NASICON结构的锂离子导电微晶玻璃结构与电导率.pdf

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1、第28卷第9期无机化学学报VoI_28No．92012年9月CHINESEJOURNALOFINORGANICCHEMISTRY1935—1939NASICON结构的锂离子导电微晶玻璃结构与电导率何坤王衍行祖成奎刘永华马眷荣(中国建筑材料科学研究总院石英与特种玻璃研究院，北京100024)摘要：通过对¨Ge(P04)，=1．1—1．9)锂离子导电玻璃的差示量热扫描(DSC)数据，结合XRD及其Rietveld精修、FESEM和交流阻抗等测试方法，研究了该系微晶玻璃的物相组成、主晶相晶胞参数变化情况、微观结构形貌、锂离子电导率和电化学窗口等结果表明：Li

2、TAL一。Ge(PO4)=1．1～1．9)锂离子导电微晶玻璃析出导电主晶相为LiGe(P04)，。当=1．5时，由于导电主晶相LiGe2(P04)，晶粒充分长大、分布均匀，晶界清晰，LAGP导电微晶玻璃的室温电导率最高(可达5．3x10S·cn])，电化学窗口为7．2V，可以满足全固态锂离子电池对电解质高室温电导率和宽电化学窗口的应用要求。关键词：微晶玻璃；固体电解质；Rietveld精修；离子电导率中图分类号：0753．1；PM191文献标识码：A文章编号：1001—4861(2012)09—1935．05CrystalStructureandIon

3、icConductivityoftheNASICON-TypeLithiumIonConductingSolidElectrolyteHEKunWANGYan—HangZUCheng—KuiLIUYong-HuaMAJuan—Rong(InstituteofQuartzandecia!Glasses，ChinaBuildingM~eridsAcademy,Beijing100024China)Abstract：TheLixAlx一1Ge3(P04)3=1．1-1．9)solidsolutionswerepreparedasglassceramicspe

4、llets．ThetitlecompoundscrystallizeintheNASICON(NaSuperIonicConductor)，R3ctypestructure，spacegroup，andthecrystalstructureswerecharacterizedbytheRietveldmethodwithlaboratorypowderdiffractiondata．TheannealedglassesandglassceramicswerealsocharacterizedbyDSC，FESEMandACImpedancetechni

5、ques．TheresultsindicatethatthemajorphaseoftheglassceramicsisLiGe2(P04)3，withA1PO4andLi4P207astheside-phasesforsomesamples．Additionally，thehighesttotalionicconductivity(5．3x104S·cm)atroomtemperatureisobtainedwhen=1．5forLi~A1一1Ge3(P04)3glassceramics，withhomogeneouscrystalsdistribu

6、tionandwideelectrochemicalwindow(7．2V)．Keywords：glassceramics；solidelectrolyte；Rietveldrenement；ionicconductivity0IntroductionconductivitythanthecorrespondingmotherglasseswhenconductivecrystalsareprecipitatedfromtheIncomparisonwiththeparentglass，glasscera—glasses．Theseglassceram

7、icshavebeenattractedmicsdemonstrateadensermicrostructure，lessgrainmuchattentionowingtotheirexcellentlithiumionicboundaryeffectsandbetterchemicalstability．conductivityandlowatomicmassoflithium．LithiumMoreover，theNASICON(NaSuperIonicConductor)ionicconductorsstoodagoodchancetobeuse

8、dasstructuresglassceramicsexhibithigherionicele