The present invention provides a nonaqueous electrolyte secondary cell having
a positive electrode comprising mainly of a positive electrode active material,
a negative electrode, and a nonaqueous electrolyte. The positive electrode active
material is a lithium-containing transition metal composite oxide of a hexagonal
crystal system that includes a compound represented by the general formula LiCo1-xMxO2,
where M is at least one species selected from the group consisting of V, Cr, Fe,
Mn, Ni, Al, and Ti, and x is a decimal number in a range 0
