Du, W;
Owen, RE;
Jnawali, A;
Neville, TP;
Iacoviello, F;
Zhang, Z;
Liatard, S;
... Shearing, PR; + view all
(2022)
In-situ X-ray tomographic imaging study of gas and structural evolution in a commercial Li-ion pouch cell.
Journal of Power Sources
, 520
, Article 230818. 10.1016/j.jpowsour.2021.230818.
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Abstract
Gas generation within Li-ion batteries (LIB) can lead to an increase in resistance, thereby, reducing their cycle lifetime. The chance of catastrophic failure via internal gas evolution may increase as a function of cell size and capacity. However, in-situ studies of gas evolution at the cell level are very limited due to limited number of techniques that can effectively probe this. Hence, for the first time, we employed high-energy X-ray tomography to non-destructively observe the structural evolution (gas and electrodes) as a function of cycle numbers for a 400 mAh commercial Li-ion pouch cell. Gas agglomeration led to cell deformation in different areas were observed in 4D (3D + time), the subsequent quantification including the volume fraction, surface area and thickness showed a heterogeneous gas distribution, revealing the degradation mechanism involving the coalescence of gas. This study demonstrates a feasible case of the use of lab-based X-ray to investigate the cell degradation and monitor state of health (SOH) by tracking the thickness in-situ, providing practical guidance for designing safer pouch cells.
| Type: | Article |
|---|---|
| Title: | In-situ X-ray tomographic imaging study of gas and structural evolution in a commercial Li-ion pouch cell |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jpowsour.2021.230818 |
| Publisher version: | https://doi.org/10.1016/j.jpowsour.2021.230818 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Li-ion pouch cell, Cycling, X-ray computed tomography, Gas evolution, Thickness |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS 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 |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10139810 |
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