Print Email Facebook Twitter Electrochemical-mechanical modeling of solid polymer electrolytes Title Electrochemical-mechanical modeling of solid polymer electrolytes: Impact of mechanical stresses on Li-ion battery performance Author Grazioli, D. (TU Delft Applied Mechanics) Verners, O. (TU Delft Applied Mechanics) Zadin, Vahur (University of Tartu) Brandell, Daniel (Uppsala University) Simone, A. (TU Delft Applied Mechanics; Università degli Studi di Padova) Date 2019 Abstract We analyze the effects of mechanical stresses arising in a solid polymer electrolyte (SPE) on the electrochemical performance of the electrolyte component of a lithium ion battery. The SPE is modeled with a coupled ionic conduction-deformation model that allows to investigate the effect of mechanical stresses induced by the redistribution of ions. The analytical solution is determined for a uniform planar cell operating under galvanostatic conditions with and without externally induced deformations. The roles of the polymer stiffness, internally-induced stresses, and thickness of the SPE layer are investigated. The results show that the predictions of the coupled model can strongly deviate from those obtained with an electrochemical model—up to +38% in terms of electrostatic potential difference across the electrolyte layer—depending on the combination of material properties and geometrical features. The predicted stress level in the SPE is considerable as it exceeds the threshold experimentally detected for irreversible deformation or fracture to occur in cells not subjected to external loading. We show that stresses induced by external solicitations can reduce the concentration gradient of ions across the electrolyte thickness and prevent salt depletion at the electrode-electrolyte interface. Subject Battery performanceElectrochemical-mechanical couplingMechanical propertiesPartial molar volumeSolid polymer electrolytes To reference this document use: http://resolver.tudelft.nl/uuid:2b4daa77-9394-4187-bad9-bb786f3cab8a DOI https://doi.org/10.1016/j.electacta.2018.07.234 ISSN 0013-4686 Source Electrochimica Acta, 296, 1122-1141 Part of collection Institutional Repository Document type journal article Rights © 2019 D. Grazioli, O. Verners, Vahur Zadin, Daniel Brandell, A. Simone Files PDF 1_s2.0_S0013468618317626_main.pdf 1.27 MB Close viewer /islandora/object/uuid:2b4daa77-9394-4187-bad9-bb786f3cab8a/datastream/OBJ/view