JP2018508116A - 二次電池用正極活物質及びこれを含む二次電池 - Google Patents
二次電池用正極活物質及びこれを含む二次電池 Download PDFInfo
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- JP2018508116A JP2018508116A JP2017567035A JP2017567035A JP2018508116A JP 2018508116 A JP2018508116 A JP 2018508116A JP 2017567035 A JP2017567035 A JP 2017567035A JP 2017567035 A JP2017567035 A JP 2017567035A JP 2018508116 A JP2018508116 A JP 2018508116A
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- positive electrode
- lithium
- active material
- electrode active
- secondary battery
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Abstract
Description
本出願は、2015年12月23日付韓国特許出願第10−2015−0184811号及び2016年12月20日付韓国特許出願第10−2016−0174986号に基づいた優先権の利益を主張し、当該韓国特許出願の文献に開示されている全ての内容は本明細書の一部として含まれる。
本発明は、優れた高温安定性を有する二次電池用正極活物質、及びこれを含む二次電池に関する。
リチウムコバルト酸化物を含むコアを含み、
前記コアの表面上に、Al、Mg、W、Mo、Zr、Ti、Ta、Fe、V、Cr、Ba、Ca及びNbからなる群より選択されるいずれか一つまたは二つ以上の金属を含むリチウム−金属酸化物及び金属酸化物をさらに含み、
前記リチウム−金属酸化物は、前記リチウムコバルト酸化物と金属酸化物の熱融着物である。
[化学式(1)]
Li1+aCoM1 bO2
前記化学式(1)で、M1は、Al、Mg、W、Mo、Zr、Ti、Ta、Fe、V、Cr、Ba、Ca及びNbからなる群より選択されるいずれか一つまたは二つ以上のドーピング元素であり、a及びbは、それぞれ独立的な酸化物組成元素の原子分率であって、−0.05≦a≦0.05、0≦b≦0.02である。
[化学式(2)]
LimM2O(m+n)/2
前記化学式(2)で、M2は、Al、Mg、W、Mo、Zr、Ti、Ta、Fe、V、Cr、Ba、Ca及びNbからなる群より選択されるいずれか一つまたは二つ以上の元素であって、2≦m≦10であり、nはMの酸化数である。
LiCoO2のコア(平均粒径(D50)=6μm)100重量部に対してAl2O3粉末の0.1重量部を混合したあと、200℃で2時間の間1次熱処理し、引続き、750℃で5時間の間2次熱処理し、コアの表面及び表面側に熱融着物としてリチウム−アルミニウム酸化物及びアルミニウム酸化物を含む正極活物質を製造した。
LiCoO2の第1リチウムコバルト酸化物粒子(平均粒径(D50)=500nm)100重量部に対してAl2O3粉末の0.1重量部を混合したあと、200℃で2時間の間1次熱処理し、引続き、750℃で5時間の間2次熱処理して表面処理した。
LiCoO2のコア(平均粒径(D50)=6μm)100重量部に対してAl2O3粉末の0.1重量部を混合したあと、200℃で2時間の間熱処理し、コアの表面にAl2O3粒子が表面処理された正極活物質を製造した。
LiNi0.5Co0.2Mn0.3O2のコア(平均粒径(D50)=6μm)100重量部に対してTiO2の0.1重量部を混合したあと、600℃で7時間の間熱処理し、コアの表面にリチウム−チタン酸化物及びチタン酸化物を含む正極活物質を製造した。
前記実施例1−1、1−2及び比較例1−1、1−2で製造した正極活物質をそれぞれ利用してリチウム二次電池を製造した。
前記実施例1−1及び比較例1−1で製造した正極活物質を透過電子顕微鏡(TEM)で観察した。その結果を図1及び図2にそれぞれ示した。
前記実施例1−1及び比較例1−1、1−2での正極活物質をそれぞれ含む半電池を製造し、下記のような方法で電池のサイクル特性を評価した。
前記実施例1−1及び比較例1−1、1−2での正極活物質をそれぞれ含む半電池を製造し、下記のような方法で電池のガス発生量を測定した。
Claims (14)
- リチウムコバルト酸化物を含むコアを含み、
前記コアの表面上に、Al、Mg、W、Mo、Zr、Ti、Ta、Fe、V、Cr、Ba、Ca及びNbからなる群より選択されるいずれか一つまたは二つ以上の金属を含む、リチウム−金属酸化物及び金属酸化物をさらに含み、
前記リチウム−金属酸化物は、前記リチウムコバルト酸化物と金属酸化物の熱融着物であるものである二次電池用正極活物質。 - 前記正極活物質は、前記コアの表面から中心までの総距離に対し、コアの表面から0%以上で100%未満の距離に該当する領域内にリチウム−金属酸化物及び金属酸化物をさらに含むものである請求項1に記載の二次電池用正極活物質。
- 前記リチウム−金属酸化物及び金属酸化物は、Al、Mg及びTiからなる群より選択されるいずれか一つまたは二つ以上の金属を含むものである請求項1に記載の二次電池用正極活物質。
- 前記リチウム−金属酸化物及び金属酸化物は、Alを含むものである請求項1に記載の二次電池用正極活物質。
- 前記コアは、表面に凹凸を含むものである請求項1に記載の二次電池用正極活物質。
- 前記凹凸は、凹部及び凸部を含み、
前記凹部は、リチウム−金属酸化物及び金属酸化物で部分または全体が埋め込まれているものである請求項5に記載の二次電池用正極活物質。 - 平均粒径(D50)が2μmから20μmであるものである請求項1に記載の二次電池用正極活物質。
- リチウムコバルト酸化物の粒子を金属含有原料物質で表面処理したあと、200℃から500℃での1次熱処理及び600℃から1200℃での2次熱処理を順次行う段階を含むか;または2μm以下の平均粒径を有する第1リチウムコバルト酸化物粒子と、6μm以上の平均粒径を有する第2リチウムコバルト酸化物粒子を混合したあと、600℃以上の温度で熱処理をする段階を含み、
前記第1リチウムコバルト酸化物粒子;または前記第1リチウムコバルト酸化物粒子と第2リチウムコバルト酸化物粒子の両方ともは金属含有原料物質で表面処理されたものであり、
前記金属は、Al、Mg、W、Mo、Zr、Ti、Ta、Fe、V、Cr、Ba、Ca及びNbからなる群より選択されるいずれか一つまたは二つ以上の元素を含むものである、請求項1に記載の二次電池用正極活物質の製造方法。 - 請求項1から請求項7のいずれか一項に記載の正極活物質を含む二次電池用正極。
- 請求項9に記載の正極を含むリチウム二次電池。
- 請求項10に記載のリチウム二次電池を単位セルとして含む電池モジュール。
- 請求項11に記載の電池モジュールを含む電池パック。
- 中大型デバイスの電源として用いられるものである請求項12に記載の電池パック。
- 前記中大型デバイスが、電気自動車、ハイブリッド電気自動車、プラグインハイブリッド電気自動車及び電力貯蔵用システムからなる群より選択されるものである請求項13に記載の電池パック。
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