锂离子纳米阵列电极材料的制备与电化学性能分析

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1、结构，不仅提高了电极材料本身的比表面积，而且为电子转移提供了有效通道，从而提高了电极材料的利用率，电子传输速率和锂离子扩散速率；同时N掺杂有效降低LitTi50-2的禁带宽度，使得更多电子在Li4TisOl2内部转移，导电性更强。在电流密度为10Ag-1时，对N-Li4Ti5012纳米线与N-Li4Tis012纳米管电极材料进行500次循环测试，N．Li4Ti5012纳米线与N．Li4Ti5012纳米管比电容分别下降了5．1％和1．6％，表示这两种电极材料均具有良好的电化学稳定性。关键词：磷酸铁锂；钛酸锂；纳米阵列；碳包覆：离子掺杂IIlAbstractAbs仃actWit

2、hthedevelopmentofhybridelectricvehicle，anditsdemandingofthehighenergydensityandhighpowerdensityofenergystoragedevices，lithium—ionhybridsupercapacitorsisbeingattentioninrecentyearsasanewtypeofenergystorageelement．Becauseusingbotlltheelectrodematerialoflithiumionbatteryandsupercapacitor,lith

3、ium-ionhybridsupercapacitorshavedualcharacteristicsofthelithiumionbatteryandsupercapacitor,andhasalargerenergydensitythanconventionalcapacitors，andthehigherpowerdensitythanlithiumionbaaery．Lithium—ionmixofsupercapacitorelectrodematerialcontainsbothchargeadsorptionactivityofhighspecificsurf

4、aceareaofthecapacitoractivematerial，andcanbereversibleembeddedoroffwithlithiumionbatterymaterialsofoxidation-reductionreaction．ItsenergystoredprocedurecontainsbothlithiumionsandtheelectrodematerialbodyofreversibleFaradaychemicalreaction，electrochemicalactivematerial，includingthereversibles

5、uctionstrippingprocess．111ispapermainlystudiedtheelectrodematerialoflithiumironphosphate(LiFeP04)andlithiumtitanate(Li4TisOl2)whicharethecompositionoflithium-ionhybridcapacitors．TheyhavethedefectsoflowelectricalconductivityandlowLi+diffusioncoefficient，whichrestrictsthemfromusingintherapid

6、chargeanddischargeelectricaldevices．Inthispaper,inordertoimprovetheelectricalconductivityofthelithiumionelectrodematerials，lithiumiondiffusioncoefficient,energydensityandcycleperformance，andthecriticalproblemishowtoke印thehighratecapacitanceoftheelectrodematerialsintherapidchargeanddischarg

7、eelectricaldevices．Ontheonehand，controllingthemorphologyandstructureoftheelectrodematerialssuchasnanoarrays，andontheotherhandthroughthemodifiedelectrodematerialitseIf,suchascarboncoating，iondopingaretheeffectivemethodstoimprovetheelectricalconductivityandlithi