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《鋰離子電池錫基負(fù)極材料的制備與改性研究》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在教育資源-天天文庫(kù)。
1、AbstractThegraphitematerialsthatwasusedascommonlycommercializedanodeinlithiumionbatteryhasalreadyapproacheditstheoreticalcapacityof372mAh/g,whichcan'tmeettherequirementsofhighcapacity.Therefore,tin-basedmaterialshaveattractedgreatinterestinrecentyearsowningtotheirhightheoretical
2、capacity(992mAh/g).However,themostimportantproblemintin-basedanodesisitspoorcyclabilityduetolargevolumechangeduringthecharge-dischargeprocess.Toovercomethisproblem,inthisworkweaddcarbonnanotubes(CNT)intothealloymaterialsandprepareporousstructuretoimprovethecycleperformanceoftin-
3、basedmaterials,theresearchworkandresultsaregivenasfollowing:TheSn-Cualloy-CNTcompositewerepreparedbyanelectrodepositionprocess.(1)AddingwelldispersedCNT(lengh<2μm)solutiontotheplatingsolution,Sn-Cualloy-CNTcompositewasobtained.XRDresultsshowedthattheelectrodepositedSn-Cualloy-CN
4、TcompositeconsistsmainlyofCu6Sn5、CNTandCu3Snphase.ElectrochemicaltestsindicatedthatthecycleperformanceofSn-Cualloy-CNTelectrodeisbetterthanthatofSn-Cuelectrode.(2)Addingcarbonnanotubespowders(lengh>2μm)whichneedtreatmentpreviouslytotheplatingsolution,theSn-Cualloy-CNTcompositewa
5、salsoobtained.XRDresultsshowedthattheelectrodepositedSn-Cualloy-CNTcompositeconsistsmainlyofCu6Sn5andasmallamountofSnphase.ElectrochemicaltestindicatedthatthecycleperformanceofSn-Cualloy-CNTelectrodehasbeenimprovedbycomparrionwithSn-Cualloy.SEMimagesshowedthatcarbonnanotubesarei
6、ntertwinedintomeshstructure,theSn-CualloyparticlesweredepositdontheCNTs.TheSn-Coalloy-CNTcompositewerepreparedbyanelectrodepositionprocess.(1)AddingwelldispersedCNT(lengh<2μm)solutionanddifferentconcentrationsofhexadecyltrimethylammoniumbromide(CTAB)totheplatingsolution,Sn-Coall
7、oy-CNTcompositewasobtainedthroughelectrodeposition,thecycleperformanceofSn-Coalloy-CNTelectrodeisimprovedbycomparisionwithSn-Coalloy.(2)Addingcarbonnanotubespowders(lengh>2μm)whichneedtreatmentpreviouslytotheplatingsolution,Sn-Coalloy-CNTcompositewasobtainedthroughelectrodeposit
8、ion.ElectrochemicaltestsindicatedthatthechargeI
