title: Investigating lithium-ion battery materials during overcharge-induced thermal runaway: an operando and multi-scale X-ray CT study.
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 LiCoO2pouch 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 LiCoO2electrode microstructure and location dependent degradation. This combined operando and multi-scale X-ray computed tomography (CT) technique is demonstrated as a comprehensive approach to understanding battery degradation and failure.
authors.affiliation: Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK. p.shearing@ucl.ac.uk.
authors.forename: Donal P
authors.initials: DP
authors.lastname: Finegan
authors.affiliation: ESRF, The European Synchrotron, 71 Rue des Martyrs, 38000 Grenoble, France and Synchrotron Soleil, L'Orme des Merisiers, 91190 Saint-Aubin, France.
authors.forename: Mario
authors.initials: M
authors.lastname: Scheel
authors.affiliation: Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK. p.shearing@ucl.ac.uk.
authors.forename: James B
authors.initials: JB
authors.lastname: Robinson
authors.affiliation: Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK. p.shearing@ucl.ac.uk.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Tjaden
authors.affiliation: ESRF, The European Synchrotron, 71 Rue des Martyrs, 38000 Grenoble, France.
authors.forename: Marco
authors.initials: M
authors.lastname: Di Michiel
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK.
authors.forename: Gareth
authors.initials: G
authors.lastname: Hinds
authors.affiliation: Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK. p.shearing@ucl.ac.uk.
authors.forename: Dan J L
authors.initials: DJ
authors.lastname: Brett
authors.affiliation: Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK. p.shearing@ucl.ac.uk.
authors.forename: Paul R
authors.initials: PR
authors.lastname: Shearing