Facile synthesis of NaV6O15 nanorods and its electrochemical behavior as cathode material in rechargeable lithium batteries

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1、ViewArticleOnline/JournalHomepage/TableofContentsforthisissuePAPERwww.rsc.org/materials

2、JournalofMaterialsChemistryFacilesynthesisofNaV6O15nanorodsanditselectrochemicalbehaviorascathodematerialinrechargeablelithiumbatteriesaabaaaHaimeiLiu,YonggangWang,LiangLi,KaixueWa

3、ng,EijiHosonoandHaoshenZhou*Received1stJuly2009,Accepted25thAugust2009FirstpublishedasanAdvanceArticleontheweb18thSeptember2009DOI:10.1039/b912906eAternaryvanadiumbronzecompound,NaV6O15(Na0.33V2O5),constructedbyhighlyorderednanorodstructures,wasfacilelysynthesizedviaa

4、lowtemperaturehydrothermalrouteusingV2O5,H2O2andNaClastheprecursors.Areactionmechanisminvolvedinpresenthydrothermalconditionwastentativelyproposed.Thesamplewassystemicallypost-treatedatdifferenttemperaturesandwellcharacterizedbyvarioustechniques.Itwasfoundthattheprepa

5、redNaV6O15nanorodshadahighlycrystallinedsinglephasewithapreferredc*orientationgrowth.Whenusedasthecathodematerialinrechargeablelithiumbatteries,theNaV6O15nanorodsexhibitedstablelithium-ioninsertion/deinsertionreversibilityanddeliveredashighas328mAhg1lithiumcycledatth

6、ecurrentdensityof0.02Ag1.Ingalvanostaticcyclingtest,aspecificdischargecapacityofaround300mAhg1couldbedemonstratedfor70cyclesunder0.05Ag1currentdensity.Accordingtoitsuniquecrystallographicstructureandelectrochemicalcharacteristics,itisthereforeexpectedthatas-prepared

7、NaV6O15nanorodsmaybeemployedascathodematerialinrechargeablelithium,sodium-basedbatteries.Introductionattentionastheyareknowntoexistinawiderangetheoxidationstatesfrom+2to+5,inwhichmorethanonelithiumioncanbeUndoubtedly,rechargeablelithium-basedbatteriesareoneoftheinsert

8、edintoahostvanadiumunit,andthushavetheimmensemostextensivelystudiedandattractiveresearchtopicsinbothpotentialtoprovidehigherspecificcapacities.Moreover,thescienceandtechnology,fromaworld-wideviewpointof3Eelectrodeperformanceofpurevanadiumoxidesweregreatly(Energy,Enviro

9、nment,Economy)revolution.1–3Tillnow,improvedbyadditionofalkalineoralkaline-earthmetalionsnumerouseffortshavebeenmadetodevelo