电解质
电极
介电谱
化学
电化学
锂(药物)
碳酸乙烯酯
电池(电)
参比电极
离子
标准电极电位
半电池
分析化学(期刊)
电阻抗
电极电位
工作电极
钯氢电极
热力学
电气工程
物理化学
工程类
有机化学
功率(物理)
内分泌学
物理
医学
色谱法
作者
Ryoichi Tatara,Pınar Karayaylalı,Yang Yu,Yirui Zhang,Livia Giordano,Filippo Maglia,Roland Jung,Jan Philipp Schmidt,Isaac Lund
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2018-11-27
卷期号:166 (3): A5090-A5098
被引量:188
摘要
Understanding the effect of electrode-electrolyte interface (EEI) on the kinetics of electrode reaction is critical to design high-energy Li-ion batteries. While electrochemical impedance spectroscopy (EIS) is used widely to examine the kinetics of electrode reaction in Li-ion batteries, ambiguities exist in the physical origin of EIS responses for composite electrodes. In this study, we performed EIS measurement by using a three-electrode cell with a mesh-reference electrode, to avoid the effect of counter electrode impedance and artefactual responses due to asymmetric cell configuration, and composite or oxide-only working electrodes. Here we discuss the detailed assignment of impedance spectra for LiCoO2 as a function of voltage. The high-frequency semicircle was assigned to the impedance associated with ion adsorption and desorption at the electrified interface while the low-frequency semicircle was related to the charge transfer impedance associated with desolvation/solvation of lithium ions, and lithium ion intercalation/de-intercalation into/from LixCoO2. Exposure to higher charging voltages and greater hold time at high voltages led to no significant change for the high-frequency component but greater resistance and greater activation energy for the low-frequency circle. The greater charge transfer impedance was attributed to the growth of EEI layers on the charged LixCoO2 surface associated with electrolyte oxidation promoted by ethylene carbonate dehydrogenation.
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