NOVELTY - The nonaqueous-electrolyte secondary battery has anode, cathode, a separator and nonaqueous-electrolyte composition. The nonaqueous-electrolyte secondary battery is provided with exterior component (31) of a film-form or shape of a metal square-shaped can. The anode side polyvinylidene-fluoride content layer and cathode side polyvinylidene-fluoride content layer are arranged in the surface at the side of separator of anode and cathode respectively. A heat resisting material having melting point of 400 degrees C or more is arranged between anode and cathode.    USE - For portable electronic devices such as camcorder, mobile telephone and laptop computer.    ADVANTAGE - The nonaqueous-electrolyte secondary battery is excellent in cycle characteristics and overcharge security.    DETAILED DESCRIPTION - The nonaqueous-electrolyte secondary battery has anode and cathode which dope-dedope lithium electrochemically, a separator between anode and cathode, and nonaqueous-electrolyte composition. The nonaqueous-electrolyte secondary battery is provided with exterior component of a film-form or shape of a metal square-shaped can. The anode side polyvinylidene-fluoride content layer and cathode side polyvinylidene-fluoride content layer are arranged in the surface at the side of separator of anode and cathode respectively. A heat resisting material having melting point of 400 degrees C or more is arranged between anode and cathode. The heat resisting material is alumina and/or aramid resin. The active material of cathode contains tin and/or silicon, preferably lithium metallic compound. The nonaqueous-electrolyte composition contains 4-fluoro-1,3-dioxolane-2-one, propene sultone and lithium bis(oxalate) borate.    DESCRIPTION OF DRAWING(S) - The figure shows the perspective view of the nonaqueous-electrolyte secondary battery. (Drawing includes non-English language text)    Anode lead (11)    Cathode lead (12)    Battery device (20)    Exterior component (31)    Contact film (32)