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时间:2020-03-26
《双电层电容器电化学阻抗谱的实验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学报(WuliHuaxueXuebao)NovemberActaP.一Chim.Sin.2014,30(11),2071-20762071【Article】doi:10.3866/PKU.WHXB201408292WWW.whxb.pku.edu.cn双电层电容器电化学阻抗谱的实验研究孙现众t黄博张熊张大成张海涛马衍伟f中国科学院电工研究所应用超导重点实验室,北京100190)摘要:电化学阻抗谱(EIS)是一种很有用的研究电化学性能的技术.理想的双电层电容器(EDLc)阻抗谱的尼奎斯特图由中高频的45。线和低频的与实轴垂直的直线组成,可以用孔径分布一传输线模型来解释.然而,
2、在研究工作中还发现,在阻抗谱的高频区出现了半圆弧区域,为此,提出的等效模型认为半圆弧可以归因于活性材料之间的接触电阻和接触电容,以及电极与集流体之间的接触电阻与接触电容.还研究了充电过程、活性炭和电解液的电导率、导电添加剂和粘结剂的含量、隔膜、活性物质附载量和极片加压等因素对阻抗谱的影响.其中,充电截止电压、活性炭的电导率、导电添加剂的含量和极片加压对半圆弧部分影响较为显著.关键词:电化学阻抗谱:双电层电容器:活性炭:接触电阻:接触电容中图分类号:0646ExperimentalInvestigationofElectrochemicalImpedanceSpectroScopyo
3、fElectricalDoubleLayerCapacitorSUNXian-ZhongHUANGBoZHANGXiongZHANGDa—ChengZHANGHai.TaOMAYan.Wei(KeyLaboratoryofAppliedSuperconductivity,InstituteofElectricalEngineering,ChineseAcademyofSciencesBeo'ing100190,户R.China1Abstract:Electrochemicalimpedancespectroscopy(EIS)isaveryusefultechniqueforstu
4、dyingelectrochemicalbehavior.TheidealNyquistplotofelectrochemicaIimpedancespectroscopyforanelectricaIdouble-layercapacitor(EDLC)consistsofa45。lineinthehigh-middlefrequencyregionandaverticallineintheIOWfrequencyregion,whichcanbeexplainedbythetransmissionIinemode1withporesizedistribution.However
5、,asemicircleloopinthehighfrequencyregionhasbeenfoundinmanystudies.Hence,inthisstudy,anequivalentmodeliSproposed,inwhichthesemicircleloopisascribedtothecontactresistanceandcontactcapacitancebetweenparticlesofactivatematerials,andbetweentheactivatedcarbonfAC)electrodeandcurrentcollector.Theefect
6、softhechargingprocess,conductivitiesoftheactivemateriaIandelectrolyte.contentofconductiveadditiveandbinder,porousseparator,massloading,andexertedpressuretotheelectrodeontheEISspectraofEDLCswereexperimentallyinvestigated.Amongtheseefects,themostsignificantfactorswerethechargingcut-ofvoltage,con
7、ductivityofactivatedcarbon,contentofconductiveadditive,andexertedpressure.KeyWords:Electrochemicalimpedancespectroscopy;Electricaldoublelayercapacitor;Activatedcarbon;Contactresistance;ContactcapacitanceReceived:July28,2014;Revised:Augu
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