Electrochemical impedance spectroscopy analysis and modeling of lithium cobalt oxide/carbon batteries
Başlık çevirisi mevcut değil.
- Tez No: 402065
- Danışmanlar: PROF. DR. MARK E. ORAZEM
- Tez Türü: Doktora
- Konular: Kimya Mühendisliği, Chemical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2015
- Dil: İngilizce
- Üniversite: University of Florida
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 78
Özet
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Özet (Çeviri)
This work provides the results of impedance measurements on commercially available LiCoO2|C coin-type battery cells and a process model development with respect to these data. The impedance response was shown to be extremely sensitive to state-of-charge, overcharge, over-discharge, and surrounding temperature. The impedance showed a persistent change to the electrochemical characteristics of a coin cell subject to overcharge; whereas, the electrochemical characteristics returned to normal for a coin cell subject to over-discharge. A measurement model analysis was used to show the reversibility of the impedance behavior of an over-discharged cell and the irreversibility of the impedance response of an overcharged cell. A process model was developed to explain and interpret electrochemical reactions and mass transfer occurring in this type of broadly used Lithium-ion batteries. The process model revealed that the impedance result gives useful and unique information about the Li-ion battery dynamics. The process model for impedance analysis was developed in the context of reactions and transport processes that were hypothesized to govern the performance of the battery. At the carbon electrode, lithium ions and solvent were considered to react to form a solid-electrolyte interphase (SEI). In addition, lithium ions were assumed to diffuse through the SEI to intercalate into the graphene layers. As these two processes involve an addition of currents, the corresponding impedances must be considered to be in parallel. Anomalous diffusion of lithium ions was invoked at the LiCoO2 electrode to account for the low-frequency line that was steeper than the 45 degrees predicted by ordinary diffusion. The inductive behavior on the impedance at very high frequencies was attributed to an artifact of the battery system with the help of the Kramers-Kronig relations. This model was fit to all impedance data collected. The model provided a good description for impedance of batteries under normal operating potentials and temperatures. The contribution of anomalous diffusion was diminished at elevated temperatures, suggesting that the free-energy well associated with anomalous or sticky diffusion was shallow.
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