کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7733045 1497950 2015 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modeling graphite anodes with serial and transmission line models
ترجمه فارسی عنوان
مدل سازی آند های گرافیت با مدل های خطی سریال و انتقال
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
This study introduces an in-depth impedance analysis of a commercial high-power graphite anode. The impedance spectra measured between 0 °C and 30 °C and 0%-100% SOC were analyzed by the distribution of relaxation times (DRT-method), enabling a separation of loss processes by their individual time constants. Using this method, we separated charge transfer resistance and solid electrolyte interface resistance at medium frequencies (10 Hz-200 Hz) and the contact resistance anode/current collector in the at high frequency range (5 kHz-100 kHz). Two fundamentally different model structures were set up, either (i) two modifications of a serial model connecting RQ-elements and a Warburg element for solid state diffusion, or (ii) three modifications of a transmission line model with one-path or two-path design. The suitability of all serial and TLM model structures was tested, and the fitting procedure was supported using microstructure parameters gained from x-ray tomography. The favored one-path transmission line model reveals that the lithium-ion transport in the electrolyte contributes more to polarization than expected. Impediment of lithium-ion transport is caused by the pore structure and the tortuosity of the high-power graphite anode, and has to be considered for meaningful interpretation of impedance spectra.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 282, 15 May 2015, Pages 335-347
نویسندگان
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