Analysis of 3.4 Ah lithium-sulfur pouch cells by electrochemical impedance spectroscopy

被引:34
|
作者
Capkova, Dominika [1 ]
Knap, Vaclav [2 ,3 ]
Fedorkova, Andrea Strakova [1 ]
Stroe, Daniel-Ioan [3 ]
机构
[1] Pavol Jozef Safarik Univ Kosice, Dept Phys Chem, Kosice 041 54, Slovakia
[2] Czech Tech Univ, Fac Elect Engn, Prague 166 27, Czech Republic
[3] Aalborg Univ, Dept Energy Technol, Aalborg 9220, Denmark
来源
JOURNAL OF ENERGY CHEMISTRY | 2022年 / 72卷
关键词
Lithium-sulfur battery; Impedance; Equivalent circuit; Temperature dependencies; Charging; discharging differences; Dynamic electrochemical impedance; spectroscopy; HIGH-ENERGY DENSITY; ION BATTERY; CATHODE; CARBON; ANODE; INTERPHASE; DISCHARGE; PERFORMANCE; ELECTRODES; INSERTION;
D O I
10.1016/j.jechem.2022.05.026
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Despite great progress in lithium-sulfur (Li-S) batteries, the electrochemical reactions in the cell are not yet fully understood. Electrode processes, complex interfaces and internal resistance may be characterized by electrochemical impedance spectroscopy (EIS). EIS is a non-destructive technique and easy to apply, though there are challenges in ensuring the reproducibility of measurements and the interpretation of impedance data. Here, we present the impedance behavior of a 3.4 Ah Li-S pouch cell characterized by EIS. The impedance changes were analyzed over the entire depth-of-discharge, depth-of-charge, and at various temperatures. Based on the formation of intermediates during (dis)charging, the changes of resistances are observed. Overall, the increase in temperature causes a decrease in electrolyte viscosity, lowering the surface energy which can improve the penetration of the electrolyte into the electrode pores. Moreover, the effect of superimposed AC current during EIS measurement was analyzed, and the results show the dependence of the charge transfer resistance on superimposed AC current which was lower compared to steady-state conditions and consents with theory. (c) 2022 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
引用
收藏
页码:318 / 325
页数:8
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