The use of gel polymer electrolytes (GPEs) in electric double layer capacitors (EDLCs) is limited by the liquid injection assembly line currently used in EDLC manufacturing. This paper proposes a postinjection gelated GPE, which can be synthesized by mixing a polymer blend of poly(acrylonitrile-co-methyl acrylate) and poly(ethylene glycol) (i.e., PANMA:EG) with a conventional liquid electrolyte (LE). The as-synthesized GPE is in liquid state and can be applied in the liquid injection assembly line. The gelation time can be tuned by varying the composition of the polymer blend. The functionalities on the polymer chains facilitate the dissociation of ion pairs and suppress the formation of ion–solvent complexes; thus, the GPE has an ionic conductivity that is three times that of the LE. Under polarization for dielectric analysis, the GPE exhibits high storage permittivity and low loss permittivity because of its swift ion motion and polymeric dipole orientation. Owing to its superior permittivity performance, the resulting GPE-EDLC outperforms the LE-EDLC in terms of the ultimate capacitance, rate capability, and charge–discharge cycling stability. The postinjection gelation feature and outstanding permittivity characteristics indicate the suitability of this GPE in industrial-scale assembly lines and practical applications.

凝胶聚合物电解质（GPE）在双电层电容器（EDLC）中的使用受到当前在EDLC制造中使用的注液装配线的限制。本文提出了一种注射后凝胶化的GPE，它可以通过混合聚（丙烯腈-钴-丙烯酸甲酯）和聚（乙二醇）（即PANMA：EG）以及传统的液体电解质（LE）。合成后的GPE处于液态，可以应用在注液装配线中。可以通过改变聚合物共混物的组成来调节胶凝时间。聚合物链上的官能团促进离子对的解离并抑制离子-溶剂络合物的形成；因此，GPE的离子电导率是LE的三倍。在极化下进行介电分析时，由于其快速的离子运动和聚合物偶极子取向，GPE表现出高存储介电常数和低损耗介电常数。由于其优异的介电常数性能，因此在最终电容，速率能力，充放电循环稳定性。注射后的胶凝特性和出色的介电常数特性表明该GPE在工业规模装配线和实际应用中的适用性。