Lithium composite oxide particle for positive electrode material of lithium secondary battery, and lithium secondary battery positive electrode and lithium secondary battery using the same

A lithium composite oxide particle for use as a positive electrode material of a lithium secondary battery, wherein when measured by mercury intrusion porosimetry, said lithium composite oxide particle meets Condition (A) and at least either Condition (B) or Condition (C), where:

• Condition (A) represents that according to a mercury intrusion curve with increase in pressure from 50 MPa to 150 MPa, the mercury intrusion volume is 0.02 cm3/g or smaller;
• Condition (B) represents that according to the mercury intrusion curve with increase in pressure from 50 MPa to 150 MPa, the mercury intrusion volume is 0.01 cm3/g or larger;
• and
• Condition (C) represents that the average pore radius is between 10 nm and 100 nm inclusive and that the pore-size distribution curve has a main peak whose peak top is at a pore radius of between 0.5 μm and 50 μm inclusive and a sub peak whose peak top is at a pore radius of between 80 nm and 300 nm inclusive.