POSITIVE ELECTRODE ACTIVE MATERIAL, METHOD FOR PREPARING SAME, AND POSITIVE ELECTRODE AND LITHIUM SECONDARY BATTERY INCLUDING SAME

• Main Authors: CHO, Hyeon Jin, YOO, Tae Gu, JUNG, Hae Jung, JO, Chi Ho, HEO, Jong Wook, JUNG, Wang Mo, HWANG, Jin Tae
• Format: Patent
• Language: English; French; Korean
• Published: 13.07.2023
• 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 pertains to: a positive electrode active material; a method for preparing same; and a positive electrode and a lithium secondary battery including same. The positive electrode active material comprises: a lithium-nickel-based oxide in the form of single particles consisting of a single nodule or quasi-single particles that are composites of at most 30 nodules; and Co-containing coatings in the form of islands formed on portions of the surfaces of the lithium-nickel-based oxide particles, wherein the intensity of the lithium-nickel-based oxide surface in contact with the coating, as measured by electron energy loss spectroscopy at 855.5 eV, is greater than the intensity at 853 eV in an Ni L3-edge spectrum. La présente invention concerne : un matériau actif d'électrode positive ; son procédé de préparation ; et une électrode positive et une batterie secondaire au lithium le comprenant. Le matériau actif d'électrode positive comprend : un oxyde à base de lithium-nickel sous la forme de particules uniques constituées d'un seul nodule ou de particules quasi-uniques qui sont des composites d'au plus 30 nodules ; et des revêtements contenant du Co sous la forme d'îlots formés sur des parties des surfaces des particules d'oxyde à base de lithium-nickel, l'intensité de la surface d'oxyde à base de lithium-nickel en contact avec le revêtement, telle que mesurée par spectroscopie de perte d'énergie d'électrons à 855,5 eV, étant supérieure à l'intensité à 853 eV dans un spectre de bord Ni L3. 본 발명은, 1개의 노듈로 이루어진 단입자 또는 30개 이하의 노듈들의 복합체인 유사-단입자 형태인 리튬 니켈계 산화물; 및 상기 리튬 니켈계 산화물 입자 표면의 일부에 아일랜드 형태로 형성되고, Co를 포함하는 코팅부를 포함하고, 상기 코팅부와 접하는 상기 리튬 니켈계 산화물 표면을 전자 에너지 손실 분광법(Electron Energy Loss Spectroscopy)으로 측정하여 얻어진 Ni L3-edge 스펙트럼에서 855.5eV에서의 강도(intensity)가 853eV에서의 강도(intensity)보다 큰 양극 활물질, 그 제조 방법 및 이를 포함하는 양극 및 리튬 이차전지에 관한 것이다.