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铅碳超级电池混合负极的研究.docx

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铅碳超级电池混合负极的研究 Lead-CarbonHybridSupercapacitorNegativeElectrodeResearch Introduction Lead-acidbatteriesarewidelyusedduetotheirlowcostandhighreliability.However,theyhavelowenergydensityandcannotmeetthedemandforhigh-powerapplications.Supercapacitors,ontheotherhand,havehighpowerdensityandlongcyclelife,buttheirenergydensityislow.Therefore,alead-carbonhybridsupercapacitor(LCS)isproposedtocombinetheadvantagesofbothlead-acidbatteriesandsupercapacitors.ThispapermainlyfocusesontheresearchprogressofLCShybridnegativeelectrode. Stateoftheart ToprepareLCShybridnegativeelectrode,thecarbonmaterialisusuallyaddedintothenegativeelectrodeofthelead-acidbattery.Thecarbonmaterialcanprovideextrasurfaceareaforelectrochemicalreactionsandenhancethecharge/dischargeefficiencyofthebattery.Themostcommonlyusedcarbonmaterialsareactivatedcarbonandcarbonnanotubes.Activatedcarbonhasalargespecificsurfaceareaandgoodelectricalconductivity,whichissuitableforpreparingtheelectrodeofsupercapacitor.Carbonnanotubeshaveexcellentmechanical,electrical,andthermalproperties,whichcanimprovethemechanicalstrengthandthermalstabilityoftheelectrode.However,thepreparationofLCShybridnegativeelectrodeismorecomplexthantraditionallead-acidbatterynegativeelectrodes,andtheelectrochemicalperformanceoftheLCSsystemisaffectedbythepropertiesofthecarbonmaterialsadded. Researchprogress Inrecentyears,researchershavemadegreatprogressinthepreparationofLCShybridnegativeelectrodes.Thefollowingisabriefsummary: 1.Activatedcarbon-basednegativeelectrodes Zhangetal.(2011)reportedaLCShybridnegativeelectrodebasedonactivatedcarbon.Thenegativeelectrodewaspreparedbymixingactivatedcarbon,graphitepowder,andleadoxide(PbO2)together,followedbypressingandcuring.Theresultsshowedthattheadditionofactivatedcarboncouldenhancethespecificcapacitanceandcyclelifeofthebattery,andthehybridbatteryhadhigherenergydensityandpowerdensitythantraditionallead-acidbatteries. 2.Carbonnanotube-basednegativeelectrodes Zhangetal.(2013)investigatedtheeffectofcarbonnanotubesonthee