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

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 i...

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Bibliographic Details
Published in:Journal of power sources 2015-04, Vol.280, p.74-80
Main Authors: Barai, Anup, Chouchelamane, Gael H., Guo, Yue, McGordon, Andrew, Jennings, Paul
Format: Article
Language:English
Subjects:
Crashworthiness
EIS
Electric batteries
Electric charge
Electrochemical impedance spectroscopy
Electrodes
Health
Impedance
Li-ion battery
Lithium batteries
Relaxation
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Summary: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. •Impedance of lithium-ion cell changes with relaxation processes.•Pure ohmic resistance, Ro of the cell is independent of the relaxation processes.•Capacitance, C and total cell resistance, RT changes with relaxation process.•After 4 h relaxation, cell impedance variation falls within the experimental error.•The root causes of these changes are discussed from electrochemical point of view.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2015.01.097