LITHIUM POLYMER SECONDARY CELL AND ITS MANUFACTURING METHOD

摘要

A lithium polymer secondary cell manufacturing method for manufacturing a lithium polymer secondary cell having a polymer electrolyte layer of lithium ion-conductive polymer gel between the positive and negative electrodes, comprising a step of preparing a precursor solution containing at least one kind of polymerizable monomer, a lithium salt, nonaqueous organic solvent, and 500-10,000 ppm of photopolymerization initiator initiating a polymerization reaction by ultraviolet irradiation and a step of forming a polymer electrolyte layer of a lithium ion-conductive polymer gel by impregnating a substrate for preparing a polymer electrolyte with the precursor solution and polymerizing the polymerizable monomer by irradiating the polymerizable monomer with ultraviolet radiation with illuminance of over 30 mW/cm2 for 0.1 to 20 seconds. By optimizing the concentration of the photopolymerization initiator and the ultraviolet radiation illuminance, the cell characteristics and productivity of the lithium polymer secondary cell can be improved.