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Title:
POROUS FILM, SEPARATOR FOR SECONDARY BATTERIES, AND SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2018/155288
Kind Code:
A1
Abstract:
[Problem] The purpose of the present invention is to provide a separator for secondary batteries, which has high heat resistance, excellent battery characteristics and excellent quality stability, at low cost. [Solution] A porous film which has a porous layer containing inorganic particles and a heat-resistant resin on at least one surface of a porous substrate, and wherein the heat-resistant resin is (A) a resin that has a melting point of 200°C or higher or (B) a resin that has no melting point. This porous film has an area thermal shrinkage of 25% or less at 140°C, while having a variation in light transmittance at a wavelength of 800 nm of 15% or less in the length direction as measured at intervals of 5 m.

Inventors:
IKOMA KEI (JP)
KAI NOBUYASU (JP)
TSUKUDA AKIMITSU (JP)
Application Number:
PCT/JP2018/005160
Publication Date:
August 30, 2018
Filing Date:
February 15, 2018
Export Citation:
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Assignee:
TORAY INDUSTRIES (JP)
International Classes:
B32B3/10; B32B27/20; B32B27/32; H01M10/058; H01M50/449; H01M50/489; H01M50/403; H01M50/491
Domestic Patent References:
WO2016017440A12016-02-04
WO2010021248A12010-02-25
WO2007052663A12007-05-10
Foreign References:
JP2016139489A2016-08-04
JP2004074301A2004-03-11
JP5183435B22013-04-17
JP2016130027A2016-07-21
Other References:
See also references of EP 3588611A4
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