Patel, Drasti;
Reid, Hamish;
Ball, Sarah;
Brett, Dan JL;
Shearing, Paul R;
(2022)
X-ray Computed Tomography for Failure Mechanism Characterisation within Layered Pouch Cells.
Johnson Matthey Technology Review
10.1595/205651322x16595441894422.
(In press).
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Abstract
Lithium-ion battery (LIB) safety is a multi-scale problem: from the whole-cell architecture to its composite internal 3D microstructures. Substantial research is required to standardise failure assessments and optimise cell designs to reduce the risks of LIB failure. In this work, the failure response of a 1 Ah layered pouch cell with a commercially available NMC cathode and graphite anode at 100 % SOC (4.2 V) is investigated. The mechanisms of two abuse methods; mechanical (by nail penetration) and thermal (by accelerating rate calorimetry) are compared by using a suite of post-mortem analysis methods. Post-mortem whole-cell architectural changes and electrode layer deformations were analysed for both mechanisms using non-invasive X-ray computed tomography. Furthermore, changes to electrode surfaces, bulk microstructures and particle morphologies are compared by following a proposed cell disassembly and post-mortem sample preparation methodology. Building on the insights into critical architectural weak points, electrode behaviours and particle cracks, the reliability of X-ray computed tomography as a guide for LIB failure assessment is demonstrated.
| Type: | Article |
|---|---|
| Title: | X-ray Computed Tomography for Failure Mechanism Characterisation within Layered Pouch Cells |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1595/205651322x16595441894422 |
| Publisher version: | https://doi.org/10.1595/205651322x16595441894422 |
| Language: | English |
| Additional information: | This article is Open Access under the terms of the Creative Commons CC BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
| UCL classification: | 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 UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10154176 |
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