A study on the impact of lithium-ion cell relaxation on electrochemical impedance spectroscopy

Anup Barai, Gael H. Chouchelamane, Yue Guo, Andrew McGordon, Paul Jennings

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Lithium-ion (Li-ion) batteries are of great interest to the automotive industry due to their higher power and energy density, higher cell voltage, longer cycle life and lower self-discharge compared to other battery chemistries. Electrochemical impedance spectroscopy is a powerful tool employed to investigate the fundamental electrochemical reactions within a Li-ion battery cell, which relates to state of charge, internal temperature and state of health. Its effectiveness has established it as a core method to study electrochemical behaviour of batteries in both off-line and on-line applications. In this work it is shown that in addition to state of charge, internal temperature and state of health, the time period between the removal of an electrical load and the impedance measurement affects the results. The study of five commercially available cells of varying capacities and electrode chemistries show that, regardless of cell type, maximum impedance change takes place within the first 4 h of the relaxation period. The root cause of this impedance change has been discussed from an electrochemical perspective.

Original languageEnglish
Pages (from-to)74-80
Number of pages7
JournalJournal of Power Sources
Volume280
Early online date15 Jan 2015
DOIs
Publication statusPublished - 15 Apr 2015

Keywords

  • EIS
  • Impedance
  • Li-ion battery
  • Relaxation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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