Battery separator and its preparation method, battery
The battery separator, achieved through multi-layer co-extrusion process and microporous design, solves the problem of poor air permeability after coating of lithium battery separators, and achieves high air permeability, good ion conduction and excellent thermal stability, thereby improving the cycle and rate performance of the battery.
CN116111284BActive Publication Date: 2026-05-26LUCKY FILM CO LTD
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- LUCKY FILM CO LTD
- Filing Date
- 2022-10-28
- Publication Date
- 2026-05-26
Smart Images
Figure CN116111284B_ABST
Abstract
This invention discloses a battery separator, its preparation method, and a battery. The battery separator includes a base film layer comprising a first surface layer, a second surface layer, and an intermediate layer, with the intermediate layer located between the first and second surface layers. All three layers have a microporous structure, and at least one of the first and second surface layers has a larger average pore size on the side furthest from the intermediate layer than the average pore size of the intermediate layer. This battery separator maintains good air permeability both before and after coating, and also exhibits excellent mechanical properties and thermal stability.
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