SEPARATOR FOR BATTERIES - TORAY INDUSTRIES

Title:

SEPARATOR FOR BATTERIES

Document Type and Number:

WIPO Patent Application WO/2021/181815

Kind Code:

A1

Abstract:

[Problem] The purpose of the present invention is to provide a separator for batteries, said separator having low air resistance, low electrical resistance, good high-output characteristics and low moisture content ratio, while being suppressed in gas generation. [Solution] The present invention relates to a separator for batteries, said separator comprising a polyolefin porous membrane and a heat-resistant porous layer that is provided on at least one surface of the porous membrane. This separator for batteries is characterized in that: the heat-resistant porous layer contains barium sulfate particles and an organic synthetic resin component; the amount of particles having a particle diameter of 0.5 μm or less is 20% by volume or less; the amount of particles having a particle diameter of 3.0 μm or more is 10% by volume or less; the barium sulfate particles are contained in the heat-resistant porous layer in an amount of from 70% by volume to 98% by volume if the total of the barium sulfate particles and the organic synthetic resin component is taken as 100% by volume; the average thickness of the heat-resistant porous layer is from 2 μm to 10 μm; the moisture ratio of the separator is 400 ppm or less; and the content of hydrogen sulfide is 0.2 × 10-3 mg/m2 or less.

Inventors:

NINOMIYA HIROKAZU (JP)
ECHIZEN KENJI (JP)
FURUYAMA KAHO (JP)

Application Number:

PCT/JP2020/047877

Publication Date:

September 16, 2021

Filing Date:

December 22, 2020

Export Citation:

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Assignee:

TORAY INDUSTRIES (JP)

International Classes:

H01M50/409

Domestic Patent References:

WO2014007390A1

2014-01-09

Foreign References:

JP2015162313A	2015-09-07
JPS6337512B2	1988-07-26
JP5898405B2	2016-04-06
JPH0226359B2	1990-06-08
JPS6115602B2	1986-04-25