采用静电纺丝技术制备了聚偏氟乙烯/聚丙烯腈/聚甲基丙烯酸甲酯(PVDF/PAN/PMMA)三元复合纳米纤维膜,通过扫描电子显微镜、X射线衍射仪、差示扫描量热仪、接触角测量仪和电化学工作站等探讨了PVDF/PAN与PMMA质量比对复合纳米纤维膜形貌、结晶结构、热性能、亲疏水性能和电化学性能的影响。结果表明:与PVDF/PAN复合纳米纤维膜相比,加入PMMA后PVDF/PAN/PMMA三元复合纤维膜的纤维表面略变粗糙,并且纤维直径有所减小;PMMA的加入抑制了PVDF中β晶的形成,使得PVDF/PAN/PMMA三元复合纳米纤维膜的结晶度有所降低;PVDF/PAN/PMMA三元复合纳米纤维膜的物理阻抗较小,说明该复合纳米纤维膜与电解液浸润性较好;同时循环伏安曲线重合度很高,表明以PVDF/PAN/PMMA三元复合纳米纤维膜作为隔膜组装的钠离子电池在钠离子嵌入和脱出过程中能够保持很好的结构稳定性。
In this paper,PVDF/PAN/PMMA ternary composite nanofiber membrane was successfully prepared via electrospinning technology.Scanning electron microscope (SEM),X-ray diffractometer (XRD),differential scanning calorimeter (DSC),contact angle measurement instrument and electrochemical workstation were used to investigate the influence of the mass ratio of PVDF/PAN to PMMA on the morphology,crystal structure,thermal properties,hydrophilic and hydrophobic properties and electrochemical properties of the composite nanofiber membrane.The results showed that compared with PVDF/PAN composite nanofibrous membrane,the fiber surface of the PVDF/PAN/PMMA composite nanofiber membrane was slightly rougher and the fiber diameter was reduced.The addition of PMMA inhibited the formation of β-crystal in PVDF,which reduced the crystallinity of PVDF/PAN/PMMA ternary composite nanofiber membrane.The physical impedance of PVDF/PAN/PMMA ternary composite nanofiber membrane was small,demonstrating excellent wettability with electrolyte.At the same time,the high coincidence degree of CV curves also indicated that the sodium-ion battery assembled with PVDF/PAN/PMMA composite nanofibrous membrane as separator could maintain good structural stability during the process of sodium ion insertion and extraction.
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基金资助
中原工学院基本科研业务费专项资金项目(K2022QN009);河南省科技攻关项目(232102230141);河南省自然科学基金(242300420371);中国纺织工业联合会指导性项目(2021046);河南省高校科技创新团队项目(23IRTSTHN019)
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