JP7257475B2 - リチウム複合酸化物及びその製造方法 - Google Patents
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Description
本発明において、前記リチウム複合酸化物内の残留リチウムと前記リチウム低減用金属化合物とが反応して形成されるリチウム化合物は、下記の化学式2で表示される。
本発明は、上記化学式1で表示される正極活物質の表面に上記化学式2で表示されるリチウム化合物を含み、上記化学式1の正極活物質と上記化学式2のリチウム化合物とは、結晶構造が互いに相違したことを特徴とする。
リチウム複合酸化物を用意するステップと、
前記リチウム複合酸化物をリチウム低減用金属化合物と混合するステップと、
前記リチウム複合酸化物と前記リチウム低減用金属化合物との混合物を、エネルギーを印加しつつ攪拌するステップとを含む本発明に係るリチウム複合酸化物の製造方法を提供する。
防止されて、容量が大きく増加するという効果を奏する。
<実施例>リチウム複合酸化物の製造
共沈反応によってリチウム複合酸化物を製造するために、NiCo(OH)2及びNiCoAl(OH)2で表示される前駆体を製造した。
活物質製造後、Co3O4又はCoSO4塩が含まれた溶液で水洗工程を行うことを除いては、上記実施例1と同様にして、比較例1の正極活物質を製造した。
<実験例>XPS測定
上記実施例及び比較例において製造した二次電池正極活物質のXPSを測定し、その結果を図2及び下記の表2に示す。
上記実施例及び比較例において製造した正極活物質の残留リチウムを測定した。
上記実施例及び比較例において製造された二次電池正極活物質を用いて電池を製造した。
<実験例>電池特性測定-容量特性
前記製造例において製造された本発明の正極活物質及び比較例の正極活物質を含む電池の初期容量を測定し、その結果を表4に示す。
上記製造例において製造された本発明の正極活物質及び比較例の正極活物質を含む電池の寿命特性及び高温保存特性を保存前後の抵抗として測定し、その結果を表5及び表6に示す。
Claims (5)
- 表面でNi3+の含量がNi2+含量より高く、Ni3+/Ni2+の比が1.5以上であるリチウム複合酸化物であって、
前記リチウム複合酸化物は、下記の化学式1で表示される酸化物と、下記の化学式2で表示されるリチウム化合物とを含み、
前記化学式1で表示される酸化物と前記化学式2で表示されるリチウム化合物との結晶構造が相互に異なるリチウム複合酸化物。
- 下記の化学式1で表示される酸化物を用意するステップと、
前記酸化物をリチウム低減用金属化合物と混合するステップと、
前記酸化物と前記リチウム低減用金属化合物との混合物を、エネルギーを印加しつつ攪拌するステップと、
表面でNi3+の含量がNi2+含量より高く、Ni3+/Ni2+の比が1.5以上に制御されたリチウム複合酸化物を形成する、
を含む請求項1によるリチウム複合酸化物の製造方法。
- 前記リチウム低減用金属化合物は、固体状態である請求項2に記載のリチウム複合酸化物の製造方法。
- 前記リチウム低減用金属化合物は、MOH、MOOH、MOx(前記Mは、Co、Ni、Al、Ba、B、Ti、Mn、Mg、Fe、Cu、Ag、Ca、Na、K、In、Ga
、Ge、V、Mo、Nb、Si、及びZrからなる群より選ばれ、0.001≦x≦2で
ある)からなる群より選ばれるものである請求項2に記載のリチウム複合酸化物の製造方法。 - 前記リチウム低減用金属化合物は、Co3O4、CoOOH、及びCo(OH)2からなる群より選ばれるものである請求項2に記載のリチウム複合酸化物の製造方法。
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CN112886006B (zh) * | 2021-04-28 | 2021-08-06 | 蜂巢能源科技有限公司 | 一种单晶高镍正极材料及其制备方法和应用 |
KR20230038123A (ko) * | 2021-09-10 | 2023-03-17 | 주식회사 엘지에너지솔루션 | 양극 활물질, 그 제조 방법, 이를 포함하는 양극 및 리튬 이차 전지 |
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KR20190059846A (ko) | 2019-05-31 |
US20230067781A1 (en) | 2023-03-02 |
CN109921015A (zh) | 2019-06-21 |
JP6953382B2 (ja) | 2021-10-27 |
CN109921015B (zh) | 2022-07-22 |
CN115215379A (zh) | 2022-10-21 |
JP2019094256A (ja) | 2019-06-20 |
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