We synthesized a temperature-responsive ionic liquid, [N][SS], and incorporated it into an environmentally friendly cellulose acetate (CA)-based battery separator. A pore was formed in the battery separator by [N][SS], which pierced a plasticized part due to water pressure. Varying drying temperatures during membrane fabrication revealed that the CA/[N][SS] membrane dried at 50 °C exhibited greater thickness and a smaller average pore size, resulting in an asymmetric internal structure. Despite the asymmetry, this membrane demonstrated significantly higher water flux and a lower Gurley value compared to the membrane dried at 25 °C, indicating minimal tortuosity and low resistance within the internal pores. Thermal behavior analysis through TGA and DSC, as well as FT-IR spectroscopy, confirmed that [N][SS] remains within the CA matrix, forming coordinative bonds. The findings suggest that the CA/[N][SS] membrane, when used as a Li-ion battery separator, could enhance Li-ion transport properties and conductivity. Moreover, the recyclability of the IL in the membrane fabrication process contributes to a more environmentally friendly approach.

中文翻译：

---

使用热响应性离子液体增强基于 CA 的分离器：实现环保膜生产和多方面应用的途径

我们合成了一种温度响应型离子液体[N][SS]，并将其纳入环保的醋酸纤维素（CA）基电池隔膜中。 [N][SS]在电池隔膜中形成孔，由于水压而刺穿塑化部分。膜制造过程中干燥温度的变化表明，在 50 °C 干燥的 CA/[N][SS] 膜表现出更大的厚度和更小的平均孔径，导致内部结构不对称。尽管存在不对称性，但与 25 °C 干燥的膜相比，该膜表现出明显更高的水通量和更低的 Gurley 值，表明内部孔内的弯曲度最小且阻力较低。通过 TGA 和 DSC 以及 FT-IR 光谱进行的热行为分析证实，[N][SS] 保留在 CA 基质内，形成配位键。研究结果表明，CA/[N][SS]膜用作锂离子电池隔膜时，可以增强锂离子传输性能和电导率。此外，离子液体在膜制造过程中的可回收性有助于实现更加环保的方法。