Journal
THEORETICAL AND APPLIED MECHANICS LETTERS
Volume 7, Issue 4, Pages 199-206Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.taml.2017.09.001
Keywords
Lithium-ion battery; Diffusion-induced stress; COMSOL; Chemo-mechanical; Electrode
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Funding
- National Natural Science Foundation of China [11702234, 11602213]
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Electrode is a key component to remain durability and safety of lithium-ion (Li-ion) batteries. Li-ion insertion/removal and thermal expansion mismatch may induce high stress in electrode during charging and discharging processes. In this paper, we present a continuum model based on COMSOL Multiphysics software, which involves thermal, chemical and mechanical behaviors of electrodes. The results show that, because of diffusion-induced stress and thermal mismatch, the electrode geometry plays an important role in diffusion kinetics of Li-ions. A higher local compressive stress results in a lower Li-ion concentration and thus a lower capacity when a particle is embedded another, which is in agreement with experimental observations. (c) 2017 The Author(s). Published by Elsevier Ltd on behalf of The Chinese Society of Theoretical and Applied Mechanics.
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