Patent ID: 7575606

Claim:
A method for producing lithium ion secondary batteries, comprising the steps of: (A) preparing an electrode sheet with lead-forming parts, (B) intermittently forming porous insulating layers comprising an inorganic oxide filler and a binder on a surface of said electrode sheet excluding said lead-forming parts, (C) connecting a lead to each of said lead-forming parts, and (D) fabricating batteries by using the electrode sheet to which said leads are connected, wherein said step B comprises: a step of applying a slurry comprising the inorganic oxide filler and the binder to the outer surface of a gravure roll, and transferring the slurry applied to the outer surface of said gravure roll onto a surface of said electrode sheet that is being transported by a plurality of guide rolls, excluding said lead-forming parts; and a step of moving at least one selected from said gravure roll and said guide rolls to move said electrode sheet away from said gravure roll at said lead-forming parts, wherein said gravure roll is disposed between said plurality of guide rolls.