JP4465264B2 - 寿命特性と安全性に優れたリチウム金属複合酸化物およびその製造方法 - Google Patents
寿命特性と安全性に優れたリチウム金属複合酸化物およびその製造方法 Download PDFInfo
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Description
1)リチウム金属複合酸化物を提供するステップと、
2)熱処理後に非晶質リチウムコバルト複合酸化物の被覆層を形成する原料の混合物を提供するステップと、
3)上記ステップ2)の混合物をステップ1)のリチウム金属複合酸化物に被覆するステップと、
4)上記ステップ3)の被覆されたリチウム金属複合酸化物を焼成するステップと、
を含むリチウム金属複合酸化物の製造方法に係る。
[実施例]
表2によると、表面を被覆した場合、より優れた高率放電特性を見せていることが分かる。
Claims (10)
- リチウム金属複合酸化物のコア粒子に非晶質リチウムコバルト複合酸化物が被覆されたリチウム金属複合酸化物を含む正極活物質であって、前記コア粒子は、リチウムコバルト系複合酸化物であり、前記被覆層は、化学式Li1+xCo1−x−yAyO2のリチウムコバルト複合酸化物を含む非晶質酸化物であり、ここで、0≦x≦0.1、0≦y≦0.5であり、AはAlであることを特徴とする被覆されたリチウム金属複合酸化物を含む正極活物質。
- 前記コア粒子は、LiCoO2 又は少なくとも1種の金属がドープされたLiCoO 2 であることを特徴とする請求項1に記載の正極活物質。
- 被覆層の量は、被覆層が熱処理後、酸化されるという仮定下で、モル比で0.1〜10モル%であることを特徴とする請求項1に記載の正極活物質。
- 1)コア粒子であるリチウム金属複合酸化物を提供するステップと、
2)非晶質リチウムコバルト複合酸化物を形成する被覆層原料の混合物を提供するステップと、
3)前記ステップ2)の混合物をステップ1)のリチウム金属複合酸化物に被覆するステップと、
4)前記ステップ3)の被覆されたリチウム金属複合酸化物を焼成するステップと;
を含むことを特徴とする請求項1に記載のリチウム金属複合酸化物を含む正極活物質の製造方法。 - ステップ1)で前記コア粒子は、LiCoO2 又は少なくとも1種の金属がドープされたLiCoO 2 であることを特徴とする請求項4に記載の方法。
- ステップ2)における被覆層をなす非晶質リチウムコバルト複合酸化物の原料は、前記被覆層をなす元素の炭酸塩、窒酸塩、水酸塩、硫酸塩、酢酸塩、クエン酸塩、塩化物、水酸化物および酸化物より選ばれた1種以上であり、溶媒は水又は有機溶媒であることを特徴とする請求項4に記載の方法。
- ステップ2)において、被覆層の量は、被覆層が熱処理後酸化されるという仮定下で、モル比で0.1〜10モル%であることを特徴とする請求項4に記載の方法。
- ステップ3)の被覆は、コア粒子を空気中に流動化させた後、被覆層を形成する混合物溶液をコア粒子に噴霧乾燥させ被覆する方法、又は、コア粒子と被覆層原料との混合物で構成された懸濁液を形成した後、攪拌と同時に高温の熱風を加えて被覆する方法、若しくは、コア粒子を被覆層原料の混合物の懸濁液に一定の時間滞留させた後、乾燥して被覆する方法により行われることを特徴とする請求項4に記載の方法。
- ステップ4)において、コア粒子であるリチウム金属複合酸化物粒子の表面に、非晶質リチウムコバルト複合酸化物を形成するための熱処理は、200〜800℃の温度で、0.1〜10時間行われることを特徴とする請求項4に記載の方法。
- リチウム又はリチウムイオン2次電池として使用されることを特徴とする請求項1に記載の正極活物質。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020020022167A KR20030083476A (ko) | 2002-04-23 | 2002-04-23 | 수명 특성과 안전성이 우수한 리튬 금속 복합 산화물 및이의 제조 방법 |
PCT/KR2003/000815 WO2003092099A1 (en) | 2002-04-23 | 2003-04-22 | Complex lithium metal oxides with enhanced cycle life and safety and a process for preparation thereof |
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JP2005524204A JP2005524204A (ja) | 2005-08-11 |
JP4465264B2 true JP4465264B2 (ja) | 2010-05-19 |
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JP2004500352A Expired - Lifetime JP4465264B2 (ja) | 2002-04-23 | 2003-04-22 | 寿命特性と安全性に優れたリチウム金属複合酸化物およびその製造方法 |
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US (1) | US7235193B2 (ja) |
EP (1) | EP1497876B1 (ja) |
JP (1) | JP4465264B2 (ja) |
KR (1) | KR20030083476A (ja) |
CN (1) | CN1565063A (ja) |
AU (1) | AU2003222488A1 (ja) |
WO (1) | WO2003092099A1 (ja) |
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- 2003-04-22 EP EP03717762A patent/EP1497876B1/en not_active Expired - Lifetime
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US11038159B2 (en) | 2017-01-31 | 2021-06-15 | Lg Chem, Ltd. | Positive electrode active material for lithium secondary battery including lithium cobalt oxide having core-shell structure, method for producing the same, and positive electrode and secondary battery including the positive electrode active material |
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EP1497876A4 (en) | 2010-10-27 |
AU2003222488A1 (en) | 2003-11-10 |
KR20030083476A (ko) | 2003-10-30 |
JP2005524204A (ja) | 2005-08-11 |
EP1497876B1 (en) | 2012-05-23 |
EP1497876A1 (en) | 2005-01-19 |
US20040200998A1 (en) | 2004-10-14 |
US7235193B2 (en) | 2007-06-26 |
WO2003092099A1 (en) | 2003-11-06 |
CN1565063A (zh) | 2005-01-12 |
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