Preparation method of aramid / aluminum oxide composite diaphragm

Abstract

The application discloses a preparation method of aramid fiber / alumina composite diaphragm and belongs to the technical field of battery diaphragms. The preparation method of the aramid fiber / alumina composite diaphragm comprises the following steps: adding alumina particles, aramid fibers, a polymer binder and a dispersing agent into an organic solvent, uniformly dispersing, and obtaining a suspension; coating the suspension on a base film, performing micro-pressure treatment after drying, and obtaining the aramid fiber / alumina composite diaphragm. The aramid fiber / alumina composite diaphragm prepared by the preparation method has uniform thickness, high porosity, short electrolyte immersion time, high peeling strength and excellent comprehensive performance, and when the aramid fiber / alumina composite diaphragm is applied to a lithium ion battery, the capacity and cycle performance of the lithium ion battery can be improved.