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MXenes基锂电负极的构筑及储能机制的研究.docx

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MXenes基锂电负极的构筑及储能机制的研究 Abstract: MXenes,anewtypeoftwo-dimensional(2D)material,hasattractedsignificantattentioninrecentyearsduetoitsuniquestructureandexcellentelectrochemicalproperties.Inthispaper,wefocusedontheconstructionandenergystoragemechanismofMXenes-basedlithium-ionbattery(LIB)anodes.First,weintroducedthesynthesismethodsandstructuralcharacteristicsofMXenes.Then,wediscussedthevariousstrategiesforconstructingMXenes-basedLIBanodes,includingMXenes/graphenecomposites,MXenes/carbonnanotubecomposites,andMXenes/otherconductivematerialscomposites.Subsequently,weexploredtheenergystoragemechanismofMXenes-basedLIBanodes,mainlyfocusingonthelithiumioninsertion/extractionprocessandtheeffectofsurfacefunctionalizationontheelectrochemicalperformance.Finally,wesummarizedthechallengesandfutureprospectsofMXenes-basedLIBanodes. 1.Introduction Lithium-ionbatteries(LIBs)havebeenwidelyusedinportableelectronicdevices,electricvehicles,andgridenergystorageduetotheirhighenergydensity,longcyclelife,andenvironmentalfriendliness.However,therapiddevelopmentoftheseapplicationsdemandshigherenergydensityandimprovedelectrochemicalperformanceofLIBs.Tomeettheserequirements,thedesignandconstructionofhigh-performancenegativeelectrodesiscrucial. MXenes,asanewclassof2Dmaterial,haveemergedaspromisingcandidatesforhigh-performanceLIBanodes.MXenesareproducedbyetchingtheAelementfromtheternaryMAXphasecompounds,resultinginthinlayerswithageneralformulaofM_n+1X_nT_x,whereMrepresentsthetransitionmetal,Xrepresentscarbonornitrogen,andTrepresentssurfaceterminationssuchashydroxyloroxygengroups.Duetotheiruniquestructureandexcellentconductivity,MXeneshavebeenextensivelyinvestigatedforenergystorageapplications. 2.SynthesisMethodsandStructuralCharacteristicsofMXenes ThesynthesisofMXenesmainlyinvolvestheexfoliationprocess,whichincludesetchingtheAelement,intercalatingwithasuitablesolvent,andexfoliatingthelayeredstructure.Variousetchingagents,suchashydrofluoricacid(HF),lithiumfluoride(LiF),andpotassiumhydroxide(KOH),havebe