Patent ID: 7655356

Claim:
A non-aqueous electrolyte secondary battery comprising: a positive electrode containing lithium cobalt oxide as a positive electrode active material; a negative electrode containing a conductive agent and molybdenum dioxide as a negative electrode active material; and a non-aqueous electrolyte wherein the mass ratio of the negative electrode active material to the positive electrode active material is within the range of from 0.725 to 0.480; the conductive agent of the negative electrode consists of a carbon material having a lattice constant C 0 along a stacking direction of from 6.7 Åto 6.8 Å, as determined by X-ray diffraction, the carbon material being a mixture of graphitized vapor grown carbon fiber having a ratio (La/Lc) of the crystallite size La along the a-axis to the crystallite size Lc along the c-axis of from 4 to 6 and an artificial graphite having the ratio La/Lc of about 1.