SEPARATOR FOR NONAQUEOUS SECONDARY BATTERY, PROCESS FOR PRODUCING THE SAME, AND NONAQUEOUS SECONDARY BATTERY

Title:

SEPARATOR FOR NONAQUEOUS SECONDARY BATTERY, PROCESS FOR PRODUCING THE SAME, AND NONAQUEOUS SECONDARY BATTERY

Document Type and Number:

WIPO Patent Application WO/2008/062727

Kind Code:

A1

Abstract:

A separator which comprises a microporous polyethylene film and a heat-resistant porous layer. It has a sufficient shutdown function and heat resistance and can have a reduced thickness. It is effective in mitigating a problem concerning slipping properties. The separator for nonaqueous secondary batteries comprises a microporous film consisting mainly of polyethylene and a heat-resistant porous layer consisting mainly of a heat-resistant polymer and formed on at least one surface of the microporous film. It is characterized in that (1) the microporous film has a Gurley value of 25-35 sec/100 cc•µm per unit thickness, (2) the heat-resistant porous layer contains fine inorganic particles having an average particle diameter of 0.1-1.0 µm, (3) the fine inorganic particles account for 40-80% by volume of the sum of the heat-resistant polymer and the fine inorganic particles, and (4) the heat-resistant porous layer has a total thickness of 3-12 µm.

Inventors:

NISHIKAWA SATOSHI (JP)

Application Number:

PCT/JP2007/072279

Publication Date:

May 29, 2008

Filing Date:

November 16, 2007

Export Citation:

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Assignee:

TEIJIN LTD (JP)
NISHIKAWA SATOSHI (JP)

International Classes:

H01M50/403; H01M50/414; H01M50/431; H01M50/449; H01M50/457; H01M50/489; H01M50/491

Domestic Patent References:

WO2001019906A1

2001-03-22

Foreign References:

JP2005285385A	2005-10-13
JP2001023600A	2001-01-26
JP2006032246A	2006-02-02
JP2007125821A	2007-05-24
JP2002355938A	2002-12-10
JP2005209570A	2005-08-04
JP2005285385A	2005-10-13
JP2000030686A	2000-01-28
JP2002151044A	2002-05-24

Other References: