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1887
Volume 67, Issue 1
  • ISSN: 2056-5135
  • oa X-Ray Computed Tomography for Failure Mechanism Characterisation within Layered Pouch Cells: Part II

    Post-mortem analysis of failed cells

  • Authors: Drasti Patel1, Hamish Reid1, Sarah Ball2, Dan J. L. Brett1,3 and Paul R. Shearing1,3
  • Affiliations: 1 Electrochemical Innovation Lab, Department of Chemical Engineering, University College LondonTorrington Place, London, WC1E 7JEUK 2 Johnson Matthey142A Park Drive, Milton Park, Abingdon, OX14 4SEUK 3 The Faraday InstitutionQuad One, Becquerel Avenue, Harwell Campus, Didcot, OX11 0RAUK
  • Source: Johnson Matthey Technology Review, Volume 67, Issue 1, Jan 2023, p. 47 - 59
  • DOI: https://doi.org/10.1595/205651323X16686891950941
    • Received: 28 Feb 2022
    • Accepted: 02 Aug 2022
    • Published online: 03 Aug 2022

Abstract

In Part I (1), the failure response of a 1 Ah layered pouch cell with a commercially available nickel manganese cobalt (NMC) cathode and graphite anode at 100% state of charge (SOC) (4.2 V) was investigated for two failure mechanisms: thermal and mechanical. The architectural changes to the whole-cell and deformations of the electrode layers are analysed after failure for both mechanisms. A methodology for post-mortem cell disassembly and sample preparation is proposed and demonstrated to effectively analyse the changes to the electrode surfaces, bulk microstructures and particle morphologies. Furthermore, insights into critical architectural weak points in LIB pouch cells, electrode behaviours and particle cracking are provided using invasive and non-invasive X-ray computed tomography techniques. The findings in this work demonstrate methods by which LIB failure can be investigated and assessed.

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2022-08-03
2024-12-21
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