富鋰錳基正極材料包覆改性研究畢業(yè)論文

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1、畢業(yè)論文富鋰錳基正極材料Li1.2Mn0.54Ni0.13Co0.13O2包覆改性研究畢業(yè)設(shè)計(jì)（論文）中文摘要富鋰錳基正極材料Li1.2Mn0.54Ni0.13Co0.13O2包覆改性研究摘要：本文以Mn0.54Ni0.13Co0.13(OH)2為前驅(qū)體、Li2CO3為鋰源，通過(guò)高溫固相法合成富鋰錳基正極材料Li1.2Mn0.54Ni0.13Co0.13O2。用液相法對(duì)其進(jìn)行AlF3包覆，采用XRD和SEM對(duì)材料的結(jié)構(gòu)和形貌進(jìn)行表征，采用恒流充放電測(cè)試對(duì)材料的電化學(xué)性能進(jìn)行表征。分別以AlF3包覆量、包覆溶

2、液pH值和熱處理溫度為考察因素進(jìn)行單因素實(shí)驗(yàn)以確定最優(yōu)的包覆工藝。結(jié)果表明，當(dāng)包覆量為2wt.%，包覆溶液pH=9，熱處理溫度為400°C時(shí)，材料的首次充放電性能和倍率放電性能最好。首次充放電效率由58.7%提高到73.6%，0.2C、0.5C和1.0C下放電比容量分別由184.9mAh/g、171.4mAh/g和153.0mAh/g提高到239.6mAh/g、229.9mAh/g和215.9mAh/g。當(dāng)包覆量為2wt.%，包覆溶液pH=9，熱處理溫度為450°C時(shí)，材料的循環(huán)性能最好，在0.5C時(shí)50次

3、循環(huán)后放電比容量由143.6mAh/g提高到176.7mAh/g。關(guān)鍵詞：富鋰正極材料Li1.2Mn0.54Ni0.13Co0.13O2AlF3包覆電化學(xué)性能畢業(yè)設(shè)計(jì)（論文）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目錄1緒論11.1研究背景11.2富鋰錳基正極材料的基本性質(zhì)與制備方法21.3富鋰錳基正極材料的缺點(diǎn)及改進(jìn)方法41.4選題依據(jù)及主要研究?jī)?nèi)容42實(shí)驗(yàn)52.1實(shí)驗(yàn)儀器與