Monodisperse_Porous_LiFePO4_Microspheres_for_a_High_Power_Li-Ion_Battery_Cathode

《Monodisperse_Porous_LiFePO4_Microspheres_for_a_High_Power_Li-Ion_Battery_Cathode》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、COMMUNICATIONpubs.acs.org/JACSMonodispersePorousLiFePO4MicrospheresforaHighPowerLi-IonBatteryCathodeChunwenSun,ShreyasRajasekhara,JohnB.Goodenough,*andFengZhouTexasMaterialsInstitute,ETC9.184,UniversityofTexasatAustin,Austin,Texas78712,UnitedStatesbSSupportingInformationABSTRACT:Anovelsolvotherma

2、lapproachcombinedwithhigh-temperaturecalcinationswasdevelopedtosynthesizeonalargescaleLiFePO4microspheresconsistingofnanoplatesornanoparticleswithanopenthree-dimen-sional(3D)porousmicrostructure.Thesemicro/nano-structuredLiFePO4microsphereshaveahightapdensityand,aselectrodes,showexcellentratecapa

3、bilityandcyclestability.Inrecentyears,theorderedolivinelithiumironphosphate(LiFePO4)hasbeenextensivelyandintensivelystudiedasacathodematerialforpowerbatteriesinelectricvehicles(EVs).Itsadvantagesincludeahightheoreticalspecificcapacity-1(170mAhg),lowcost,environmentalcompatibility,and1intrinsicther

4、malsafety.However,therateperformanceoftheoriginalLiFePO4wassignificantlyrestrictedbysluggishkinetics2ofelectronandlithium-iontransport.TherateperformanceandcapacityofLiFePO4hasbeenimprovedbycoatingwithcarbonFigure1.RepresentiveSEMandTEMimagesoftheflowerlikeLiFe-orametallicconductinglayer,3bydopingw

5、ithisovalentions,4orPO4microspheres:(a)overallmorphologyoftheproducts;(b)high-5magnificationSEMimageofanindividualmicrosphere,revealingthereducingtheparticlesize.Variousmethodshavealsobeenconstituentdetailsofthemicrosphere;(c)overviewofanensembleofdevelopedtopreparenanostructuredLiFePO4particles,i

6、nclud-nanoplatesattheedgeofamicrospherecoatedwithcarbon;(d)67inghydrothermal/solvothermal,sol-gel,andhard-templatingHRTEMimageofawell-crystallizednanoplate(inset:theFFTpattern,8approaches.Althoughthedown-sizingstrategyiseffectiveforBdenotesthebeamdirection).improvingtheperformanceoftheelectrode,it

7、adverselyaffectsThephasepurityandcrystalstructureoftheproductsthetapdensityandvolumetricenergydensity.Generally,itisobtainedwereexaminedbyXRD.FigureS1(seeSupportingbelievedthatmicrosizedsphericalparticlescaneasilyformcl