Patent ID: 6998071

Claim:
A cathode active material for a non-aqueous electrolyte secondary cell, having a composition represented by the formula: LiCo (1-x) Mg x O 2 wherein x is 0.001 to 0.15, having an average particle diameter of 1.0 to 20 μm, a BET specific surface area value of 0.1 to 1.6 m 2 /g, a volume resistivity value of 1.0×10 to 1.0×10 6 Ω·cm, an electron conductivity (log (1/Ωcm) of −0.5 to −5.0 and a crystallite size of 400 to 1,200 Å, and having an a-axis length of lattice constant of from 0.090x+2.816 Å to 0.096x+2.821 Å and a c-axis length of lattice constant of 0.460x+14.053 Å to 0.476x+14.063 Å wherein x has the same meaning as defined above.