POSITIVE ELECTRODE ACTIVE MATERIAL AND MANUFACTURING METHOD THEREOF

• Main Authors: KANG DONG RYOUNG, CHOI SANG SOON, KIM WOO HYUN, LEE WOO RAM, KIMRI, PARK HYUN AH
• Format: Patent
• Language: English; Korean
• Published: 18.11.2022
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention relates to: a positive electrode active material which can be used to obtain a lithium secondary battery having excellent initial charge/discharge efficiency, lifespan characteristics, and thermal stability; and a method for producing the same. The positive electrode active material according to the present invention comprises: a core part including a lithium transition metal oxide in which the molar ratio of Ni with respect to the total amount of transition metals is at least 80 mol%; and a shell part of a layered structure formed on an upper part of the core part and including a lithium transition metal oxide in which the molar ratio of Mn with respect to the total amount of transition metals is at least 30 mol%. The positive electrode active material satisfies equation 1, 0.005 <= Thickness of shell part (㎛)/Average particle diameter of positive electrode active material (D_(50)) (㎛) <= 0.15. 본 발명은 초기 충방전 효율, 수명 특성 및 열안정성이 우수한 리튬 이차전지를 구현할 수 있는 양극 활물질 및 이의 제조 방법에 관한 것으로, 본 발명의 양극 활물질은 전체 전이금속 중 Ni의 몰 비율이 80몰% 이상인 리튬 전이금속 산화물을 포함하는 코어부; 및 상기 코어부의 상부에 형성되고, 전체 전이금속 중 Mn의 몰 비율이 30몰% 이상인 리튬 전이금속 산화물을 포함하는 층상 구조의 쉘부;를 포함하며, 하기 식 1을 만족한다. [식 1] JPEGpat00004.jpg1090.