A battery separator and its manufacturing method

Abstract

This invention proposes a battery separator, characterized by comprising: at least one base film; at least one inorganic layer located on the base film; and a plurality of polymeric microparticles located on the inorganic layer, wherein the density of the polymeric microparticles is less than the density of the inorganic layer. This invention involves blending the prepared multilayered polymeric microparticles with barium titanate, coating the blended slurry onto the base film, and then drying it in an oven. During the drying process, the density difference between the barium titanate and the polymeric microparticles causes the denser barium titanate to sink while the polymeric microparticles float, resulting in a battery separator with excellent heat resistance and high adhesion.

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