To provide a nonaqueous secondary battery with high charge/discharge capacity and lower cycle deterioration than a battery using the conventional carbonaceous material/metal composite material.
A nonaqueous system secondary battery consists of a positive electrode, a negative electrode, an electrolyte prepared by dissolving an electrolyte salt in a nonaqueous solvent, and a positive active material or a negative active material consists of a metallic material (a), a carbonaceous material (b), and a graphite material (c), the metallic material (a) is obtained by heat treating a compound converted into a material capable of electrochemically storing/releasing lithium after heat treatment, the carbonaceous material (b) has a peak intensity ratio R(=IB/IA) of 0.4 or more when the peak intensity appearing in the range of 1580-1620 cm-1 is represented by IA and the peak intensity appearing in the range of 1350-1370 cm-1 is represented by IB in Raman spectrum using argon ion beams having a wavelength of 5143 , and the graphite material (c) has a peak intensity ratio mentioned above of less than 0.4.
FUSE SUSUMU
ISHIHARA MASAJI
