Investigation of the Stability of the Poly(ethylene oxide)|LiNi1-x-y CoxMnyO2 Interface in Solid-State Batteries

dc.contributor.authorYusim, Yuriy
dc.contributor.authorHunstock, Dirk F.
dc.contributor.authorMayer, Alexander
dc.contributor.authorBresser, Dominic
dc.contributor.authorPasserini, Stefano
dc.contributor.authorJanek, Jürgen
dc.contributor.authorHenss, Anja
dc.date.accessioned2024-02-28T12:19:50Z
dc.date.available2024-02-28T12:19:50Z
dc.date.issued2023
dc.description.abstractWhile solid-state batteries (SSBs) comprising poly(ethylene oxide) (PEO) based electrolytes are successfully commercialized already for operation at elevated temperature, the selection of the cathode active material (CAM) has so far been limited to LiFePO4. When using high-voltage CAMs such as LiNi1-x-yCoxMnyO2 (NCM), the cells experience fast capacity fading – the cause of which is not consistently understood in literature. In this study, electrochemical impedance spectroscopy measurements in a three-electrode setup are applied to confirm that the NCM|PEO interface is indeed the Achilles' heel in PEO-based SSBs at high voltages. In this regard, the interfacial stability on the cathode side depends not only on the upper cut-off voltage, but also on the molecular weight of PEO, strongly affecting the cell performance. Scanning electron microscopy images of the cathodes after cycling suggest that at high voltages interfacial degradation leads to fragmentation of the polymer backbone and to a decrease in viscosity of the solid polymer electrolyte. Overall, the results help to understand the detrimental processes occurring in PEO-based SSBs in combination with high-voltage cathodes.
dc.description.sponsorshipDeutsche Forschungsgemeinschaft (DFG); ROR-ID:018mejw64
dc.identifier.urihttps://jlupub.ub.uni-giessen.de//handle/jlupub/19047
dc.identifier.urihttp://dx.doi.org/10.22029/jlupub-18408
dc.language.isoen
dc.rightsNamensnennung 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.ddcddc:540
dc.titleInvestigation of the Stability of the Poly(ethylene oxide)|LiNi1-x-y CoxMnyO2 Interface in Solid-State Batteries
dc.typearticle
local.affiliationFB 08 - Biologie und Chemie
local.projectHybrid-SIMS grant number INST 162/544-1 FUGG
local.source.articlenumbere2300532
local.source.epage10
local.source.journaltitleAdvanced materials interfaces
local.source.number3
local.source.spage1
local.source.urihttps://doi.org/10.1002/admi.202300532
local.source.volume11

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