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

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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