TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The battery is bipolar battery. Preferred Process: The bipolar battery is obtained by laminating electrolyte layer alternatively with negative electrode active material layer electrically connected to one side of the surface of multilayer electroconductive film, and positive electrode active material layer electrically connected to other side of the surface of multilayer electroconductive film.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The positive electrode active material contains complex oxide of lithium and transition metal. The negative electrode active material contains complex oxide and/or carbon of lithium and transition metal. The electroconductive particles (1) contain carbon-type electroconductive particles or metallic element. The metallic element is chosen from platinum, gold, silver, copper, nickel, and titanium. The electroconductive material contains insulating plate-shaped inorganic particles having aspect ratio of 5 or more. The content of insulating plate-shaped inorganic particles is 1-200 parts weight with respect to 100 parts weight of polymeric material (1). The electroconductive particles (2) are carbon-type electroconductive particles. Preferred Property: The multilayer conductive film has thickness of 1-100 mu m, and electrical resistance per unit area of thickness direction is less than 10 Omega .cm2.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The polymeric material (1) with alicyclic structure has structural unit derived from cycloolefin in principal chain. The alicyclic structure is condensed-ring structure. The polymeric material (1) is norbornene-type polymer and/or its hydrogenated substance, chosen from ring-opened polymer of norbornene-type monomer, hydrogenated substance of ring-opened polymer of norbornene-type monomer, addition polymer of norbornene-type monomer, and addition copolymer of norbornene-type monomer and vinyl monomer. The polymeric material (2) is chosen from polyimide, polyamidoimide, and polyimide. The weight ratio of electroconductive particles (1) and polymeric material (1) is 1:99-99:1. The weight ratio of electroconductive particles (1) and polymeric material (1) is 50:50-99:1.