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資料庫>A transmission electron microscopy study of crack formation and propagation in electrochemically cyc
A transmission electron microscopy study of crack formation and propagation in electrochemically cyc
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2018-08-21 10:00 1076閱讀次數(shù)
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Subsurfacedefectsandlocalcompositionalchangesthatoccurredingraphiteanodessubjectedtocyclicvoltammetrytests(vs.Li/Li+,usinganelectrolyteconsistingof1MLiClO4ina1:1volumetricmixtureofethylenecarbonateand1,2-dimethoxyethane)wereinvestigatedusinghigh-resolutiontransmissionelectronmicroscopy(HR-TEM).Cross-sectionsofanodespreparedbyfocusedionbeam(FIB)mil領(lǐng)indicatedthatgraphitelayersadjacenttosolidelectrolyte(SEI)/graphiteinterfaceexhibitedpartialdelaminationduetotheformationofinterlayercracks.TheSEIlayerformedonthegraphitesurfaceconsistedofLi2CO3thatwasidentifiedby{110}and{002}crystallographicplanes.Lithiumcompounds,LiC6,Li2CO3andLi2O,wereobservedonthesurfacesofseparatedgraphitelayers.Depositionofthesecointercalationcompoundsnearthecracktipcausedpartialclosureofpropagatinggraphitecracksduringelectrochemicalcyc領(lǐng),andpossiblyreducedthecrackgrowthrate.Graphitefibresthatwereobservedtobridgecrackfaceslikelyprovidedanadditionalmechanismfortheretardationofcrackpropagation.
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A transmission electron microscopy study of crack formation and propagation in electrochemically cyc- Subsurfacedefectsandlocalcompositionalchangesthatoccurredingraphiteanodessubjectedtocyclicvoltammetrytests(vs.Li/Li+,usinganelectrolyteconsistingof1MLiClO4ina1:1volumetricmixtureofethylenecarbonateand1,2-dimethoxyethane)wereinvestigatedusinghigh-resolutiontransmissionelectronmicroscopy(HR-TEM).Cross-sectionsofanodespreparedbyfocusedionbeam(FIB)mil領(lǐng)indicatedthatgraphitelayersadjacenttosolidelectrolyte(SEI)/graphiteinterfaceexhibitedpartialdelaminationduetotheformationofinterlayercracks.TheSEIlayerformedonthegraphitesurfaceconsistedofLi2CO3thatwasidentifiedby{110}and{002}crystallographicplanes.Lithiumcompounds,LiC6,Li2CO3andLi2O,wereobservedonthesurfacesofseparatedgraphitelayers.Depositionofthesecointercalationcompoundsnearthecracktipcausedpartialclosureofpropagatinggraphitecracksduringelectrochemicalcyc領(lǐng),andpossiblyreducedthecrackgrowthrate.Graphitefibresthatwereobservedtobridgecrackfaceslikelyprovidedanadditionalmechanismfortheretardationofcrackpropagation.[詳細(xì)]
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2018-08-21 10:00
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2018-08-31 10:11
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