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Porous Membrane and Multilayer Porous Membrane

  • US 20170194612A1
  • Filed: 03/17/2017
  • Published: 07/06/2017
  • Est. Priority Date: 03/28/2012
  • Status: Active Grant
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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