Du Haiyan, Wu Zemin, Xu Yuyu, Liu Shaoze, Yang Huimin
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Yingze West Street 79, Taiyuan 030024, China.
Polymers (Basel). 2020 Feb 2;12(2):297. doi: 10.3390/polym12020297.
In this work, solid-state polymer supercapacitor (SSC) was assembled using poly(3,4-ethylenedioxythiophene/carbon paper (PEDOT/CP) as an electrode and ionic liquid (1-butyl-3-methylimidazole tetrafluoroborate)/polyvinyl alcohol/sulfuric acid (IL/PVA/HSO) as a gel polymer electrolyte (GPE). The GPE was treated through freezing-thawing (F/T) cycles to improve the electrochemical properties of PEDOT SSC. Cyclic voltammetry (CV), galvanostatic charge-discharge measurements (GCD) and electrochemical impedance spectroscopy (EIS) techniques and conductivity were carried out to study the electrochemical performance. The results showed that the SSC based on ionic liquid GPE (SSC-IL/PVA/HSO) has a higher specific capacitance (with the value of 86.81 F/g at 1 mA/cm) than the SSC-PVA/HSO.The number of F/T cycles has a great effect on the electrochemical performance of the device. The energy density of the SSC treated with 3 F/T cycles was significantly improved, reaching 176.90 Wh/kg. Compared with the traditional electrolytes, IL GPE has the advantages of high ionic conductivity, less volatility, non-flammability and wider potential window. Moreover, the IL GPE has excellent elastic recovery and self-healing performance, leading to its great potential applications in flexible or smart energy storage equipment.
在本工作中，以聚（3,4 - 乙撑二氧噻吩/碳纸）（PEDOT/CP）作为电极，离子液体（1 - 丁基 - 3 - 甲基咪唑四氟硼酸盐）/聚乙烯醇/硫酸（IL/PVA/HSO）作为凝胶聚合物电解质（GPE）组装了固态聚合物超级电容器（SSC）。通过冻融（F/T）循环对GPE进行处理，以改善PEDOT SSC的电化学性能。采用循环伏安法（CV）、恒电流充放电测量（GCD）、电化学阻抗谱（EIS）技术以及电导率测试来研究其电化学性能。结果表明，基于离子液体GPE的SSC（SSC - IL/PVA/HSO）比SSC - PVA/HSO具有更高的比电容（在1 mA/cm²时为86.81 F/g）。F/T循环次数对该器件的电化学性能有很大影响。经过3次F/T循环处理的SSC的能量密度显著提高，达到176.90 Wh/kg。与传统电解质相比，离子液体GPE具有离子电导率高、挥发性小、不可燃以及电位窗口宽等优点。此外，离子液体GPE具有优异的弹性恢复和自愈性能，使其在柔性或智能储能设备中具有巨大的潜在应用价值。
