JP7176110B2 - 熱膨張された還元グラフェンオキシド、この製造方法、これを含む硫黄-炭素複合体及びリチウム二次電池 - Google Patents
熱膨張された還元グラフェンオキシド、この製造方法、これを含む硫黄-炭素複合体及びリチウム二次電池 Download PDFInfo
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Description
本発明は、表面に気孔を含む熱膨張された還元グラフェンオキシドであって、
前記表面気孔の平均サイズは0.5ないし4nmである熱膨張された還元グラフェンオキシドを提供する。
(b)前記熱膨張されたグラフェンオキシドを熱処理して還元させる段階;及び
(c)前記熱膨張された還元グラフェンオキシドを蒸気活性化させて表面に気孔を形成する段階;を含む熱膨張された還元グラフェンオキシドの製造方法を提供する。
前記表面に気孔を含む熱膨張された還元グラフェンオキシドの表面気孔、内部気孔及び表面の中で少なくとも一部に硫黄;を含む硫黄-炭素複合体を提供する。
前記正極は前記本発明の硫黄-炭素複合体を含むリチウム二次電池を提供する。
本発明は、表面に気孔を含む熱膨張された還元グラフェンオキシドであって、前記表面気孔の平均サイズは0.5ないし4nmである熱膨張された還元グラフェンオキシド(holey Thermally expanded-reduced graphene oxide、holey TE-rGO)に関する。
また、本発明は、表面に気孔を含む熱膨張された還元グラフェンオキシド(holey Thermally expanded-reduced graphene oxide、holey TE-rGO)の製造方法に係り、
(a)グラフェンオキシドを熱処理して熱膨張させる段階;
(b)前記熱膨張されたグラフェンオキシドを熱処理して還元させる段階;及び
(c)前記熱膨張された還元グラフェンオキシドを蒸気活性化させて表面に気孔を形成する段階;を含む。
本発明は表面に気孔を含む熱膨張された還元グラフェンオキシド;及び前記表面に気孔を含む熱膨張された還元グラフェンオキシドの表面気孔、内部気孔及び表面のうち、少なくとも一部に硫黄;を含む硫黄-炭素複合体に関する。
本発明は、正極;負極;前記正極と負極の間に介在される分離膜;及び電解液を含むリチウム二次電池であって、
前記正極は前記本発明の硫黄-炭素複合体を正極活物質で含む。
グラフェンオキシド(graphene oxide、GO、製品名SE2430、sixth element社)を非活性雰囲気で400℃の温度で10分間熱処理して熱膨張されたグラフェンオキシドを製造した。
300℃の温度で20分間蒸気活性化したことを除いては、前記実施例1と同様に実施して捻れたペーパー構造を有し、表面に気孔を含む熱膨張された還元グラフェンオキシド(holey Thermally expanded-reduced graphene oxide、holey TE-rGO)を製造した。
グラフェンオキシド(graphene oxide、GO、製品名SE2430、sixth element社)を非活性雰囲気で400℃の温度で10分間熱処理して熱膨張されたグラフェンオキシドを製造した。
前記実施例1ないし2で製造したholey TE-rGO及び前記比較例1で製造したTE-rGOの表面に形成された気孔の容積を測定した。表面に形成された気孔の容積は気孔分布測定機(Porosimetry analyzer;Bell Japan Inc、Belsorp-II mini)を使って流通式窒素ガス吸着法によってBET(Brunauer-Emmett-Teller;BET)6点法で測定し、結果を下記図2に示す。
前記実施例1ないし2で製造したholey TE-rGO及び前記比較例1で製造したTE-rGOの比表面積、気孔容積及び気孔の平均サイズを気孔分布測定機(Porosimetry analyzer;Bell Japan Inc、Belsorp-II mini)を使って流通式窒素ガス吸着法によってBET(Brunauer-Emmett-Teller;BET)6点法で測定し、結果を下記表1に示す。
実施例3。
前記実施例1で製造したholey TE-rGO及び硫黄を3:7の重量比で混合した後、155℃の温度で35分間反応させてholey TE-rGOの内部気孔、表面気孔及び表面に硫黄が担持された硫黄-炭素複合体を製造した。
前記実施例1のholey TE-rGOの代りに比較例1のTE-rGOを使用したことを除いては、前記実施例3と同様に実施して比較例2のリチウム-硫黄電池を製造した。
3-1。初期放電容量測定
前記実施例3及び比較例2で製造したリチウム-硫黄電池に対して、充・放電測定装置を使用して充・放電特性の変化を試験した。得られた電池は、0.1C/0.1C充電/放電条件で初期容量を調べ、その結果を図4に示す。
前記実施例3及び比較例2で製造したリチウム-硫黄電池に対し、充・放電測定装置を利用して初期3cycleの間、0.1C/0.1C充電/放電、その後3cycleの間、0.2C/0.2C充電/放電して、以後0.3C/0.5Cで充電/放電して50cycleの充・放電を繰り返して寿命特性を測定し、その結果を図5に示す。
Claims (14)
- 表面気孔及び内部気孔を含む熱膨張された還元グラフェンオキシドであって、
前記表面気孔及び内部気孔の平均サイズは0.5ないし4nmであり、
前記熱膨張された還元グラフェンオキシドの気孔容積は7ないし12cm 3 /gであることを特徴とする熱膨張された還元グラフェンオキシド。 - 前記熱膨張された還元グラフェンオキシドの比表面積は500ないし2500m2/gであることを特徴とする請求項1に記載の熱膨張された還元グラフェンオキシド。
- 前記熱膨張された還元グラフェンオキシドは捻れた(crumpled)ペーパー構造を有することを特徴とする請求項1または2に記載の熱膨張された還元グラフェンオキシド。
- (a)グラフェンオキシドを熱処理して熱膨張させる段階、
(b)前記熱膨張されたグラフェンオキシドを熱処理して還元させる段階、及び
(c)前記熱膨張された還元グラフェンオキシドを蒸気活性化させて表面に気孔を形成する段階、を含み、
前記熱膨張された還元グラフェンオキシドの気孔容積は7ないし12cm 3 /gであることを特徴とする熱膨張された還元グラフェンオキシドの製造方法。 - 前記(a)段階のグラフェンオキシドはパウダー形態であることを特徴とする請求項4に記載の熱膨張された還元グラフェンオキシドの製造方法。
- 前記(a)段階の熱処理は300ないし500℃の温度で5ないし30分間行われることを特徴とする請求項4または5に記載の熱膨張された還元グラフェンオキシドの製造方法。
- 前記(b)段階の熱処理は700ないし1200℃の温度で1ないし5時間行われることを特徴とする請求項4から6のいずれか一項に記載の熱膨張された還元グラフェンオキシドの製造方法。
- 前記(c)段階の蒸気活性化は500ないし1000℃の温度で30分ないし3時間行われることを特徴とする請求項4から7のいずれか一項に記載の熱膨張された還元グラフェンオキシドの製造方法。
- 前記熱膨張された還元グラフェンオキシドの表面気孔及び内部気孔の平均サイズは0.5ないし4nmであることを特徴とする請求項4から8のいずれか一項に記載の熱膨張された還元グラフェンオキシドの製造方法。
- 前記熱膨張された還元グラフェンオキシドの比表面積は500ないし2500m2/gであることを特徴とする請求項4から9のいずれか一項に記載の熱膨張された還元グラフェンオキシドの製造方法。
- 請求項1から3のいずれか一項に記載の熱膨張された還元グラフェンオキシド、及び
前記熱膨張された還元グラフェンオキシドの表面気孔、内部気孔及び表面のうち、少なくとも一部に硫黄、を含む硫黄-炭素複合体。 - 正極、負極、前記正極と前記負極の間に介在される分離膜、及び電解液を含むリチウム二次電池であって、
前記正極は請求項11に記載の硫黄-炭素複合体を含むリチウム二次電池。 - 正極の硫黄ローディング量は2ないし15mg/cm2であることを特徴とする請求項12に記載のリチウム二次電池。
- 前記リチウム二次電池はリチウム-硫黄電池であることを特徴とする請求項12に記載のリチウム二次電池。
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- 2019-11-08 JP JP2021522054A patent/JP7176110B2/ja active Active
- 2019-11-08 WO PCT/KR2019/015142 patent/WO2020101276A1/ko unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2013214503A (ja) | 2012-03-09 | 2013-10-17 | Toray Ind Inc | カーボン硫黄複合体およびそれを用いた電気化学素子ならびにリチウムイオン電池 |
WO2017217408A1 (ja) | 2016-06-13 | 2017-12-21 | 日本電気株式会社 | リチウムイオン二次電池 |
Non-Patent Citations (1)
Title |
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L. ZHOU et al.,Facile synthesis of holey graphene-supported Pt catalysts for direct methanol electro-oxidation,Microporous and Mesoporous Materials,2017年,Vol.247,p.116-123 |
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JP2022505642A (ja) | 2022-01-14 |
WO2020101276A1 (ko) | 2020-05-22 |
US20220002158A1 (en) | 2022-01-06 |
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