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1、ActaChim.Sinica修改稿高密度非球形和球形LiNi1/3Mn1/3Co1/3O2的合成和性能比较常照荣1,2,陈中军1，吴锋2,汤宏伟1,朱志红1,上官恩波1(1.河南师范大学化学与环境科学学院，河南新乡453007；2.北京理工大学化工与环境工程学院,北京100080)摘要:利用二次干燥法和共沉淀法分别制备出了非球形的Ni1/3Co1/3Mn1/3OOH前驱体和球形Ni1/3Co1/3Mn1/3(OH)2前驱体，并分别和LiNO3混合烧结合成高密度非球形和球形的锂离子正极材料Li(Ni1/3Co1/3Mn1/3)O2。XPS分析表明，二次干燥法制备
2、的非球形Ni1/3Co1/3Mn1/3OOH前驱体其过渡金属Ni,Co和Mn的价态分别是2+,3+and4+，而共沉淀法制备的球形Ni1/3Co1/3Mn1/3(OH)2前驱体其各金属价态为2+；X射线衍射分析表明，非球形的Ni1/3Co1/3Mn1/3OOH前驱体比球形的前驱体具有较高的活性，能够在低温下合成出Li(Ni1/3Co1/3Mn1/3)O2，而且制备的产物结晶度高，具有规整的层状α-NaFeO2结构，扫描电镜显示制备的非球形产物颗粒均匀，颗粒间隙小，振实密度高达2.95g/cm3，远高于球形的振实密度2.35g/cm3；充放电实验表明，由非球形前驱
3、体制备的Li(Ni1/3Co1/3Mn1/3)O2其充放电性能和循环性能以及体积比容量均高于球形正极材料。关键词：锂离子电池；正极材料；LiNi1/3Mn1/3Co1/3O2；高密度中图分类号：0614;0646;TM912.9文献标识码：APerformanceComparisonofSphericalLiNi1/3Co1/3Mn1/3O2PreparedfromthePrecursorwithMetalIonsofDifferentValencesCHANGZhao-Rong1,2CHENZhong-Jun1WUFeng2，TANGHong-Wei1ZHUZ
4、hi-Hong1(1.CollegeofChemistryandEnvironmentalScience,HenanNormalUniversity,Xinxiang453007，HenanProvince,P.R.China2.CollegeofChemicalEngineeringandEnvironmental,BeijingInstituteofTechnology,Beijing100080,P.R.China)Abstract:Non-sphericalNi1/3Co1/3Mn1/3OOHandsphericalNi1/3Co1/3Mn1/3(OH)
5、2precursorpowdersweresynthesizedusingtwostepsdryingmethodandco-precipitationmethod,respectively.Andthenhightap-densitynon-sphericalandsphericalLi(Ni1/3Co1/3Mn1/3)O2powderswerepreparedbytheirprecursor,whichweresinteredwithLiNO3.XPSstudiesindicatedthatthepredominantoxidationstatesofNi,
6、CoandMninthenon-sphericalprecursorwere2+,3+and4+,respectively.However,thepredominantoxidationstatesofNi,CoandMninthesphericalprecursorwere2+.AndtheXRDstudiesshowedthattheactivityofnon-sphericalNi1/3Co1/3Mn1/3OOHishigherthanthatofsphericalNi1/3Co1/3Mn1/3(OH)2,furthermore,thenon-spheri
7、calLi(Ni1/3Co1/3Mn1/3)O2canbesynthesizedatlowtemperature,whichhadawell-orderedlayeredα-NaFeO2structurewithsmallamountofcationmixture.SEMshowedthatthesynthesizednonsphericalparticlesinsizeareuniform.Thetap-densityisupto2.95g/cm3,whichishigherthanthatofsphericalpowders(2.35g/cm3).Charg
8、eanddischarg
