JP2021509392A - セリア‐炭素‐硫黄複合体、この製造方法、これを含む正極及びリチウム‐硫黄電池 - Google Patents
セリア‐炭素‐硫黄複合体、この製造方法、これを含む正極及びリチウム‐硫黄電池 Download PDFInfo
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- JP2021509392A JP2021509392A JP2020536665A JP2020536665A JP2021509392A JP 2021509392 A JP2021509392 A JP 2021509392A JP 2020536665 A JP2020536665 A JP 2020536665A JP 2020536665 A JP2020536665 A JP 2020536665A JP 2021509392 A JP2021509392 A JP 2021509392A
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- ceria
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- lithium
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Abstract
Description
本発明は、セリア(CeO2)粒子が表面に組み合わせられた円柱型炭素材が互いに絡まって3次元で相互連結されているセリア‐炭素(CeO2‐C)複合体;及び
前記セリア‐炭素複合体の外部表面及び内部の中の少なくとも一部に取り入れられた硫黄;を含むセリア‐炭素‐硫黄(CeO2‐C‐S)複合体を提供する。
(b)前記分散液を噴霧乾燥して鋳型粒子‐炭素複合体を製造する段階;
(c)前記鋳型粒子‐炭素複合体を熱処理して階層型気孔構造の炭素凝集体を製造する段階;
(d)前記炭素凝集体及びセリウム前駆体の混合液を製造する段階;
(e)前記混合液を加熱した後、酸を添加して水熱反応によってセリア‐炭素(CeO2‐C)複合体を製造する段階;及び
(f)前記セリア‐炭素複合体に硫黄を含浸させてセリア‐炭素‐硫黄複合体を製造する段階;を含むセリア‐炭素‐硫黄(CeO2‐C‐S)複合体の製造方法を提供する。
セリア‐炭素‐硫黄(CeO2‐C‐S)複合体
本発明は、セリア(CeO2)粒子が表面に組み合わせられた円柱型炭素材が互いに絡まって3次元で相互連結されているセリア‐炭素(CeO2‐C)複合体;及び前記セリア‐炭素複合体の外部表面及び内部の中の少なくとも一部に取り入れられた硫黄;を含むセリア‐炭素‐硫黄(CeO2‐C‐S)複合体に関する。
本発明のセリア‐炭素‐硫黄複合体の製造方法は、
(a)鋳型粒子及び円柱型炭素材が混合された分散液を製造する段階;
(b)前記分散液を噴霧乾燥して鋳型粒子‐炭素複合体を製造する段階;
(c)前記鋳型粒子‐炭素複合体を熱処理して階層型気孔構造の炭素凝集体を製造する段階;
(d)前記炭素凝集体及びセリウム前駆体の混合液を製造する段階;
(e)前記混合液を加熱した後、酸を添加して水熱反応によってセリア‐炭素(CeO2‐C)複合体を製造する段階;及び
(f)前記セリア‐炭素複合体に硫黄を含浸させてセリア‐炭素‐硫黄複合体を製造する段階;を含む。
硫黄の含浸は本発明で特に限定せず、公知の方法が利用されてもよい。
また、本発明は上述した本発明のセリア‐炭素‐硫黄複合体を含むリチウム‐硫黄電池用正極に関する。
また、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‐硫黄電池で、前記正極は上述した本発明の正極であるリチウム‐硫黄電池に関する。
負極は、負極集電体上に負極活物質が積層された形態を有する。必要な場合、前記負極集電体は省略可能である。
正極と負極の間には通常の分離膜が介在されてもよい。前記分離膜は電極を物理的に分離する機能を有する物理的な分離膜であって、通常の分離膜で使用されるものであれば特に制限せずに使用可能であり、特に電解液のイオン移動に対して低抵抗でありながら電解液の含湿能力に優れるものが好ましい。
前記リチウム‐硫黄電池の電解液は、リチウム塩含有電解液で水系または非水系電解液であってもよく、好ましくは有機溶媒電解液とリチウム塩からなる非水系電解質である。この他に有機固体電解質または無機固体電解質などが含まれてもよいが、これらのみに限定されることではない。
実施例1.
多重壁炭素ナノチュ‐ブ(MWCNT、diameter:10〜20nm)の水系分散液とポリスチレン(PS、diameter:500〜600nm)コロイド(colloid)溶液をMWCNT:PS=1g:3.5gの割合で混合して水系分散液を製造した。
セリア(CeO2)ナノ粒子(直径25nm)、多重壁炭素ナノチュ‐ブ(MWCNT、diameter:10〜20nm)の水系分散液とポリスチレン(PS、diameter:500〜600nm)コロイド(colloid)溶液をCeO2+MWCNT:PS=1g:3.5gの割合で混合して水系分散液を製造した。
実施例2.
前記実施例1で製造されたセリア‐炭素‐硫黄複合体、導電材及びバインダ‐を8:1:1の重量比で混合した混合物を蒸溜水に溶解して正極活物質スラリ‐を製造した後、20μm厚さのアルミニウムホイルの集電体にコ‐ティングして正極を製造した。
前記比較例1で製造されたセリア‐炭素‐硫黄複合体を使用したことを除いては、前記実施例2と同様に行ってリチウム‐硫黄電池を製造した。
前記実施例2及び比較例2で製造したリチウム‐硫黄電池の電気化学的特性を特定した。
充放電電圧の範囲は1.5〜2.8V、放電Cレ‐ト1C、充電Cレ‐ト1Cで容量特性とク‐ロン効率を測定し、その結果を下記表1及び図9に示す。
Claims (19)
- セリア(CeO2)粒子が表面に組み合わせられた円柱型炭素材が互いに絡まって3次元で相互連結されているセリア‐炭素(CeO2‐C)複合体;及び
前記セリア‐炭素複合体の外部表面及び内部の中の少なくとも一部に取り入れられた硫黄;を含むセリア‐炭素‐硫黄(CeO2‐C‐S)複合体。 - 前記セリア粒子は、セリウム前駆体を円柱型炭素材の表面で化学的成長させて形成されたことを特徴とする請求項1に記載のセリア‐炭素‐硫黄複合体。
- 前記化学的成長は、酸を添加して水熱反応によって行われることを特徴とする請求項2に記載のセリア‐炭素‐硫黄複合体。
- 前記セリア‐炭素複合体は、円柱型炭素材が整列された気孔からなる階層型気孔構造を有することを特徴とする請求項1から3のいずれか一項に記載のセリア‐炭素‐硫黄複合体。
- 前記セリア‐炭素複合体の孔隙率は10ないし60%であり、全体BET比表面積は50ないし700m2/gであることを特徴とする請求項4に記載のセリア‐炭素‐硫黄複合体。
- 前記気孔はマクロ気孔(>50nm)であることを特徴とする請求項4または5に記載のセリア‐炭素‐硫黄複合体。
- 前記マクロ気孔は300ないし800nmであることを特徴とする請求項6に記載のセリア‐炭素‐硫黄複合体。
- 前記円柱型炭素材は、炭素ナノチュ‐ブ、グラファイトナノファイバ‐、カ‐ボンナノファイバ‐及び活性炭素繊維からなる群から選択される1種以上を含むことを特徴とする請求項1から7のいずれか一項に記載のセリア‐炭素‐硫黄複合体。
- 前記セリア粒子の粒径は10ないし30nmであることを特徴とする請求項1から8のいずれか一項に記載のセリア‐炭素‐硫黄複合体。
- 前記セリア粒子は、セリア‐炭素複合体の総重量に対して10ないし50重量%で含まれることを特徴とする請求項1から9のいずれか一項に記載のセリア‐炭素‐硫黄複合体。
- 前記セリア‐炭素複合体の直径は3ないし10μmであることを特徴とする請求項1から10のいずれか一項に記載のセリア‐硫黄‐炭素複合体。
- 前記セリア‐炭素‐硫黄複合体は、セリア‐炭素複合体及び硫黄を1:9ないし9:1の重量比で含むことを特徴とする請求項1から11のいずれか一項に記載のセリア‐炭素‐硫黄複合体。
- (a)鋳型粒子及び円柱型炭素材が混合された分散液を製造する段階;
(b)前記分散液を噴霧乾燥して鋳型粒子‐炭素複合体を製造する段階;
(c)前記鋳型粒子‐炭素複合体を熱処理して階層型気孔構造の炭素凝集体を製造する段階;
(d)前記炭素凝集体及びセリウム前駆体の混合液を製造する段階;
(e)前記混合液を加熱した後、酸を添加して水熱反応によってセリア‐炭素(CeO2‐C)複合体を製造する段階;及び
(f)前記セリア‐炭素複合体に硫黄を含浸させてセリア‐炭素‐硫黄複合体を製造する段階;を含むセリア‐炭素‐硫黄(CeO2‐C‐S)複合体の製造方法。 - 前記(a)段階の円柱型炭素材及び鋳型粒子は、1:1ないし1:5の重量比で混合されることを特徴とする請求項13に記載のセリア‐炭素‐硫黄複合体の製造方法。
- 前記(c)段階の熱処理は、不活性雰囲気で600ないし1200℃で行われることを特徴とする請求項13または14に記載のセリア‐炭素‐硫黄複合体の製造方法。
- 前記(e)段階の水熱反応は70ないし150℃で行われ、前記温度を維持して酸を添加することを特徴とする請求項13から15のいずれか一項に記載のセリア‐炭素‐硫黄複合体の製造方法。
- 前記酸は、塩酸、6‐アミノヘキサン酸、硝酸及び酢酸からなる群から選択される1種以上を含むことを特徴とする請求項13から16のいずれか一項に記載のセリア‐炭素‐硫黄複合体の製造方法。
- 請求項1ないし請求項12のいずれか一項に記載のセリア‐炭素‐硫黄複合体を含むリチウム‐硫黄電池用正極。
- 請求項18に記載の正極;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‐硫黄電池。
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