| 摘要 |
PURPOSE:To provide a battery having the large charging-discharging capacity and less deterioration of charge efficiency by providing a negative electrode of the multilayer structure having a carbonic substance, as a principal component having the respective specific values of an H/C atomic ratio, spacing and a fixed value on the basis of a Raman spectrum analysis, and a specific electrolyte. CONSTITUTION:A negative electrode is of a multilayer structure having carbon of a high graphitization degree as an inner nucleus 2, carbon of a low graphitization degree of its surface as an outer nucleus 1 and the like, and has a carbonic material as a principal component which has an H/C atomic ratio 0.08 or less, spacing of the (0.02) surface according to X-ray wide angle diffraction which has two peaks of 3.35 to 3.43Angstrom and 3.43Angstrom or more, and a G-value 0.4 or more shown in an expression at the time of a Raman spectrum analysis using an argon laser beam of a wavelength 5145Angstrom . On the other hand, the electrolyte is made by dissolving an electrolytic salt in a mixed solvent containing a cyclic ester compound and an ether compound or a chain ester compound. A secondary battery having the large charging and discharging capacity and of which the charge efficiency lowering due to the use in a continuous cycle is little can be obtained by using these negative electrode and electrolyte. |
