METHOD FOR MANUFACTURING POSITIVE ELECTRODE ACTIVE MATERIAL

• Main Authors: PARK HANG AH, LEE KANG HYEON, JO JUNG HO, KIM KYUNG OH, LIM JUNG HO
• Format: Patent
• Language: English; Korean
• Published: 25.01.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention relates to a production method of a positive electrode active material, comprising the steps of: dry-mixing lithium composite transition metal oxide with polyimide precursor particles; and forming a polyimide coating layer having a glass transition temperature, Tg, of 300°C or less on the lithium composite transition metal oxide by heat-treating the mixture, wherein the heat treatment is performed at a temperature equal to or higher than the glass transition temperature, Tg, of the polyimide coating layer and, more specifically, to a production method of a positive electrode active material, capable of improving service life characteristics of the positive electrode active material. 본 발명은 리튬 복합 전이금속 산화물과 폴리이미드 전구체 입자를 건식 혼합하는 단계; 및 상기 혼합물을 열처리하여 상기 리튬 복합 전이금속 산화물 상에 유리전이온도 Tg는 300℃ 이하인 폴리이미드 코팅층을 형성하는 단계를 포함하고, 상기 열처리는 상기 폴리이미드 코팅층의 유리전이온도 Tg 이상의 온도로 수행되는 양극 활물질의 제조방법에 관한 것이다.