納米碳基過渡金屬氧化物用于高倍率鋰電負(fù)極的研究.pdf

1、分類號。UDC密級公開另毋廬夕擎碩士研究生學(xué)位論文納米碳基過渡金屬氧化物用于高倍率鋰電負(fù)極的研究申請人：學(xué)號：培養(yǎng)單位：學(xué)科專業(yè)：研究方向：指導(dǎo)教師：完成日期：趙冬冬2131082化學(xué)與化工材料學(xué)院無機(jī)化學(xué)基于能量轉(zhuǎn)換過程的固體材料學(xué)付宏剛教授2016年3月23日AbstractGraphenenanosheetsareregardedaspotentialelectrodesinLiionbatteries(LIBs)，therefo

2、re，itisofgreatessentiallytosynthesisthesematerialswithbothlowcostandproductivityTransitionmetaloxideshavehighertheoreticalspecificcapacitycomparedwithpurecarbonmaterialWhileusingasthenegativeelectrodematerial，thereareman

3、ydrawbacks，suchas：poorelectricalconductivity，undesirablestability，thehugevolumechangeduringthelithiation／delithiationprocessRecently，theflexibleelectrodes(suchascarboncloth，carbonpaperandfoamnickel)graduallyreplacethetra

4、ditionalelectrodes(coatedoncopperfoil)3DflexiblesubstratecanbeCOprecipitatedintothreedimensionalstructurewithspecialmorphologybythehydrothermalorsolventthermalprocessandtheheattreatmentprocessPorousgraphenelikenanosheets

5、(PGS)havebeensynthesizedfromexpandablegraphite(EG)byfirstlyintercalatingphosphoricacid，followedbyanannealedprocesstoenlargetheinterlayerdistanceofEG，whichisfavorableforsubsequentintercalationofzincchlorideThen，thefollowe

6、dpyrolysisofzincchlorideintheinterlayerofEGcouldformtheporousstructurewiththegasproducedThismaterialcanbeusedforelectronics，sensorsandenergystorageandconversionThispapercombinesgraphenewithcobaltoxideandsulfideGraphenena

7、nosheetshavelayerstructure，infavoroftheelectronsandionsintothesurfaceandpromotethereactionquicklyMoreimportantly，thenanosheetofgraphitelayersandthetransitionmetaloxidehavemoreactivesitesandthecontactarea，increasingthecon

8、ductivityofthematerial，whichreducesthevolumeexpansionduringchargeanddischargeprocess，Hence，improvingthecharge／dischargecapacity，ratecharacteristicsandcyclestabilityThispaperhassynthesismurdochite—typeNi6MnOsandspinelMnC0