羧基改性聚乙烯醇硼酸钾水凝胶电解质制备及应用研究

摘要

以聚乙烯醇(PVA)与羧基改性聚乙烯醇(CMPVA)为基体,通过原位电沉积法在活性炭电极表面分别制备出聚乙烯醇硼酸钾(PVAPB)水凝胶电解质(HGE)和羧基改性聚乙烯醇硼酸钾(CMPVAPB)HGE.对这两种HGE的结构、形貌、热稳定性和电化学性能进行研究和对比.结果表明:两种HGE均具有稳定的化学结构,并表现出良好耐热性及优异的电化学性能;与PVAPB HGE相比,CMPVAPB HGE与电解质盐的相容性更好,电解质盐浓度更高.由CMPVAPB HGE组装的超级电容器(SC),其离子电导率(1.23×10–3S/cm)和比容量(94.9 F/g)高于PVAPB HGE组装的SC(分别为1.11×10–3S/cm和90.6 F/g).%With polyvinyl alcohol (PVA) and carboxyl-modified polyvinyl alcohol (CMPVA) being used as the polymer matrix, polyvinyl alcohol potassium borate (PVAPB) hydrogel electrolyte (HGE) and carboxyl-modified polyvinyl alcohol potassium borate (CMPVAPB) HGE were prepared on the surface of active carbon electrode by in situ electrodeposition, respectively. Structure, morphology, thermal stability and electrochemical performance of two kinds of HGEs were studied and compared. Results show that the two kinds of HGEs all possess stable chemical structure, and show good thermostability and excellent electrochemical performance. The CMPVAPB HGE has better compatibility with salt and higher salt concentration than PVAPB GPE. The ionic conductivity (1.23×10–3S/cm) and specific capacitance (94.9 F/g) of the supercapacitor (SC) assembled with CMPVAPB HGE is higher than that of the SC assembled with PVAPB HGE (1.11×10–3S/cm and 90.6 F/g).