COPPER FOIL FOR LITHIUM SECONDARY BATTERY ELECTRODE, MANUFACTURING METHOD OF COPPER FOIL, ELECTRODE FOR LITHIUM SECONDARY BATTERY USING COPPER FOIL, AND LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium secondary battery using electrolytic copper foil, increasing battery capacity in the initial charge, having excellent charge/discharge cycle characteristics, and having high performance. SOLUTION: In copper foil used as an electrode material for the lithium secondary battery formed by putting an active material capable of electrochemically or chemically absorbing and releasing lithium on the copper foil which is a current collector, the copper foil is made of a granular crystal, the roughness Rz on the both surfaces of the copper foil is 0.5-3.0μm. The both surfaces of the copper foil is preferably finished so as to have the surface roughness Rz of 0.5-3.0μm. The lithium secondary battery uses the copper foil as the electrode material for a negative current collector. COPYRIGHT: (C)2006,JPO&NCIPI