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

• Main Authors: YAMAUCHI MITSURU, ITO YASUSHI, KOMUKAI TETSUSHI
• Format: Patent
• Language: English; Japanese
• Published: 12.12.2019
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a positive electrode active material which can achieve both of a high output property and high durability without lowering an energy density and further, a method by which such a positive electrode active material can be manufactured readily in an industrial scale production.SOLUTION: A positive electrode active material for a lithium ion secondary battery comprises a lithium nickel complex oxide. The lithium nickel complex oxide is represented by the general formula, LiNiCoMnSiO(where u, x, y and z satisfy 0.03≤u≤0.10, 0.2≤x≤0.35, 0.2≤y≤0.35, 0.003≤z≤0.010 and 0≤α≤0.15); a diameter of a crystallite determined from a half width of a (003)-plane diffraction peak in X-ray diffraction by Scherrer formula is 120 nm or more and 150 nm or less.SELECTED DRAWING: None 【課題】 エネルギー密度を落とすことなく、高い出力特性と耐久性を両立することのできる正極活物質を提供し、さらに、このような正極活物質を、工業規模の生産において容易に製造することができる方法を提供する。【解決手段】 リチウムニッケル複合酸化物を含むリチウムイオン二次電池用正極活物質であって、前記リチウムニッケル複合酸化物が、一般式：Ｌｉ１＋ｕＮｉ１−ｘ−ｙ−ｚＣｏｘＭｎｙＳｉｚＯ２＋α（ただし、式中のｕ、ｘ、ｙ及びｚは、０.０３≦ｕ≦０．１０、０．２≦ｘ≦０．３５、０．２≦ｙ≦０．３５、０．００３≦ｚ≦０．０１０、０≦α≦０．１５）で表され、Ｘ線回折の（００３）面回折ピークの半価幅からＳｃｈｅｒｒｅｒ式により求められる結晶子径が１２０ｎｍ以上、１５０ｎｍ以下であることを特徴とするリチウムイオン二次電池用正極活物質。【選択図】なし