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A coupled phase field formulation for modelling fatigue cracking in lithium-ion battery electrode particles

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Title: A coupled phase field formulation for modelling fatigue cracking in lithium-ion battery electrode particles
Authors: Ai, W
Wu, B
Martínez-Pañeda, E
Item Type: Journal Article
Abstract: Electrode particle cracking is one of the main phenomena driving battery capacity degradation. Recent phase field fracture studies have investigated particle cracking behaviour. However, only the beginning of life has been considered and effects such as damage accumulation have been neglected. Here, a multi-physics phase field fatigue model has been developed to study crack propagation in battery electrode particles undergoing hundreds of cycles. In addition, we couple our electrochemo-mechanical formulation with X-ray CT imaging to simulate fatigue cracking of realistic particle microstructures. Using this modelling framework, non-linear crack propagation behaviour is predicted, leading to the observation of an exponential increase in cracked area with cycle number. Three stages of crack growth (slow, accelerating and unstable) are observed, with phenomena such as crack initialisation at concave regions and crack coalescence having a significant contribution to the resulting fatigue crack growth rates. The critical values of C-rate, particle size and initial crack length are determined, and found to be lower than those reported in the literature using static fracture models. Therefore, this work demonstrates the importance of considering fatigue damage in battery degradation models and provides insights on the control of fatigue crack propagation to alleviate battery capacity degradation.
Issue Date: 1-Oct-2022
Date of Acceptance: 25-Jun-2022
URI: http://hdl.handle.net/10044/1/98450
DOI: 10.1016/j.jpowsour.2022.231805
ISSN: 0378-7753
Publisher: Elsevier
Journal / Book Title: Journal of Power Sources
Volume: 544
Copyright Statement: © 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Sponsor/Funder: Medical Research Council (MRC)
Funder's Grant Number: MR/V024124/1
Keywords: physics.chem-ph
03 Chemical Sciences
09 Engineering
Article Number: ARTN 231805
Online Publication Date: 2022-07-23
Appears in Collections:Civil and Environmental Engineering
Dyson School of Design Engineering

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