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NONAQUEOUS ELECTROLYTE SECONDARY BATTERY SEPARATOR, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY LAMINATED SEPARATOR, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY MEMBER, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND METHOD FOR PRODUCING NONAQUEOUS ELECTROLYTE SECONDARY BATTERY SEPARATOR

  • US 20170155113A1
  • Filed: 11/29/2016
  • Published: 06/01/2017
  • Est. Priority Date: 11/30/2015
  • Status: Abandoned Application
First Claim
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1. A nonaqueous electrolyte secondary battery separator comprising a porous film containing polyolefin as a main component,the polyolefin being polyethylene,the porous film containing no other polyolefins,the nonaqueous electrolyte secondary battery separator having a parameter X of not more than 20, the parameter X being calculated based on the following equation:


  • X=100×

    |MD
    tan δ



    TD tan δ

    |/{(MD tan δ

    +TD tan δ

    )/2}where MD tan δ

    is tan δ

    in a machine direction of the porous film and TD tan δ

    is tan δ

    in a transverse direction of the porous film,MD tan δ and

    TD tan δ

    each being obtained fay viscoelasticity measurement carried out with respect to the porous film at a frequency of 10 Hz and a temperature of 90°

    C.

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