Carbon-coated grapheneCr2O3 composites with enhanced electrochemical performances for Li-ion batter
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Graphene-basedCr2O3compositesarepreparedandexhibitbetterelectrochemicalpropertiesthanfreeCr2O3particleswithoutthegraphene.ThesynthesisprocedureconsistsofthedirectgrowthofCrOOHonthesurfaceofgrapheneandthesubsequentthermaldecompositionofCrOOHtoCr2O3.Moreover,theelectrochemicalpropertiesofgraphene-basedCr2O3arefurtherimprovedthroughcarboncoating,andtwostrategiesaredeveloped.Interestingly,thecarbonlayerspyrolyzedfromglucoseonCrOOHcanseparatetheparticlesonthegrapheneandlimittheirgrowth,whilethoseonCr2O3merelycovertheparticlesandcannotpreventparticleaggregation.Consequently,comparedtothelattercarbon-coatedcomposite,theformershowsfurtherimprovedelectrochemicalbehavior.
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