CNT-Supercapacitor-TechnologyAndMarket.pdf

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1、CarbonNanotube-BasedSupercapacitors:TechnologiesandMarketsJ.M.BOYEA,R.E.CAMACHO,∗S.P.TURANOandW.J.READYABSTRACT:Electrochemicaldouble-layercapacitors(alsoknownas“supercapacitors”or“ultracapacitors”)havetremendouspotentialashigh-energyandhigh-powersourcesforuseinlowweighthybridsystems.Comm

2、ercialapplicationsforsuchdevicesincludeuninterruptiblepowerapplications,telecommunications,andpublictransportation.Electrodesbasedoncarbonnanotubes(CNTs)offerexceptionalpowerandenergyperformanceduetothehighsurfacearea,highconductivity,andtheabilitytofunctionalizetheCNTstooptimizecapacitor

3、properties.Inthisarticle,ateamofresearchersatGeorgiaTechResearchInstitutereportonthepreparationofelectrochemicalcapacitorsincorporatingCNTelectrodesandtheirperformancecomparedwithexistingcommercialtechnology.Preliminaryresultsindicatethatsubstantialincreasesinbothpowerandenergydensityarep

4、ossiblewithfurtherdevelopment.Theauthorsdiscusstheeffectsofnanotubegrowthandprocessingmethods,includingpurificationandfunctionalization,onelectrochemicalcapacitorperformance.Finally,theauthorsreviewthecompatibilityofdifferentCNTsandelectrolytesbysummarizingresearchfocusedonvaryingthetypeo

5、felectrolyteionsthataccumulateonthehighsurfaceareaelectrodes.I.INTRODUCTIONhelateNobelLaureateRichardSmalleywasastrongproponentofthebenefitsofTnanotechnologytoovercomeglobalenergydilemmas.Energystoragedevicesareclassifiedaccordingtoenergyandpowerdensity.Powerdensityisrelatedtothe“strength

6、”(wattage)ofagivencurrentandvoltagecombination,whileenergydensityisrelatedtothedurationoftimethatwattagecanbeapplied.Electrochemicaldoublelayer(ECDL)capacitors(alsoabbreviatedEDLC),commonlycalled“supercapacitors”or“ultracapacitors”areintermediatesystemsthatbridgethepower/energygap1between

7、traditionaldielectriccapacitors(highpower)andbatteries(highenergy).∗GeorgiaTechResearchInstitute,Atlanta,GA30332-0826.Thisworkwasfundedin-partbytheU.S.ArmySpaceandMissileDefenseCommand(Contract#DASG60-03-1-0004),andNASA(Contract#NNJ05HA25GandNNJ06HE48G).APresident’s