JP6316949B2 - カーボンナノチューブ凝集体を含むカーボンナノチューブ−硫黄複合体及びその製造方法 - Google Patents
カーボンナノチューブ凝集体を含むカーボンナノチューブ−硫黄複合体及びその製造方法 Download PDFInfo
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- JP6316949B2 JP6316949B2 JP2016524531A JP2016524531A JP6316949B2 JP 6316949 B2 JP6316949 B2 JP 6316949B2 JP 2016524531 A JP2016524531 A JP 2016524531A JP 2016524531 A JP2016524531 A JP 2016524531A JP 6316949 B2 JP6316949 B2 JP 6316949B2
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- carbon nanotube
- sulfur
- nanotube aggregate
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Classifications
-
- H—ELECTRICITY
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Description
本出願の解決しようとする課題は、以上で言及した技術的課題に制限されず、言及されていないさらに別の技術的課題は、以下の記載から当業者に明確に理解されるはずである。
前記カーボンナノチューブ凝集体のタップ密度は0.01g/cc以上1g/cc以下であるもののカーボンナノチューブ-硫黄複合体を提供する。
前記カーボンナノチューブ凝集体のタップ密度は0.01g/cc以上1g/cc以下であるもののカーボンナノチューブ-硫黄複合体の製造方法を提供する。
前記カーボンナノチューブ凝集体のタップ密度は0.01g/cc以上1g/cc以下であるもののカーボンナノチューブ-硫黄複合体の製造方法を提供する。
前記S30及びS40の段階のいずれかにおいて、前記カーボンナノチューブ凝集体の直径を50マイクロメートル以下に調節することができる。
触媒量を生成されるカーボンナノチューブの総重量対比1.25%で使用して、カーボンナノチューブを成長させた。これにより、タップ密度0.27g/ccのカーボンナノチューブ凝集体を製造した。
触媒量を生成されるカーボンナノチューブの総重量対比2.5%で使用して、カーボンナノチューブを成長させた。これにより、タップ密度0.07g/ccのカーボンナノチューブ凝集体を製造した。
触媒量を生成されるカーボンナノチューブの総重量対比5%で使用して、カーボンナノチューブを成長させた。これにより、タップ密度0.026g/ccのカーボンナノチューブ凝集体を製造した。
平均500マイクロメートルの直径を有し、比表面積(BET測定)が180m2/gであり、タップ密度が0.27g/ccであるカーボンナノチューブ凝集体100gを乾式ジェットミルを用いて平均粒径が10マイクロメートルであるカーボンナノチューブ凝集体の大きさを調節した。この際、前記カーボンナノチューブ凝集体のタップ密度は0.40g/ccであった。大きさが調節されたカーボンナノチューブ凝集体50gを1マイクロメートル乃至10マイクロメートルの直径の硫黄粉末50gと混ぜて均一に混合して、150℃のオーブンで熱処理して、カーボンナノチューブ凝集体の内部に硫黄を含浸させた。これにより、カーボンナノチューブ-硫黄複合体を製造した。
大きさが調節されたカーボンナノチューブ凝集体30g及び硫黄粉末70gを混合したことを除いては、実施例1と同様にカーボンナノチューブ-硫黄複合体を製造した。前記のように製造して、平均粒径が10マイクロメートルであるカーボンナノチューブ-硫黄複合体を得た。
大きさが調節されたカーボンナノチューブ凝集体10g及び硫黄粉末90gを混合したことを除いては、実施例1と同様にカーボンナノチューブ-硫黄複合体を製造した。前記のように製造して、平均粒径が10マイクロメートルであるカーボンナノチューブ-硫黄複合体を得た。
硫黄及び導電材としてスーパー-P(Super-P)を重量比で9:1で混合した後、1hr/500rpmの条件でボールミルを行い、複合体を製造して、平均粒径が10マイクロメートルである複合体を得た。
陽極活物質で前記製造例2で製造されたカーボンナノチューブ-硫黄複合体を使用し、導電材でデンカブラック(商標)を使用し、バインダーでSBR(Styrene Butadiene Rubber)とCMC(carboxymethyl cellulose)を添加して陽極スラリーを製造した。このとき、含量比は複合体:導電材:バインダーは、75:20:5の重量%で混合して陽極スラリーを製造し、電極内の硫黄含有量が3mAh/cm2となるようにスラリーをコーティングして陽極を製造した。
実施例1で使用したカーボンナノチューブ-硫黄複合体を製造例3で製造されたカーボンナノチューブ-硫黄複合体で使用したことを除いては、同一に行い、リチウム硫黄電池を製造した。
実施例1で使用したカーボンナノチューブ-硫黄複合体を比較製造例1で製造されたスーパー-P硫黄複合体で使用したことを除いては、実施例1と同一に行い、リチウム硫黄電池を製造した。
前記実施例1、実施例2及び比較例1で製造された電池の初期充/放電容量を測定した。充電と放電c-rateは、0.1cで常温で進行し、図8にその測定値を示した。電極内の硫黄含有量を3mAh/cm2に調節して放電容量を比較した。
Claims (18)
- カーボンナノチューブ凝集体;及び
前記カーボンナノチューブ凝集体の外部表面及び内部に位置する硫黄を含み、
前記カーボンナノチューブ凝集体のタップ密度は0.01g/cc以上1g/cc以下であり、
前記カーボンナノチューブ凝集体内に空隙が維持されているカーボンナノチューブ凝集体−硫黄複合体。 - 前記カーボンナノチューブ凝集体は、凝集体の総体積を基準で、10%以上70%以下の空隙度を含むことを特徴とする請求項1に記載のカーボンナノチューブ凝集体−硫黄複合体。
- 前記硫黄は、前記カーボンナノチューブ凝集体の外部全体表面の100%未満の領域に位置することを特徴とする請求項1または2に記載のカーボンナノチューブ凝集体−硫黄複合体。
- 前記カーボンナノチューブ凝集体−硫黄複合体でカーボンナノチューブ凝集体と硫黄の含量比は、重量%基準で、10〜50:50〜90であることを特徴とする請求項1〜3のいずれか一項に記載のカーボンナノチューブ凝集体−硫黄複合体。
- 前記カーボンナノチューブ凝集体の直径は500マイクロメートル以下であることを特徴とする請求項1〜4のいずれか一項に記載のカーボンナノチューブ凝集体−硫黄複合体。
- 請求項1乃至請求項5のいずれか一項に記載のカーボンナノチューブ凝集体−硫黄複合体を含むリチウム−硫黄電池用陽極。
- 前記陽極は、導電材及びバインダーの少なくとも一つをさらに含むことを特徴とする請求項6に記載のリチウム−硫黄電池用陽極。
- 請求項1乃至請求項5のいずれか一項に記載のカーボンナノチューブ凝集体−硫黄複合体を含むリチウム−硫黄電池用陽極;陰極;及び前記陽極と陰極との間に位置する分離膜を含むリチウム−硫黄電池。
- 請求項8に記載のリチウム−硫黄電池を単位電池で含む電池モジュール。
- カーボンナノチューブ凝集体の外部表面及び内部に硫黄を含浸させる段階を含み、
前記カーボンナノチューブ凝集体のタップ密度は0.01g/cc以上1g/cc以下であり、
前記カーボンナノチューブ凝集体内に空隙が維持されており、
前記硫黄を含浸させる段階は、
カーボンナノチューブ凝集体と硫黄の粉末を混合した後、前記混合物を加熱して溶融された硫黄をカーボンナノチューブ凝集体に含浸させて行う
カーボンナノチューブ凝集体−硫黄複合体の製造方法。 - 前記硫黄は、前記カーボンナノチューブ凝集体の外部全体表面の100%未満の領域に位置することを特徴とする請求項10に記載のカーボンナノチューブ凝集体−硫黄複合体の製造方法。
- 前記硫黄を含浸させる段階の以前、以後、又は前後にカーボンナノチューブ凝集体の直径を50マイクロメートル以下にサイズを調節する段階をさらに含む請求項10または11に記載のカーボンナノチューブ凝集体−硫黄複合体の製造方法。
- 前記サイズを調節する段階でカーボンナノチューブ凝集体の直径は、1マイクロメートル以上10マイクロメートル以下に調節することを特徴とする請求項12に記載のカーボンナノチューブ凝集体−硫黄複合体の製造方法。
- 前記サイズを調節する段階は、乾式ボールミル方法、乾式ジェットミル方法又は乾式ダイノミル方法を使用して行うことを特徴とする請求項12または13に記載のカーボンナノチューブ凝集体−硫黄複合体の製造方法。
- 前記サイズを調節する段階の以後に、前記カーボンナノチューブ凝集体は、凝集体の総体積を基準で、10%以上70%以下の空隙度を含むことを特徴とする請求項12〜14のいずれか一項に記載のカーボンナノチューブ凝集体−硫黄複合体の製造方法。
- 前記カーボンナノチューブ凝集体と硫黄の含量比は、重量%基準で、10〜50:50〜90であることを特徴とする請求項10〜15のいずれか一項に記載のカーボンナノチューブ凝集体−硫黄複合体の製造方法。
- 前記加熱温度は、115℃以上180℃以下であることを特徴とする請求項10〜16のいずれか一項に記載のカーボンナノチューブ凝集体−硫黄複合体の製造方法。
- 前記硫黄を含浸させる段階の以前にカーボンナノチューブ凝集体を準備する段階(S01)をさらに含み、
前記カーボンナノチューブ凝集体を準備する段階(S01)は、カーボンナノチューブを製造する段階を含み、前記カーボンナノチューブを製造する段階で触媒量は、生成されるカーボンナノチューブの総重量に対して0.1%乃至10%であることを特徴とする請求項10〜17のいずれか一項に記載のカーボンナノチューブ凝集体−硫黄複合体の製造方法。
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