P1-1047ProbingNanomechanicalPhenomenaonSiliconThin-filmElectrodesUsingOperandoBimodalAtomicForceMicroscopyRidwanP.Putra,KyosukeMatsushita,TsuyoshiOhnishi,andTakuyaMasudaKey Words: thin-film electrode, nanomechanical mapping, bimodal AFM•Silicon is a promising anode material for all-solid-state lithium-ion batteries due to its very high theoretical capacity (3580 mAh g-1) and low lithiation/delithiation potential. •However, Si undergoes dramatic volume expansion/shrinkage during lithiation/delithiation, resulting in cracking, pulverization, and fractures of the particles and/or electrodes. ⚫Real-timenanomechanicalmappingofa-Sithin-filmelectrodeduringelectrochemicallithiation/delithiationwasperformedbyoperandobimodalAFM.⚫QuantitativeYoung’smodulimeasuredfromtheexperimentswereconsistentwithfirst-principlescalculationresults.ConclusionsExperimental SectionResults and Discussion⚫Clarificationofnanomechanicalphenomenainvariousbatterymaterialsarecurrentlyongoing.⚫WeplantodevelopoperandobimodalAFMset-upforliquid-typelithium-ionbatterysystemsandoperandosample-holderwithautomaticconfiningpressureadjustmentduringcharge/dischargemeasurements.Future PlanIntroduction•UnderstandingandcontrolofvariousnanomechanicalphenomenainSielectrodesarecriticalforpreventingthedegradationandfailuresoftheelectrodes.•Therefore,operandobimodalatomicforcemicroscopy(AFM)systemwasdevelopedtocarryoutquantitativenanomechanicalmappingofanamorphousSi(a-Si)thin-filmelectrodeduringthefirstelectrochemicallithiation/delithiation.Theme underDiscussionBattery Materials Analysis Group, GREEN PUTRA Ridwan PratamaE-mail：： PUTRA.Ridwanpratama@nims.go.jpSiLLZTas internal standardfor R calibrationProbingAreaCypher ES Bimodal AFM(Oxford Instruments)OperandoBimodalAFMSystemCalculationofElasticModulusNanomechanicalMapsandTopographyImages1stLithiationQuantitativeYoung’sModuliofLixSiSi modulus decreasesSi modulus increasesSi/LLZT/LiCellModulus of Si electrode decreases throughout the 1stLithiationUnder Ar-filledGloveboxH2O < 0.1 ppmO2< 0.1 ppmSi + x Li++ x e-→LixSiPutra et al. J. Phys. Chem. Lett, 2024, 15(2).Voltage window: 0.01 −1.20 V vs. Li+/Li
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