Electrochemical impedance spectroscopy of Li4Ti5O12 and LiCoO2 based half-cells and Li4Ti5O12/LiCoO2 cells: Internal interfaces and influence of state-of-charge and cycle number

被引:29
作者
Schweikert, Nina [1 ]
Heinzmann, Ralf [1 ]
Eichhoefer, Andreas [1 ]
Hahn, Horst [1 ,2 ]
Indris, Sylvio [1 ]
机构
[1] Karlsruhe Inst Technol, Inst Nanotechnol, D-76021 Karlsruhe, Germany
[2] Tech Univ Darmstadt, KIT TUD Joint Res Lab Nanomat, D-64287 Darmstadt, Germany
关键词
Lithium-ion batteries; Electrochemical impedance spectroscopy; State-of-charge; State-of-health; LITHIUM-ION BATTERIES; AC-IMPEDANCE; SECONDARY BATTERIES; ELECTRODES; INTERCALATION; INSERTION; SPINEL; CATHODES; SPECTRA; DIFFRACTION;
D O I
10.1016/j.ssi.2012.08.002
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:15 / 23
页数:9
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