离子液体基凝胶电解质的制备及其在超级电容器中的应用

Preparation of Ionic Liquid-based Gel Electrolytes and Application in Supercapacitors

以大豆蛋白(SPI)和丙烯酰胺(AAm)复合交联制备出一种离子液体基凝胶聚合物电解质,并将其应用于超级电容器中,考察了超级电容器的电化学性能和可压缩性能。SPI与聚丙烯酰胺之间的协同作用,赋予凝胶电解质优异的压缩回弹性和耐疲劳强度,在经历80%的压缩应变100次循环后,仍可保持结构完整,应力保持率>80%,塑性变形率<15%,能量损耗系数<0.1。利用凝胶电解质组装的准固态超级电容器,具有优异的电化学性能,最大能量密度为25.99 W·h/kg,最大功率密度为3600 W/kg,且器件整体可承受80%的压缩应变而不发生断裂或损坏,表现出优良的可压缩性和电容稳定性。

Soybean protein isolates(SPI)were integrated with polyacrylamide(PAAm)to form an ionic liquid-containing gel polymer as a new quasi-solid-state electrolyte,which could be used in supercapacitor.And the electrochemical performance and compressibility of supercapacitor were studied.The synergistic effect of SPI and PAAm endowed the gel electrolyte with excellent compressive resilience and fatigue resistance.Particularly,the gel electrolyte could maintain structural integrity even under 80%strain for 100 compression cycles,the plastic deformation was less than 15%and the energy loss coefficient was more than 0.1.The symmetric quasi-solid-state supercapacitor based on this gel electrolyte exhibited satisfied electrochemical performance,delivering the maximum energy density of 25.99 W·h/kg and the maximal power density of 3600 W/kg.And the device could withstand 80%compression strain without structural fracture or damage,showing excellent compressibility and capacitive stability.