碳纳米材料 新 参赛课件 (2).ppt

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1、最新参赛课件主讲：*****MnO/Ccore–shellnanorodsashighcapacityanodematerialsforlithium-ionbatteriesJournalofPowerSourcesFourparts1.Introduction2.Experiment3.Resultsanddiscussion4.ConclusionsIntroductiontransitionmetaloxideshaveattractedgreatattentionasanodematerialsforlithiumionbatteries,dueto1

2、theirhightheoreticalcapacity2safety3lowcost4naturalabundanceSomeobstacle1poorcyclingperformance(largevolumeexpansionduetothegenerationofLi2O)2poorelectronicconductivity(electrodematerialswithdesignednanostructurecanimproveit)MnOshowsrelativelylowelectromotiveforce电动势(emf)value(1.032 

3、Vvs.Li+/Li)andhighdensity(5.43 g cm−3).However,thiskindofmaterialhasseldombeenreportedasananodematerialnanocrystallineMnOthinfilm,andMnOpowderasanodehasshownlowoverpotential超电势andgoodcyclingperformanceInthispaperThepreparedMnO/Ccore–shellnanorodsmuchhigherspecificcapacitythanthatofMn

4、OmicroparticlesandMnO2nanowiresasanodematerialoflithiumionbattery.返回Experiment合成部分MnO/Ccore–shellnanorodsweresynthesizedbythereductionofcarbonprecursorcoatedMnO2nanowires.TheMnO2nanowiresweresynthesizedbyatypicalhydrothermalreactionExperiment表征X-raydiffractionFieldemissionscanningele

5、ctronmicroscopy(FESEM）transmissionelectronmicroscopy(TEM)SAEDExperiment电化学实验部分performingusing2032coin-typecellsassembledinanargon-filledgloveboxslurry:activematerials(70 wt%),acetyleneblack乙炔黑(20 wt%),andpolyvinylidenefluoride聚偏二氟乙烯(PVDF10 wt%)inN-methyl-2-pyrrolidone氮甲基二吡咯烷酮(NMP).Th

6、eslurrywasspreadontotheCufoilwithadoctorblade刮墨刀片anddriedat120 °CovernightundervacuumExperimentelectrodeareais1 cm2loadingofactivematerialis1.0–1.2 mg cm−2electrolyte:asolutionof1 MLiPF6inethylenecarbonate碳酸亚乙酯(EC)anddimethylcarbonate碳酸二甲酯(DMC)withaweightratioof1:1ExperimentPurelithi

7、umfoilwasusedascounterandreferenceelectrodeCyclicvoltammetry循环伏安法(CV)Charge–dischargetestingwasperformedintherangeof0.01–3.0 Vspecificcapacity返回Resultsanddiscussion1、MnO2nanowiresweresynthesizedbyhydrothermalreaction.Thecrystalstructureoftheas-preparedMnO2nanowireswasconfirmedbyXRD(F

8、ig.1)Allthed