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ID:31989986
大小:16.57 MB
页数:80页
时间:2019-01-30
《锂硫电池碳—硫复合材料中碳载体的杂化纳米结构设计和氮掺杂改性-研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、万方数据关键词:锂硫电池;碳一硫复合材料;碳载体;杂化纳米结构;氮原子掺杂分类号:TM911万方数据ResearchonhybridnanostructuredesignandNdopinglo⋯■·-’‘^一一一moOiIlcationintllecarbonmatrixOtcarbon-sulfurmaterialsforlithium..sulfurbatteriesIorlitliUlluratterles-Abstract:Recently,lithium—sulfurbatteriesasthepromis
2、ingofnext·-generationhigh··energyrechargeablebatterieshavedrawnmoreandmoreattentionintheworld.Amongthecathodematerialsfor1ithium—sulfurbatteries,carbon—sulfurmaterialsarethemostattractive.inwhichgreatachievementhasbeenmade.Ⅵmile.beforefuUutilizationofcarbon-sulf
3、urmaterialsastheparticalcathodematerials.therearestillseveralissuesneededtobeaddressed.suchasthehighsolubilityofpolysulfidesintermediatesintheelectrolyte.theless.than.idealelectrochemicalperformanceunderhigh.rateconditions.andthelOWsulfurcontentinthecomposites.A
4、imingatthoseproblemsabove.supportedbytheNationalNatureScienceFoundationofChina(51274240and51204209),wecarriedoutsomeresearchworksintermsofthecarbon—sulfurmaterialsthroughhybridnanostructuredesignandNdopingmodificationinthecarbonmatrix,andsomeprogresshasbeenobtai
5、ned.Themainworksandresultsaresummarizedasfollows:(1)Toaddressthedissolutionofpolysulfidesinporouscarbon—sulfurcomposites,thecarbonmatrixwithhybridnanostructureformedbygraphene(RGO)andmesoporouscarbon(CMK一3)wasdesigned,andtheRG0@CMK一3/Scompositewassuccessfullysyn
6、thesized.TheRGOskincoatedonthesurfaceofCMK.3/Scannotonlyimproveconductiveofthecomposite,butalsocanimplantchemicalandphysicalbarriersincathodeforabsorbingpolysulfides.Asthetestsshowed,theRGO@CMK一3/Scompositedisplaysareversibledischargecapacityofabout734mAhg~after
7、100cyclesat0.5C.(2)Toimprovethehigh—ratecyclingperformanceofcarbon—sulfurmaterials.thecarbonmatrixwiththree.dimensionalhybridnanostructurecomposedbyMWCNTswebs(MWCNTs一、聊andRGO,andtheRGO(萄MWCNTs-W/Scompositewassuccessfullysynthesized.AfteractivationwithKOHunderhig
8、htemperature.thesurfaceofMWCNTsbecamerough.Moreover,someoxygen—containingfunctiongroupswerecreatedonthesurfaceofMWCNTs.whichwouldbehelpfulTV万方数据forthefinedistribution
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