Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 160, Issue 4, Pages A553-A558Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.026304jes
Keywords
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Funding
- Strategic Emerging Industries Program of Shenzhen, China [JCYJ20120618164543322]
- National Natural Science Foundation of China [20803095]
- Engineering Research Center of Advanced Battery Materials, the Ministry of Education, China
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The electrochemical behavior of a lithium/sulfur (Li/S) battery was studied by electrochemical impedance spectroscopy (EIS). An impedance model based on the analysis of EIS spectra as a function of temperature and depth of discharge was developed. Then, by monitoring the evolution of impedance during the cycling process, the capacity fading mechanism of Li/S battery was investigated. The results show that the semicircle at the middle frequency of the EIS spectra is ascribed to the charge-transfer process and the semicircle at high frequency is related to the interphase contact resistance. Furthermore, electrolyte resistance, interphase contact resistance, and charge-transfer resistance vary with cycle number in different manners, and the charge-transfer resistance is the key factor contributing to the capacity fading of Li/S battery. (C) 2013 The Electrochemical Society. [DOI: 10.1149/2.026304jes] All rights reserved.
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