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时间:2020-03-27
《焙烧温度对锂离子电池正极材料Li2MnSiO4,C电化学性能的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学~(WuliHuaxueXuebao1NovemberActa.一C.Sin.2011,27(11),2587-25922587[Article]Ⅵr、^,、V.whxb.pku.edu.Crl焙烧温度对锂离子电池正极材料Li2MnSiO4,C电化学性能的影响魏怡王利娟’闫继’沙鸥’唐致远’马莉(天津大学化工学院,天津300072;东莞迈科科技有限公司,广东东莞523800)摘要:采用液相法合成了MnSiO,C复合正极材料,并研究了不同焙烧温度对材料的结构、形貌和电化学性能的影响.利用热重(TG)分析了材料前驱体的热行为,确定了合成Li:MnSiO/C复合正极材
2、料的焙烧温度范围为600—800。C.X射线衍射(xRD)测试结果表明,不同温度下合成的样品材料均具有正交结构,且空间群为Pmn2,同时利用扫描电子显微镜(SEM)对所得样品材料的微观形貌及颗粒大小进行了表征.将所得LiMnSiO/C复合正极材料组装成扣式电池,并在不同的电流密度下进行充放电测试,结果表明:700。C合成的样品材料电化学性能最佳,具有较高的库仑效率及很好的循环稳定性.关键词:锂离子电池:正极材料:Li:MnSiO:液相法:焙烧温度中图分类号:0646;TM912.9CalcinationTemperatureEfectsontheElectrochemic
3、alPerformanceofLi2MnSiOdCCathodeMateriaIforLithiumIonBatteriesWElY\/\,ANGLi.Juan’、,ANJi’SHAOu’1-ANGZhi—YuanMALifSchoolofChemicalEngineeringandTechnology,TianjinUniversity,Tianjin300072,R.China;2McNairTechnologyCompany,Limited,Dongguan523800,GuangdongProvince,PR.China)Abstract:Asanewpotent
4、ialcathodematerialforlithiumIOnbatteries.Li2MnSiO4,Cwassynthesizedbyasolutionmethod.ThethermaIbehavioroftheprecursorforLi2MnSiO4,Cwasmeasuredbylhermogravimetric(TG)analysisandlherangeofcalcinationtemperaturesfr0m600to800。Cwasdetermined.X.raypowderdifraction(XRD)patternsindicatedthalallthe
5、Li2MnSiO4/CsamplescrystallizedinanorthorhombicstructurewithspacegroupPmn21.ThemorphologyandparticlesizeoflhesampleswerealsocharacterizedbyscanningelectronmicroscopyfSEM).TheefectsofcalcinationtemperatureontheelectrochemicalperformanceofLi2MnSiO4/Cwerestudiedusingflalvanostaticcharge.disch
6、argemeasurementsatvariouscurrentdensities.Theresultsshowedthatthesamplepreparedat700。Cexhibitedamuchhighercoulombicefficiencyandbettercyclicperformancethantheothersamples.KeyWords:Lithiumionbattery;Cathodematerial;Li2MnSiO4:Solutionmethod;Calcinationternperature1IntrOductiontronicdevicesa
7、ndelectricvehicles,searchingforanewgenera.Largescalelithiumionbatterieshavebeenwidelyusedintionofcathodematerialsforlithiumionbatterieshasbeenanur—telecommunication,portablecomputers,andentertainmentde—gentmissiontowardresearchers.SinceLiFePO4cathodemateri.vices,due
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