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US 10,763,480 B2Granted
Porous separator for secondary batteries and secondary battery using same
AssigneeTokyo Ohka Kogyo Co., Ltd.
InventorTsukasa Sugawara
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Abstract
A porous separator for secondary batteries is formed of a porous film, and has a first layered region having an average pore diameter of 100 nm or more and 500 nm or less, and a second layered region having a larger average pore diameter than the first layered region. The first layered region is positioned in one outermost surface of the porous film. Both the first layered region and the second layered region may be positioned as outermost surfaces of the porous film.
Claims18
A porous separator comprising a porous film, the porous film comprising:
- a first laminar region having an average pore diameter of 100 nm or more and 500 nm or less and a thickness of 0.3 μm or more and 5 μm or less;
- and
- a second laminar region having an average pore diameter larger than the average pore diameter of the first laminar region,
- wherein the first laminar region is positioned as one outermost surface of the porous film;
- wherein pores in the porous film are defined by outer surfaces of removed spherical fine particles;
- and
- wherein the porous film comprises at least one selected from the group consisting of aromatic polyamide, polyimide and polyamideimide.
4 more elements
A porous separator comprising a porous film, the porous film comprising:
- a first laminar region having an average pore diameter of 100 nm or more and 500 nm or less;
- and
- a second laminar region having an average pore diameter larger than the average pore diameter of the first laminar region,
- wherein, for pores in the first laminar region that have apertures on a surface, an average diameter of the apertures is 50 nm to 500 nm;
- wherein, for pores in the second laminar region that have apertures on a surface, an average diameter of the apertures is larger than 250 nm and 1200 nm or less;
- wherein the first laminar region is positioned as one outermost surface of the porous film;
- wherein the pores in the porous film are defined by outer surfaces of removed spherical fine particles;
- and
- wherein the porous film comprises at least one selected from the group consisting of aromatic polyamide, polyimide and polyamideimide.
6 more elements
Dependencies are inferred from the claim text.