Multilayer separators are widely used due to their wide shutdown window by combining lower melting temperature and higher melting temperature of different layers. With the development of high power lithium-ion batteries, multilayer separators equipped with effective thermal stability and flame retardancy are highly required. Herein, the poly(methyl methacrylate) modified attapulgite (ATPM) is selected as the heat resistant reinforcing component and blended with polypropylene (PP)/polyethylene (PE) respectively. Then we prepare PP(ATPM)/PE(ATPM) separators via multilayer coextrusion efficiently without multiple stretching processes, which can avoid serious separator shrinkage at elevated temperature. The intertwined ATPM could not only enhance the separator integrity, but also produce water vapor and oxide anti-flaming isolation layers at high temperatures. The as-prepared separators, referred to as MC-TIPS PP/PE/ATPM, exhibit higher thermal stability (with negligible dimensional shrinkage up to 180 °C), better flame retardancy and wider shutdown temperature window (124–183 °C) than the commercial multilayer separators. Moreover, the introduction of ester and hydroxyl groups could improve the wettability and electrolyte uptake of the separators. These properties, as well as the potential for large-scale production of multilayer coextrusion, make MC-TIPS PP/PE/ATPM an ideal choice for high-power battery separators.

多层隔膜通过结合不同层的较低熔化温度和较高熔化温度而被广泛使用，因为它们具有较宽的关闭窗口。随着高功率锂离子电池的发展，对具有有效热稳定性和阻燃性的多层隔膜提出了很高的要求。本文选用聚甲基丙烯酸甲酯改性凹凸棒石（ATPM）作为耐热增强组分，分别与聚丙烯（PP）/聚乙烯（PE）共混。然后，我们通过多层共挤高效制备PP（ATPM）/PE（ATPM）隔膜，无需多次拉伸工艺，可避免隔膜在高温下严重收缩。交织的 ATPM 不仅可以提高分离器的完整性，还能在高温下产生水汽和氧化物阻燃隔离层。所制备的隔膜称为 MC-TIPS PP/PE/ATPM，与商用多层隔膜。此外，酯基和羟基的引入可以提高隔膜的润湿性和电解质吸收率。这些特性，以及大规模生产多层共挤的潜力，使 MC-TIPS PP/PE/ATPM 成为大功率电池隔膜的理想选择。比商用多层隔膜具有更好的阻燃性和更宽的停机温度窗口（124-183°C）。此外，酯基和羟基的引入可以提高隔膜的润湿性和电解质吸收率。这些特性，以及大规模生产多层共挤的潜力，使 MC-TIPS PP/PE/ATPM 成为大功率电池隔膜的理想选择。比商用多层隔膜具有更好的阻燃性和更宽的停机温度窗口（124-183°C）。此外，酯基和羟基的引入可以提高隔膜的润湿性和电解质吸收率。这些特性，以及大规模生产多层共挤的潜力，使 MC-TIPS PP/PE/ATPM 成为大功率电池隔膜的理想选择。