Journal
SOLID STATE IONICS
Volume 226, Issue -, Pages 15-23Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2012.08.002
Keywords
Lithium-ion batteries; Electrochemical impedance spectroscopy; State-of-charge; State-of-health
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Funding
- German Federal Ministry of Education and Research
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We studied Li/Li4Ti5O12 and Li/LiCoO2 half-cells as well as Li4Ti5O12/LiCoO2 coin-type battery cells at different state-of-charge over several cycles by means of electrochemical impedance spectroscopy. A simple equivalent-circuit model has been applied to probe changes at the internal interfaces of these batteries. The parameters of this model are used to follow the state-of-charge and state-of-health of the cells. Moreover plain empirical relations were introduced to accurately delineate those courses. (C) 2012 Elsevier B.V. All rights reserved.
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