U.S. Patent No. 6,811,923 - Active Material For Anode Of Secondary Cell And Method For Production Thereof And Non-Aqueous Electrolyte Secondary Cell, And Recycled Electronic Functional Material And Method For Recycling Electronic Functional Material (Nov.

Positive electrode active material for nonaqueous electrolytic solution secondary batteries is made of a metal oxide. A content of coarse particles, of which particles sizes are 600% or more with respect to an average particle size of the metal oxide, is 1% or less by volume, and a content of high density particles, of which densities are 150% or more with respect to an average density of the metal oxide, is 1000 ppm or less. By using the positive electrode active material, battery characteristics and a manufacturing yield may be improved.