Porous Membrane and Multilayer Porous Membrane
First Claim
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1. A separator for nonaqueous electrolyte batteries comprising:
- a porous membrane comprising a polyolefin resin as a main component; and
a porous layer comprising an inorganic filler and a resin binder, where the porous layer is laminated on at least one surface of the porous membrane;
wherein the porous membrane has an average pore size d=0.035 to 0.060 μ
m, a tortuosity τ
a=1.1 to 1.7, and a number B of pores equal to 100 to 500 pores/μ
m2, andwherein the inorganic filler is present in the porous layer in a proportion of not less than 50% and less than 100% by mass.
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Abstract
A multilayer porous membrane comprising a porous membrane containing a polyolefin resin as a main component; and a porous layer containing an inorganic filler and a resin binder and laminated on at least one surface of the porous membrane; wherein the porous membrane has an average pore size d=0.035 to 0.060 μm, a tortuosity τa=1.1 to 1.7, and the number B of pores=100 to 500 pores/μm2, which are calculated by a gas-liquid method, and the porous membrane has a membrane thickness L=5 to 22 μm.
3 Citations
7 Claims
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1. A separator for nonaqueous electrolyte batteries comprising:
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a porous membrane comprising a polyolefin resin as a main component; and a porous layer comprising an inorganic filler and a resin binder, where the porous layer is laminated on at least one surface of the porous membrane; wherein the porous membrane has an average pore size d=0.035 to 0.060 μ
m, a tortuosity τ
a=1.1 to 1.7, and a number B of pores equal to 100 to 500 pores/μ
m2, andwherein the inorganic filler is present in the porous layer in a proportion of not less than 50% and less than 100% by mass. - View Dependent Claims (2, 3, 4, 5, 6)
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7-14. -14. (canceled)
Specification