Preparation method of lithium ion battery diaphragm

• Main Authors: WANG SONGZHAO, CHEN WEIJIAN, LIANG CHAOWEI, WANG HUI, SONG GUANGZHI
• Format: Patent
• Language: Chinese; English
• Published: 08.05.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to a preparation method of a lithium ion battery diaphragm. The preparation method comprises the following steps: mixing ultrahigh molecular weight polyethylene and a solvent, and heating and stirring for the first time to obtain a pre-swelling mixed solution; grinding the pre-swelling mixed solution, then adding a fluorine-containing polymer, and heating and stirring for thesecond time to obtain a dispersion solution; carrying out melt extrusion on the dispersion liquid to obtain a plasticized melt film; and carrying out post-treatment on the plasticized melt film. According to the preparation method disclosed by the invention, the ultra-high molecular weight polyethylene can be uniformly plasticized, the formed diaphragm is uniform in thickness distribution, and the method has the advantage of being uniform in micropore size and distribution, small in high-temperature thermal shrinkage, high in puncture strength and high in diaphragm breaking temperature. 本发明涉及一种锂离子电池隔膜的制备方法。所述制备方法包括以下