Rapid formation of polyimide nanofiber membranes via hot-press treatment and their performance as Li-ion battery separators†,RSC Advances

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Rapid formation of polyimide nanofiber membranes via hot-press treatment and their performance as Li-ion battery separators†
RSC Advances ( IF 3.9 ) Pub Date : 2018-04-19 00:00:00 , DOI: 10.1039/c8ra01556b
Jian Hou ₁ , Wongi Jang _{1,

2} , Sungyul Kim ₃ , Jun-Hyun Kim ₂ , Hongsik Byun ₁

Affiliation

We describe a new strategy to prepare thermally- and electrochemically-stable polyimide (PI) nanofiber membranes by the hot-press treatment of polyamic acid (PAA) nanofiber sheets in situ and examine their performance as Li-ion battery separators. Typical thermal imidization of PAA to PI membranes using sequential high temperature treatments in an oven takes a long time, but our method readily completes this conversion process at a mild temperature in 30 min while generating a high probability of inter-nanofiber imidization. Along with the improved electrolyte uptake capability and uniform distribution of the pore size and porosity caused by the dense and compact arrangements, the hot-press-induced PI membrane exhibits relatively thin sheets and a much greater mechanical strength than the membrane prepared by the thermal treatment. Subsequently, these PI-based membranes are installed in Li-ion full coin cells as battery separators whose C-rate (charging and discharging) performances are comparable to a commercial polyethylene (PE) separator. In addition, the highly improved thermal stabilities of these PI separators over PE separators are observed during thermal shrinkage and hot-box tests. Overall, our strategy can allow for the manufacture of diverse PI-based membranes with minimal preparation time and cost that can be utilized in high power portable devices requiring thermal and electrochemical stability.

中文翻译：

通过热压处理快速形成聚酰亚胺纳米纤维膜及其作为锂离子电池隔膜的性能†

我们描述了一种通过原位热压处理聚酰胺酸 (PAA) 纳米纤维片来制备热和电化学稳定的聚酰亚胺 (PI) 纳米纤维膜的新策略并检查它们作为锂离子电池隔膜的性能。在烘箱中使用连续高温处理将 PAA 热酰亚胺化为 PI 膜需要很长时间，但我们的方法很容易在温和的温度下在 30 分钟内完成这一转化过程，同时产生很高的纳米纤维间酰亚胺化的可能性。除了由致密和紧凑的排列引起的电解质吸收能力的提高和孔径和孔隙率的均匀分布外，热压诱导的 PI 膜表现出相对薄的薄片和比热处理制备的膜大得多的机械强度. 随后，这些基于 PI 的膜作为电池隔膜安装在锂离子全纽扣电池中，其 C 率（充电和放电）性能可与商用聚乙烯 (PE) 隔膜相媲美。此外，在热收缩和热盒测试期间，观察到这些 PI 隔膜相对于 PE 隔膜的热稳定性有了很大提高。总体而言，我们的策略可以以最少的制备时间和成本制造各种基于 PI 的膜，可用于需要热稳定性和电化学稳定性的高功率便携式设备。

更新日期：2018-04-19

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