| 摘要 |
PROBLEM TO BE SOLVED: To improve the charge and discharge cycle characteristic while keeping a battery capacity by setting the thermal treatment temperature of an electrode to the melting point of a binder or higher, and using a lithium composite oxide as electrode active material. SOLUTION: In order to prevent the reduction in battery capacity by the increase in electrode thickness, a thermal treatment is performed prior to the pressure molding of the electrode. The thermal treatment temperature is set to a temperature higher than the melting point of a binder having satisfactory flowing property, or a temperature higher than the melting point by 20-50 deg.C in order to provide satisfactory charge and discharge cycle characteristic by uniformly fitting the binder to an electrode active material, a conductive material and a current collector. As the positive electrode active material, a lithium composite oxide is used, and a transition metal oxide containing an alkali metal, an inorganic compound such as transition metal chalcogen, a conjugate polymer such as polyacetylene or polyparaphenylene, a crosslinked polymer having a disulfide bond, thionyl chloride or the like is used. |
