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

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• 作者：Nina Schweikert ; Ralf Heinzmann ; Andreas Eichh?fer ; Horst Hahn ; Sylvio Indris
• 关键词：Lithium-ion batteries ; Electrochemical impedance spectroscopy ; State-of-charge ; State-of-health
• 刊名：Solid State Ionics
• 出版年：2012
• 出版时间：15 October, 2012
• 年：2012
• 卷：226
• 期：Complete
• 页码：15-23
• 全文大小：1799 K

文摘

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.