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Studyonthepreparation,characterizationandperformanceof

+

NASICON-typeNaexchangeMaterials

ZHUChao-liang1,2,DENGXiao-chuan1,XIAJi-ping1,2,ZHUZeng-hu1,2

(1.QinghaiInstituteofSaltLakes,ChineseAcademyofScience,Xining810008,China;

2.GraduateSchoolofChineseAcademyofSciences,Beijing100049,China)

Abstract:TwoseriesofNASICON-typefunctionalmaterialsofLi1.4M0.4Ti1.6(PO4)3(M=Al,Cr)werepre-paredbytwo-stephightemperaturesolid-phasereaction.ThedopedsampleswerecharacterizedbyX-raydif-+

fraction(XRD)andscanningelectronmicroscope(SEM),andtheNaadsorptioncapacityweremensuratedre-3+3+

spectively.TheresultsshowedthatproperconcentrationdopingofAlandCrdidnotchangethecrystalstructureoftheLiTi2(PO4)3.Theparticlesizeofsynthesizedadsorbentdistributein5to10 m.Li1.4M0.4Ti1.6(PO4)3(M=Al,Cr)havespecialeffectsontheadsorptionofNa+,whenpHvalueis11.0,thesaturatedad-sorptioncapacityofLi1.4Al0.2Cr0.2Ti1.6(PO4)3canbeupto69.26mg/g.Keywords:NASICON;Li1.4M0.4Ti1.6(PO4)3;solid-phasesynthesis;ionexchange(上接第952页)

ResearchofLiFePO4withtwocarbondopingsteps

forcathodematerialoflithium-ionbattery

TANGYing-cai1,2,XUEWei-dong1,2

(1.SchoolofMicroelectronicsandSolidStateElectronics,UniversityofElectronicScienceand

TechnologyofChina,Chengdu610054,China;

2.StateKeyLaboratoryofElectronicThinFilmsandIntegratedDevices,UniversityofElectronicScienceand

TechnologyofChina,Chengdu610054,China)

Abstract:AsyntheticmethodofLiFePO4/Ccompositeusedasthecathodematerialinlithiumionbatterywaspresentedinthispaperbytwocarbondopingsteps.TheexperimentalresultsverifiedthattheC-dopingatdif-ferentstageshasnoeffectoncrystalformofLiFePO4/Ccompositeandcleareffectonelectrochemicalperform-ances.Thecarbondopingbytwostepscanenhancethecapacityandimprovethestabilityofcathodematerialobviously.Asthe3wt%carbondopedinlithiumironphosphatebyinducingsaccharose,thepowderswithsmallersizewerepreparedsuccessfullyandthesamplepossessedexcellentelectrochemicalperforms.Theinit-i

atecapacityandspecificcapacityafter20cyclesofLiFePO4/0.2Ccompositewere161.19and153.68mAh/gre-spectively.

Keywords:lithiumionbattery;athodematerial;lithiumironphosphate;twocarbondopingstep