MANUFACTURE OF NONAQUEOUS ELECTROLYTE BATTERY

摘要

PURPOSE:To secure formation of a protective film on the surface of lithium so as to improve the preservation performance and reduce variation in the preservation performance of a lithium battery by leaving the lithium to stand in an atmosphere of carbon dioxide gas before the lithium is incorporated in the battery. CONSTITUTION:Lithium is left to stand in an atmosphere containing carbon dioxide gas prior to being incorporated in a battery. For instance, in the first process of making a negative electrode, ingot-like lithium is formed into a long ribbon-like shape of 0.25mm. thickness and 20mm. width in dry air of below 4% relative humidity by extrusion molding while the ribbon-like lithium is wound in hoop-like form which is then sealed and stored in a metallic can charged with argon. Next the ribbon-like lithium is punched into disks of 14mm. diameter and 0.25mm. thickness in dry air. Then the thus obtained disk-like lithium 3 is pressed and integrated with a negative current collector net 2 welded to the inner surface of a sealing plate 1. Next this is left to stand in an atmosphere of carbon dioxide gas for a given time before being combined with other parts. After that electrolyte is poured in the battery before it is sealed.