Understanding the effect of cycling lithium-ion pouch cells under stress using neutron diffraction

Juliane I. Preimesberger, Yan Chen, Ke An, Craig B. Arnold

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Large volume changes of lithium-ion batteries during battery operation affect battery lifetime and performance through mechanical degradation. Therefore, understanding the coupling between mechanics and electrochemistry in these systems is crucial. In this work, we use neutron diffraction to learn how commercial lithium-ion pouch cells are affected by stack pressure during charge and discharge. We find that a change in stack pressure affects the phase transitions in electrode materials, requiring more charge to reach higher state-of-charge phases which results in effective capacity loss for the battery. Also noteworthy is that the copper current collector experiences strain during charge and discharge due to the expansion of the graphite anode, something often overlooked in these systems.

Original languageEnglish
Article number234114
JournalJournal of Power Sources
Volume598
DOIs
StatePublished - Apr 1 2024

Funding

The research described in this paper was primarily supported by Princeton University. The neutron diffraction work used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The authors thank Dunji Yu and Harley Skorpenske for their support for the neutron experiments. The research described in this paper was primarily supported by Princeton University . The neutron diffraction work used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The authors thank Dunji Yu and Harley Skorpenske for their support for the neutron experiments.

Keywords

  • Capacity loss
  • Lithium-ion pouch cells
  • Neutron diffraction
  • Stack pressure

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