An Analysis Protocol for Three-Electrode Li-Ion Battery Impedance Spectra: Part I. Analysis of a High-Voltage Positive Electrode
| Autor: | Daniel Pritzl, Johannes Landesfeind, Hubert A. Gasteiger |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Battery (electricity)
Materials science Renewable Energy Sustainability and the Environment business.industry 020209 energy Contact resistance 02 engineering and technology Condensed Matter Physics Cathode Lithium-ion battery Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Transmission line law Electrode 0202 electrical engineering electronic engineering information engineering Materials Chemistry Electrochemistry Optoelectronics business Electrical impedance Voltage |
| Zdroj: | Journal of The Electrochemical Society. 164:A1773-A1783 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/2.0131709jes |
| Popis: | A key for the interpretation of porous lithium ion battery electrode impedance spectra is a meaningful and physically motivated equivalent-circuit model. In this work we present a novel approach, utilizing a general transmission line equivalent-circuit model to exemplarily analyze the impedance of a porous high-voltage LiNi0.5Mn1.5O4 (LNMO) cathode. It is based on a LNMO/graphite full-cell setup equipped with a gold wire micro-reference electrode (GWRE) to obtain impedance spectra in both, non-blocking conditions at a potential of 4.4 V cell voltage and in blocking configuration achieved at 4.9 V cell voltage. A simultaneous fitting of both spectra enables the deconvolution of physical effects to quantify over the course of 85 cycles at 40°C: a) the true charge transfer resistance (RCT), b) the pore resistance (RPore), and c) the contact resistance (RCont.). We demonstrate that the charge transfer resistance would be overestimated significantly, if the spectra are fitted with a conventionally used simplified R/Q equivalent-circuit compared to our full transmission line analysis. |
| Databáze: | OpenAIRE |
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