Title:
SEPARATOR FILM AND PREPARATION METHOD THEREFOR, SECONDARY BATTERY, AND ELECTRICAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/065367
Kind Code:
A1
Abstract:
The present application provides a separator film, a method for preparing the separator film, a secondary battery, and an electrical device. The separator film comprises a first base material layer, a mixed material layer, and a second base material layer; the mixed material layer is arranged between the first base material layer and the second base material layer; the mixed material layer comprises an inorganic material and a dispersing agent; the electronic conductivity σ of the separator film satisfies: 1×10-13 mS/cm<σ<1×10-1 mS/cm. According to the separator film in the present application, the occurrence of lithium dendrites or sodium dendrites piercing the separator film can be delayed, thereby delaying the occurrence of short circuit in batteries, and prolonging the service life of batteries; the wettability of the separator film to electrolytes is improved, the charge/discharge rate of batteries is increased, the thermal shrinkage performance of batteries is improved, the safety of batteries is improved, and the initial Coulombic efficiency of batteries is improved.
Inventors:
FAN YULEI (CN)
LIU FENG (CN)
ZHONG WEI (CN)
GE XIAOMING (CN)
OUYANG CHUYING (CN)
LIU FENG (CN)
ZHONG WEI (CN)
GE XIAOMING (CN)
OUYANG CHUYING (CN)
Application Number:
PCT/CN2022/122476
Publication Date:
April 04, 2024
Filing Date:
September 29, 2022
Export Citation:
Assignee:
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD (CN)
International Classes:
H01M50/431; H01M50/446; H01M50/451
Foreign References:
| CN108448160A | 2018-08-24 | |||
| CN109980164A | 2019-07-05 | |||
| CN102064299A | 2011-05-18 | |||
| CN114361720A | 2022-04-15 | |||
| CN110828756A | 2020-02-21 | |||
| CN110931689A | 2020-03-27 | |||
| US8481195B1 | 2013-07-09 |
Attorney, Agent or Firm:
CCPIT PATENT AND TRADEMARK LAW OFFICE (CN)
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