基于PVA-Li2SO4-LiI聚合物凝胶电解质的制备及电化学性能  

Preparation and Electrochemical Performance of the Polymer Gel Electrolyte Based on PVA-LiSO-LiI

作　　者：张超蕊 张文磊 李廷鱼 郭丽芳 李刚 Zhang Chaorui;Zhang Wenlei;Li Tingyu;Guo Lifang;Li Gang(Micro-Nano System Research Center,College of Information and Computer,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学信息与计算机学院微纳系统研究中心,太原030024

出　　处：《微纳电子技术》2020年第8期617-622,673,共7页Micronanoelectronic Technology

基　　金：国家自然科学基金资助项目(61674113);山西省自然科学基金资助项目(201901D111099);山西省高校科技创新研究项目(2016138)。

摘　　要：凝胶电解质因兼具液体电解质和固体电解质的优势而备受关注,然而有限的离子电导率和比电容制约了其实际应用。在制备PVA-Li2SO4聚合物凝胶电解质基础上,添加LiI作为其氧化还原剂和增塑剂,以提高凝胶电解质的离子电导率和比电容。同时,采用活性炭作为电极组装成双电层超级电容器。实验结果表明:通过引入氧化还原剂LiI,该聚合物凝胶电解质离子电导率最高可达3.08×10-2S/cm,相比PVA-Li2SO4聚合物凝胶电解质提高了约55.55%,所制备的超级电容器除具有良好的循环稳定性和机械性能外,在扫描速率为100 mV/s时,比电容高达214.46 F/g,相比PVA-Li2SO4聚合物凝胶电解质超级电容器,比电容提高约2倍。因此,引入氧化还原剂是提高凝胶电解质离子电导率和比电容的一种有效途径。With the advantages of liquid and solid electrolytes,gel electrolytes have attracted much attention.However,limited ionic conductivity and specific capacitance of the gel electrolytes limit their practical applications.Based on the preparation of the PVA-Li2SO4 polymer gel electrolyte,LiI was added as its redox agent and plasticizer to improve the ionic conductivity and specific capacitance of the gel electrolyte.Meanwhile,a double-electrode-layer supercapacitor was assembled with the activated carbon as the electrode.The experimental results show that by introducing the redox agent LiI,the ionic conductivity of the polymer gel electrolyte can be up to 3.08×10-2 S/cm,which is about 55.55%higher than that of the PVA-Li2SO4 polymer gel electrolyte.In addition to good cycle stability and mechanical properties,the prepared supercapacitor has a specific capacitance as high as 214.46 F/g at a scanning rate of 100 mV/s.The specific capacitance is improved about 2 times compared with that of the PVA-Li2SO4 polymer gel electrolyte supercapacitor.Therefore,the introduction of the redox agent is an effective way to improve the ionic conductivity and specific capacitance of the gel electrolytes.

关 键 词：超级电容器 聚乙烯醇 氧化还原反应 凝胶电解质 离子电导率 

分 类 号：TB333.23[一般工业技术—材料科学与工程]