Battery diaphragm and its manufacturing method and application

摘要

The present invention relates to a battery diaphragm and its manufacturing method and application, wherein the diaphragm is composed of a lithium ion battery diaphragm substrate and an inorganic coating layer, the substrate is composed of a support layer and a dense layer, and the inorganic coating layer is a dense layer Applied on; The diaphragm has exceptional high-temperature and high-temperature performance, and still has a certain strength even after treating at 300°C for 1 hour, and the heat shrinkage is less than or equal to 2%, and the stability and isolation of applying the diaphragm to a high-temperature rigid structure. Guaranteed, the substrate has a uniformly tight two-layer structure, effectively controls the phenomenon of pinholes and packing particles falling off during the subsequent coating process, and the lithium ion battery diaphragm satisfies the standards of heat resistance, voids and strength, and is comprehensive The performance is outstanding.