TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Powder: The non-electroconductive powder is inorganic oxide chosen from alumina, titania and silica, and having particle diameter of 1 mum or less. The non-electroconductive powder provides electronic insulation to the adhesive agent.    TECHNOLOGY FOCUS - POLYMERS - Preferred Resin: The adhesive resin has vinylidene fluoride structure in molecular structure. Preferably the adhesive resin is copolymer of vinylidene fluoride and hexafluoropropylene, or mixture of resin which has vinylidene fluoride structure in molecular structure and resin which has cyano group in molecular structure. Preferred Layer: The adhesive resin layer has thickness of 4 mum or less.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Dispersant: The dispersant has fluorine atom, ethylene oxide unit in the molecular structure, and double bond between carbon atoms in molecular structure. The dispersant has formula (1 or 2). SPECIFIC COMPOUNDS - The solvent is N-methyl-2-pyrrolidone or N,N'-dimethyl formamide.    EXAMPLE - alpha-perfluoro nonenyl oxy-(omega)-methyl polyethylene oxide (in weight parts) (0.13) was dissolved in N-methyl pyrrolidone (12.6). Aerosil alumina powder having particle diameter of 16 nm as non-electroconductive powder (1.25) was added to the solution and mixed. N-methyl pyrrolidone solution (20.5) of poly (vinylidene fluoride-hexafluoropropylene) copolymer was added as adhesive resin and mixed and an adhesive agent was prepared. The adhesive agent was applied on a separator film surface. Negative electrode active material layer surface of negative electrode was bonded to adhesive agent coated surface of separator film and dried at 80degreesC. The adhesive resin layer had thickness of 1.5 mum. The bonding strength of negative electrode and separator film was 25 gf/cm. The adhesive agent was applied on positive electrode active material surface of positive electrode. The film surface of the separator adhered to negative electrode was bonded to adhesive agent coated surface of positive electrode active material layer and dried at 80degreesC after removing solvent, and battery element was produced. A battery was produced using the battery element. The cycle property of battery was evaluated, and was found that battery maintained 94% of initial stage capacitance after 500 cycles.