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    • Hierarchical functional layers on high-capacity lithium-excess cathodes for superior lithium ion batteries

    用于优质锂离子电池的高容量锂过量阴极上的分级功能层

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    出版日期： 2014
    标签： Li-excess layered cathode material Atomic layer deposition Core&ndash shell structure Hierarchical functional layers

    出版日期:2014

    作者单位:DepartmentofMechanicalandIndustrialEngineering,LouisianaStateUniversity,BatonRouge,LA70803,UnitedStates
    杂志名称:Journal of Power Sources
    卷号:247
    期数:Complete
    刊号:0378-7753
    出版日期:2014

    简介:Li-excesslayeredLi[Li0.2Mn0.54Ni0.13Co0.13]O2(LMNCO)nanoparticlesarefacilelysynthesizedusingasurfactant-assisteddispersionmethod.UltrathinandconformaloxidecoatingsaredepositedonthesurfaceofindividualLMNCOnanoparticleviaatomiclayerdeposition(ALD).TheeffectofoxideALDcoatingsonimprovingelectrochemicalperformanceofLMNCOelectrodesisevaluatedandoptimizedviatuningthecoatingthicknessandcomposition.Inaddition,wesynthesizeanovelcore-shellstructurecathodeconsistingofLi-excessLMNCOascoreandLi-stoichiometricmaterialasshell,anditselectrochemicalpropertyisoptimizedbytailoringweightcontentandcompositionofshellmaterials.Finally,electrochemicalperformanceofLi-excesscathodematerialcanbemaximizedbysurfacemodificationwithhierarchfunctionallayerscomposedof10?wt.%LiCoO2shell(?0?nmthick)and6ZrO2ALDlayers(??nmthick),whichdeliversveryhighinitialdischargecapacitiesof296.4,259.8,156.6and104.2?mAh?g?at0.1C,1C,5Cand10C,andcanretain184.0?mAh?g?at1Cafter100electrochemicalcycles.SuchremarkablyimprovedcycleabilitiyandratecapabilityofnanoarchitectedLi-excesslayeredcathodematerialcanbeattributedtothesynergiceffectfromhierarchicalfunctionalcoatingstoreduceelectrochemicalpolarization,structuraldegradationandsidereactionsduringelectrochemicalcycling.

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