Separator for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery
AssigneePanasonic Energy Co., Ltd.
InventorNobuhiro Sakitani
Life of this patent
Estimating the term…
Abstract
A separator for nonaqueous electrolyte secondary batteries according to one embodiment of the present disclosure comprises a porous base material and a heat-resistant porous film that is arranged on at least one surface of the porous base material so as to face an electrode of a nonaqueous electrolyte secondary battery. The heat-resistant porous film contains a filler and a binder; and at least a part of a facing part A of the heat-resistant porous film, said facing part A facing the edge portion of the electrode, has a higher binder content than a facing part B of the heat-resistant porous film, said facing part B facing the central portion of the electrode.
Claims4
A separator for a non-aqueous electrolyte secondary battery comprising:
- a porous substrate;
- and
- a heat-resistant porous film that is disposed on at least one surface of the porous substrate so as to face an electrode of a non-aqueous electrolyte secondary battery,
- wherein the heat-resistant porous film contains a filler and a binder, and
- a content of the binder in
- at least one part of facing parts A of the heat-resistant porous film facing an edge portion of the electrode in a lateral direction, the edge portion located more inwardly than an end of the heat-resistant porous film in the lateral direction, and
- at least one part of a facing part B of the heat-resistant porous film facing an edge portion of the electrode in a longitudinal direction, the edge portion located more inwardly than an end of the heat-resistant porous film in the longitudinal direction,
- is higher than that in a facing part C of the heat-resistant porous film facing a central portion of the electrode.
Dependencies are inferred from the claim text.