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In Operando Evaluation of Heterogeneity Development in Fast-Cycled Single-Layer Pouch Cells

Sørensen, Daniel Risskov LU orcid ; Gordon, Ronald ; Smith, Anna ; Kantor, Innokenty LU and Jørgensen, Mads Ry Vogel LU orcid (2024) In Chemistry of Materials 36(21). p.10871-10885
Abstract

Investigating Li-ion batteries during high current rates is becoming increasingly important to advance fast charging of electric vehicles. Here, we use a state-of-the-art synchrotron instrument and detector to measure spatially resolved X-ray diffraction in operando on single-layer pouch cells at 1C and 3C. Using batch refinement on the hundreds of thousands of obtained diffractograms, the electrode lithiation inhomogeneity across the cells induced by cell cycling could be probed. The inhomogeneity was found to depend significantly on C-rate, and the cells were generally more electrochemically active in the center than close to the edges. At high current rates, the expected sequence of lithiated stages in the graphite anode was found to... (More)

Investigating Li-ion batteries during high current rates is becoming increasingly important to advance fast charging of electric vehicles. Here, we use a state-of-the-art synchrotron instrument and detector to measure spatially resolved X-ray diffraction in operando on single-layer pouch cells at 1C and 3C. Using batch refinement on the hundreds of thousands of obtained diffractograms, the electrode lithiation inhomogeneity across the cells induced by cell cycling could be probed. The inhomogeneity was found to depend significantly on C-rate, and the cells were generally more electrochemically active in the center than close to the edges. At high current rates, the expected sequence of lithiated stages in the graphite anode was found to no longer hold. Areas of the electrodes were also found to behave very differently from others, probably due to local differences in resistance. These behaviors are detectable only at high C-rates using in operando methods. Using the methods developed in this work allows for investigating pouch cells that are close to commercial sizes.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Chemistry of Materials
volume
36
issue
21
pages
15 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85207711785
ISSN
0897-4756
DOI
10.1021/acs.chemmater.4c01483
language
English
LU publication?
yes
id
909554e3-d730-41d9-b39a-0687145ae6bb
date added to LUP
2024-12-17 15:44:21
date last changed
2025-04-04 14:27:25
@article{909554e3-d730-41d9-b39a-0687145ae6bb,
  abstract     = {{<p>Investigating Li-ion batteries during high current rates is becoming increasingly important to advance fast charging of electric vehicles. Here, we use a state-of-the-art synchrotron instrument and detector to measure spatially resolved X-ray diffraction in operando on single-layer pouch cells at 1C and 3C. Using batch refinement on the hundreds of thousands of obtained diffractograms, the electrode lithiation inhomogeneity across the cells induced by cell cycling could be probed. The inhomogeneity was found to depend significantly on C-rate, and the cells were generally more electrochemically active in the center than close to the edges. At high current rates, the expected sequence of lithiated stages in the graphite anode was found to no longer hold. Areas of the electrodes were also found to behave very differently from others, probably due to local differences in resistance. These behaviors are detectable only at high C-rates using in operando methods. Using the methods developed in this work allows for investigating pouch cells that are close to commercial sizes.</p>}},
  author       = {{Sørensen, Daniel Risskov and Gordon, Ronald and Smith, Anna and Kantor, Innokenty and Jørgensen, Mads Ry Vogel}},
  issn         = {{0897-4756}},
  language     = {{eng}},
  number       = {{21}},
  pages        = {{10871--10885}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Chemistry of Materials}},
  title        = {{In Operando Evaluation of Heterogeneity Development in Fast-Cycled Single-Layer Pouch Cells}},
  url          = {{http://dx.doi.org/10.1021/acs.chemmater.4c01483}},
  doi          = {{10.1021/acs.chemmater.4c01483}},
  volume       = {{36}},
  year         = {{2024}},
}