碳纳米材料 新 参赛课件.ppt

《碳纳米材料 新 参赛课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

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

2、batteries,dueto1theirhightheoreticalcapacity2safety3lowcost4naturalabundanceSomeobstacle1poorcyclingperformance(largevolumeexpansionduetothegenerationofLi2O)2poorelectronicconductivity(electrodematerialswithdesignednanostructurecanimproveit)MnOshowsrelativelylowelectr

3、omotiveforce电动势(emf)value(1.032 Vvs.Li+/Li)andhighdensity(5.43 g cm−3).However,thiskindofmaterialhasseldombeenreportedasananodematerialnanocrystallineMnOthinfilm,andMnOpowderasanodehasshownlowoverpotential超电势andgoodcyclingperformanceInthispaperThepreparedMnO/Ccore–she

4、llnanorodsmuchhigherspecificcapacitythanthatofMnOmicroparticlesandMnO2nanowiresasanodematerialoflithiumionbattery.返回Experiment合成部分MnO/Ccore–shellnanorodsweresynthesizedbythereductionofcarbonprecursorcoatedMnO2nanowires.TheMnO2nanowiresweresynthesizedbyatypicalhydrothe

5、rmalreactionExperiment表征X-raydiffractionFieldemissionscanningelectronmicroscopy(FESEM）transmissionelectronmicroscopy(TEM)SAEDExperiment电化学实验部分performingusing2032coin-typecellsassembledinanargon-filledgloveboxslurry:activematerials(70 wt%),acetyleneblack乙炔黑(20 wt%),and

6、polyvinylidenefluoride聚偏二氟乙烯(PVDF10 wt%)inN-methyl-2-pyrrolidone氮甲基二吡咯烷酮(NMP).TheslurrywasspreadontotheCufoilwithadoctorblade刮墨刀片anddriedat120 °CovernightundervacuumExperimentelectrodeareais1 cm2loadingofactivematerialis1.0–1.2 mg cm−2electrolyte:asolutionof1 MLiPF6in

7、ethylenecarbonate碳酸亚乙酯(EC)anddimethylcarbonate碳酸二甲酯(DMC)withaweightratioof1:1ExperimentPurelithiumfoilwasusedascounterandreferenceelectrodeCyclicvoltammetry循环伏安法(CV)Charge–dischargetestingwasperformedintherangeof0.01–3.0 Vspecificcapacity返回Resultsanddiscussion1、MnO2na

8、nowiresweresynthesizedbyhydrothermalreaction.Thecrystalstructureoftheas-preparedMnO2nanowireswasconfirmedbyXRD(Fig.1)Allthed