Lithium‐Ion Transfer at Cathode‐Electrolyte Interface in Diluted Electrolytes Using Electrochemical Impedance Spectroscopy
Lithium‐Ion Transfer at Cathode‐Electrolyte Interface in Diluted Electrolytes Using Electrochemical Impedance Spectroscopy
复制标题
使用电化学阻抗谱研究稀释电解质中阴极-电解质界面的锂离子转移
DOI：
10.1002/celc.202000173
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
T. Abe
中科院分区：
文献类型：
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作者：
T. Ohashi;K. Okazaki;T. Fukunaga;Z. Ogumi;T. Abe
电化学阻抗谱（EIS）在不破坏电子器件的前提下，利用不同时间常数的宽频扫描，对基元过程进行分离，具有上级性能。因此，它适用于锂离子电池（LIB）中电极和电解质之间的界面评价。使用LIB的阴极半电池，在精确控制的充电状态下对各种电解质浓度和静止时间进行系统的EIS分析。在稀电解质溶液中，充放电过程中的电荷转移电阻存在明显的滞后现象，而且滞后现象随着静置时间的延长而增大，甚至在10 h后仍保持不变。 很可能的是，滞后是由阴极-电解质界面的演变引起的，这将取决于基于电解质浓度的溶剂化物质与游离溶剂的相对比率。
Electrochemical impedance spectroscopy (EIS) exhibits a superior performance in separating elementary processes based on different time constants of wide frequency scans without the destruction of electronic devices. Therefore, it was adapted for the evaluation of the interface between the electrode and the electrolyte in lithium‐ion batteries (LIBs). Using the cathode half‐cell of the LIBs, systematic EIS analyses were conducted for various electrolyte concentrations and rest periods at precisely controlled states of charge. Remarkable hysteresis of the charge transfer resistance between the charge and discharge processes was presented in the diluted electrolyte solutions; furthermore, the hysteresis increased with longer rest periods and remained even after 10 h. It is very likely that the hysteresis was caused by the evolution of the cathode–electrolyte interface, which would depend on the relative ratio of solvated species to free solvents based on the concentration of the electrolyte.
研究进展，了解用于储能应用的浓缩电解质和电极之间的独特接口。
DOI：
10.1002/advs.201700032
发表时间：
2017-08
期刊：
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
影响因子：
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作者：
Zheng J;Lochala JA;Kwok A;Deng ZD;Xiao J
通讯作者：
Xiao J