In-Line Monitoring of Li-Ion Battery Electrode Porosity and Areal Loading using Active Thermal Scanning - Modeling and Initial Experiment

Przemyslaw Rupnowski, Michael Ulsh, Bhushan Sopori, Brian G. Green, David L. Wood, Jianlin Li, Yangping Sheng

Research output: Contribution to journalArticlepeer-review

6 Scopus Citations

Abstract

This work focuses on a new technique called active thermal scanning for in-line monitoring of porosity and areal loading of Li-ion battery electrodes. In this technique a moving battery electrode is subjected to thermal excitation and the induced temperature rise is monitored using an infra-red camera. Static and dynamic experiments with speeds up to 1.5 m min−1 are performed on both cathodes and anodes and a combined micro- and macro-scale finite element thermal model of the system is developed. It is shown experimentally and through simulations that during thermal scanning the temperature profile generated in an electrode depends on both coating porosity (or area loading) and thickness. It is concluded that by inverting this relation the porosity (or areal loading) can be determined, if thermal response and thickness are simultaneously measured.

Original languageAmerican English
Pages (from-to)138-148
Number of pages11
JournalJournal of Power Sources
Volume375
DOIs
StatePublished - 2018

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

NREL Publication Number

  • NREL/JA-5900-67996

Keywords

  • Areal loading monitoring
  • Battery electrodes
  • Infrared thermography
  • Porosity monitoring
  • Roll-to-roll fabrication
  • Thermal scanning

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