら)を電極内の炭素粉末と繊維状炭素との合計量に対して80wt%となるように計り取る。次に、外径20nm、長さ150μmの繊維状炭素としてCNTを、電極内の活性炭とCNTとの合計量に対して20wt%となるように計り取る。活性炭とCNTとは、合計50mgとなるようにする。合計50mgの活性炭とCNTを、50mlのメタノールと混合させて混合溶液
を作製した。
実施例1−1では、上記の混合溶液に対して、遠心力200000N(kgms−2)で5分間、超遠心処理による分散処理を行い、活性炭/CNT/メタノール分散液を作製した。この分散液をPTFE濾紙(直径:35mm、平均細孔0.2μm)を用いて減圧濾過し、抄紙成型した活性炭/CNTシート電極を得た。これをアルミニウム板の上に載せ、別のアルミニウム板で挟み、板の上下方向から10tcm−2の圧力で1分間プレスし、活性炭/CNTシート電極を得た。この活性炭/CNTシート電極をアルミニウム板から剥離し、集電体と同じサイズに切り分け、集電体となるステンレス鋼板の上に導電性接着剤により貼り付け、常圧下120℃にて1時間乾燥し、2枚の電極体を得、セルロース系セパレータを介して電気二重層キャパシタ素子を作製した(電極面積:2.1cm2)。そして、1M(=1mol/dm3)の四フッ化ホウ酸テトラエチルアンモニウムを含むプロピレンカーボネート溶液を電解液として素子に含浸した後、ラミネートフィルムを用いて熱封止し、評価用セル(電気二重層キャパシタ)を作製した。
実施例1−2では、上記混合溶液に対して、ジェットミキシングにて200MPa,3Pass,0.5g/lの圧力及び濃度で分散処理を行い、炭素粉末/繊維状炭素/メタノール分散液を作製した以外は実施例1−1と同様の方法で評価用セルを作製した。
実施例1−2では、上記混合溶液に対して、ボールミルにて300秒分散処理を行い、炭素粉末/繊維状炭素/メタノール分散液を作製した以外は実施例1−1と同様の方法で評価用セルを作製した。
比較例1では、上記混合溶液に対して、ミキサーで約30秒間撹拌させて分散処理を行い、炭素粉末/繊維状炭素/メタノール分散液を作製した以外は実施例1−1と同様の方法で評価用セルを作製した。
2 …電解質
3 …電極
4 …セパレータ
5 …電極
6 …正極ケース
7 …ガスケット
Claims (6)
- 平均粒子径が100nm以上且つ10μm未満の多孔質化処理した炭素粉末と、繊維状炭素とを、溶液の噴射流同士を衝突させる処理、または前記溶液に対してずり応力と遠心力を加える処理で分散させた溶液から溶媒を除去して得られたことを特徴とする電極。
- 前記溶媒は、前記溶液を濾過して除去されたことを特徴とする請求項1に記載の電極。
- 炭素粉末と繊維状炭素とが高分散され、その電極密度が0.71g/cc以上であることを特徴とする請求項1または請求項2に記載の電極。
- 請求項1乃至3のいずれかの電極を集電体の上に形成した電気二重層キャパシタ。
- 平均粒子径が100nm以上且つ10μm未満の多孔質化処理した炭素粉末と繊維状炭素とを溶媒中に分散させる分散工程と、
前記分散工程で得られた溶液の溶媒を除去して炭素粉末/繊維状炭素シートを得るシート電極形成工程と、
を備え、
前記分散工程は、前記溶液の噴射流同士を衝突させる処理、または前記溶液に対してずり応力と、遠心力を加える処理であることを特徴とする電極の製造方法。 - 前記シート電極形成工程は、前記溶液を濾過することにより溶媒を除去することを特徴とする請求項5に記載の電極の製造方法。
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JP2017139435A (ja) * | 2016-01-29 | 2017-08-10 | 日本ケミコン株式会社 | 電極、電極を用いたキャパシタ、および電極の製造方法 |
JP2019149505A (ja) * | 2018-02-28 | 2019-09-05 | 株式会社大木工藝 | 電気二重層キャパシタおよび電気二重層キャパシタの製造方法 |
JP7116468B2 (ja) | 2018-02-28 | 2022-08-10 | 株式会社大木工藝 | 電気二重層キャパシタの製造方法 |
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JP6543885B2 (ja) | 2019-07-17 |
WO2014129540A1 (ja) | 2014-08-28 |
KR102320546B1 (ko) | 2021-11-01 |
EP2960913A1 (en) | 2015-12-30 |
JP2015005721A (ja) | 2015-01-08 |
TW201447941A (zh) | 2014-12-16 |
KR20150119849A (ko) | 2015-10-26 |
JP6569526B2 (ja) | 2019-09-04 |
JPWO2014129540A1 (ja) | 2017-02-02 |
US9997301B2 (en) | 2018-06-12 |
CN104956455B (zh) | 2018-07-10 |
EP2960913A4 (en) | 2016-10-05 |
US20150357127A1 (en) | 2015-12-10 |
TWI620214B (zh) | 2018-04-01 |
CN104956455A (zh) | 2015-09-30 |
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