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1、物理化学学报(WuliHuaxueXuebao)MayActaPhys.-Chim.Sin.2015,31(5),905-912905[Article]doi:10.3866/PKU.WHXB201503091www.whxb.pku.edu.cn高倍率性能锂离子电池Li[Ni1/3Co1/3Mn1/3]O2正极材料的制备及其电化学性能*张继斌滑纬博郑卓刘文元郭孝东钟本和(四川大学化学工程学院,教育部磷资源综合利用与清洁加工工程研究中心,成都610065)摘要:采用改进的碳酸盐共沉淀与高温固相法
2、相结合的方法制备出了高倍率性能的锂离子电池正极材料Li[Ni1/3Co1/3Mn1/3]O2,通过X射线衍射(XRD)、扫描电镜(SEM)、循环伏安扫描(CV)、电化学阻抗谱(EIS)和电化学性能测试等手段对材料进行表征.结果表明,该方法制备的材料具有良好的α-NaFeO2型层状结构(R3m(166)),一次粒径平均大小为157nm,二次颗粒成球形.同传统碳酸盐制备得到的材料相比,该材料具备良好的倍率性能和循环性能,在2.7-4.3V电压范围内,0.1C(1.0C=180mA∙g-1)倍率下,首
3、次放电比容量为156.4mAh∙g-1,库仑效率为81.9%.在较高倍率下,即0.5C、5.0C和20C时,其放电比容量分别为136.9、111.3、81.3mAh∙g-1.在1C倍率下100次循环容量保持率为92.9%,高于传统共沉淀法得到的材料(87.0%).关键词:锂离子电池;正极材料;Li[Ni1/3Co1/3Mn1/3]O2;倍率性能;改进共沉淀法中图分类号:O646PreparationandElectrochemicalPerformanceofLi[Ni1/3Co1/3Mn1/3
4、]O2CathodeMaterialforHigh-RateLithium-IonBatteriesZHANGJi-BinHUAWei-BoZHENGZhuoLIUWen-Yuan*GUOXiao-DongZHONGBen-He(PhosphorusResourcesComprehensiveUtilization&CleanProcessingCenterofMinistryofEducation,SchoolofChemicalEngineering,SichuanUniversity,Ch
5、engdu610065,P.R.China)Abstract:AsphericalLi[Ni1/3Co1/3Mn1/3]O2cathodematerialforlithium-ionbatterieswassynthesizedusingacombinationofmodifiedcarbonateco-precipitationandsolid-statemethods.Theas-preparedmaterialwasanalyzedusingX-raydiffractometry(XRD)
6、,scanningelectronmicroscopy(SEM),galvanostaticcharge-dischargetests,cyclicvoltammetry(CV),andelectrochemicalimpedancespectroscopy(EIS).Theresultsindicatethatthematerialsynthesizedusingthisnewmethodhasawell-orderedlayeredstructure,α-NaFeO2[spacegroup:
7、R3m(166)],asphericalmorphology,andanaverageparticlesizeof157nm.Electrochemicalmeasurementsshowedthatthematerialhasagoodratecapabilityandlong-termcyclingperformance.Atacurrentdensityof0.1C(1.0C=180mA∙g-1)inthevoltagerange2.7-4.3V,theinitialdischargeca
8、pacitywas156.4mAh∙g-1andthecoulombicefficiencywas81.9%.At0.5C,5C,and20C,thespecificcapacitiesofthematerialwere136.9,111.3,and81.3mAh∙g-1,respectively.After100cyclesat1C,thematerialretained92.9%ofitsinitialcapacity;thisishigherthanthoseofmaterialsprep
