P1-2966The Role of Grain Boundaries in Suppressing Particle Fracture in Li-Rich Layered Oxide Cathode MaterialsSolid State Battery Ionics Group, GREEN Marcela CalpaE-mail：： CALPA.Marcela@nims.go.jpKey Words: Li-rich layered oxides, polycrystalline materials, fracture mechanismLi-richlayeredoxidecathodematerialshavegreatpotentialtoincreasetheenergydensityofLi-ionbatteries,deliveringhighercapacitiesathighvoltage.However,theirapplicationishinderedbyrapidcapacityfading,oftencausedbymechanicalfailure.Addressingthesechallengesiscrucialtomeetthegrowingdemandforenergystoragesystems.⚫ThecrystallitesizeofLi-richlayeredoxidecathodematerialscontrolstheirmechanicalstrength⚫Reducingcrystallitesizeenhancesfractureresistance⚫HighergrainboundarydensityredistributesinternalstressandsuppressesintragrainfracturepropagationConclusionMicrostructure analysisMicrostructure evolution⚫InvestigatetheparticlefracturebehaviorofLi-richlayeredoxidesinsolid-statebatterieswherefractureseffectsareexpectedtobemoreseverebecausesolidelectrolytescannotinfiltratecracksoraccommodateparticleexpansionFuture PlanIntroductionThisstudyexaminestheinfluenceofcrystalliteandparticlesizeonthemechanicalpropertiesofpolycrystallineLi-richcathodematerials.Li2RuO3(particlesize10µmand4µm)isusedasamodelbecauseitallowsextensivelithiumextractionwithoutoxygenlossorcationmixing,therebyisolatingtheeffectsofmechanicalfailureoncapacityfading.Theme underDiscussion10 µm10 µmLRO_10LRO_400110001000110001010 µmSEM Cross-section SEMEBSD mappingParticle sizeGrain sizeMisorientation between adjacent grains10 µm10 µm10 µmBoth samples exhibit similar structural changesupon lithium extractionInLRO_4,grainboundariesactsaseffectivebarrierstofracturepropagationTEM analysis of LRO_4 after lithium extraction LRO_10LRO_4Electrochemical performanceSingle crystal caseAbsence of grain boundaries facilitates fracture propagationIn-situ XRD: Changes in crystal structure during lithium extraction4.85 ÅLi4.89 Å4.80 Å4.70 ÅLiRu-0.5Li-0.3 Li-0.2 LiLRO_10LRO_4LRO_41 µm10 nm5 nmDomain 1Domain 2
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