Title:
COMPOSITE SEPARATOR AND PREPARATION METHOD THEREFOR, SECONDARY BATTERY AND ELECTRIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/007964
Kind Code:
A1
Abstract:
The present application provides a composite separator and a preparation method therefor, a secondary battery, and an electric device. The composite separator comprises a base film and a heat-resistant coating bonded to at least one side surface of the base film; the heat-resistant coating comprises heat-resistant resin and inorganic particles; a mass ratio of the heat-resistant resin to the inorganic particles is less than or equal to 6:4; the inorganic particles are of a porous structure; the specific surface area of the inorganic particles is 50-150 m2/g; and the impedance of the composite separator is less than or equal to 1 Ω/cm2. Therefore, the problem of separator impedance rise caused by the heat-resistant coating is solved while ensuring the high thermal stability of the separator, so that the impedance of the separator is reduced.
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Inventors:
SUN ZEMENG (CN)
YANG DONGFANG (CN)
XIE FENGCHAO (CN)
YANG DONGFANG (CN)
XIE FENGCHAO (CN)
Application Number:
PCT/CN2023/104146
Publication Date:
January 11, 2024
Filing Date:
June 29, 2023
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H01M50/451; H01M50/414
Foreign References:
| CN111492504A | 2020-08-04 | |||
| CN111446404A | 2020-07-24 | |||
| CN103618059A | 2014-03-05 | |||
| CN105765761A | 2016-07-13 | |||
| JPH11260338A | 1999-09-24 |
Attorney, Agent or Firm:
TDIP & PARTNERS (CN)
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