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Characterising the structural properties of polymer separators for lithium-ion batteries in 3D using phase contrast X-ray microscopy

Finegan, DP; Cooper, SJ; Tjaden, B; Taiwo, OO; Gelb, J; Hinds, G; Brett, DJL; (2016) Characterising the structural properties of polymer separators for lithium-ion batteries in 3D using phase contrast X-ray microscopy. Journal of Power Sources , 333 pp. 184-192. 10.1016/j.jpowsour.2016.09.132. Green open access

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Abstract

Separators are an integral component for optimising performance and safety of lithium-ion batteries; therefore, a clear understanding of how their microstructure affects cell performance and safety is crucial. Phase contrast X-ray microscopy is used here to capture the microstructures of commercial monolayer, tri-layer, and ceramic-coated lithium-ion battery polymer separators. Spatial variations in key structural parameters, including porosity, tortuosity factor and pore size distribution, are determined through the application of 3D quantification techniques and stereology. The architectures of individual layers in multi-layer membranes are characterised, revealing anisotropy in porosity, tortuosity factor and mean pore size of the three types of separator. Detailed structural properties of the individual layers of multi-layered membranes are then related with their expected effect on safety and rate capability of cells.

Type: Article
Title: Characterising the structural properties of polymer separators for lithium-ion batteries in 3D using phase contrast X-ray microscopy
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jpowsour.2016.09.132
Publisher version: http://doi.org/10.1016/j.jpowsour.2016.09.132
Language: English
Additional information: Copyright © 2017 Elsevier Ltd. All rights reserved. This is an Open Access article made available under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International license (CC BY-NC-ND 4.0). This license allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licenses are available at http://creativecommons.org/ licenses/by/4.0. Access may be initially restricted by the publisher.
Keywords: Lithium-ion batteries; Separator; X-ray tomography; Transport properties; Characterisation; Tortuosity
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1528163
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