NDLI: Oxidation process of polysulfides in charge process for lithium

Content Provider	Springer Nature Link
Author	Xiong, Shizhao Xie, Kai Diao, Yan Hong, Xiaobin
Copyright Year	2012
Abstract	The oxidation of polysulfides to element sulfur in charge process was studied by solution thermodynamic analysis and means of cyclic voltammetry (CV), X-ray diffraction (XRD), and charge–discharge test. Basing on the solution thermodynamic analysis, the oxidation process of polysulfides to element sulfur would arise only if the charge voltage exceeds 3.36 V in a lithium–sulfur cell employing 1.0 M LiN(CF$_{3}$SO$_{2}$)$_{2}$ in 1,2-dimethoxy ethane. Furthermore, the minimum of charge voltage which can push the oxidation would fall down with the increasing solubility of elemental sulfur in electrolyte solution. These analyses were confirmed by practical measurements. One new anodic peak corresponding to the oxidation process of polysulfides to solid sulfur was observed by CV. Both XRD patterns and charge–discharge test showed that the element sulfur appeared in the cathode after the battery was charged over 3.4 V. Hence, the lithium–sulfur cell charged over 3.4 V exhibited an improved cycle life since the capacity degradation between the first cycle and the second was depressed. In order to improve the energy efficiency, carbon disulfide was added in the electrolyte solution of lithium–sulfur cell to increase the solubility of sulfur.
Starting Page	867
Ending Page	872
Page Count	6
File Format	PDF
ISSN	09477047
Journal	Ionics
Volume Number	18
Issue Number	9
e-ISSN	18620760
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-03-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polysulfides Oxidation process Solution thermodynamic analysis Lithium–sulfur batteries Carbon disulfide Condensed Matter Physics Energy Storage Electrochemistry Renewable and Green Energy Optical and Electronic Materials
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Engineering Materials Science Chemical Engineering

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