介电谱
电极
极化(电化学)
分析化学(期刊)
电化学
离子
材料科学
锂(药物)
电阻抗
电化学电池
电极电位
化学
电气工程
物理化学
工程类
内分泌学
医学
有机化学
色谱法
作者
Tom Patrick Heins,Nicolas Schlüter,Uwe Schröder
标识
DOI:10.1002/celc.201700686
摘要
Abstract The ageing of large‐scale lithium‐ion batteries due to prolonged cycling was investigated by means of electrochemical impedance spectroscopy. The resulting spectra were analyzed by using the method of the distribution of relaxation times. Thereby, the number of distinguishable polarization processes that contribute to the overall cell electrochemistry was determined. The physical meaning of these polarization processes was clarified by the assessment of their temperature dependences as well as by comparative measurements in three‐electrode setup cells. In this way, electrode‐resolved interpretation of impedance spectra of large‐scale lithium‐ion cells without any kind of reference electrode was achieved. Based on this electrode resolution, the origin of the cell degradation due to cycling could be elucidated.
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