Battery separator, and battery separator manufacturing method
AssigneeToray Battery Separator Film Co., Ltd.
InventorsNaoki Mizuno, Michihiko Irie, Masanori Nakamura, Ken Shimizu
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Abstract
A battery separator includes a porous membrane A with a thickness of less than 10 μm including a polypropylene resin, and a porous membrane B laminated thereon including a heat resistant resin and inorganic particles or cross-linked polymer particles, wherein the porous membrane A satisfies a specific range of thickness, average pore size, and porosity, and the entire battery separator satisfies a specific range of thickness, peeling strength at the interface between the porous membrane A and the porous membrane B, and difference in air resistance between the entire battery separator and the porous membrane A.
Claims6
A battery separator comprising:
- a porous membrane A comprising a polypropylene resin, and a porous membrane B laminated thereon comprising a heat resistant resin and inorganic particles or cross-linked polymer particles, wherein the porous membrane A satisfies expressions (a) to (c), the battery separator satisfies expressions (d) to (f), and the heat resistant resin comprises a fluororesin:
- t(A)<10 μm (a)
- wherein t (A) is a thickness of the porous membrane A;
- 0.01 μm≦R(A)≦1.0 μm (b)
- wherein R (A) is an average pore size of the porous membrane A;
- 30%≦V(A)≦70% (c)
- wherein V (A) is a porosity of the porous membrane A:
- t(T)≦13 μm (d)
- wherein t (T) is a thickness of the entire battery separator;
- F(A/B)≧1.0 N/25 mm (e)
- wherein F (A/B) is a peeling strength at an interface between the porous membrane A and the porous membrane B;
- and
- 20≦Y−X≦100 (f)
- wherein X is an air resistance (sec/100 cc Air) of the porous membrane A, and
- Y is an air resistance (sec/100 cc Air) of the battery separator.
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Dependencies are inferred from the claim text.