LITHIUM-TRANSITION-METAL COMPOSITE OXIDE, TRANSITION METAL HYDROXIDE PRECURSOR, METHOD FOR MANUFACTURING TRANSITION METAL HYDROXIDE PRECURSOR, METHOD FOR MANUFACTURING LITHIUM-TRANSITION-METAL COMPOSITE OXIDE, POSITIVE-ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS-ELECTROLYTE SECONDARY CELL, ELECTRODE FOR NONAQUEOUS-ELECTROLYTE SECONDARY CELL, NONAQUEOUS-ELECTROLYTE SECONDARY CELL, AND POWER STORAGE DEVICE

摘要

To provide a hydroxide precursor having a high density, a method for producing a lithium transition metal composite oxide using the precursor, a positive active material having a large discharge capacity per unit volume, which uses the composite oxide, an electrode for nonaqueous electrolyte secondary battery, and a nonaqueous electrolyte secondary battery. A method for producing a transition metal hydroxide precursor for use in production of a lithium transition metal composite oxide, including adding a solution containing a transition metal (Me) into a reaction tank in which a water solvent of dissolution of a complexing agent and a reducing agent has been charged in advance to coprecipitate a transition metal hydroxide that includes Mn and Ni, or Mn, Ni and Co, and has a mole ratio Mn/Me of larger than 0.5 and a mole ratio Co/Me of 0.15 or less. Further, a lithium transition metal composite oxide having an ±-NaFeO 2 -type crystal structure, in which a mole ratio Li/Me is larger than 1, the mole ratios of Mn and Co are as described above, and which has an X-ray diffraction pattern attributable to R3-m, a ratio (FWHM (003)/FWHM (114)) of a full width at half maximum of a diffraction peak of a (003) plane to a full width at half maximum of a diffraction peak of a (104) plane of 0.72 or less, and a peak differential pore volume of 0.50 mm 3 /(g·nm) or less as determined by a BJH method from an adsorption isotherm using a nitrogen gas adsorption method.