| 摘要 |
PROBLEM TO BE SOLVED: To enhance initial Coulomb efficiency, discharge capacity, and a charge and discharge cycle life by reforming the surface of a negative electrode, provided together with a chargeable and dischargeable positive electrode containing lithium ions and polymer electrolyte, and made of a carbon material which stores and discharges the lithium ions through plasma processing. SOLUTION: A transition metal oxide, a composite oxide of the same and lithium, a transition metal sulfide, or a conductive polymer such as polyaniline is used for a positive electrode. After cleaning or the formation of a graft active point such as a radical or the like of the surface of graphite, coke, or the like by an Ar plasma, a monomer or the like, imparting the conductivity of both ions and electrons is introduced and is grafting polymerized on the surface to be a negative electrode material. Normally, a polymer electrolyte containing electrolyte in a gel-like polymer is used. Since no carbon material is allowed to dissolve directly in the electrolyte, the decomposition of the electrolyte is suppressed on the surface thereof, and the intercalation of only the lithium ions is conducted smoothly by cutting the electrolyte. |
