METAL COMPOSITE HYDROXIDE AND ITS MANUFACTURING METHOD, POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY AND ITS MANUFACTURING METHOD, AND LITHIUM ION SECONDARY BATTERY USING THE SAME

• Main Authors: AIDA TAIRA, TAKAHASHI TATSUYA
• Format: Patent
• Language: English; Japanese
• Published: 02.04.2020
• 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 composite hydroxide which constitutes a high output secondary battery and is a precursor of a positive electrode active material having a high tap density.SOLUTION: Provided is a method for manufacturing a metal composite hydroxide 10 that comprises nickel, manganese, tungsten, and optionally cobalt and an element M. The method comprises a first crystallization step of supplying a first raw material aqueous solution containing a metal element and an ammonium ion supply body to a reaction tank to adjust pH of the reaction solution to obtain first metal composite hydroxide particles, and a second crystallization step of supplying a second raw material aqueous solution containing a metal element and tungsten more than the first raw material aqueous solution and an ammonium ion supply body to a reaction solution containing the first metal composite hydroxide particles to adjust pH of the reaction solution to form a tungsten concentration layer 3 on surfaces of the first metal composite hydroxide particles to obtain second metal composite hydroxide particles. The resultant metal composite hydroxide has a tap density of 1.7 g/cmto 1.7 g/cm, and contains secondary particles having a solid structure formed by a plurality of primary particles being aggregated.SELECTED DRAWING: Figure 1 【課題】高出力な二次電池を構成し、高いタップ密度の正極活物質と前駆体である複合水酸化物の提供。【解決手段】ニッケル、マンガン、タングステンと、任意にコバルト、元素Ｍを含む金属複合水酸化物１０の製造方法であり、反応槽に金属元素を含む第１の原料水溶液と、アンモニウムイオン供給体を供給し、反応液のｐＨを調整して第１の金属複合水酸化物粒子を得る第１の晶析工程と、第１の金属複合水酸化物粒子を含む反応液に、金属元素と、第１の原料水溶液よりタングステンを多く含む第２の原料水溶液と、アンモニウムイオン供給体を供給し、反応液のｐＨを調整して第１の金属複合水酸化物粒子の表面にタングステン濃縮層３を形成して、第２の金属複合水酸化物粒子を得る第２の晶析工程を備え、得られる金属複合水酸化物は、タップ密度が１．７ｇ／ｃｍ３以上２．３ｇ／ｃｍ３以下、複数の一次粒子が凝集した中実構造の二次粒子を含む。【選択図】図１