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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-Li_2SO4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-Li_2SO4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-Li_2SO4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。
Abstract：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-Li_2SO4 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-Li_2SO4 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-Li_2SO4 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.
[1] ZHONG C,DENG Y,HU W,et al.A review of electrolyte materials and compositions for electrochemical supercapacitors[J].Chemical Society Reviews,2015,44(21):7484-7539.
[2] SHOWN I,GANGULY A,CHEN L C,et al.Conducting polymer-based flexible supercapacitor[J].Energy Science&Engineering,2015,3(1):2-26.
[3] BEGUIN F,PRESSER V,BALDUCCI A,et al.Carbons and electrolytes for advanced supercapacitors[J].Advanced Materials,2014,26(14):2219-2251.
[4] PENG X,LIU H,YIN Q,et al.A zwitterionic gel electrolyte for efficient solid-state supercapacitors[J].Nature Communications,2016,7:11782-1-11782-8.
[5] WANG P,ZAKEERUDDIN S M,MOSER J E,et al.A stable quasi-solid-state dye-sensitized solar cell with an amphiphilic ruthenium sensitizer and polymer gel electrolyte[J].Nature Materials,2003,2(6):402-407.
[6] VERMA P,MAIRE P,NOVAK P,et al.A review of the features and analyses of the solid electrolyte interphase in Liion batteries[J].Electrochimica Acta,2010,55(22):6332-6341.
[7]吕晓静，朱平．超级电容器聚合物电解质的研究进展[J]．微纳电子技术，2016,53(2):102-107.
[8] LIU X,WU D,WANG H,et al.Self-recovering tough gel electrolyte with adjustable supercapacitor performance[J].Advanced Materials,2014,26(25):4370-4375.
[9] CHOUDHURY N A,SAMPATH S,SHUKLA A K,et al.Hydrogel-polymer electrolytes for electrochemical capacitors:an overview[J].Energy&Environmental Science,2009,2(1):55-67.
[10] STEPNIAK I,CISZEWSKI A.Electrochemical characteristics of a new electric double layer capacitor with acidic polymer hydrogel electrolyte[J].Electrochimica Acta,2011,56(5):2477-2482.
[11] WANG Z,TAO F,PAN Q,et al.A self-healable polyvinyl alcohol-based hydrogel electrolyte for smart electrochemical capacitors[J].Journal of Materials Chemistry:A,2016,4(45):17732-17739.
[12] RAJESWARI N,SELVASEKARAPANDIAN S,KARTHIKEYAN S,et al.Structural,vibrational,thermal,and electrical properties of PVA/PVP biodegradable polymer blend electrolyte with CH3COONH4[J].Ionics,2013,19(8):1105-1113.
[13] FEI H,YANG C,BAO H,et al.Flexible all-solid-state supercapacitors based on graphene/carbon black nanoparticle film electrodes and cross-linked poly(vinyl alcohol)-H2SO4porous gel electrolytes[J].Journal of Power Sources,2014,266:488-495.
[14] LU N,ZHANG X,NA R,et al.High performance electrospun Li+-functionalized sulfonated poly(ether ether ketone）/PVA based nanocomposite gel polymer electrolyte for solidstate electric double layer capacitors[J].Journal of Colloid and Interface Science,2019,534:672-682.
[15] YU H,WU J,FAN L,et al.A study of supercapacitor by using PVA-KOH-KSCN polymer gel electrolyte[J].Journal of Xiamen University(Natural Science),2011,50(1):109-112.
[16] KADIR M F Z,MAJID S R,AROF A K,et al.Plasticized chitosan-PVA blend polymer electrolyte based proton battery[J].Electrochimica Acta,2010,55(4):1475-1482.
[17] BOSCHLOO G,HAGFELDT A.Characteristics of the iodide/triiodide redox mediator in dye-sensitized solar cells[J].Accounts of Chemical Research,2009,42(11):1819-1826.
[18] YANG C,CHEN C,PAN Y,et al.Flexible highly specific capacitance aerogel electrodes based on cellulose nanofibers,carbon nanotubes and polyaniline[J].Electrochimica Acta,2015,182:264-271.
[19] ROLDAN S,BARREDA D,GRANDA M,et al.An approach to classification and capacitance expressions in electrochemical capacitors technology[J].Physical Chemistry Chemical Physics,2015,17(2):1084-1092.
[20] ZHANG J,JIANG J,LI H,et al.A high-performance asymmetric supercapacitor fabricated with graphene-based electrodes[J].Energy&Environmental Science,2011,4(10):4009-4015.
基本信息:
DOI：10.13250/j.cnki.wndz.2020.08.004
中图分类号:TM53
引用信息:
[1]张超蕊,张文磊,李廷鱼,等.基于PVA-Li_2SO_4-LiI聚合物凝胶电解质的制备及电化学性能[J].微纳电子技术,2020,57(08):617-622+673.DOI:10.13250/j.cnki.wndz.2020.08.004.
基金信息:
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)
2020-07-24
2020-07-24