All-Solid-State High-Voltage Supercapacitors Using an Ionic Plastic Crystal-Based Electrolyte
All-Solid-State High-Voltage Supercapacitors Using an Ionic Plastic Crystal-Based Electrolyte
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DOI：
10.3389/fenrg.2022.854090
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
M. Yoshizawa‐Fujita;S. Kubota;Shuichi Ishimoto
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文献类型：
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作者：
M. Yoshizawa‐Fujita;S. Kubota;Shuichi Ishimoto
近年来，离子塑料晶体（IPCs）在锂离子电池等全固态可充电电池中的应用得到了积极的研究。在这里，我们报道了用介孔碳电极和IPC电解质n -乙基- n -甲基吡啶吡啶双（氟磺酰基）酰胺（[C2mpyr][FSA]）组装的超级电容器。[C2mpyr][FSA]与10 mol%的锂二（氟磺酰）酰胺（LiFSA）掺杂剂作为超级电容器的固体电解质。在25℃下，在0 ~ 2.5 V的电压范围内，以不同的C-速率进行了超级电容器的充放电试验。在较低的C速率下（1c = 8.9 mA g−1），电池的电容为12.3 Fg−1。在20℃时，超级电容器的电容保持率保持在100%左右，这与含有有机电解质溶液的电池相当。使用固体电解质的优点是使用两对介孔碳电极和[C2mpyr][FSA]/LiFSA复合材料制造双极电池。在0-5.0 V电压范围内，在25°C条件下进行了双极电池的充放电试验。在较低的C速率下，双极电池的电容为6.4 Fg−1。双极电池在1000次循环中表现出典型的充放电特征，证实了其稳定的循环性能。因此，IPC电解质是开发全固态高压超级电容器的有趣材料。
Recently, ionic plastic crystals (IPCs) have been actively investigated to develop all-solid-state rechargeable batteries, such as lithium-ion batteries. Herein, we report supercapacitors assembled with mesoporous carbon electrodes and an IPC electrolyte, N-ethyl-N-methylpyrrolidinium bis(fluorosulfonyl)amide ([C2mpyr][FSA]). [C2mpyr][FSA] with a 10 mol% lithium bis(fluorosulfonyl)amide (LiFSA) dopant was used as the solid electrolyte in the supercapacitors. The charge–discharge tests of the supercapacitors were performed at various C-rates in the voltage range of 0–2.5 V at 25°C. The capacitance of the cells was 12.3 Fg−1 at a lower C rate (1 C = 8.9 mA g−1). The capacitance retention of the supercapacitors was maintained at approximately 100% up to 20 C, which was comparable to that of the cells containing organic electrolyte solutions. The advantage of using solid electrolytes was the fabrication of bipolar cells using two pairs of mesoporous carbon electrodes and a [C2mpyr][FSA]/LiFSA composite. The charge–discharge tests of the bipolar cells were also performed in the voltage range of 0–5.0 V at 25°C. The capacitance of the bipolar cells was 6.4 Fg−1 at a lower C rate. The bipolar cells exhibited a typical charge–discharge profile for 1,000 cycles, confirming their stable cyclic performance. Thus, IPC electrolytes are interesting materials for developing all-solid-state high-voltage supercapacitors.