ISOLATION FILM WITH LOW SHRINKAGE AT WIDE TEMPERATURE RANGE AND PREPARATION METHOD THEREFOR

Title:

ISOLATION FILM WITH LOW SHRINKAGE AT WIDE TEMPERATURE RANGE AND PREPARATION METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2017/181848

Kind Code:

A1

Abstract:

Disclosed are an isolation film with low shrinkage at a wide temperature range and a preparation method therefor, which fall within the technical field of electrochemistry. The isolation film of the present invention comprises an irradiation cross-linked fluorine-containing polymer A with a melting point of 150°C or more, and/or a polymer B containing a benzene ring in the backbone of a molecule; ultra-high molecular weight polyethylene with a molecular weight of 1.0×106 to 10.0×106; and high density polyethylene with a density within the range of 0.940-0.976 g/cm3. The temperature difference between the pore-closing temperature and the film-breaking temperature of the isolation film is 80°C-90°C, and is preferably 85°C-90°C, and the thermal shrinkage thereof is not higher than 2.0%. The isolation film of the present invention has a higher difference between the film-breaking temperature and the pore-closing temperature, and a lower thermal shrinkage. When the isolation film of the present invention is used in an electrochemical device, the reliability and safety of the electrochemical device are effectively improved.

Inventors:

CHENG YUE (CN)
XIONG LEI (CN)
DENG HONGGUI (CN)
HE FANGBO (CN)
WANG WEIQIANG (CN)

Application Number:

PCT/CN2017/079539

Publication Date:

October 26, 2017

Filing Date:

April 06, 2017

Export Citation:

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Assignee:

SHANGHAI ENERGY NEW MAT TECH CO LTD (CN)

International Classes:

C08L23/06; B29D7/01; C08J9/28; C08L27/16; C08L61/16; H01M50/403; H01M50/406; H01M50/414; H01M50/417; H01M50/423; H01M50/426; H01M50/489

Foreign References:

CN101272907A	2008-09-24
JP2015013913A	2015-01-22
CN101296795A	2008-10-29

Other References: