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|1. (WO2017152731) METHOD FOR PREPARING LITHIUM-ION BATTERY SEPARATOR|
|Applicants:||SHANGHAI ENERGY NEW MATERIALS TECHNOLOGY CO., LTD.
|Title:||METHOD FOR PREPARING LITHIUM-ION BATTERY SEPARATOR|
Disclosed is a method for preparing a lithium-ion battery separator. The method comprises: performing cooling, molding, stretching, and reaming on a liquid phase stable system that contains polyethylene, and then performing solvent extraction and thermoforming to obtain a lithium-ion battery separator, wherein the stretching and reaming processes comprise prestretching and simultaneous bidirectional stretching, and the prestretching is completed before the simultaneous bidirectional stretching.