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Open AccessArticle

X-ray Absorption Spectroscopy Characterization of a Li/S Cell

1
National Synchrotron Radiation Laboratory and Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei 230029, China
2
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
3
Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
4
Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720, USA
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School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA
6
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
7
Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA
*
Authors to whom correspondence should be addressed.
Academic Editors: Andy (Xueliang) Sun and Xifei Li
Nanomaterials 2016, 6(1), 14; https://doi.org/10.3390/nano6010014
Received: 16 November 2015 / Revised: 23 December 2015 / Accepted: 6 January 2016 / Published: 11 January 2016
(This article belongs to the Special Issue Nanostructured Materials for Li-Ion Batteries and Beyond)
The X-ray absorption spectroscopy technique has been applied to study different stages of the lithium/sulfur (Li/S) cell life cycle. We have investigated how speciation of S in Li/S cathodes changes upon the introduction of CTAB (cetyltrimethylammonium bromide, CH3(CH2)15N+(CH3)3Br) and with charge/discharge cycling. The introduction of CTAB changes the synthesis reaction pathway dramatically due to the interaction of CTAB with the terminal S atoms of the polysulfide ions in the Na2Sx solution. For the cycled Li/S cell, the loss of electrochemically active sulfur and the accumulation of a compact blocking insulating layer of unexpected sulfur reaction products on the cathode surface during the charge/discharge processes make the capacity decay. A modified coin cell and a vacuum-compatible three-electrode electro-chemical cell have been introduced for further in-situ/in-operando studies. View Full-Text
Keywords: lithium/sulfur cell; X-ray absorption spectroscopy; cetyltrimethylammonium bromide; synthesis; capacity decay; cycled cathode materials; insulating layer; in-situ/in-operando lithium/sulfur cell; X-ray absorption spectroscopy; cetyltrimethylammonium bromide; synthesis; capacity decay; cycled cathode materials; insulating layer; in-situ/in-operando
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MDPI and ACS Style

Ye, Y.; Kawase, A.; Song, M.-K.; Feng, B.; Liu, Y.-S.; Marcus, M.A.; Feng, J.; Cairns, E.J.; Guo, J.; Zhu, J. X-ray Absorption Spectroscopy Characterization of a Li/S Cell. Nanomaterials 2016, 6, 14.

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