Patent ID: 7273681

Claim:
A non-aqueous secondary battery, comprising: a positive electrode, a negative electrode, and an electrolytic solution, which is charged or discharged by repeating a reaction of intercalating and deintercalating ions at said positive electrode and said negative electrode, respectively, wherein said negative electrode comprises graphite powder which has a particle size equal to or smaller than 100 μm and which has an intensity ratio (P 2 /P 1 ) equal to or less than 0.92, wherein P 1 is a diffraction peak of hexagonal crystal structure which appears in a range of the diffraction angle from 41.7 degrees to less than 42.7 degrees and P 2 is a diffraction peak of rhombohedral crystal structure which appears in a range of the diffraction angle from 42.7 degrees to 43.7 degrees in a X-ray diffraction pattern with the CuKα line.