Gs Yuasa International Ltd.

Daisuke Yoshikawa

Daisuke Endo

Shinya Otani

Provided is a positive active material for a nonaqueous electrolyte secondary battery which contains a lithium transition metal composite oxide, the lithium transition metal composite oxide having an α-NaFeOstructure, containing Ni, Co and Mn as a transition metal (Me), and having an X-ray diffraction pattern attributable to a space group R3-, in which a ratio of the full width at half maximum of a diffraction peak of the (003) plane to the full width at half maximum of a diffraction peak of the (104) plane, (003)/(104) at a Miller index hkl in X-ray diffraction measurement using a CuKα ray is 0.810 to 0.865, and a crystallite size is 410 Å or more.

Positive active material for nonaqueous electrolyte secondary battery, method for producing positive active material for nonaqueous electrolyte secondary battery, positive electrode for nonaqueous electrolyte secondary battery, nonaqueous electrolyte secondary battery, and energy storage apparatus

Provided is a positive active material for a lithium secondary battery containing a lithium transition metal composite oxide. The lithium transition metal composite oxide has an &#x3b1;-NaFeOstructure. A transition metal (Me) includes Co, Ni and Mn and a molar ratio Li/Me of lithium (Li) to the transition metal is larger than 1.2 and smaller than 1.6. The lithium transition metal composite oxide has a pore volume of 0.055 to 0.08 cc/g in a pore region in which a pore size, at which a differential pore volume determined by a BJH method from an adsorption isotherm using a nitrogen gas adsorption method exhibits a maximum value, is within a range up to 60 nm, and exhibits a single phase belonging to a space group R3-m at 1000&#xb0; C.

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Kyoto, Japan

Daisuke Yoshikawa