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A model problem concerning ionic transport in microstructured solid electrolytes

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Abstract

We consider ionic transport by diffusion and migration through microstructured solid electrolytes. The assumed constitutive relations for the constituent phases follow from convex energy and dissipation potentials which guarantee thermodynamic consistency. The effective response is determined by homogenizing the relevant field equations via the notion ofmulti-scale convergence. The resulting homogenized response involves several effective tensors, but they all require the solution of just one standard conductivity problem over the representative volume element. A multi-scale model for semicrystalline polymer electrolytes with spherulitic morphologies is derived by applying the theory to a specific class of two-dimensional microgeometries for which the effective response can be computed exactly. An enriched model accounting for a random dispersion of filler particles with interphases is also derived. In both cases, explicit expressions for the effective material parameters are provided. The models are used to explore the effect of crystallinity and filler content on the overall response. Predictions support recent experimental observations on doped poly-ethylene-oxide systems which suggest that the anisotropic crystalline phase can actually support faster ion transport than the amorphous phase along certain directions dictated by the morphology of the polymeric chains. Predictions also support the viewpoint that ceramic fillers improve ionic conductivity and cation transport number via interphasial effects.

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Authors and Affiliations

  1. Departamento de Aeronáutica, Facultad de Ingeniería, Universidad Nacional de La Plata, Avda. 1 esq. 47, B1900TAG, La Plata, Argentina

    Ignacio J. Curto Sillamoni & Martín I. Idiart

  2. CCT La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Calle 8 No 1467, B1904CMC, La Plata, Argentina

    Ignacio J. Curto Sillamoni & Martín I. Idiart

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  1. Ignacio J. Curto Sillamoni
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  2. Martín I. Idiart
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Correspondence to Martín I. Idiart.

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Communicated by Andreas Öchsner.

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Curto Sillamoni, I.J., Idiart, M.I. A model problem concerning ionic transport in microstructured solid electrolytes. Continuum Mech. Thermodyn. 27, 941–957 (2015). https://doi.org/10.1007/s00161-014-0391-4

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  • DOI: https://doi.org/10.1007/s00161-014-0391-4

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