Patent ID: 7838150

Claim:
A nonaqueous lithium secondary battery comprising a positive electrode, a negative electrode, and a nonaqueous electrolyte, wherein: 1) the positive electrode comprises a porous carbonaceous material whose BET specific surface area is at least 500 m 2 /g, or a mixture of a porous carbonaceous material whose BET specific surface area is at least 500 m 2 /g and a material capable of electrochemically occluding and releasing lithium; and 2) the negative electrode comprises a carbonaceous material whose BET specific surface area is 50 to 1000 m 2 /g, the carbonaceous material comprising a cover layer on the surface of a nuclear carbon particle, the cover layer comprising an amorphous carbonaceous material, the nuclear carbon particle comprising activated carbon having a pore structure and with a BET specific surface area of at least 100 m 2 /g, an amount of the amorphous carbonaceous material being 10 to 80% with respect to the activated carbon weight, the carbonaceous material being obtained by subjecting the nuclear carbon particle to a heat treatment in an inert atmosphere containing a hydrocarbon gas capable of forming a cover layer by heat treatment in a vapor phase.