KR20080098261A - 나노파이버 네트워크 구조의 음극 활물질을 구비한이차전지용 음극 및 이를 이용한 이차전지와, 이차전지용음극 활물질의 제조방법 - Google Patents
나노파이버 네트워크 구조의 음극 활물질을 구비한이차전지용 음극 및 이를 이용한 이차전지와, 이차전지용음극 활물질의 제조방법 Download PDFInfo
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Abstract
Description
Claims (14)
- 음극 집전체와,상기 집전체의 적어도 일면에 압착되어, 나노그레인(nano-grain)과 나노로드(nano-rod) 중 적어도 하나를 포함하여 이루어진 나노파이버(nano-fiber)의 네트워크 구조를 갖는 다공성 금속산화물 박층인 음극 활물질을 포함하는 이차전지용 음극.
- 제 1 항에 있어서,상기 나노파이버의 평균 직경은 10∼600 ㎚이고, 상기 나노그레인 및 나노로드의 평균 크기는 5∼100 nm인 것을 특징으로 하는 이차전지용 음극.
- 제 1 항에 있어서,상기 나노그레인들 사이 및 상기 나노로드들 사이에는 평균 1∼100 ㎚ 크기의 기공이 형성된 것을 특징으로 하는 이차전지용 음극.
- 제 1 항에 있어서,상기 집전체는 백금(Pt), 금(Au), 팔라듐(Pd), 이리듐(Ir), 은(Ag), 로듐(Rh), 루테늄(Ru), 니켈(Ni), 스테인리스 스틸, 알루미늄(Al), 몰리브데늄(Mo), 크롬(Cr), 구리(Cu) 또는 텅스텐(W) 재질이거나, 혹은 ITO(In doped SnO2) 또는 FTO(F doped SnO2) 재질이거나, 혹은 Si 웨이퍼에 형성된 금속 재질인 것을 특징으로 하는 이차전지용 음극.
- 제 1 항에 있어서,상기 금속산화물은 주석산화물(SnO2), TiO2, Fe2O3, Fe3O4, CoO, Co3O4, CuO, ZnO, In2O3, NiO, MoO3, WO3으로 이루어진 군에서 선택된 적어도 어느 하나인 것을 특징으로 하는 이차전지용 음극.
- 음극 집전체 및 이 집전체의 적어도 일면에 압착 형성된 음극 활물질을 구비하는 음극과, 전해질과, 양극을 포함하여 이루어지며,상기 음극 활물질은 나노 그레인과 나노 로드 중 적어도 하나를 포함하여 이루어진 나노 파이버들의 네트워크 구조를 갖는 다공성 금속산화물 박층인 것을 특징으로 하는 이차전지.
- 집전체 위에 금속산화물의 전구체와 고분자를 혼합한 용액을 방사하여 상기 금속산화물의 전구체와 고분자가 혼합된 복합 섬유를 형성하는 공정과,상기 복합 섬유를 열 압착 또는 열 가압하는 공정과,상기 열 압착 또는 열 가압된 복합 섬유를 열처리하여 상기 복합 섬유에서 고분자를 제거하는 공정을 포함하는 이차전지용 음극 활물질의 제조방법.
- 제 7 항에 있어서,상기 금속산화물의 전구체는 Sn, Ti, Ni, Fe, Co, Cu, Zn, In, Mo, 또는 W 이온을 포함하며, 고분자와 혼합되어 방사 후 열처리를 통해 SnO2, TiO2, NiO, Fe2O3, Fe3O4, CoO, Co3O4, CuO, ZnO, In2O3, MoO3, 또는 WO3 산화물 형성이 가능한 것을 특징으로 하는 이차전지용 음극 활물질의 제조방법.
- 제 7 항에 있어서,상기 고분자는 폴리우레탄, 폴리에테르우레탄, 폴리우레탄 공중합체, 셀룰로오스 아세테이트, 셀룰로오스 아세테이트 부틸레이트, 셀룰로오스 아세테이트 프로피오네이트, 폴리메틸메스아크릴레이트(PMMA), 폴리메틸아크릴레이트(PMA), 폴리아크릴 공중합체, 폴리비닐아세테이트(PVAc), 폴리비닐아세테이트 공중합체, 폴리비닐알콜(PVA), 폴리퍼퓨릴알콜(PPFA), 폴리스티렌, 폴리스티렌 공중합체, 폴리에틸렌 옥사이드(PEO), 폴리프로필렌옥사이드(PPO), 폴리에틸렌옥사이드 공중합체, 폴리프로필렌옥사이드 공중합체, 폴리카보네이트(PC), 폴리비닐클로라이드(PVC), 폴리카프로락톤, 폴리비닐피롤리돈(PVP), 폴리비닐풀루오라이드, 폴리비닐리덴풀루오라이드 공중합체 및 폴리아마이드 중에서 선택된 적어도 어느 하나인 것을 특징으로 하는 이차전지용 음극 활물질의 제조방법.
- 제 7 항에 있어서,상기 방사는 전기방사(electro-spinning), 멜트블로운(melt-blown), 플레쉬방사(flash spinning) 또는 정전멜트블로운법(electrostatic melt-blown)인 것을 특징으로 하는 이차전지용 음극 활물질의 제조방법.
- 제 7 항에 있어서,상기 열 압착 공정은, 상기 고분자의 유리 전이 온도 이상의 온도에서 압력을 가함으로써 상기 복합 섬유 중 고분자를 부분 또는 전체적으로 용융하여 상기 집전체와의 접착성을 높여주는 것을 특징으로 하는 이차전지용 음극 활물질의 제조방법.
- 제 7 항에 있어서,상기 고분자는 폴리비닐아세테이트(PVAc)이며, 120℃의 온도에서 1∼10분간 1.5 Kgf/㎠(21.34 psi)의 압력으로 압착하는 것을 특징으로 하는 이차전지용 음극 활물질의 제조방법.
- 제 7 항에 있어서,상기 열 가압 공정은, 상기 고분자의 유리 전이 온도 이상의 온도에서 가열과정을 통해 고분자의 용융을 유도하거나, 혹은 상기 고분자의 유리 전이 온도 이 상의 온도를 갖는 압축공기를 이용하여 가압함으로써 고분자의 용융을 유도하는 것을 특징으로 하는 이차전지용 음극 활물질의 제조방법.
- 제 7 항에 있어서,상기 열처리는 상기 금속산화물의 전구체의 종류에 따라 200∼800℃의 온도 범위에서 이루어지는 것을 특징으로 하는 이차전지용 음극 활물질의 제조방법.
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KR1020070043722A KR100868290B1 (ko) | 2007-05-04 | 2007-05-04 | 나노파이버 네트워크 구조의 음극 활물질을 구비한이차전지용 음극 및 이를 이용한 이차전지와, 이차전지용음극 활물질의 제조방법 |
US12/112,423 US8048567B2 (en) | 2007-05-04 | 2008-04-30 | Anode for secondary battery having negative active material with nano-fiber network structure and secondary battery using the same, and fabrication method of negative active material for secondary battery |
PCT/KR2008/002515 WO2008136622A1 (en) | 2007-05-04 | 2008-05-02 | Anode for secondary battery having negative active material with nano-fiber network structure and secondary battery using the same, and fabrication method of negative active material for secondary battery |
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Also Published As
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US8048567B2 (en) | 2011-11-01 |
US20080274403A1 (en) | 2008-11-06 |
WO2008136622A1 (en) | 2008-11-13 |
KR100868290B1 (ko) | 2008-11-12 |
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