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2018 | OriginalPaper | Buchkapitel

11. Gradient Elasticity Effects on the Two-Phase Lithiation of LIB Anodes

verfasst von : Ioannis Tsagrakis, Elias C. Aifantis

Erschienen in: Generalized Models and Non-classical Approaches in Complex Materials 2

Verlag: Springer International Publishing

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Abstract

A coupled gradient chemoelasticity theory is employed to model the two-phase mechanism that occurs during lithiation of silicon nanoparticles used to fabricate next generation Li-ion battery (LIB) anodes. It is shown that the strain gradient length scale is able to predict the propagation of an interface front of nonzero thickness advancing from the lithiated to unlithiated region without necessarily including higher-order concentration gradients of the Li ions. Larger strain gradient coefficients (elastic internal lengths) induce more diffused interfaces and faster lithiation, which affect both internal strain and stress distributions in a similar way. Estimates for the migration velocity of the phase boundary are obtained and a range of values of the strain gradient length scale is shown to simulate the observed experimental results.

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Titel: Gradient Elasticity Effects on the Two-Phase Lithiation of LIB Anodes
verfasst von: Ioannis Tsagrakis
Elias C. Aifantis
Verlag: Springer International Publishing
Buch: Generalized Models and Non-classical Approaches in Complex Materials 2
Print ISBN: 978-3-319-77503-6

Electronic ISBN: 978-3-319-77504-3

Copyright-Jahr: 2018
DOI: https://doi.org/10.1007/978-3-319-77504-3_11

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