Patent ID: 7399552

Claim:
A battery, comprising: a cathode; an anode; and an electrolyte, wherein the capacity of the anode includes a capacity component by insertion and extraction of light metal and a capacity component by precipitation and dissolution of the light metal, and is represented by the sum of them, and the anode includes a dual-layer carbon material obtaining a first peak within a range from 1580 cm −1 to 1620 cm −1 and a second peak within a range of 1350 cm −1 to 1370 cm −1 in a Raman spectrum analysis using argon laser light with a wavelength of 5145 nm, and the dual-layer carbon material having an average intensity ratio IB/IA between the first peak and the second peak of 0.25 to 0.6, where the intensity of the first peak is IA and the intensity of the second peak is IB, wherein one of the dual-layer carbon layers includes a high crystalline layer with an intensity ratio IB/IA of less than 0.25 and another of the dual-layer carbon layers includes a low crystalline layer with an intensity ratio IB/IA of 0.25 or more.