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时间:2020-03-27
《熔融浸渍法合成单晶锰酸锂作为锂离子电池阴极材料.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、第30卷第8期无机化学学报Vol
2、30No.82014年8月CHINESEJ0URNAL0FIN0RGANICCHEMISTRY1977.1984熔融浸渍法合成单晶锰酸锂作为锂离子电池阴极材料余琦1田建华,1冯明燕1单忠强1崔兰2(天津大学化工学院,天津300072)(天津大学分析测试中心,天津300072)摘要:以二氧化锰和氢氧化锂为原料,通过熔融浸渍法合成具有尖晶石构型的单晶锰酸锂。前驱体一MnO:以乙酸锰和过硫酸钠为原料通过水热反应合成。基于TGMDTA测试,确定了单晶锰酸锂的煅烧温度为470℃预烧5h,再升温至750℃保温12h。XRD,丌IR和SEM结果表
3、明,合成的单晶锰酸锂具有均~的棒状结构以及良好的结晶性。电化学性能测试结果表明材料在0.1C倍率下充放电时。其首次放电比容量可达126mAh·g一.且在一百次循环之后容量保持率为91%。关键词:锂离子电池;锰酸锂;单晶;熔融浸渍法中图分类号:0614.111:0614.711文献标识码:A文章编号:1001.4861(2014)08—1977.08DOl:10.11862/CJIC.2014.258Melt·ImpregnationSynthesisofSingleCrystallineSpinelLiMn204NanorodsasCathodeMaterialsf
4、orLi.IonBatteriesYUQiTIANJian—Hua,一FENGMing—YanSHANZhong—QiangCUILan。(SchoolofChemicalEngineeringandTechnology,TianjinUniversity,Tianjin300072,China)nalysisandTestingCenter,TianjinUniversity,Tianjin300072。China)Abstract:ThesinglecrystallinespinelLiMn204wassynthesizedbymelt—impregnation
5、methodwiththeprecursor卢一Mn02andLiOH.The卢-MnO2waspreparedfromMn(CH3CO0)2·4H20andNa2S208byhydrothermalreaction.BasedonTGMDTAanalysis.theoptimalcalcinationtemperatureisfixedat470℃for5hfollowedby750℃f0r12h.TheinuenceofthesinteringprocessonpropertiesofsinglecrystallineLiMn204wasalsoinvestig
6、ated.XRD,FTIRandSEMresultsdemonstratetheuniformparticlesandgoodcrystallinityofsinglecrystallinespinelLiMn204nanorods.ThesinglecrystallineLiMn2O4obtainedbyMelt-impregnationmethodexhibitsasuperiorelectrochemicalperformance,whichdeliversaninitialspecificcapacityof126mAh。g一and91%capacityre
7、tentionatthelOOthcycleinthepotentialrangeof3.0to4.4V(VSLi/Li3.Keywords:Li—ionbattery;LiMn204;singlecrystalline;melt—impregnationmethod0Introductionweight,andlongcyclelife,havebeenregardedasoneofthenear—termsolutions[1_31.However.thereportedLiLookingforgreenrenewableresourcestoreplace—i
8、ontechnologiesfallshortofmeetingtheelectricnon—renewableresourcesisessentialin21stcenturyvehiclesrequirementofhighercharge—dischargeratebecauseoftheworldwideenergyshortage.Li-ioncapability.Therefore,itishighlydesirabletodevelopbatteries,owingtotheirhighenergydensity,lightthematerials
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