In the current study, a novel needleless electro-spinneret based on the Von Koch curve of Fractal Theory is developed to prepare electrospun membrane. A sandwich-like composite separator is elaborately designed with two layers of SiO₂ nanoparticles doped polyimide membranes being the sheath layers and a single layer of ethylcellulose modified PE membrane being core layer towards its application for separators in high-performance lithium-ion batteries. This tri-layered composite separator combines both thermal shutdown function at low temperature and thermal runaway function at high temperature, where ethylcellulose is used to enhance the interfacial affinity and strength between commercial polyethylene separator and the electrospun polyimide membrane. The two sheath layers of electrospun membrane prepared by SiO₂ nanoparticles doped polyimide impart the separator with high thermal stability and high-temperature runaway function at, and the single core layer of ethylcellulose modified polyethylene membrane provides high mechanical property and low-temperature shutdown function. The resultant tri-layered composite membrane is of high potential as lithium-ion battery separators for electrically powered vehicles.

在当前的研究中，开发了一种基于分形理论的冯·科赫曲线的新型无针电纺丝板来制备电纺膜。用两层SiO ₂精心设计了类似三明治的复合隔板纳米粒子掺杂的聚酰亚胺膜是皮层，而乙基纤维素改性的聚乙烯膜的单层是核心层，这是其在高性能锂离子电池隔膜中的应用。这种三层复合隔板结合了低温下的热关闭功能和高温下的热失控功能，其中乙基纤维素用于增强商用聚乙烯隔板和电纺聚酰亚胺膜之间的界面亲和力和强度。SiO ₂制备的电纺膜的两个鞘层掺有纳米颗粒的聚酰亚胺赋予隔膜高的热稳定性和高温失控功能，乙基纤维素改性的聚乙烯膜的单芯层提供了较高的机械性能和低温关闭功能。所得的三层复合膜作为电动车辆的锂离子电池隔板具有高潜力。