Patent ID: 7229716

Claim:
A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode comprising a graphite as a negative electrode active material, and a nonaqueous electrolyte comprising at least a saturated cyclic carbonic ester and containing a cyclic carbonic ester having a carbon-carbon double bond such that, when a content of the cyclic carbonic ester having a carbon-carbon double bond is x (g), a content of the graphite in the negative electrode is B (g), a specific surface area of the graphite is A (m 2 /g), a size of the crystallite of the graphite in a direction of the c axis is Lc, and a size of the crystallite of the graphite in a direction of the a axis is La, a condition expressed by 0.05×10 −2 ≦x/[A×B× 2 Lc /(2 Lc+La )]≦3×10 −2 is satisfied.