JP6204196B2 - 全粒子濃度勾配を有するリチウム二次電池の正極活物質、その製造方法、及びそれを含むリチウム二次電池 - Google Patents
全粒子濃度勾配を有するリチウム二次電池の正極活物質、その製造方法、及びそれを含むリチウム二次電池 Download PDFInfo
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Description
下記化学式1で表される中心部及び
下記化学式2で表される表面部を含み、
前記M1の濃度は、前記中心部から前記表面部まで一定であり、
前記M2の濃度及び前記M3の濃度は、前記中心部から前記表面部に行くほど連続的濃度勾配を有することを特徴とする。
Lia1M1xM2y1M3Z1M4WO2+δ
[化学式2]
Lia2M1xM2y2M3Z2M4WO2+δ
前記化学式1、2において、M1、M2及びM3は、Ni、Co、Mn及びこれらの組み合わせからなる群より選択され、M4はFe、Na、Mg、Ca、Ti、V、Cr、Cu、Zn、Ge、Sr、Ag、Ba、Zr、Nb、Mo、Al、Ga、B及びこれらの組み合わせからなる群より選択され、0<a1≦1.1、0<a2≦1.1、0≦x≦1、0≦y1≦1、0≦y2≦1、0≦z1≦1、0≦z2≦1、0≦w≦0.1、0.0≦δ≦0.02、0<x+y1+z1≦1、0<x+y2+z2≦1であり、y1≦y2、z2≦z1である。
中心部形成用金属塩水溶液と表面部形成用金属塩水溶液を備える第1の段階と、
前記中心部形成用金属塩水溶液と前記表面部形成用金属塩水溶液の混合比率が100v%:0v%から0v%:100v%まで緩やかに変化するように混合すると共に、キレート剤及び塩基性水溶液を反応器に混合して、前記M1の濃度は前記中心部から前記表面部まで一定であり、前記M2、M3の濃度は中心部から表面部まで連続的な濃度勾配を有するように沈殿物を形成する第2の段階と、
前記得られた沈殿物を乾燥又は熱処理して、活物質前駆体を製造する第3の段階と、
前記活物質前駆体とリチウム塩とを混合した後、熱処理する第4の段階とを含むリチウム二次電池用正極活物質の製造方法を提供する。
<実施例1-1>
中心から表面までNiの濃度が一定であり、Coの濃度は減少し、Mnの濃度は増加する化合物を製造するために、中心部形成用金属塩水溶液として硫酸ニッケル:硫酸コバルトを80:20のモル比で混合した2.4M濃度の金属水溶液と、表面部形成用金属塩水溶液として硫酸ニッケル:硫酸マンガンを80:20のモル比で含む金属水溶液を備えた。
中心部から表面部までNiの濃度が一定であり、Coの濃度は減少し、Mnの濃度は増加する化合物を製造するために、中心部形成用金属塩水溶液と表面部形成用金属塩水溶液の硫酸ニッケル:硫酸コバルト:硫酸マンガンのモル比を、下記表1のようにすることを除いては、前記実施例1−1と同様にして活物質粒子を得た。
前記実施例1-3と同じ組成、同じ構造の正極活物質を、回分式反応器を用いて製造した。
比較例として、ニッケル、コバルト、マンガンのモル比がそれぞれ下記表2の通りであり、活物質全体でそれぞれの濃度が変わらず、一定の組成を示すように、正極活物質を製造した。
本発明の前駆体粒子で、中心部から表面部に至るまでそれぞれ金属の濃度勾配構造を確認するために、EPMA(電子線マイクロアナライザ:Electron Probe Micro Analyzer)を用いて、中心部から表面部に移動しながら、前記実施例1-1〜1-5で製造された各前駆体粒子における元素比(atomic ratio)を測定し、その結果をそれぞれ図1〜図5に示した。
本発明の前駆体を熱処理した後、粒子の中心部から表面部までそれぞれ金属の濃度が勾配を示すか確認するために、前記実施例1-1〜1-5で製造された粒子を熱処理し、その後、EPMAを用いて、中心部から表面部に移動しながら、元素比を測定し、その結果をそれぞれ図6〜図10に示した。
前記実施例1-1〜1-5で製造された前駆体と最終の活物質粒子の表面写真を走査電子顕微鏡で測定し、その結果をそれぞれ次の図11〜図15及び図16〜図20に示した。
前記実施例1-1〜1-5で製造された各活物質と前記比較例1-1〜1-4で製造された活物質とを用いて正極を製造し、これを円筒形リチウム二次電池に適用した。
前記実施例1-1〜1-4で製造された各活物質と前記比較例1-1〜1-4で製造された活物質とを含む正極を、それぞれ4.3V充電させた状態で、示差走査熱量計(DSC)を用いて、10℃/minの速度で昇温させながら測定し、その結果を次の図26〜図29に示した。
<実施例2-1>
中心から表面までCoの濃度が一定であり、Niの濃度は減少し、Mnの濃度は増加する化合物を製造するために、中心部形成用金属塩水溶液として硫酸ニッケル:硫酸コバルトを90:10のモル比で混合した2.4M濃度の金属水溶液と、表面部形成用金属塩水溶液として硫酸ニッケル:硫酸コバルト:硫酸マンガンを65:10:25のモル比で含む金属水溶液を備え、前記実施例1-1-と同様に前駆体を製造した。
本発明の前駆体粒子で、中心から表面に至るまでそれぞれ金属の濃度勾配構造を確認するために、前記実験例1-1のような方法でEPMAを用いて、中心から表面に移動しながら、前記実施例2-1で製造された前駆体粒子での元素比を測定し、その結果をそれぞれ図31に示した。
本発明の前駆体を熱処理した後、活物質粒子で中心から表面に至るまでそれぞれ金属の濃度勾配構造を確認するために、前記実施例2-1で製造された粒子を前記実験例1-2のような方法でEPMAを用いて、中心から表面に移動しながら、 元素比を測定し、その結果をそれぞれ図32に示した。
前記実施例2-1と前記比較例2-1で製造された前駆体と最終の活物質粒子の表面写真を走査電子顕微鏡で測定し、その結果をそれぞれ次の図33〜図34に示した。
前記実施例2-1で製造された各活物質と前記比較例2-1で製造された活物質とを用いて正極を製造し、これを円筒形リチウム二次電池に適用した。
前記実施例2-1と比較例2-1で製造された活物質を含む正極を、それぞれ4.3V充電させた状態で、示差走査熱量計(DSC)を用いて、10℃/minの速度で昇温させながら測定し、その結果を次の図36に示した。
Claims (15)
- リチウム二次電池の正極活物質において、
前記リチウム二次電池の正極活物質を構成する金属M2及びM3の濃度が、粒子の中心から表面までの全領域で連続的に濃度勾配を示し、
前記正極活物質の中心部の組成は、下記化学式1で表され、
[化学式1]
Lia1M1xM2y1M3z1M4wO2+δ
前記正極活物質の表面部の組成は、下記化学式2で表され、
[化学式2]
Lia2M1xM2y2M3z2M4wO2+δ
(前記化学式1、2でM1、M2及びM3は、Ni、Co、Mn及びこれらの組み合わせからなる群より選択され、M4はFe、Na、Mg、Ca、Ti、V、Cr、Cu、Zn、Ge、Sr、Ag、Ba、Zr、Nb、Mo、Al、Ga、B及びこれらの組み合わせからなる群より選択され、0<a1≦1.1、0<a2≦1.1、0≦x≦1、0≦y1≦1、0≦y2≦1、0≦z1≦1、0≦z2≦1、0≦w≦0.1、0.0≦δ≦0.02、0<x+y1+z1≦1、0<x+y2+z2≦1であり、y1<y2、z2<z1である。)
前記中心部から前記表面部までM1の濃度は一定であり、前記中心部から前記表面部に行くほどM2の濃度及びM3の濃度は連続的濃度勾配を有することを特徴とする全粒子濃度勾配を有するリチウム二次電池の正極活物質。 - 前記M2の濃度は、前記中心部から前記表面部に行くほど連続的濃度勾配を有しながら増加し、
前記M3の濃度は、前記中心部から前記表面部に行くほど連続的濃度勾配を有しながら減少することを特徴とする請求項1に記載のリチウム二次電池正極活物質。 - 前記M1はNi、前記M2はMn、前記M3はCoであることを特徴とする請求項2に記載のリチウム二次電池正極活物質。
- 前記M1はCo、前記M2はMn、前記M3はNiであることを特徴とする請求項2に記載のリチウム二次電池正極活物質。
- 前記M1はMn、前記M2はCo、前記M3はNiであることを特徴とする請求項2に記載のリチウム二次電池正極活物質。
- 前記M1の濃度xの範囲が0.4≦x≦1であることを特徴とする請求項3に記載のリチウム二次電池正極活物質。
- 前記M1の濃度の範囲が0.6≦x≦0.9であり、0.2≦|y2−y1|≦0.4、0.2≦|z2−z1|≦0.4、0.2≦y2≦0.4、0≦z2≦0.1であることを特徴とする請求項6に記載のリチウム二次電池正極活物質。
- 前記M2の濃度勾配の傾きが、粒子の中心部から表面部まで一定であることを特徴とする請求項2に記載のリチウム二次電池正極活物質。
- 前記M3の濃度勾配の傾きが、粒子の中心部から表面部まで一定であることを特徴とする請求項2に記載のリチウム二次電池正極活物質。
- 金属塩水溶液としてM1、M2、M3を含み、前記M1の濃度が互いに同一であり、前記M2の濃度とM3の濃度は互いに異なる中心部形成用金属塩水溶液と表面部形成用金属塩水溶液とを備える第1の段階と、
前記中心部形成用金属塩水溶液と前記表面部形成用金属塩水溶液との混合比率が100v%:0v%から0v%:100v%まで緩やかに変化するように混合すると共に、キレート剤及び塩基性水溶液を反応器に混合して、前記M1の濃度は、中心から表面まで一定であり、前記M2、M3の濃度は、中心から表面までの全領域で連続的濃度勾配を有するように沈殿物を形成する第2の段階と、
前記得られた沈殿物を乾燥又は熱処理して、活物質前駆体を製造する第3の段階と、
前記活物質前駆体とリチウム塩とを混合した後、熱処理する第4の段階とを含むリチウム二次電池正極活物質の製造方法。 - 前記キレート剤と前記金属塩水溶液とのモル比は、0.2〜1.0:1である請求項10に記載のリチウム二次電池正極活物質の製造方法。
- 前記活物質前駆体とリチウム塩とを混合した後の熱処理工程は、700℃〜1100℃で施す請求項10に記載のリチウム二次電池正極活物質の製造方法。
- 前記活物質前駆体とリチウム塩とを混合した後、熱処理する前に250℃〜650℃で5時間〜20時間維持させて予備焼成する工程をさらに含む請求項10に記載のリチウム二次電池正極活物質の製造方法。
- 前記第2の段階では、窒素の流れの下で、pHは10〜12.5以内、反応温度は30℃〜80℃以内、反応攪拌速度は100rpm〜2000rpm以内である請求項10に記載のリチウム二次電池正極活物質の製造方法。
- 請求項1〜9のうちいずれか一つに記載のリチウム二次電池正極活物質を含むリチウム二次電池。
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