TECHNOLOGY FOCUS - ELECTRONICS - Preferred Film: An insulating micro-porous film having ionic permeability is interposed between anode and cathode along with separator. Preferred Properties: The shrinkage percentage of separator when maintaining battery at 150degreesC for 60 minutes is 5% or less. The separator has thickness of 3-30 microns.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Particle: The heat resistant microparticle (B) is non-electrical conductivity inorganic microparticle, organic microparticle having melting point of 160degreesC or more, or cross-linked polymer microparticle. The microparticle (B) is particle of iron oxide, silica, alumina, titania, barium titanate, aluminum nitride, silicon nitride, silicon, diamond, barium sulfate, calcium fluoride, barium fluoride, montmorillonite, polyimide, melamine-type resin, phenol-type resin, cross-linking polymethylmethacrylate, cross-linking polystyrene, cross-linking polydivinyl benzene and/or benzoguanamine formaldehyde condensate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Properties: The inclination with respect to temperature of internal resistance of battery is 1 or more, in internal resistance increasing temperature region. The melting point of organic microparticle (A) is 125degreesC or less. The heat deformation temperature of heat resistant microparticle (B) is 160degreesC or more measured according to JIS-K7191, or does not exist. Preferred Composition: The ratio of heat resistant microparticle (B) is 4-74 mass%. The liquid composition contains binder resin. Preferred Particle: The organic microparticles are polyolefin-type resin. The organic microparticle is polyethylene or ethylene vinyl acetate copolymer containing structural unit (less than 15 mol%) derived from vinyl acetate, and its derivative. The microparticles (A,B) are bound with a binder resin, such as ethylene vinyl acetate copolymer. The ethylene vinyl acetate copolymer contains 15 mol% or more of structural unit derived from vinyl acetate, or ethylene acrylate copolymer.