METHOD FOR MANUFACTURING POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM-ION SECONDARY BATTERY

• Main Authors: TOKORO HISATO, TAKANO SHUICHI, NAKABAYASHI TAKASHI
• Format: Patent
• Language: English; Korean
• Published: 22.08.2024
• 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

황산니켈은 육수화물이기 때문에 Ni의 질량%는 약 20 ~ 25%로 부피 비중이 작고, 수송이나 정극재의 제조공정에 있어서 취급하는 부피가 커져 버린다는 과제가 있었다. 금속 니켈분말과, Li를 포함하는 화합물과, Li 및 Ni 이외의 금속 원소 M을 포함하는 화합물을 혼합한 혼합분말을 소성하여 층상 구조의 리튬이온 이차전지용 정극 활물질을 얻는 공정을 포함하고, 상기 리튬이온 이차전지용 정극 활물질에 포함되는 전체 금속 원소에 있어서의 Ni가 원자비로 60% 이상이며, 상기 니켈분말은 적어도 일부 산화되어 있거나, 또는 산화시키는 산화 공정을 갖는 리튬이온 이차전지용 정극 활물질의 제조방법. Because nickel sulphate is a hexahydrate, the mass% of Ni is about 20-25%, which makes the bulk specific density thereof low, and thus, there is a problem in that the volume to be handled in transport and in a step for manufacturing a positive electrode material increases. The present invention provides a method for manufacturing a positive electrode active material for a lithium-ion secondary battery, the method including: a step for firing mixed powder in which metal nickel powder, a compound containing Li, and a compound containing a metal element M other than Li and Ni are mixed to yield a positive electrode active material for a lithium-ion secondary battery, the positive electrode material having a layered structure, wherein the amount of Ni in the total amount of metal elements contained in the positive electrode active material for a lithium-ion secondary battery is equal to or greater than 60% in terms of the atomic ratio, and the nickel powder is at least partially oxidized or a step for oxidizing said powder is included.