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Investigating lithium-ion battery materials during overcharge-induced thermal runaway: an operando and multi-scale X-ray CT study.

Finegan, D P*; Scheel, M*; Robinson, J B*; Tjaden, B*; Di Michiel, M*; Hinds, G; Brett, D J L*; Shearing, P R* (2016) Investigating lithium-ion battery materials during overcharge-induced thermal runaway: an operando and multi-scale X-ray CT study. Phys. Chem. Chem. Phys., 18 (45). pp. 30912-30919.

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Abstract

Catastrophic failure of lithium-ion batteries occurs across multiple length scales and over very short time periods. A combination of high-speed operando tomography, thermal imaging and electrochemical measurements is used to probe the degradation mechanisms leading up to overcharge-induced thermal runaway of a LiCoO2 pouch cell, through its interrelated dynamic structural, thermal and electrical responses. Failure mechanisms across multiple length scales are explored using a post-mortem multi-scale tomography approach, revealing significant morphological and phase changes in the LiCoO2 electrode microstructure and location dependent degradation. This combined operando and multi-scale X-ray CT technique is demonstrated as a comprehensive approach to understanding battery degradation and failure.

Item Type: Article
Subjects: Advanced Materials
Advanced Materials > Fuels Cells
Identification number/DOI: 10.1039/c6cp04251a
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/7346

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