Patent ID: 7563540

Claim:
A cathode active material of formula (1) below: Li x Co y M 1-y A 2 (1) where 0.95≦x≦1.0; 0≦y≦1; M is at least one selected from the group consisting of Ni, Fe, Pb, Mg, Al, K, Na, Ca, Si, Ti, Sn, V, Ge, Ga, B, As, Zr, Mn, and Cr; and A is one selected from the group consisting of O, F, S, and P, the cathode active material of said formula (1) having, as measured by Raman spectroscopy, a ratio of peak intensities between spinel and hexagonal A 1g vibrational modes in an approximate range of 1:0.1-1:0.4, a ratio of peak intensities between hexagonal A 1g and E g vibrational modes in an approximate range of 1:0.9-1:3.5, and a ratio of peak intensities between spinel A 1g and F 2g vibrational modes in an approximate range of 1:0.2-1:0.4.