POSITIVE ELECTRODE ACTIVE MATERIAL FOR NON-AQUEOUS ELECTROLYTE ELECTRICITY STORAGE ELEMENTS, POSITIVE ELECTRODE FOR NON-AQUEOUS ELECTROLYTE ELECTRICITY STORAGE ELEMENTS, NON-AQUEOUS ELECTROLYTE ELECTRICITY STORAGE ELEMENT, ELECTRICITY STORAGE DEVICE, METHOD FOR USING NON-AQUEOUS ELECTROLYTE ELECTRICITY STORAGE ELEMENT, AND METHOD FOR MANUFACTURING NON-AQUEOUS ELECTROLYTE ELECTRICITY STORAGE ELEMENT

摘要

A positive electrode active material for non-aqueous electrolyte electricity storage elements according to one aspect of the present invention comprises a lithium transition metal composite oxide having an α-NaFeO2 structure and further contains aluminum, in which the lithium transition metal composite oxide contains at least one of nickel and cobalt and also contains manganese, the molar content ratio of manganese in transition metals in the lithium transition metal composite oxide is 0.6 or less, and the oxygen positional parameter of the positive electrode active material is 0.265 to 0.269, inclusive, in which the oxygen positional parameter is determined from a crystal structure analysis by Rietveld method using a space group R3-m in a crystal structure model on the basis of an X-ray diffraction pattern in a charged state at a potential of 4.35 V vs. Li/Li+ without such a charge history that the potential does not reach 4.5 V vs. Li/Li+ or more.