SEPARATOR WITH POROUS COATING LAYER, MANUFACTURING METHOD THEREFOR AND ELECTROCHEMICAL DEVICE COMPRISING SAME

Title:

SEPARATOR WITH POROUS COATING LAYER, MANUFACTURING METHOD THEREFOR AND ELECTROCHEMICAL DEVICE COMPRISING SAME

Document Type and Number:

WIPO Patent Application WO/2010/117195

Kind Code:

A2

Abstract:

The separator of the present invention comprises: (a) a non-woven fabric base with pores; (b) fine thermoplastic powders put in the pores of the non-woven fabric base, the powders having an average particle size smaller than that of the pores and a melting point lower than the melting point or decomposition temperature of the non-woven fabric base; and (c) a porous coating layer disposed on at least one side of the non-woven fabric base, the layer containing a mixture of inorganic particles and a binder polymer having a melting point or decomposition temperature higher than the melting point of the fine thermoplastic powders, wherein the inorganic particles are interconnected and fixed with one another by the binder polymer, and interstitial volumes among the inorganic particles form pores in the porous coating layer. According to the present invention, it is possible to obtain a separator with a uniform porous coating layer since such a porous coating layer is formed after filling large pores formed in the non-woven fabric base with fine thermoplastic powders first. Therefore, by using the non-woven fabric base as the separator, an increase in CV interval due to a failure in charging or the occurrence of a leak current can be prevented. Moreover, with the fine thermoplastic powders, the separator of the present invention has a shutdown function and maintains cell stability even during a thermal runaway by means of the uniform porous coating layer.

Inventors:

YOON SU-JIN (KR)
PARK PIL-KYU (KR)
KIM JONG-HUN (KR)
YOO JIN-NYOUNG (KR)
KIM IN-CHUL (KR)
LEE SANG-YOUNG (KR)

Application Number:

PCT/KR2010/002106

Publication Date:

October 14, 2010

Filing Date:

April 06, 2010

Export Citation:

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Assignee:

LG CHEMICAL LTD (KR)
YOON SU-JIN (KR)
PARK PIL-KYU (KR)
KIM JONG-HUN (KR)
YOO JIN-NYOUNG (KR)
KIM IN-CHUL (KR)
LEE SANG-YOUNG (KR)

International Classes:

H01M50/403; H01M50/414; H01M50/417; H01M50/426; H01M50/434; H01M50/451

Foreign References:

KR20090031234A	2009-03-25
KR20100030996A	2010-03-19
KR20070019958A	2007-02-16

Other References: