摘要
通过选择性溶解法制备了多孔结构的聚乙烯醇(PVA)基大分子羧甲基纤维素(CMC)复合凝胶电解质,以此提高凝胶电解质的离子电导率和柔性超级电容器的电化学性能。使用扫描电子显微镜(SEM)对凝胶电解质的形貌进行了表征。凝胶内部为多孔的网络结构,不规则的孔均匀分布在PVA基体中。同时,采用活性炭作为电极组装成柔性超级电容器。对凝胶电解质的离子电导率、吸水率和热稳定性进行了测试,实验结果表明多孔PVA-10%CMC复合凝胶电解质离子电导率最高可达64.3 mS/cm,具有130.3%的吸水率和63.8%的保水率,并且在-10、25和40℃温度梯度下可以稳定使用。此外,利用其组装的柔性超级电容器的比电容最高可达40.0 F/g,循环10000圈后的比电容保持率为55%,并且有优异的倍率性能和弯曲性能。因此,多孔结构的构建和CMC的复合是提高凝胶电解质性能的有效方法。
Porous structured polyvinyl alcohol(PVA)-based macromolecular carboxymethyl cellulose(CMC)composite gel electrolytes were prepared by the selective dissolution method to improve the ionic conductivity of the gel electrolytes and the electrochemical performance of flexible supercapacitors.The morphology of the gel electrolyte was characterized using the scanning electron microscope(SEM).The interior of the gel is a porous network structure with irregular pores uniformly distributed in the PVA matrix.Meanwhile,activated carbon was used as the electrode to assemble the flexible supercapacitor.The ionic conductivity,water absorption and thermal stability of the gel electrolyte were tested.The experimental results show that the maximum ionic conductivity of the porous PVA-10%CMC composite gel electrolyte can be 64.3 mS/cm,and it has 130.3%water absorption and 63.8%water retention,and can be used stably under the temperature gradients of-10,25 and 40℃.In addition,the flexible supercapacitor assembled using it has a highest specific capacitance of 40.0 F/g,a specific capacitance retention rate of 55%after 10000 cycles,and excellent rate capability and bending performance.Therefore,the construction of the porous structure and the composite of CMC are effective methods to improve the performance of gel electrolytes.
作者
田帆飞
张果丽
贾晓霞
李刚
王开鹰
Tian Fanfei;Zhang Guoli;Jia Xiaoxia;Li Gang;Wang Kaiying(Institute of Energy Revolution Innovation,College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《微纳电子技术》
CAS
北大核心
2023年第9期1376-1385,共10页
Micronanoelectronic Technology
基金
山西省自然科学基金(20210302124334,20210302124421)。
