Double-sided coated para-aramid separator and preparation method thereof

Abstract

The present disclosure discloses a double-sided coated para-aramid separator and a preparation method thereof. The double-sided coated para-aramid separator comprises: a base film and a coating applied on the base film, wherein the coating is obtained by coating a para-aramid slurry. The para-aramid slurry comprises: a fumed powder, a ceramic powder, a first solvent, a styrene-butadiene latex solution, nano-calcium carbonate and a para-aramid polymerization liquid, wherein hydrogen chloride produced when synthesizing para-aramid from para-phenylenediamine and terephthaloyl chloride is removed from the para-aramid polymerization liquid before use, and the fumed powder is one or a mixture of several of fumed alumina, fumed silica and fumed barium titanate. In the present disclosure, a solid space occupying method is used to form pores in the coating, thereby increasing the porosity of the coating, so that the para-aramid separator has a larger porosity and a smaller air permeability value.

Dependencies are inferred from the claim text.