Finegan, D P*; Darcy, E*; Keyser, M*; Tjaden, B*; Heenan, T M M*; Jervis, R*; Bailey, J J*; Malik, R*; Vo, N T*; Magdysyuk, O V*; Atwood, R*; Drakopoulos, M*; DiMichiel, M*; Rack, A*; Hinds, G; Brett, D J L*; Shearing, P R* (2017) Characterising thermal runaway within lithium-ion cells by inducing and monitoring internal short circuits. Energy Environ. Sci., 10 (6). pp. 1377-1388.

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Abstract

Lithium-ion batteries are being used in increasingly demanding applications where a high standard of safety is of utmost importance. The process of thermal runaway needs to be fully understood in order to progress towards safer cell and battery designs. Here, we demonstrate the application of an internal short circuiting device for controlled, on-demand, initiation of thermal runaway. Through the use of the internal short circuiting device, the location and timing of thermal runaway initiation is pre-determined, allowing in-depth analysis of the initiation and propagation of failure within 18650 cells. The process of thermal runaway is characterised through the use of high-speed X-ray imaging at 2000 frames per second. The cause of unfavourable occurrences such as sidewall rupture, cell bursting, and cell-to-cell propagation within modules is elucidated, and steps towards improved safety of 18650 cells and batteries are discussed.

Item Type:	Article
Subjects:	Advanced Materials Advanced Materials > Fuels Cells
Divisions:	Engineering, Materials & Electrical Science
Identification number/DOI:	10.1039/c7ee00385d
Last Modified:	02 Feb 2018 13:12
URI:	http://eprintspublications.npl.co.uk/id/eprint/7612

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