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时间:2020-04-19
《钒替代对碳包覆硅酸铁锂复合材料结构的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第19卷第6期电化学VOl_19No.62013年12月JOURNALOFELECTROCHEMISTRYDec.20l3DOI:10.13208~.electrochem.130356ArticalID:1006—3471(2013)06—0565—06EffectofVanadiumSubstitutiononStructureofLi2FeSiOdCCompositesYANGHong,ZHANGYing,CHENGXuanr1.DepartmentofMaterialsScience&Engineering,Collegeo
2、fMaterials;2.FujianKeyLaboratoryofAdvancedMaterials,XiamenUniversity,Xiamen361005,Fujian,China)Abstract:Thecarboncoatedlithiumironsilicate(Li2FeSiOdC)compositeswerepreparedusinglessexpansiveironstartingmaterialofsolubleferricnitratethroughsol-gelprocessandsolidstaterea
3、ction.Thetheoreticallycalculatedamountsof5%,10%,15%,20%,25%,30%,and50%ofvanadium(V)wereintroducedusingNH4VO3toobtainV—substitutedLi2FeSiOdCcomposites.ItwasfoundthatthepureLi2FeSiOJCcompositeexhibitedagoodcrystallinitywith1andnearlynoimpuritiesbeingdetected,whiletheV—su
4、bstitutedLi2FeSiOdCcompositesshowedmajorimpuritiesofLi2Si03andV3O4/Fe304.Thedischargecapacitiesof160.9mAh·g-and130.8mAh·gatC/16wereobtainedforthepureand5%V-substitutedLi2FeSiO4/Ccomposites,respectively.Thedegreeofgraphitizationinamorphouscarbonwasenhancedandthequantiti
5、esofcarboncoatedwereloweredwiththeincreaseofV-substitutedamounts.Theelectrochemicalperformanceof5%V—substitutedLi2FeSiO4/CcompositewasnotimprovedduetothepresencesofimpuritieswhichweredirectlylinkedtotheamountsofVsubstitution.Keywords:lithiumironsilicates;vanadiumsubsti
6、tution;cathodematerials;lithiumionbakeryCLCNumber:0646DocumentCode:AThepolyanion—typecathodematerialofLi2FeSiO4alcationsincludingM,CuandZn2~旧,Un2+7-8],isconsideredasoneofthemostpromisingcathodeNi[9].orCr2+t0]inLi2FeSiO4hasbeenextensivelyin—materialsforlithiumionbaRerie
7、sbecauseofitsex—vestigated.However,vanadium(V)modificationsarecellentstructuralstability,goodreliabilityandhi1essstudied.DiversifiedvalencestatesofVanddifi—performancewithanominalcapacityof330mAh·gcultiesinidentificationsofVpresentedafterdop—upontwolithiumionsbeingextr
8、acted.However,lowing/substitutionleadtocomplexitiesandvarietiesofintrinsicelectricalconductivityandpoordischargeVexis
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