JP7049551B2 - 二次電池用正極材及びこれを含むリチウム二次電池 - Google Patents
二次電池用正極材及びこれを含むリチウム二次電池 Download PDFInfo
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- JP7049551B2 JP7049551B2 JP2020520747A JP2020520747A JP7049551B2 JP 7049551 B2 JP7049551 B2 JP 7049551B2 JP 2020520747 A JP2020520747 A JP 2020520747A JP 2020520747 A JP2020520747 A JP 2020520747A JP 7049551 B2 JP7049551 B2 JP 7049551B2
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- positive electrode
- active material
- electrode active
- secondary battery
- transition metal
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- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
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Description
本出願は、2017年11月21日付韓国特許出願第10-2017-0155955号に基づく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た全ての内容は本明細書の一部として含まれる。
[化学式(1)]
LipNi1-(x1+y1+z1)Cox1Ma y1Mb z1Mc q1O2 (1)
第1正極活物質としてLiNi0.88Co0.10Mn0.02O2の粒子(D50=16μm)であり、粒子中心でのニッケル(Ni)の含量が89モル%、粒子表面でのニッケル(Ni)の含量が86モル%であり、ニッケル(Ni)の濃度が粒子の中心から表面まで漸進的に減少し、コバルト(Co)及びマンガン(Mn)の濃度が粒子の中心から表面まで漸進的に増加する濃度勾配を有するリチウム複合遷移金属酸化物を使用した。
第1正極活物質としてLiNi0.92Co0.04Mn0.04O2の粒子(D50=14μm)であり、粒子中心でのニッケル(Ni)の含量が93モル%、粒子表面でのニッケル(Ni)の含量が90モル%であり、ニッケル(Ni)の濃度が粒子の中心から表面まで漸進的に減少し、コバルト(Co)及びマンガン(Mn)の濃度が粒子の中心から表面まで漸進的に増加する濃度勾配を有するリチウム複合遷移金属酸化物を使用し、第2正極活物質としてLiNi0.92Co0.04Mn0.04O2の粒子(D50=4μm)であり、濃度勾配を有さずに、粒子表面にリチウムホウ素酸化物を含むコーティング層を形成したリチウム複合遷移金属酸化物を使用したことを除き、実施例1と同様に行って正極を製造した。
第1正極活物質としてLiNi0.87Co0.08Mn0.03Al0.02O2の粒子(D50=16μm)であり、粒子中心でのニッケル(Ni)の含量が88モル%、粒子表面でのニッケル(Ni)の含量が86モル%であり、ニッケル(Ni)の濃度が粒子の中心から表面まで漸進的に減少し、コバルト(Co)及びマンガン(Mn)の濃度が粒子の中心から表面まで漸進的に増加する濃度勾配を有するリチウム複合遷移金属酸化物を使用し、第2正極活物質としてLiNi0.88Co0.09Mn0.03O2の粒子(D50=5μm)であり、濃度勾配を有さずに、粒子表面にリチウムホウ素酸化物を含むコーティング層を形成したリチウム複合遷移金属酸化物を使用したことを除き、実施例1と同様に行って正極を製造した。
第1正極活物質としてLiNi0.70Co0.10Mn0.20O2の粒子(D50=16μm)であり、粒子中心でのニッケル(Ni)の含量が72モル%、粒子表面でのニッケル(Ni)の含量が69モル%であり、ニッケル(Ni)の濃度が粒子の中心から表面まで漸進的に減少し、コバルト(Co)及びマンガン(Mn)の濃度が粒子の中心から表面まで漸進的に増加する濃度勾配を有するリチウム複合遷移金属酸化物を使用し、第2正極活物質としてLiNi0.70Co0.10Mn0.20O2の粒子(D50=5μm)であり、濃度勾配を有さずに、粒子表面にリチウムホウ素酸化物を含むコーティング層を形成したリチウム複合遷移金属酸化物を使用したことを除き、実施例1と同様に行って正極を製造した。
正極活物質としてLiNi0.88Co0.10Mn0.02O2の粒子(D50=12μm)であり、粒子中心でのニッケル(Ni)の含量が89モル%、粒子表面でのニッケル(Ni)の含量が87モル%であり、ニッケル(Ni)の濃度が粒子の中心から表面まで漸進的に減少し、コバルト(Co)及びマンガン(Mn)の濃度が粒子の中心から表面まで漸進的に増加する濃度勾配を有するリチウム複合遷移金属酸化物をモノモーダル(monomodal)で使用したことを除き、実施例1と同様に行って正極を製造した。
第1正極活物質としてLiNi0.83Co0.11Mn0.06O2の粒子(D50=16μm)であり、濃度勾配を有しないリチウム複合遷移金属酸化物を使用し、第2正極活物質としてLiNi0.83Co0.11Mn0.06O2の粒子(D50=5μm)であり、濃度勾配を有しないリチウム複合遷移金属酸化物を使用したことを除き、実施例1と同様に行って正極を製造した。
実施例1から4及び比較例1から2で製造された正極の圧延密度及び大粒子の割れ程度を評価しており、その結果を表1に示した。
実施例1から実施例4及び比較例1から2によって製造された正極を用いてリチウム二次電池ハーフセル(Half cell)を製造した。
実験例2でのように実施例1から実施例4及び比較例1から2によって製造されたそれぞれの正極を使用して製造された各リチウム二次電池ハーフセル(half cell)に対して、45℃で0.33Cの電流値で充放電を進めるサイクリングを30回進行したときの容量維持率を測定し、高温寿命特性の評価を進めた。その結果を表3及び図2に示した。
Claims (14)
- 第1正極活物質及び第2正極活物質を含み、
前記第1正極活物質及び前記第2正極活物質は、ニッケル(Ni)、コバルト(Co)及びマンガン(Mn)からなる群から選択された少なくとも2種以上の遷移金属を含むリチウム複合遷移金属酸化物であり、
前記第1正極活物質の平均粒径(D50)は、前記第2正極活物質の平均粒径(D50)の2倍以上であり、
前記第1正極活物質のリチウム複合遷移金属酸化物に含有されたニッケル(Ni)、コバルト(Co)及びマンガン(Mn)のうち少なくとも一つが、リチウム複合遷移金属酸化物の粒子の中心と表面での濃度差が1.5モル%以上である濃度勾配を有し、
前記第2正極活物質は、粒子表面の少なくとも一部にコーティング層をさらに含み、前記コーティング層は、リチウムホウ素酸化物を含む、二次電池用正極材。 - 前記第1正極活物質は、リチウム複合遷移金属酸化物に含有されたニッケル(Ni)、コバルト(Co)及びマンガン(Mn)のうち少なくとも一つが、リチウム複合遷移金属酸化物の粒子の中心から表面まで漸進的に変化する濃度勾配を有する、請求項1に記載の二次電池用正極材。
- 前記第1正極活物質は、ニッケル(Ni)がリチウム複合遷移金属酸化物の粒子の中心から表面まで漸進的に減少する濃度勾配を有する、請求項1又は2に記載の二次電池用正極材。
- 前記第1正極活物質は、マンガン(Mn)及びコバルト(Co)のうち少なくとも一つがリチウム複合遷移金属酸化物の粒子の中心から表面まで漸進的に増加する濃度勾配を有する、請求項1から3のいずれか一項に記載の二次電池用正極材。
- 前記第1正極活物質及び前記第2正極活物質のリチウム複合遷移金属酸化物に含有された全金属元素のうちニッケル(Ni)の含量が60モル%以上である、請求項1から4のいずれか一項に記載の二次電池用正極材。
- 前記第1正極活物質及び前記第2正極活物質は、ニッケル(Ni)、コバルト(Co)、マンガン(Mn)及びアルミニウム(Al)を含むリチウム複合遷移金属酸化物である、請求項1から5のいずれか一項に記載に記載の二次電池用正極材。
- 前記第1正極活物質及び前記第2正極活物質は下記化学式(1)で表され、
[化学式(1)]
LipNi1-(x1+y1+z1)Cox1Ma y1Mb z1Mc q1O2 (1)
前記化学式(1)において、MaはMn及びAlからなる群から選択された少なくとも1種以上の元素であり、MbはBa、Ca、Zr、Ti、Mg、Ta、Nb及びMoからなる群から選択された少なくとも1種以上の元素であり、McはAl、Zr、Ti、Mg、Ta、Nb、Mo及びCrからなる群から選択される少なくとも1種以上の元素であり、0.9≦p≦1.5、0<x1≦0.4、0<y1≦0.4、0≦z1≦0.1、0≦q1≦0.1であり、0<x1+y1+z1≦0.4である、請求項1に記載の二次電池用正極材。 - 前記第1正極活物質及び前記第2正極活物質は、互いに同一または異なる組成のリチウム複合遷移金属酸化物である、請求項1に記載の二次電池用正極材。
- 前記第1正極活物質の平均粒径(D50)対前記第2正極活物質の平均粒径(D50)の比は5:1から2:1である、請求項1に記載の二次電池用正極材。
- 前記第1正極活物質の平均粒径(D50)は10から30μmである、請求項1に記載の二次電池用正極材。
- 前記第2正極活物質の平均粒径(D50)は1から10μmである、請求項1に記載の二次電池用正極材。
- 前記第1正極活物質と前記第2正極活物質は9:1から1:9の重量比で混合された、請求項1に記載の二次電池用正極材。
- 請求項1から12のいずれか一項に記載の二次電池用正極材を含む二次電池用正極。
- 請求項13に記載の二次電池用正極を含むリチウム二次電池。
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WO2019103460A1 (ko) | 2019-05-31 |
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US20200266438A1 (en) | 2020-08-20 |
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CN111226330A (zh) | 2020-06-02 |
HUE066240T2 (hu) | 2024-07-28 |
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