SEPARATOR COMPRISING ORGANIC/INORGANIC COMPOSITE POROUS COATING LAYER FOR ELECTROCHEMICAL DEVICE AND ELECTROCHEMICAL DEVICE INCLUDING SAME

WIPO Patent Application WO/2023/075271

A1

A separator according to the present invention comprises, on an organic/inorganic composite porous coating layer, a particulate binder resin comprising a mixture of an acryl-based binder and a PVDF-based binder, and thus has excellent adhesion with an electrode, in a dry state and in a wet state. Accordingly, in a roll-to-roll continuous process, the dimensional stability and processability of an electrode assembly can be improved, and even in a state of being impregnated with an electrolyte, a strong binding strength between the separator and an electrode can be maintained, and thus high adhesion can be maintained without degrading interfacial resistance characteristics. Thus, inorganic particles can be well fixed without detachment, thereby improving the dimensional stability of the separator. Accordingly, the heat stability and insulating properties of a battery can be improved, and due to a porous structure with an interstitial volume between particles in the porous coating layer, ion conduction between an electrode and the separator is not hindered, and thus the rate of resistance increase is low and lifespan characteristics are excellent.

KIM MIN JI (KR)
LEE SEUNG HYUN (KR)
KIM HYE WON (KR)
KA KYUNG RYUN (KR)

PCT/KR2022/015890

May 04, 2023

October 18, 2022

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LG ENERGY SOLUTION LTD (KR)

H01M50/451; H01G11/52; H01M50/417; H01M50/446

KR20170103208A	2017-09-13
KR20160136089A	2016-11-29
KR20200009012A	2020-01-29
KR20160127473A	2016-11-04
KR20200036648A	2020-04-07
KR20040070096A	2004-08-06

JOURNAL OF MATERIALS CHEMISTRY, vol. 22, 2012, pages 341

IPCJ PATENT & LAW FIRM (KR)

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