基于尼龙6和聚偏氟乙烯复合隔膜的凝胶聚合物电解质

通过连续静电纺丝法制备了具有三明治结构的尼龙6(PA6)/聚偏氟乙烯(PVDF)/尼龙6三层复合膜,并将其用作锂离子电池凝胶聚合物隔膜.通过扫描电子显微镜(SEM)观察到该隔膜由无序的纳米纤维交织而成,具有大量的相互贯通的3D孔道.用差示扫描量热法(DSC)分析了隔膜的热稳定性,其特殊的多孔三明治结构及2种材料的搭配可...

The Gel Polymer Electrolyte Based on Nylon 6 and Polyvinylidene Fluoride Membrane

The Nylon 6 (PA6)/Polyvinylidene fluoride (PVDF)/Nylon 6 (PA6) three-layer composite membrane with a sandwich structure for gel polymer electrolyte is prepared by continuous electrospinning. Scanning electron microscopy (SEM) showed that the membrane is composed of disordered nanofibers interwoven with each other, with a large number of interpenetrating 3D channels. The thermal stability of the diaphragm is analyzed with differential scanning calorimetry (DSC). The special porous sandwich structure and the combination of the two materials can effectively improve the safety of the lithium ion battery. Gel polymer electrolyte (GPE) is obtained by absorbing a small amount of lithium hexafluorophosphate electrolyte (1 mol/L LiPF₆ solution, ethylene carbonate(EC)/dimethyl carbonate(DMC)/ethyl methyl carbonate(EMC), 1∶1∶1 for mass ratio) with a composite membrane. The ionic conductivity of the electrolyte reaches 4.2 mS/cm at room temperature, and the interfacial dynamic stability between the electrolyte and the electrode is good. In order to study the practicability of gel polymer electrolyte, a button battery is assembled with lithium sheet anode and commercial lithium iron phosphate cathode material. The battery shows good cycling and rate performance.