Non-aqueous electrolyte secondary battery and manufacturing methods of an electrode used therein

Abstract

To provide a non-aqueous electrolyte secondary battery adapted to prevent an internal short circuit between an positive electrode and a negative electrode caused by the penetration of electrically conductive micro particles through a separator, which occurs when winding up electrodes, and manufacturing methods of an electrode used therein, whereby the non-aqueous electrolyte secondary battery having a coiled electrode assembly is formed through the multilayer winding of an positive electrodehaving a metallic collectorcoated with an positive electrode mixturecomposed of an positive electrode active material that occludes and liberates lithium ions, a negative electrodehaving a metallic collectorcoated with a negative electrode mixture, composed of a negative electrode active material that occludes and liberates lithium ions, and a separatorinterposed between the positive electrode and the negative electrode, wherein the positive electrodehas an insulating layerformed by means of the dried coating method, the heat seal tape method, or the hot melt coating method on a portion of the metallic collectorwhich is uncoated with the positive electrode mixtureand opposed to the negative electrodecoated with the negative electrode mixture, through the separator