| abstract |
Provided is a positive electrode active material useful for a lithium secondary battery exhibiting a battery resistance lower than that of the prior art under a freezing point. A positive electrode active material for lithium secondary batteries containing at least one element composed of the group consisting of nickel, cobalt and manganese and having a layered structure, the positive electrode active material for lithium secondary batteries satisfying all of the following requirements (1) to (3). : (1) A primary particle diameter of 0.1 to 1 μm, a secondary particle diameter of 1 to 10 μm (2) In powder X-ray diffraction measurement using CuKα ray, The crystallite size at the peak within the range of 2θ = 18.7±1° is 100 to 1200 Å, and the crystallite size at the peak within the range of 2θ = 44.6±1° is 100 to 700 Å (3) In the pore distribution obtained by the mercury intrusion method, The pore diameter has a pore peak in the range of 10 to 200 nm, Moreover, the pore volume in the range is 0.01-0.05 cm<3>/g |