資源描述:
《熔融浸漬法合成單晶錳酸鋰作為鋰離子電池陰極材料.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、第30卷第8期無(wú)機(jī)化學(xué)學(xué)報(bào)Vol
2、30No.82014年8月CHINESEJ0URNAL0FIN0RGANICCHEMISTRY1977.1984熔融浸漬法合成單晶錳酸鋰作為鋰離子電池陰極材料余琦1田建華,1馮明燕1單忠強(qiáng)1崔蘭2(天津大學(xué)化工學(xué)院,天津300072)(天津大學(xué)分析測(cè)試中心,天津300072)摘要:以二氧化錳和氫氧化鋰為原料,通過(guò)熔融浸漬法合成具有尖晶石構(gòu)型的單晶錳酸鋰。前驅(qū)體一MnO:以乙酸錳和過(guò)硫酸鈉為原料通過(guò)水熱反應(yīng)合成。基于TGMDTA測(cè)試,確定了單晶錳酸鋰的煅燒溫度為470℃預(yù)燒5h,再升溫至750℃保溫12h。XRD,丌IR和SEM結(jié)果表
3、明,合成的單晶錳酸鋰具有均~的棒狀結(jié)構(gòu)以及良好的結(jié)晶性。電化學(xué)性能測(cè)試結(jié)果表明材料在0.1C倍率下充放電時(shí)。其首次放電比容量可達(dá)126mAh·g一.且在一百次循環(huán)之后容量保持率為91%。關(guān)鍵詞:鋰離子電池;錳酸鋰;單晶;熔融浸漬法中圖分類(lèi)號(hào):0614.111:0614.711文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):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盧一Mn02andLiOH.The盧-MnO2waspreparedfromMn(CH3CO0)2·4H20andNa2S208byhydrothermalreaction.BasedonTGMDTAanalysis.theoptimalcalcinationtemperatureisfixedat470℃for5hfollowedby750℃f0r12h.TheinuenceofthesinteringprocessonpropertiesofsinglecrystallineLiMn204wasalsoinvestig
6、ated.XRD,F(xiàn)TIRandSEMresultsdemonstratetheuniformparticlesandgoodcrystallinityofsinglecrystallinespinelLiMn204nanorods.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