PARTICLE OF TRANSITION METAL COMPLEX HYDROXIDE, POSITIVE POLE ACTIVE MATERIAL FOR LITHIUM-ION SECONDARY BATTERY, AND LITHIUM-ION SECONDARY BATTERY

• Main Authors: AIDA TAIRA, KATO TOSHIHIRO, SUGANUMA SHINSUKE, TAKAHASHI TATSUYA
• Format: Patent
• Language: English; Japanese
• Published: 28.06.2024
• 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

To provide a positive pole active material which can have a more improved battery property level, or the like.SOLUTION: A particle of a transition metal complex hydroxide including a transition metal and an added element having an unbalanced distribution in the particle includes a secondary particle formed by aggregating of a plurality of primary particles. The secondary particle includes: a center part positioned at a site including a center of the secondary particle and formed by aggregating of a plurality of fine primary particles; and an outer peripheral part positioned on an outside of the center part, larger than the fine primary particles, and formed by aggregating of plate-shaped primary particles. The fine primary particle of the center part contains a higher concentration of the added element therein than the plate-shaped primary particle of the outer peripheral part. The particle of the transition metal complex hydroxide has an average particle diameter of 1 μm or more and 15 μm or less.SELECTED DRAWING: Figure 1 【課題】電池特性をさらに向上できる正極活物質等を提供すること。【解決手段】 遷移金属と、粒子内で分布に偏りを有する添加元素と、を含む遷移金属複合水酸化物の粒子であって、複数の一次粒子が凝集して形成された二次粒子を含み、二次粒子は、二次粒子の中心を含む部位に配置され、かつ、複数の微細一次粒子が凝集して形成された中心部と、中心部の外側に配置され、かつ、微細一次粒子よりも大きく、板状の一次粒子が凝集して形成された外周部と、を備え、外周部の板状の一次粒子内よりも中心部の微細一次粒子内の方が高濃度で添加元素が含有され、平均粒径が１μｍ以上１５μｍ以下である、遷移金属複合水酸化物の粒子。【選択図】図１