Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery comprising:

• a positive electrode;
• a negative electrode;
• a separator interposed between said positive electrode and said negative electrode;
• a non-aqueous electrolyte;
• and a porous insulating film adhered to a surface of at least one selected from the group consisting of said positive electrode and said negative electrode,
• said porous insulating film comprising an inorganic oxide filler and a film binder,
• wherein said inorganic oxide filler comprises polycrystalline particles,
• wherein said polycrystalline particles each comprise a plurality of primary particles that are diffusion-bonded together,
• wherein the amount of said film binder contained in said porous insulating film is not greater than 4 parts by weight per 100 parts by weight of said inorganic oxide filler, and
• wherein 90% cumulative volume pore size D90 in a pore size distribution of said porous insulating film measured by a mercury intrusion porosimeter is not less than 0.15 μm.

A non-aqueous electrolyte secondary battery comprising:

• a positive electrode;
• a negative electrode;
• a separator interposed between said positive electrode and said negative electrode;
• a non-aqueous electrolyte;
• and a porous insulating film adhered to a surface of at least one selected from the group consisting of said positive electrode and said negative electrode,
• said porous insulating film comprising an inorganic oxide filler and a film binder,
• wherein a void capable of retaining said non-aqueous electrolyte is formed on an adhering interface where said porous insulating film adheres to said electrode surface, and
• the amount of said film binder contained in said porous insulating film is not greater than 4 parts by weight per 100 parts by weight of said inorganic oxide filler.