POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, MANUFACTURING METHOD THEREOF, AND LITHIUM SECONDARY BATTERY INCLUDING THE SAME

• Main Authors: YANG A REUM, CHOI MOON HO, KANG JU KYOUNG, HEO GYEONG JAE, CHOI SEUNG HYUN
• Format: Patent
• Language: English; Japanese
• Published: 30.04.2021
• 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

To provide a positive electrode active material for a secondary battery in which the packing density and energy density are improved and the specific surface area of particles is reduced.SOLUTION: In a positive electrode active material including overlithiated layered oxide (OLO), in the OLO, the primary particles aggregate to form secondary particles, and the primary particles having a size of 300 nm to 10 μm are 50 to 100 volume % of all the primary particles constituting the secondary particles.SELECTED DRAWING: Figure 1 【課題】充填密度、エネルギー密度が改善され、粒子の比表面積を減少させる二次電池用正極活物質の提供。【解決手段】リチウム過剰層状酸化物（ｏｖｅｒｌｉｔｈｉａｔｅｄ ｌａｙｅｒｅｄ ｏｘｉｄｅ：ＯＬＯ）を含む正極活物質であって、前記リチウム過剰層状酸化物は、一次粒子が凝集して二次粒子を形成し、３００ｎｍ〜１０μｍの大きさを有する一次粒子が、前記二次粒子を構成する全一次粒子中の５０〜１００体積％である、二次電池用正極活物質。【選択図】図１