A novel type of sandwiched separator for lithium‐ion batteries has been developed by combining electrospinning and electrospraying techniques. This separator consists of three layers in which the top and bottom layers are prepared by electrospinning a poly(amic acid) ammonium salt (PAAS) solution and the middle layer is obtained by electrospraying a mixture of the PAAS solution and inorganic nanoparticles (SiO₂ or Al₂O₃). Subsequently, the sandwiched separators are imidized at 250°C in a nitrogen atmosphere. The morphology, porosity, thermal stability, mechanical strength, wettability and electrochemical performance of sandwiched separators were examined and the results were compared with those of a commercial separator (SV718). The thermal properties of the sandwiched separators and SV718 were determined using a thermal gravimetric analyzer and a differential scanning calorimeter. The sandwiched separators had no melting peak, whereas SV718 had a melting peak at 139°C, demonstrating the higher thermal stability of sandwiched separators. The electrolyte contact angles of sandwiched separators were around 11.5°, which were significantly lower than that of SV718. Moreover, the porosity and electrolyte uptake of sandwiched separators were over 81% and 910%, respectively, while those values of SV718 were 43% and 121%, respectively. The higher porosity, electrolyte uptake, and wettability of the sandwiched separators resulted in the better their cycling performance and higher specific‐discharge capabilities than SV718.

中文翻译：

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通过静电纺丝和电喷雾将夹层聚酰亚胺复合材料隔膜用于锂离子电池

通过结合电纺丝和电喷雾技术，开发了一种新型的锂离子电池夹层式隔膜。该隔离器由三层组成，其中顶层和底层是通过电纺聚聚酰胺酸铵盐（PAAS）溶液制备的，中间层是通过将PAAS溶液和无机纳米颗粒（SiO ₂或铝₂ O ₃）。随后，将夹层的隔板在氮气气氛中在250℃下酰亚胺化。检查了夹层隔膜的形貌，孔隙率，热稳定性，机械强度，润湿性和电化学性能，并将结果与​​商用隔膜（SV718）进行了比较。使用热重分析仪和差示扫描量热仪测定夹层隔板和SV718的热性能。夹层隔板没有熔化峰，而SV718在139°C时有熔化峰，这表明夹层隔板具有更高的热稳定性。夹层隔板的电解质接触角约为11.5°，远低于SV718。此外，夹层隔板的孔隙率和电解质吸收率分别超过81％和910％，SV718的这些值分别为43％和121％。夹层隔板的孔隙率，电解质吸收率和润湿性更高，因此它们的循环性能比SV718更好，比放电性能更高。