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Multiscale tomographic analysis of the thermal failure of Na-Ion batteries

Robinson, JB; Heenan, TMM; Jervis, JR; Tan, C; Kendrick, E; Brett, DJL; Shearing, PR; (2018) Multiscale tomographic analysis of the thermal failure of Na-Ion batteries. Journal of Power Sources , 400 pp. 360-368. 10.1016/j.jpowsour.2018.07.098. Green open access

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Abstract

In recent years, the ability to examine the processes that cause the catastrophic failure of batteries as a result of thermal runaway has improved substantially. In this work, the effect of thermal runaway on the microstructure of the electrodes of a Na-ion battery is examined using X-ray computed tomography for the first time. The thermal failure induced via accelerating rate calorimetry enabled the examination of failed electrodes, which were subsequently compared with fresh samples. Pre- and post-mortem microstructural analysis shows changes in both electrodes as a result of the thermal runaway process at the micrometre length-scale. It is seen that the cathode shows the largest changes in structure, with the anode remaining morphologically similar post-failure at the sub-micron length-scale. The formation of a highly X-ray attenuating layer, which is proposed to be a metallic product of the thermal runaway reaction, is observed, indicating that the thermal runaway mechanisms which occur in Na-ion batteries may be similar to those reported for Li-ion systems.

Type: Article
Title: Multiscale tomographic analysis of the thermal failure of Na-Ion batteries
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jpowsour.2018.07.098
Publisher version: http://dx.doi.org/10.1016/j.jpowsour.2018.07.098
Language: English
Additional information: © 2018 This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Thermal runaway; Na-ion battery; X-ray computed tomography; microstructural analysis; battery failure; accelerating rate calorimetry
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/10058678
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