类石墨烯类活性炭材料的简易合成及其在锂硫电池中的应用研究（英文）-豆柴文库

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类石墨烯类活性炭材料的简易合成及其在锂硫电池中的应用研究（英文）
SynthesisandApplicationofGraphene-LikeActivatedCarbonMaterialsinLithium-SulfurBatteries
Introduction:
Lithium-sulfur(Li-S)batterieshaveemergedaspromisingcandidatesfornext-generationenergy-storagesystemsduetotheirhightheoreticalenergydensityandlowcost.However,theirpracticalapplicationisstillhinderedbyseveralissues,suchasthepoorcyclingstability,limitedcapacity,andlowrateperformance.Toaddresstheseissues,variousstrategieshavebeenproposedandinvestigated,amongwhichtheuseofelectrodematerialswithhighspecificsurfaceareaandgoodelectricalconductivityhasbeenproveneffective.Therefore,inthisstudy,wefocusedonthesynthesisofgraphene-likeactivatedcarbonmaterialsandtheirapplicationinLi-Sbatteries,aimingtoenhancetheelectrochemicalperformanceofLi-Sbatteries.
Experimental:
Thegraphene-likeactivatedcarbonmaterialsweresynthesizedviaasimpletwo-stepprocess.Initially,commercialactivatedcarbonwastreatedwithpotassiumhydroxide(KOH)at800°Cunderanargonatmospherefor1hourtogeneratepotassium-treatedactivatedcarbon.Then,thismaterialwassubjectedtoachemicalvapordeposition(CVD)processat900°Cusingacetyleneasthecarbonsourcefor10minutestoobtainthegraphene-likeactivatedcarbonmaterials.Theobtainedmaterialswerecharacterizedbyscanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM),X-raydiffraction(XRD),andRamanspectroscopy.Fortheelectrochemicalcharacterization,Li-Scoincellswereassembledwiththegraphene-likeactivatedcarbonmaterialsasthecathode,puresulfurastheactivematerial,lithiummetalastheanode,andether-basedelectrolyte.
ResultsandDiscussion:
TheSEMandTEMimagesindicatedthatthesynthesizedmaterialshadagraphene-likemorphologywithahighlevelofporosity.TheXRDpatternshowedthatthesynthesizedmaterialshadabroaddiffractionpeakat25°,whichcorrespondedtothe(002)planeofcarbonmaterials.TheRamanspectrumexhibitedthecharacteristicpeaksofgraphiticcarbon,includingtheDbandaround1350cm-1andtheGbandaround1585cm-1,indicatingthesuccessfulsynthesisofgraphene-likeactivatedcarbonmaterials.
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