Importance

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Abstract

Provided is an active material for a nonaqueous electrolyte secondary battery containing a lithium transition metal composite oxide which has a crystal structure of an α-NaFeO₂ type and is represented by a compositional formula Li_1+αMe_1−αO₂ (Me is a transition metal element including Co, Ni and Mn, α>0). In the lithium transition metal composite oxide, a compositional ratio Li/Me of lithium Li to the transition metal element Me is 1.25 to 1.425, and an oxygen positional parameter, determined from crystal structure analysis by Rietveld method at the time of using a space group R3-m as a crystal structure model based on an X-ray diffraction pattern in a state of a discharge end, is 0.262 or less.

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First Claim