富锂锰基正极材料包覆改性研究毕业论文

《富锂锰基正极材料包覆改性研究毕业论文》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、毕业论文富锂锰基正极材料Li1.2Mn0.54Ni0.13Co0.13O2包覆改性研究毕业设计（论文）中文摘要富锂锰基正极材料Li1.2Mn0.54Ni0.13Co0.13O2包覆改性研究摘要：本文以Mn0.54Ni0.13Co0.13(OH)2为前驱体、Li2CO3为锂源，通过高温固相法合成富锂锰基正极材料Li1.2Mn0.54Ni0.13Co0.13O2。用液相法对其进行AlF3包覆，采用XRD和SEM对材料的结构和形貌进行表征，采用恒流充放电测试对材料的电化学性能进行表征。分别以AlF3包覆量、包覆溶

2、液pH值和热处理温度为考察因素进行单因素实验以确定最优的包覆工艺。结果表明，当包覆量为2wt.%，包覆溶液pH=9，热处理温度为400°C时，材料的首次充放电性能和倍率放电性能最好。首次充放电效率由58.7%提高到73.6%，0.2C、0.5C和1.0C下放电比容量分别由184.9mAh/g、171.4mAh/g和153.0mAh/g提高到239.6mAh/g、229.9mAh/g和215.9mAh/g。当包覆量为2wt.%，包覆溶液pH=9，热处理温度为450°C时，材料的循环性能最好，在0.5C时50次

3、循环后放电比容量由143.6mAh/g提高到176.7mAh/g。关键词：富锂正极材料Li1.2Mn0.54Ni0.13Co0.13O2AlF3包覆电化学性能毕业设计（论文）外文摘要ResearchonthecoatingmodificationofLi1.2Mn0.54Ni0.13Co0.13O2cathodematerialAbstractLi1.2Mn0.54Ni0.13Co0.13O2cathodematerialwassynthesizedbyhigh-temperaturesolid-state

4、methodusingMn0.54Ni0.13Co0.13(OH)2asprecursorandLi2CO3aslithiumsource.AlF3coatingwascarriedoutbyliquidphasemethod.ThestructureandmorphologyofthematerialswerecharacterizedbyXRDandSEM,andtheelectrochemicalpropertiesofthematerialswerecharacterizedbyconstant-c

5、urrentcharge/dischargetests.TheAlF3coatingamount,pHvalueofcoatingsolutionandheattreatmenttemperaturewereregardedassinglefactorstodeterminetheoptimalparametersofAlF3coatingprocess.Theresultsshowthatwhencoatingamountis2wt%,pHvalueofcoatingsolutionis9,heattre

6、atmenttemperatureis400OC,theas-obtainedmaterialexhibitstheoptimalinitialcharge-dischargeperformanceandratecapability.Theinitialcharge-dischargeefficiencyincreasesfrom58.7%to73.6%.Thedischargecapacitiesat0.2C,0.5Cand1.0Careincreasedfrom153.0mAh/g,171.4mAh/g

7、and184.9mAh/gto239.6mAh/g,229.9mAh/gand215.9mAh/g,respectively.Whencoatingamountis2wt%,pHvalueofcoatingsolutionis9,heattreatmenttemperatureis450oC,theas-obtainedmaterialshowsthebestcyclingperformance,whosedischargecapacityisincreasedfrom143.6mAh/gto176.7mA

8、h/gafter50cyclesat0.5crate.Keywords:Lithium-richcathodematerialLi1.2Mn0.54Ni0.13Co0.13O2AlF3coatingElectrochemicalperformance目录1绪论11.1研究背景11.2富锂锰基正极材料的基本性质与制备方法21.3富锂锰基正极材料的缺点及改进方法41.4选题依据及主要研究内容42实验52.1实验仪器与