Liu Jiaxing, Wang Zan, Yang Zhihao, Liu Meiling, Liu Hongtao
Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
Materials (Basel). 2024 Dec 5;17(23):5948. doi: 10.3390/ma17235948.
This study presents the synthesis of a transparent, flexible gel polymer electrolyte (GPE) based on the protic ionic liquid BMImHSO and on polyvinyl alcohol (PVA) through solution casting and electrochemical evaluation in a 2.5 V symmetrical C/C electrical double-layer solid-state capacitor (EDLC). The freestanding GPE film exhibits high thermal stability (>300 °C), wide electrochemical windows (>2.7 V), and good ionic conductivity (2.43 × 10 S cm at 20 °C). EDLC, using this novel GPE film, shows high specific capacitance (81 F g) as well as good retention above 90% of the initial capacitance after 4500 cycles. The engineered protic ionic liquid GPE is, hopefully, applicable to high-performance solid-state electrochemical energy storage.
本研究通过溶液浇铸法制备了一种基于质子离子液体BMImHSO和聚乙烯醇（PVA）的透明、柔性凝胶聚合物电解质（GPE），并在2.5V对称C/C型双电层固态电容器（EDLC）中进行了电化学评估。独立的GPE薄膜具有高热稳定性（>300°C）、宽电化学窗口（>2.7V）和良好的离子电导率（20°C时为2.43×10 S cm）。使用这种新型GPE薄膜的EDLC显示出高比电容（81 F g），并且在4500次循环后仍能保持初始电容的90%以上。有望将这种经过设计的质子离子液体GPE应用于高性能固态电化学储能。
