Positive electrode active material sintered body for battery

A positive electrode active material sintered body for a battery satisfying the following requirements (I) to (VII):

• (I) fine particles in a positive electrode active material and carbon particles are sintered to constitute the sintered body;
• (II) a peak pore diameter which provides a maximum differential pore volume value in a pore diameter range of 0.01 to 10 μm in a pore distribution measured by a mercury porosimeter is 0.3 to 5 μm;
• (III) a total pore volume measured by the mercury porosimeter is 0.1 to 1 cc/g;
• (IV) an average particle diameter in laser diffraction/scattering particle diameter distribution measurement is not less than the peak pore diameter and not more than 5 μm;
• (V) a peak, which provides a differential pore volume value of 10% or more of the maximum differential pore volume value and has a smaller pore diameter than the peak pore diameter in the pore distribution measured by the mercury porosimeter, is not present;
• (VI) a BET specific surface area is 2 to 6 m2/g;
• and
• (VII) a full width at half maximum of a strongest X-ray diffraction peak of the positive electrode active material sintered body is 0.13 to 0.2.