层状结构LiMn_(1-x)Cr_xO_2材料合成电化学性能研究

电化学（中英文） ›› 2004, Vol. 10 ›› Issue (3): 324-329.

层状结构LiMn_(1-x)Cr_xO_2材料合成电化学性能研究

肖婕,詹晖,周运鸿

武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院湖北武汉430072 ,湖北武汉430072 ,湖北武汉430072

收稿日期:2004-08-28 修回日期:2004-08-28 出版日期:2004-08-28 发布日期:2004-08-28

Synthesis and Electrochemical Behavior of Layered-structure LiMn_(1-x)Cr_xO_2

XIAO Jie, ZHAN Hui, ZHOU Yun-hong~

(*) (College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China

Received:2004-08-28 Revised:2004-08-28 Published:2004-08-28 Online:2004-08-28

摘要/Abstract

摘要： 　应用流变相法合成掺Cr层状结构锂锰氧化物.XRD分析显示,掺Cr后的锂锰氧化物为单斜晶系(Monoclinic)的层状化合物,而未掺Cr的产物结构则属斜方晶系(Orthorhombic).TEM观测表明,以上两种产物的颗粒都非常细小,直径在60300nm之间,呈球形,且分布均匀.作为锂离子电池正极材料,掺Cr产物的初始容量(>180mAh·g-1)远大于未掺杂的,室温下以50mA·g-1的速率充放40周后仍可保持94%的容量.电化学测试表明,掺Cr的锂锰氧化物能抑制层状结构进一步向尖晶石相转变,从而使其循环能够稳定在2.04.4V范围内.

关键词: 锂离子电池, LiMn1-xCrxO2, 流变相法, 掺杂

Abstract: The Layered-structure LiMn_(1-x)Cr_xO_(2 )(x=0,0.15) solid solution has been prepared by the rheological phase method. From the XRD results, undoped LiMnO_(2) crystallized almost entirely in the orthorhombic phase while the structure of LiMn_(0.85)Cr_(0.15)O_(2) belongs to monoclinic phase. TEM investigation shows that the final powder product consists of ultrafine spherical particles which are distributed homogeneously, with the average diameter ranging from 60 to 300nm. The initial discharge capacity of LiMn_(0.85)Cr_(0.15)O_(2) is much higher than that of undoped LiMnO_(2). After 40 cycles, the capacity retention for m-LiMn_(0.85)Cr_(0.15)O_(2 )is 94% at the current rate of 50mA/g under room temperature. The results of electrochemistry tests reflect that the doping of Cr can inhibit the further layer-to-spinel transition. Thus, stable cycling could be achieved between voltage limit of 2.0~4.4 V vs. Li/Li~(+) at room temperature.

Key words: Lithium-ion batteries, LiMn_(1-x)Cr_(x), Rheological phase method, Cation dopant

中图分类号:

TM911

肖婕,詹晖,周运鸿. 层状结构LiMn_(1-x)Cr_xO_2材料合成电化学性能研究[J]. 电化学（中英文）, 2004, 10(3): 324-329.

XIAO Jie, ZHAN Hui, ZHOU Yun-hong~. Synthesis and Electrochemical Behavior of Layered-structure LiMn_(1-x)Cr_xO_2[J]. Journal of Electrochemistry, 2004, 10(3): 324-329.

导出引用管理器 EndNote|Ris|BibTeX

链接本文: https://electrochem.xmu.edu.cn/CN/

https://electrochem.xmu.edu.cn/CN/Y2004/V10/I3/324

参考文献

[1]　XiaYongyao,ZhouYunhong,YoshioMasaki.Capacityfadingoncyclingof4VLi/LiMn2O4[J].J.Electrochem.Soc.,1997,144:25932600. [2]　ArmstrongAR,BrucePG.SynthesisoflayeredLiMnO2asanelectrodeforrechargeablelithiumbatteries[J].Nature,1996,381:499～500. [3]　TabuchiMitsuharu,AdoKazuaki,KobayashiHironori,etal.SynthesisofLiMnO2withα NaFeO2 typestructurebyamixed alkalinehydrothermalreaction[J].J.Electrochem.Soc.,1998,145:4L49～4L52. [4]　AmmundsenB,DesilverstroJ,GroutsoT,etal.FormationandstructuralpropertiesoflayeredLiMnO2cathodematerials[J].J.Electrochem.Soc.,2000,147:114078～114082. [5]　Reed.J,CederG,VanDerVenA.Layered to spinelphasetransitioninLixMnO2[J].Electrochem.SolidStateLett.,2001,4:6A78～6A81. [6]　MishraSK,CederG.Structuralstabilityoflithiummanganeseoxides[J\〗.AmericanPhys.Soc.,1999,59:96120～96130. [7]　ArmstrongAR,RobertsonAD,GitsendannerR,etal.ThelayeredintercalationcompoundsLi(Mn1 yCoy)O2:positiveelectrodematerialsforlithium ionbatteries[J].J.SolidStateChem.,1999,145:549～556. [8]　GuoZP,ZhongS,WangGX,etal.Synthesisoflayered structureLiMn1-xCrxO2bythepechinimethodandcharacterizationasacathodeforrechargeableLi/LiMnO2cells[J].J.Electrochem.Soc.,2002,149:6A792～6A795. [9]　JangY Il,HuangBiying,ChiangY M,etal.StabilizationofLiMnO2intheα NaFeO2structuraltypebyLiAlO2addition[J].Electrochem.andSolidStateLett.,1998,1:113～116. [10]QiangWu,XueliLi,ManmingYan,etal.Electrochemicalpropertiesofsubmicro sizedlayeredLiNi0.5Mn0.5O2[J].ElectrochemistryCommunications,2003,5:878～882. [11]　ZhonghuaLu,J.R..DahnTheeffectofCosubstitutionforNionthestructureandelectrochemicalbehaviorofT2andO2structureLi2/3[CoxNi1/3-xMn2/3]O2[J].J.Electrochem.Soc.,2001,148(3)A237～A240. [12]　SunJ,YuanL,ZhangK,etal.Synthesisandthermaldecompositionofzincphthalate[J].ThermochimicaActa,2000,343:105～109. [13]　SunJ,XieW,YuanL,etal.PreparationandluminescencepropertiesofTb3+ dopedZincsalicylates[J].MaterialsScience＆EngineeringB,1999,B64:157～160. [14]　HuangF,ZhanH,ZhouY.Studiesofnano sizedCo3O4asanodematerialsforlithium ionbatteries[J].ChineseJournalofChemistry,2003,21:1275～1279 [15]　XiaoJ,ZhanH,ZhouY.SynthesisofLayered StructureLiMn1-xCrxO2forLithium ionBatteriesbytheRheologicalPhaseMethod[J].Mater.Lett.,2004,58(13～14):1620～1624.