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

نویسندگان

  • Yifan Ye
  • Ayako Kawase
  • Min-Kyu Song
  • Bingmei Feng
  • Yi-Sheng Liu
  • Matthew A. Marcus
  • Jun Feng
  • Elton J. Cairns
  • Jinghua Guo
  • Junfa Zhu
چکیده

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.

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عنوان ژورنال:

دوره 6  شماره 

صفحات  -

تاریخ انتشار 2016