碳復(fù)合錫基納米材料的制備及其在鋰離子電池負極材料中的應(yīng)用.pdf

1、學(xué)位論文獨創(chuàng)性聲明本人鄭重聲明：所提交的學(xué)位論文是本人在導(dǎo)師指導(dǎo)下進行的研究工作和取得的研究成果。本論文中除引文外，所有實驗、數(shù)據(jù)和有關(guān)材料均是真實的。本論文中除引文和致謝的內(nèi)容外，不包含其他人或其它機構(gòu)已經(jīng)發(fā)表或撰寫過的研究成果。其他同志對本研究所做的貢獻均已在論文中作了聲明并表示了謝意。學(xué)位論文作者簽名：癱翌琿日期：pf鈕r7V學(xué)位論文使用授權(quán)聲明研究生在校攻讀學(xué)位期間論文工作的知識產(chǎn)權(quán)單位屬南京師范大學(xué)。學(xué)校有權(quán)保存本學(xué)位論文的電

2、子和紙質(zhì)文檔，可以借閱或上網(wǎng)公布本學(xué)位論文的部分或全部內(nèi)容，可以采用影印、復(fù)印等手段保存、匯編本學(xué)位論文。學(xué)校可以向國家有關(guān)機關(guān)或機構(gòu)送交論文的電子和紙質(zhì)文檔，允許論文被查閱和借閱。(保密論文在解密后遵守此規(guī)定)保密論文注釋：本學(xué)位論文屬于保密論文，密級：——保密期限為——年。學(xué)位論文作者簽名：癯建軍指導(dǎo)教師簽名日期：≯，甲，r7V日期AbstractAbstractInrecentyears，theanodematerialsofco

3、mmerciallithium—ionbatteries(LIBs)aregraphite—basedcarbonmaterialsHowever，carbonbasedmaterial、ⅣithlowspecificcapacitiesCannotmeettheperformancerequirementsofelectricvehiclesandenergystoragedevicesTherefore，itishighlydesi

4、rabletosearchforaltemativeanodematerials誦t1111ighspecificcapacitiestoreplacethecarbonanodesOwingtotheirhighspecificcapacitiestinbasedmaterialshavebeenconsideredtobeidealanodiccandidatesforadvancedLIBswithhigllenergydensi

5、tyandpowerdensityHowever，thepracticalapplicationoftinbasedanodeshasbeenhamperedprimarilybytheirhugevolumeexpansioncontractionduringcycling，whichleadstothepulverization，lossofelectricalcontact，andfastcapacityfadingThecomp

6、ositesofcarbonandtin—basednanomaterialspossessthesuperioritiesofbothnanomaterialsandcarbonmaterials，andareexpectedtomeettheperformancerequirementsofadvancedLIBsInthisthesis，wefocusonthetin—basedanodes，includingSnS2，Sn02，

7、andtinbasedalloysSpecificallywehavepreparedaseriesofnanocompositesofcarbonandtinbasedmaterialsthroughfacilechemicalreaction，usingthree—dimensional(3D)mesoporouscarbonasamatrix，SnnanospheresandSnCl漲2Ni(CN)4cyanogelasprecu

8、rsors，respectivelyOwingtotheiruniquestructuralandcompositionalfeatures，theaspreparednanocompositesofcarbonandtinbasedmaterialsmanifestenhancedlithium—storageperformanceThemaininnovativeresultsaredisplayedasfollows：(1)Byu

9、sing3DmesoporouscarbonaSanovelmatrix，wehavepreparedmesoporouscarbonsupporedSnS2nanosheetsthroughafacilesonochemicalrouteCompared試也bareSnS2samplethemesoporouscarbonsupportedSnS2nanosheetsintegratesthestructuralcharacteris

10、ticsofbothtwodimensional(2D)nanosheetand3Dporouscarbonmatrix，andisthusexhibitimprovedcapacityretentionhighcapacities，andratecapabilityForexample，themesoporouscarbon—supportedSnS2nanosheetsisabletodelivera11ighreversiblec

11、apacityof4288mAh91atacurrentdensityof100mAg～after50cycles(2)ByusingSnnanospheresasprecursors，wehavepreparedSn02@CyolkshellspheresaRersilicacoating，oxidation，PVDFpyrolysis，andetchingprocessesCompared誦thbareSn02spheres，Sn0