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Erschienen in: Acta Mechanica 3/2020

14.12.2019 | Original Paper

Theoretical analysis of the mechanical behavior in Li–ion battery cylindrical electrodes with phase transformation

verfasst von: Li Weng, Chengjun Xu, Bingbing Chen, Jianqiu Zhou, Rui Cai, Fei Wang

Erschienen in: Acta Mechanica | Ausgabe 3/2020

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Abstract

Diffusion-induced stress caused by the insertion and extraction of lithium ions can result in the swelling, fracture, and even pulverization of the battery electrodes. However, only a few previous studies consider the phenomenon of phase transformation in an electrode and rarely take the impacts of cylindrical shape with transversely isotropic properties into account. In this paper, by researching the electronic reaction and diffusion process, a new theoretical model is established to study the stress level and mechanical behavior in cylindrical electrodes with phase transformation under galvanostatic operation. From the model, the brittle center and edge cracks are analyzed to investigate the influence of the initiation position on crack propagation. The tangential stress plays an important role in cracking on the electrodes. Furthermore, it is found for the center crack that it tends to grow more easily in the first insertion when the crack locates at the phase interface position, while for the edge crack, it tends to grow more easily in the early stage of lithium ion extraction. Moreover, manufacturing the electrodes with the appropriate property ratios, the diffusion-induced stress level and brittle crack-induced stress intensity factor value may decrease, and the electrode fracture phenomenon could be alleviated to some degree. Overall, our work provides a theoretical basis for the electrode phase transformation and cracking when the battery is working, and it may help us understand more about the internal mechanical behavior of the battery electrodes.
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Metadaten
Titel
Theoretical analysis of the mechanical behavior in Li–ion battery cylindrical electrodes with phase transformation
verfasst von
Li Weng
Chengjun Xu
Bingbing Chen
Jianqiu Zhou
Rui Cai
Fei Wang
Publikationsdatum
14.12.2019
Verlag
Springer Vienna
Erschienen in
Acta Mechanica / Ausgabe 3/2020
Print ISSN: 0001-5970
Elektronische ISSN: 1619-6937
DOI
https://doi.org/10.1007/s00707-019-02589-3

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