用于柔性超级电容器的凝胶聚合物电解质膜的制备

Preparation of Hydrogel Polymer Electrolyte Membrane for Flexible Supercapacitors

以聚乙烯吡咯烷酮(PVP)提高戊二醛(GA)交联的聚乙烯醇(PVA)凝胶在1mol/L的H2SO4溶液中的溶胀度,制备出一种用于柔性超级电容器的凝胶聚合物电解质膜,并对该电解质膜的结构、形貌、溶胀度、力学性能和电导率等进行了表征。在此基础上,组装了一种基于石墨烯电极的柔性超级电容器。结果表明:随着PVP用量的增加,膜孔数量增多且孔径增大,溶胀度增加,电导率提高,但力学强度下降。电解质膜中PVP质量分数为20%时,所组装的柔性超级电容器的比电容为111F/g,其电化学性能的温度依赖性较低,稳定性较好。

Hydrogel polymer electrolyte membrane for flexible supercapacitors were prepared using poly vinyl alcohol （PVA） and glutaraldehyde （GA）,in which poly （N-vinyl 2 pyrrolidone） （PVP） was added to enhance the swelling ratio of prepared electrolyte membranes in 1 mol/L H2SO4. The structure,morpho logy, swelling ratio,mechanical property and ionic conductivity of the electrolyte membranes were characterized. The flexible supercapacitors were assembled using prepared electrolyte membranes and graphene paper electrodes. Results show that the tensile strength decrease while the density and size of pores, the swelling ratio and ionic conductivity of the hydrogel electrolyte membranes increase with the increasing of PVP content. When the mass fraction of PVP is 20% in electrolyte membrane, the specific capacitance of flexible supercapacitors is 111 F/g, which shows low dependence of electrochemical performances on temperature and good stability.