POLYOLEFIN POROUS MEMBRANE AND PREPARATION METHOD THEREFOR, BATTERY SEPARATOR, AND ELECTROCHEMICAL DEVICE

WIPO Patent Application WO/2024/077927

A1

The present disclosure relates to the technical field of separators for electrochemical devices, and discloses a polyolefin porous membrane and a preparation method therefor, a battery separator and an electrochemical device. The polyolefin porous membrane of the present disclosure has a network fiber structure. Upon observing a 20,000-fold SEM image of the polyolefin porous membrane, the polyolefin porous membrane has the following characteristics: (1) in a circle having a radius of 1,000 nm, a fiber orientation result R_MD of fibers having a fiber diameter of greater than 15 nm in an MD direction satisfies (R_MD)2<0.8; and (2) in a circle having a radius of 1,000 nm, a fiber orientation result R_TD of fibers having a fiber diameter of greater than 15 nm in a TD direction satisfies (R_TD)2<0.8. Therefore, the polyolefin porous membrane of the present disclosure can achieve the mechanical property consistency of a separator in a battery, thereby increasing the stability of the separator in battery production and the safety of battery use.

XUE SHAN (CN)
BAI YAOZONG (CN)
JIA GUOZHONG (CN)
LIU ZHIGANG (CN)
ZHENG LEI (CN)
DONG QIUCHUN (CN)
XUE YUNQING (CN)
MA YUAN (CN)
WU QIYANG (CN)
MENG XIANGGAN (CN)
ZHANG XUJIE (CN)
LIU GAOJUN (CN)

PCT/CN2023/090556

April 18, 2024

April 25, 2023

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SINOMA LITHIUM BATTERY SEPARATOR NANJING CO LTD (CN)

H01M50/417; H01M50/403

CN115312973A	2022-11-08
CN110431176A	2019-11-08
CN113488740A	2021-10-08
KR20210106274A	2021-08-30
JP2005056851A	2005-03-03
JP2014141644A	2014-08-07
CN107250234A	2017-10-13

CHOFN INTELLECTUAL PROPERTY (CN)

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