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Phase-field methods for deformation processes in lithium-ion batteries

Phasenfeld-Methoden für Deformierungsprozesse in Lithium-Ion Batterien
: Hofmann, Tobias
: Heiko, Andrä; Latz, Arnulf; Müller, Ralf; Beck, Tilmann; Seewig, Jörg

Fulltext urn:nbn:de:hbz:386-kluedo-52196 (6.7 MByte PDF)
MD5 Fingerprint: af23035994f057e1f4f7dc126b1b5734
Created on: 10.8.2018

Kaiserslautern: Technische Universität Kaiserslautern, 2018, XVI, 161 pp.
Zugl.: Kaiserslautern, TU, Diss., 2018
ISBN: 978-3-942695-15-2
Dissertation, Electronic Publication
Fraunhofer ITWM ()

A fast numerical method for an advanced electro-chemo-mechanical model is developed which is able to capture phase separation processes in porous materials. This method is applied to simulate lithium-ion battery cells, where the complex microstructure of the electrodes is fully resolved. The intercalation of ions into the popular cathode material LFP leads to a separation into lithium-rich and lithium-poor phases. The large concentration gradients result in high mechanical stresses. A phase-field method applying the Cahn-Hilliard equation is used to describe the diffusion. For the sake of simplicity, the linear elastic case is considered. Numerical tests for fully resolved three-dimensional granular microstructures are discussed in detail.