| 摘要 |
PURPOSE:To form a protective film, not relating with battery electrode reaction, on a positive/negative electrode surface by charging a battery at voltage of specific % rated voltage of the secondary battery within a specific number of days after assembling the battery, and thereafter applying or holding charging voltage for a prescribed time or more under the specific % atmosphere. CONSTITUTION:Powder is prepared by mixing respectively 5wt.% graphite and acetylene back as a conducting agent and 5wt.% PVDF as a binder relating to, for instance, 85 pts.wt. LiCoO2 as a positive electrode active material, to add dimethylforumamide and isophorone to the powder as a solvent. A positive electrode substance thus obtained is applied to an Al late and dried to obtain a positive electrode plate. Next by mixing, for instance, 70wt.% pitch cokes capable of doping/dedoping an Li ion, 10wt.% conduction agent acetylene black and 20wt.% fluorine system binder, solvent dimethylforumamide or the like added to be applied to an Ni plate, to obtain a negative electrode plate. After charging at 98 to 100% rated voltage of a secondary battery within three days after assembly, the plate is preserved for two hours or more under the atmosphere of 30 to 70 deg.C. |
