Separators with excellent thermal stability and electrolyte wettability are essential for high-energy-density lithiumion batteries (LIBs). In this study, polybenzimidazole (PBI) nanofiber membranes were prepared by electrospinning and subsequent thermal calendering for a high-temperature resistance and flame-retardant LIB separator. The PBI nanofiber membrane calendered at 120 oC (PBI-120) was evaluated as an LIB separator due to its overall good physical properties. PBI- 120 showed better thermal dimensional stability, electrochemical stability, ionic conductivity, and interfacial compatibility with the electrodes than did a commercial separator, Celgard 2400. The cell assembled with PBI-120 showed stable chargedischarge profiles and cycle performance. The PBI nanofiber separator was demonstrated to be a promising separator candidate for enhanced safety and electrical performance of high-energy-density LIBs.

具有出色的热稳定性和电解质润湿性的隔膜对于高能量密度的锂离子电池（LIB）至关重要。在这项研究中，聚苯并咪唑（PBI）纳米纤维膜是通过静电纺丝和随后的热压延制备的，以制备耐高温和阻燃的LIB隔膜。由于其总体良好的物理性能，在120 oC下压延的PBI纳米纤维膜（PBI-120）被评估为LIB隔板。与商用隔膜Celgard 2400相比，PBI-120表现出更好的热尺寸稳定性，电化学稳定性，离子电导率和与电极的界面相容性。与PBI-120组装的电池表现出稳定的充放电曲线和循环性能。