Thermodynamics of Lithium-Ion Batteries

Rachid Yazami, Kenza Maher

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)

Abstract

Li-ion batteries (LiB) of coin-cell form factor (2032) were subjected to three different accelerate aging modes; i. overcharge ageing up to 4.9 V end of charge cut-off voltages (COV), ii. thermal aging at 60 °C and 70 °C for a period of up to 8 weeks after being charged to 4.2 V at ambient temperatures , and iii. long cycling at a C/2 rate at ambient temperature for up to 1000 cycles. We found the entropy (ΔS) and enthalpy (ΔH) profiles varied with aging conditions much more readily than open-circuit potential (OCP) profiles. We also found that aged batteries keep a thermodynamic fingerprint of the process by which they aged. This memory effect can be revealed by measuring the entropy and enthalpy of aged cells at two particular OCP of 3.87 V and OCP = 3.94 V, which are specific to LiB based on graphite anode and lithiated cobalt oxide (LCO) cathode material. In fact 3.87 V and 3.94 V are potentials of phase transition in the anode and cathode materials, respectively. Another aspect of the thermodynamics memory effect is a characteristic change of entropy and enthalpy profiles of cells having incurred the same capacity loss under different aging modes as compared to almost identical OCP and discharge profiles.

Original languageEnglish
Title of host publicationLithium-Ion Batteries
Subtitle of host publicationAdvances and Applications
PublisherElsevier B.V.
Pages567-604
Number of pages38
ISBN (Print)9780444595133
DOIs
Publication statusPublished - Jan 2014

Keywords

  • Aging memory
  • Enthalpy
  • Entropy
  • Lithium ion batteries
  • Thermodynamics

ASJC Scopus subject areas

  • Chemical Engineering(all)

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  • Cite this

    Yazami, R., & Maher, K. (2014). Thermodynamics of Lithium-Ion Batteries. In Lithium-Ion Batteries: Advances and Applications (pp. 567-604). Elsevier B.V.. https://doi.org/10.1016/B978-0-444-59513-3.00025-X