Membranes were prepared from polyacrylonitrile (PAN) fibers with uniform diameter for lithium-ion battery separators using optimized electrospinning parameters. In this work, the coefficient of variation (CV) is proposed as one of the indexes to evaluate the uniform consistency of fiber diameter. The most uniform fibrous membrane was compared with a control group that had different uniformity. The effects of the uniformity of the fiber diameter were studied in terms of the membrane porosity, electrolyte absorption, mechanical tensile strength, and thermal stability. The membranes were assembled into coin cells with lithium cobaltite cathodes and graphite anodes, and the performance of the cells was tested. As the uniformity of the fiber diameter increased, the ionic conductivity improved and the interface resistance decreased. The proposed separator improves the discharge capacity (181 mAh·g⁻¹ at the 0.2C rate), C-rate cycling performance, and Coulombic efficiency (99.64 %), which indicates that the uniform membrane could be a candidate for high-performance lithium-ion battery separators.

使用优化的电纺丝参数，由直径均匀的聚丙烯腈（PAN）纤维制备膜，用于锂离子电池隔膜。在这项工作中，提出了变异系数（CV）作为评估纤维直径均匀一致性的指标之一。将最均匀的纤维膜与具有不同均匀性的对照组进行比较。从膜的孔隙率，电解质吸收率，机械拉伸强度和热稳定性方面研究了纤维直径均匀性的影响。将该膜组装成具有钴酸锂阴极和石墨阳极的纽扣电池，并测试电池的性能。随着纤维直径均匀度的增加，离子电导率提高，界面电阻降低。在0.2C速率下为^-1），C速率循环性能和库仑效率（99.64％），这表明均匀的膜可以用作高性能锂离子电池隔膜的候选材料。