Abstract In this work we evaluated the influence of different gel electrolytes prepared with a synthesized poly(ionic liquid) – PIL matrix (PILTFSI) and two ionic liquids (ILs) 1-methyl-3-butylimidazolium bis(fluorosulfonyl)imide (MBIMFSI) and 1,2-dimethyl-3-propylimidazolium bis(trifluoromethylsulfonyl)imide (DPITFSI) on the electrochemical properties of solid-state supercapacitors. The synthesized PIL/IL gel electrolytes exhibited a conductivity of 3.2 × 10−3 S cm−1 (MBIMFSI) and 5.0 × 10−4 S cm−1 (DPITFSI) at 25 °C and electrochemical windows of 2.8 V and 3.0 V, respectively (obtained by linear sweep voltammetry). By using galvanostatic charge/discharge measurements carried out in a synchronous 2–3 electrode experiment, which allows the simultaneous registration of the voltage of the cell and the potential (versus a reference) of the positive and negative electrodes, we was able to evaluate in details the influence of each gel systems (focusing of the different ions of the IL) on the work voltage and capacitance of the cells. We have demonstrated that the working voltage of the cell (including the work potential of each electrode) should be determined using the complete cell instead of the electrochemical window of the electrolyte obtained with blocking electrodes. Additionally, we showed which gel was able to give to the supercapacitor the best performance, and we have described for the first time the asymmetry on the double layer formation in such PIL/IL solid-state supercapacitors prepared with a symmetrical configuration (same material and same mass in both electrodes).

中文翻译：

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PIL/IL 凝胶聚合物电解质：IL 离子对固态超级电容器性能的影响

摘要 在这项工作中，我们评估了用合成的聚（离子液体）-PIL 基质（PILTFSI）和两种离子液体（IL）1-甲基-3-丁基咪唑鎓双（氟磺酰基）亚胺（MBIMFSI）和两种离子液体（IL）制备的不同凝胶电解质的影响。 1,2-二甲基-3-丙基咪唑鎓双（三氟甲基磺酰基）亚胺（DPITFSI）对固态超级电容器电化学性能的影响。合成的 PIL/IL 凝胶电解质在 25°C 下表现出 3.2 × 10−3 S cm−1 (MBIMFSI) 和 5.0 × 10−4 S cm−1 (DPITFSI) 的电导率和 2.8 V 和 3.0 V 的电化学窗口，分别（通过线性扫描伏安法获得）。通过使用在同步 2-3 电极实验中进行的恒电流充电/放电测量，这允许同时记录电池的电压和正极和负极的电位（相对于参考），我们能够详细评估每个凝胶系统（聚焦 IL 的不同离子）对电池的工作电压和电容。我们已经证明，电池的工作电压（包括每个电极的工作电位）应该使用完整的电池而不是用阻断电极获得的电解质的电化学窗口来确定。此外，我们展示了哪种凝胶能够为超级电容器提供最佳性能，