Porous layer
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United States of America Patent
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Jan 23, 2018
Issued Date -
N/A
app pub date -
Jan 4, 2017
filing date -
Mar 11, 2016
priority date (Note) -
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Abstract
As a nonaqueous electrolyte secondary battery porous layer having an excellent cycle characteristic, provided is a nonaqueous electrolyte secondary battery porous layer containing: an inorganic filler; and a polyvinylidene fluoride-based resin, the nonaqueous electrolyte secondary battery porous layer containing the inorganic filler in an amount of not less than 50% by weight relative to a total weight of the inorganic filler and the polyvinylidene fluoride-based resin, the polyvinylidene fluoride-based resin containing an α-form polyvinylidene fluoride-based resin and a β-form polyvinylidene fluoride-based resin, assuming that a sum of (i) an amount of the α-form polyvinylidene fluoride-based resin and (ii) an amount of the β-form polyvinylidene fluoride-based resin is 100 mol %, the amount of the α-form polyvinylidene fluoride-based resin being not less than 45 mol %.
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