简介：SkeletalformofKNbO3crystalsgrowinginLi2B4O7solventwasin-situobservedat900CanditwasfoundthatshallowdepressionstartedtodeveloponthesurfaceofKNbO3crystalswhenthecrystalsizeexceededseveralmicron,typically7micron.BasedonthequantitativecriterionderivedbyChernov,theestimatedcriticalsizeofKNbO3crystalswas1micron,whichwasconsistentwiththeexperimentalmeasurement.Thekineticcoefficients,kcerandkc,,inthecriterionwereexperimentallyobtainedinthediffusive-convectiveanddiffusive-advectiveflowstatesrespectively.

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简介：Theyolk-shellFe3O4@Cnanocubesweresuccessfullysynthesizedthroughcarbothermicreductionprocessfromcarbon-coateda-Fe2O3precursor.Theresultsshowthattheyolk-shellFe3O4@Cnanocubesareuniformlycoatedwithathincarbonlayer,andaclearcavityabout150nminwidthbetweenFe3O4coreandcarbonshellareformedduetothevolumeshrinkageduringthereductiontreatment.Theobtainedyolk-shellFe3O4@Cnanocubesexhibitexcellentcyclingstability(thedischargecapacityis709.7mAh/gafter100cyclesatthecurrentdensityof0.1C)andrateperformance(1023.4mAh/gat0.1C,932.5mAh/gat0.2C,756.1mAh/gat0.5C,405.6mAh/gat1C,and332.3mAh/gat2C,andmoreimportantly,whenthecurrentdensityfinallybacksto0.1C,acapacityof776.8mAh/gcanberestored).Theoutstandinglithiumstoragepropertiesmaybeattributedtotheuniqueyolk-shellstructures.

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