Abstract

A series of pore-controllable polyamine (PAI) layer-coated polyolefin (PE) separators (PAI-PE-1, PAI-PE-2, and PAI-PE-3) are prepared by using a phase-transfer and gravure-printing method and used to improve the safety of pouch lithium-ion batteries (LIBs) based on a PAI “guest-host transition” and PE “pore on-off” cooperative strategy. And the safety mechanism for the LIBs using PAI-PE-1, PAI-PE-2, and PAI-PE-3 separators with pore sizes of approximately 0.02, 0.17, and 0.85 μm is discussed. In the overcharge, nail, and hot box tests, the LIBs with PAI-PE separators all meet safety requirements, while the LIBs with PE separators exhibit either fire or smoke issues. The LIBs with PAI-PE-1 separators have the lowest temperature of 102 °C and the highest residual voltage of 3.97 V in the nail and hot box tests, respectively, and the LIBs with PAI-PE-3 separators have the lowest temperature of 129 °C in the overcharge test. The mechanism for the enhanced safety of LIBs with PAI-PE separators is ascribed to a PAI “guest-host transition” and PE “pore on-off” cooperative process. These results indicate that this pore-controllable PAI-PE separator has promising prospects in the application of LIBs with enhanced safety requirements.

Graphical abstract

中文翻译：

---

用于袋装锂离子电池的可控孔多胺（PAI）涂层聚烯烃（PE）隔膜，具有更高的安全性

摘要

通过使用相转移和凹版印刷来制备一系列孔可控的多胺（PAI）涂层聚烯烃（PE）隔离膜（PAI-PE-1，PAI-PE-2和PAI-PE-3）的方法，并基于PAI的“来宾-宿主过渡”和PE的“开-关”合作策略来提高袋装锂离子电池（LIB）的安全性。并讨论了使用孔径分别约为0.02、0.17和0.85μm的PAI-PE-1，PAI-PE-2和PAI-PE-3隔板的LIB的安全机制。在过充，钉子和热箱测试中，带有PAI-PE隔板的LIB均符合安全要求，而带有PE隔板的LIB则存在着火或冒烟的问题。在钉子和热箱测试中，带有PAI-PE-1隔板的LIB的最低温度分别为102°C和最高的残余电压为3.97 V，带有PAI-PE-3隔板的LIB在过充电测试中的最低温度为129°C。带有PAI-PE分离器的LIB增强安全性的机制归因于PAI的“来宾-宿主过渡”和PE的“开-关”孔合作过程。这些结果表明，这种孔隙可控的PAI-PE分离器在具有更高安全性要求的LIB的应用中具有广阔的前景。