[New R&D by Kanghui Nantong New Material Technology Co., Ltd.] Kanghui Nantong New Material Technology Co., Ltd. has recently developed a heat-resistant lithium-ion battery separator with high liquid absorption rate. This lithium-ion battery separator consists of a porous substrate layer and composite functional layers located on both sides of the substrate. The composite functional layers contain a resin matrix and various functional fillers dispersed within it, including porous fillers and hollow fillers. This design not only enhances the heat resistance of the separator but also significantly improves its liquid absorption rate.