MANUFACTURING METHOD OF POSITIVE ELECTRODE MATERIAL OF NIKEL-RICH LITHIUM COMPOSITE TRANSITION METAL OXIDE AND MANUFACTURING METHOD OF POSITIVE ELECTRODE MATERIAL OF NIKEL-RICH LITHIUM COMPOSITE TRANSITION METAL OXIDE FORMED THEREFROM

The present invention relates to a method for preparing a positive electrode active material of nickel-rich lithium transition metal composite oxide. The method according to the present invention includes the steps of: (S1) oxidizing a composite transition metal hydroxide precursor having a nickel c...

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Bibliographische Detailangaben
Hauptverfasser: NAM JAEKEUN, KIM DONGHWAN, CHEONG SANGHUN, OH MYOUNGHWAN, NOH TAIMIN
Format: Patent
Sprache:eng ; kor
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Zusammenfassung:The present invention relates to a method for preparing a positive electrode active material of nickel-rich lithium transition metal composite oxide. The method according to the present invention includes the steps of: (S1) oxidizing a composite transition metal hydroxide precursor having a nickel content of 80 mol% or more based on the total transition metals through heat treatment at a temperature of 500-1000℃ to prepare an oxide precursor; (S2) mixing a lithium source material with the oxide precursor and primarily firing the resultant mixture under oxygen atmosphere at a temperature of 500-800℃, followed by cooling; and (S3) secondarily firing the primarily fired product under oxygen atmosphere at a temperature of 700-900℃. According to the method of the present invention, it is possible to obtain a positive electrode active material of lithium transition metal composite oxide having such a reduced content of lithium impurity that no water-washing step is required. 본 발명은 (S1) 전체 전이금속 중 니켈 함유량이 80 몰% 이상인 복합전이금속 수산화물 전구체를 500 내지 1000 ℃의 온도로 열처리하여 산화시켜 산화물 전구체를 제조하는 단계; (S2) 리튬 원료물질과 상기 산화물 전구체를 혼합하고 산소 분위기에서 500 내지 800 ℃의 온도로 1차 소성하고 냉각시키는 단계: 및 (S3) 산소 분위기에서 700 내지 900 ℃의 온도로 상기 1차 소성된 결과물을 2차 소성하는 단계를 포함하는, 고함량의 니켈 함유 리튬 복합전이금속 산화물 양극 활물질의 제조방법을 개시한다. 본 발명의 제조방법에 따르면, 수세 공정이 필요 없을 정도로 리튬 불순물 햠량이 저감된 리튬 복합전이금속 산화물 양극 활물질을 제조할 수 있다.