| 摘要 |
PROBLEM TO BE SOLVED: To minimize the deterioration of charge and discharge capacity or the deterioration of load characteristic in the use of repeated charge and discharge by using a metal foil the surface of which is mechanically polished in such a manner that the surface temperature never exceeds 45 deg.C. SOLUTION: Prior to the application of an electrode active material mixture to a current collector sheet formed of a metal foil, the blasting for spraying powder particle to the current collector surface to mechanically polish it is performed in such a manner that the current collector surface never exceeds 45 deg.C, preferably 40 deg.C. In order to prevent the surface temperature of the metal foil from exceeding 45 deg.C, a feedback method by temperature sensor is employed. Since the adhesion is improved by penetrating the electrode active material mixture into the dimple structure formed on the metal foil surface by the blasting to enhance the adhesion between current collector and electrode active material, the electrode active material can be made hardly peeled from the sheet surface. Thus, the life of the battery can be extended. |
