Lithium transition metal composite oxide, transition metal hydroxide precursor, method of producing transition metal hydroxide precursor, method of producing lithium transition metal composite oxide, positive electrode active material for non-aqueous electrolyte secondary battery, non-aqueous electrolyte Electrode for secondary battery, non-aqueous electrolyte secondary battery and storage device

摘要

A high density hydroxide precursor, a method of producing a lithium transition metal complex oxide using the precursor, a positive electrode active material having a large discharge capacity per volume using the complex oxide, and a non-aqueous electrolyte An electrode for a secondary battery and a non-aqueous electrolyte secondary battery are provided. A method for producing a transition metal hydroxide precursor used for producing a lithium transition metal composite oxide, comprising: preparing a transition metal in a reaction vessel provided with an aqueous solvent in which a complexing agent and a reducing agent are dissolved in advance. A transition metal containing Mn and Ni, or Mn and Ni, Co and having a molar ratio Mn / Me of greater than 0.5 and a molar ratio of Co / Me of 0.15 or less by adding a solution containing (Me) It is a method of coprecipitating a hydroxide. In addition, it has an α-NaFeO 2 type crystal structure, the molar ratio Li / Me is greater than 1, has the above molar ratio of Mn and Co, and has an X-ray diffraction pattern attributable to R3-m, From the adsorption isotherm using the nitrogen gas adsorption method, the ratio (FWHM (003) / FWHM (104)) of the half width of the diffraction peak of the (003) plane to the half width of the diffraction peak of the 104) plane is 0.72 or less It is a lithium transition metal complex oxide whose peak differential pore volume determined by the BJH method is 0.50 mm 3 / (g · nm) or less. [Selected figure] Figure 1