POSITIVE ELECTRODE MATERIAL FOR LITHIUM SECONDARY BATTERY POSITIVE ELECTRODE AND SECONDARY BATTERY

• Main Authors: KANG DONG RYOUNG, KIM JAE GEUN, LEE WOO RAM, EOM JUN HO, PARKRI
• Format: Patent
• Language: English; Korean
• Published: 28.09.2021
• 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 cathode material, which includes: a first cathode active material, which is composed of large-particle diameter particles having a large average particle diameter; and a second cathode active material, which is composed of small-particle diameter particles having a small average particle diameter, wherein the first cathode active material and the second cathode active material are each independently a lithium transition metal oxide in which the molar ratio of nickel among transition metals is 80 mol% or more, and satisfy the formula (1). Formula (1): 0 <{(B-A)/B}× 100 <= 10. In formula (1), A is a particle strength value of the first cathode active material, and B refers to a particle strength value of the second cathode active material. Accordingly, life characteristics can be further improved. 본 발명은 평균 입경이 큰 대입경 입자인 제1 양극 활물질 및 평균 입경이 작은 소입경 입자인 제2 양극 활물질을 포함하며, 상기 제1 양극 활물질 및 상기 제2 양극 활물질은 각각 독립적으로 전이금속 중 니켈의 몰 비율이 80몰% 이상인 리튬 전이금속 산화물이고, 하기 식 (1)을 만족하는 양극재에 관한 것이다. 식 (1): 0 <{(B-A)/B}× 100 ≤ 10 상기 식 (1)에서, 상기 A는 제1 양극 활물질의 입자 강도 값이고, 상기 B는 제2 양극 활물질의 입자 강도 값을 의미한다.