More than 80% of the thermal runaway in Lithium-ion battery (fever, smoke, fire, explosion, etc.) is caused by the internal short circuit of the battery itself, so the battery internal short circuit is the biggest hidden danger of lithium-ion battery safety. The main cause of the battery short circuit is the diaphragm material. At present, the commercial diaphragm material is mainly polyolefin porous polymer film, the use of such a large membrane of lithium-ion battery in the state of abuse (internal short circuit, external short circuit, overcharge, etc.), easilty induce the battery internal high temperature ,and cause the battery to burn or explode. Therefore, the study of high-temperature/ high-safety diaphragm has become a key issue in lithium ion battery research. Ceramic coated modified diaphragm can be fully opened diaphragm closed cell temperature (Shutdown) and the temperature difference between the melting temperature, it’s excellent temperature resistance and high safety has become the focus of research and development, which has important practical significance and scientific value.

   The research focus of this research group is to use the substrate film surface treatment technology and inorganic ceramic powder dispersion technology to optimize the coating effect of ceramic powder, the establishment of coating thickness, ceramic type, particle size, surface characteristics and the battery performance, the relationship between the technical parameters of the ceramic diaphragm, the development of the diaphragm at the same time with Shutdown function and high heat resistance.