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1、·40·硅酸盐学报2007年硅酸盐学报第35卷第8期Vol.35，No.82007年8月JOURNALOFTHECHINESECERAMICSOCIETYAugust，2007水热合成工艺对Zn2SnO4纳米晶形貌及电化学性能的影响1,22112徐甲强，张海林，潘庆谊，向群，李超(1.上海大学理学院化学系，上海200444；2.郑州轻工业学院，郑州450002)摘要：采用水热法合成了新型锂离子电池阳极材料Zn2SnO4纳米晶。研究了水热时间对材料结构、形貌及电化学性能的影响。通过X射线衍射、透射电镜和电化学法表征了产物
2、的结构和形貌，并测试了材料的电化学特性。结果表明：水热时间将影响产物的形貌、尺寸和结晶度，从而影响其电化学性能。220℃水热处理28h后，所获得的Zn2SnO4具有较小的颗粒尺寸和较高的结晶度，其初始放电比容量达591.9(mA·h)/g；同样温度处理24h后获得的Zn2SnO4其初始放电容量为502.7(mA·h)/g，充放电14次后仍有409.5(mA·h)/g。220℃水热处理获得的Zn2SnO4具有锂离子电池阳极材料应用所需的优异的电化学特性。关键词：水热过程；锡酸锌；阳极材料；电化学性能中图分类号：TB383
3、文献标识码：A文章编号：0454–5648(2007)08–INFLUENCEOFHYDROTHERMALSYNTHESISPROCESSONMORPHOLOGYANDELECTROCHEMICALPROPERTIESOFZn2SnO4NANOCRYSTALSSYNTHESIZEDBYHYDROTHERMALMETHOD1,22112XUJiaqiang，ZHANGHailin，PANQingyi，XIANGQun，LIChao(1.DepartmentofChemistry,CollegeofScience,Shan
4、ghaiUniversity,Shanghai200444;2.CollegeofMaterialsandChemicalEngineering,ZhengzhouUniversityofLightIndustry,Zhengzhou,450002,China)Abstract:SphericalZn2SnO4nanocrystals,anewpossibleLi-ionbatterynegativeelectrodematerial,weresynthesizedbyahydro-thermalmethod.Thei
5、nfluenceofhydrothermaltimeontheproductstructureandtheelectrodeperformanceofthesampleswerestudied.Themicrostructure,morphologyandelectrochemicalperformanceofthematerialswereinvestigatedbytheX-raydiffractiontransmissionelectronmicroscopyandelectrochemicalmethods.T
6、heresultsindicatethatthehydrothermaltimehadaneffectonthesizeandcrystallinityoftheas-preparedmaterials,whichconsequentlyaffectedtheirelectrochemicalperformance.TheZn2SnO4sam-plepreparedbyhydrothermaltreatmentat220℃for28hexhibitedsmallerparticlesizesandhighercryst
7、allinity,showingabiggerinitialdischargecapacityof591.9(mA·h)/gattheconstantcurrentdensityof100mA/gwithinthevoltagerangeof0—1.4V.TheZn2SnO4samplepreparedat24hhadbiggerparticlesizesandlowercrystallinity,displayingbettercyclestability,whichretainedacapacityof409.5(
8、mA·h)/gafter14cycles.TheZn2SnO4samplepreparedfor24hexhibitedalargedischargecapacityandgoodcycleperformance,whicharenecessaryforuseasLi-ionbatteryanodes.Keywords:hydro
