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  • Effects of surface stress on lithium-ion diffusion kinetics in nanosphere electrodes of lithium-ion batteries

    表面应力对锂离子电池纳米球电极中锂离子扩散动力学的影响

    2 约7页 pdf
    标签: Surface stress Diffusion kinetics Nanosphere electrode Lithium-ion battery

    出版日期:2020

    杂志名称:International Journal of Mechanical Sciences
    卷号:169
    期数:Complete
    刊号:0020-7403
    出版日期:2020

    简介:Theexperimentalevidencesuggeststhatthelithiumionstendtoaggregateonthenear-surfaceofnanoscaleelectrodeparticlesinlithium-ionbatteries.However,theunderlyingmechanismhasnotbeenwellunderstood.Inthiswork,basedontheestablishedchemo-mechanicalcoupledmodelfeaturingsurfacestress,stress-dependentchemicalpotential,andstress-mediateddiffusivity,thesize-dependenceofdiffusionkineticsinnanosphereelectrodesisinvestigated.Theresultsshowthatadditionalcompressivestressescausedbythesurfacestressretardtheattainablelithiationduetothereducedsurfacestress-dependentdiffusivity,andthehighlithiationregionhasagrowingtendencytomoveonthenear-surfaceregionwithdecreasingthedimensionsofnanospheres.Theworkindicatesthattheeffectsofsurfacestressonlithium-iondiffusionkineticsmayresultinthecapacitor-likebehaviorofbatterymaterialsconsistingofelectrodenanoparticles."

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