POSITIVE ELECTRODE ACTIVE MATERIAL, AND LITHIUM SECONDARY BATTERY COMPRISING SAME

• Main Authors: SHIN, Ji Hyun, CHOI, Su An, LIM, Sun Hye, WOO, Joo Hyeong, AN, Ji Sun, JEON, Sang Hoon
• Format: Patent
• Language: English; French; Korean
• Published: 13.12.2018
• 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 positive electrode active material and to a lithium secondary battery including same. Provided is a positive electrode active material represented by Chemical Formula 1 below, wherein the I003/I104 ratio is at least 1.6, the R-factor value represented by Mathematical Formula 1 is 0.40 to 0.44, and the c-axis lattice constant (c) and a-axis lattice constant (a) satisfy 3(a)+5.555 ≤ (c) ≤ 3(a)+5.580. [Mathematical Formula 1] R-factor = (I102 + I006) / (I101) I003, I006, I101, I102, and I104 are the intensities of the diffraction peaks of the (003), (006), (101), (102), and (104) planes obtained by x-ray diffraction analysis using CuK á radiation; [Chemical Formula 1] Liá[(NixCoy)1-βAβ]Oz (where 0.95 ≤ α ≤ 1.1, 0.75 ≤ x ≤ 0.95, 0.03 ≤ y ≤ 0.25, 0 < β ≤ 0.2, and 1.9 ≤ z ≤ 2.1, A is a dopant metal element, and the average oxidation number N of A satisfies 3.05 ≤ N ≤ 3.35. La présente invention concerne un matériau actif d'électrode positive et une batterie secondaire au lithium le comportant. L'invention concerne un matériau actif d'électrode positive représenté par la formule chimique 1 ci-dessous, le rapport I003 / I104 étant d'au moins 1,6, la valeur de facteur R représentée par la formule mathématique 1 étant de 0,40 à 0,44, et la constante de réseau d'axe c (c) et la constante de réseau d'axe c (a) satisfaisant 3 (a) + 5,555 ≤ (c) ≤ 3 (a) + 5,580. [Formule mathématique 1] R - facteur = (I102 + I006) / (I101) I003, I006, I101, I102, et I104 sont les intensités des pics de diffraction des plans (003), (006), (101), (102), et (104) obtenus par analyse de diffraction des rayons x à l'aide d'un rayonnement CuK; [formule chimique 1] Liá[(Ni x Coy)1 - βAβ]Oz (où 0,95 ≤ α ≤ 1,1, 0,75 ≤ x ≤ 0,95, 0,03 ≤ y ≤ 0,25, 0 < β ≤ 0.2, et 1,9 ≤ z ≤ 2,1, A est un élément métallique dopant, et le nombre moyen d'oxydations N de A satisfait 3,05 ≤ N ≤ 3,35). 양극 활물질, 및 이를 포함하는 리튬 이차 전지에 대한 것으로, 하기 화학식 1로 표시되고, I003/I104 비율이 1.6이상이고, 하기 수학식 1로 표시되는 R-factor 값은 0.40 내지 0.44이고, c축격자정수 (c)과 a축격자정수 (a)는 3(a)+5.555 ≤ (c) ≤ 3(a)+5.580를 만족하는 것인 양극 활물질을 제공한다. [수학식 1] R-factor = (I102 + I006) / (I101) I003, I006, I101, I102, 및 I104는 CuK α선을 이용한 X선 회절분석에 의한 (003), (006), (101), (102), 및 (104)면의 회절 피크의 강도이고, [화학식 1] Liα[(NixCoy)1-βAβ]Oz 상기 화학식 1에서, 0.95 ≤ α ≤ 1.1, 0.75 ≤ x ≤ 0.95, 0.03 ≤ y ≤ 0.25, 0 < β ≤ 0.2, 및, 1.9 ≤ z ≤ 2.1이고, Α는 도펀트 금속 원소이며, A의 평균 산화수 N은 3.05 ≤ N ≤ 3.35 이다.