TRANSITION METAL COMPOSITE HYDROXIDE CAPABLE OF SERVING AS PRECURSOR OF POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, METHOD FOR PRODUCING SAME, POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, METHOD FOR PRODUCING POSITIVE ELECTRODE ACTIVE MATERIAL, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING POSITIVE ELECTRODE ACTIVE MATERIAL

摘要

A transition metal composite hydroxide can be used as a precursor to allow a lithium transition metal composite oxide having a small and highly uniform particle diameter to be obtained. A method also is provided for producing a transition metal composite hydroxide represented by a general formula (1) MxWsAt(OH)2+α, coated with a compound containing the additive element, and serving as a precursor of a positive electrode active material for nonaqueous electrolyte secondary batteries. The method includes producing a composite hydroxide particle, forming nuclei, growing a formed nucleus; and forming a coating material containing a metal oxide or hydroxide on the surfaces of composite hydroxide particles obtained through the upstream step.

主权项

1. A transition metal composite hydroxide represented by a general formula (1) MxWsAt(OH)2+α (wherein, x+s+t=1, 0 the transition metal composite hydroxide is a secondary particle having a substantially spherical shape and composed of aggregation of a plurality of primary particles, the secondary particle has an average particle diameter of 3 to 7 μm and an index indicating a scale of particle-size distribution, [(d90−d10)/average-particle-diameter], of not more than 0.55, and a coating material containing a metal oxide of tungsten and the additive element or a metal hydroxide of tungsten and the additive element is formed on surfaces of the secondary particles.