期刊
JOURNAL OF POWER SOURCES
卷 247, 期 -, 页码 1033-1039出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.04.156
关键词
Li-ion battery; X-ray tomography; Lithium iron phosphate; Tortuosity; Imaged based modelling
资金
- Royal Academy of Engineering
- Office of Naval Research Global
- EPSRC of the Research Complex at Harwell [EP/I02249X/1]
- EPSRC [EP/J003085/1, EP/J010456/1, EP/F007906/1, EP/I02249X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J003085/1, EP/F007906/1, EP/J010456/1, EP/I02249X/1] Funding Source: researchfish
Battery and fuel cell simulations commonly assume that electrodes are macro-homogeneous and isotropic. These simulations have been used to successfully model performance, but give little insight into predicting failure. In Li-ion battery electrodes, it is understood that local tortuosity impacts charging rates, which may cause increased degradation. This report describes a novel approach to quantifying tortuosity based on a heat transfer analogy applied to X-ray microscopy data of a commercially available LiFePO4 electrode. This combination of X-ray imaging and image-based simulation reveals the microscopic performance of the electrode; notably, the tortuosity was observed to vary significantly depending on the direction considered, which suggests that tortuosity might best be quantified using vectors rather than scalars. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.
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