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Proceedings Paper

New developments in lithium sulfur batteries
Author(s): Rui Xu; Ilias Belharouak; Xiaofeng Zhang; Bryant Polzin; James C. M. Li
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Paper Abstract

In this work, efforts were conducted in order to mitigate the issue of polysulfides dissolution and hence to improve the capacity and efficiency of Li-sulfur cells. The first approach was achieved by optimizing the amount of sulfur that can be contained in the sulfur/carbon electrode. Five sulfur/carbon ratios were prepared- (1) 50/50, (2) 60/40, (3) 70/30, (4) 80/20, and (5) 90/10- to study the effect of carbon contents on electrochemical cycling. The second approach was by adding nano-sized TiO2 particles having a large specific surface area as the polysulfide adsorbing agent in the electrodes. The impact of nano-sized TiO2 particles in improving the electrochemical properties of sulfur electrodes was investigated using CV measurements and charge/discharge tests. To further enhance the efficiency and cycling stability of Li-S batteries, a novel polysulfide electrolyte was developed. This new electrolyte mainly consisted of pre-dissolved lithium polysulfides (Li2Sx) as an alternative electrolyte salt to replace the lithium bis(trifluoromethanesulfone)imide (LiTFSI). We also used LiNO3 to mitigate the shuttle mechanism that occurs in Li-S cells during the charge and discharge. By creating a dynamic equilibrium at the interface of the cathode and electrolyte, the dissolution of lithium polysulfides, and thus the loss of active materials from the cathode during the discharge and charge of the cell, was greatly prevented.

Paper Details

Date Published: 28 May 2013
PDF: 10 pages
Proc. SPIE 8728, Energy Harvesting and Storage: Materials, Devices, and Applications IV, 872804 (28 May 2013); doi: 10.1117/12.2016110
Show Author Affiliations
Rui Xu, Argonne National Lab. (United States)
Univ. of Rochester (United States)
Ilias Belharouak, Argonne National Lab. (United States)
Xiaofeng Zhang, Argonne National Lab. (United States)
Bryant Polzin, Argonne National Lab. (United States)
James C. M. Li, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 8728:
Energy Harvesting and Storage: Materials, Devices, and Applications IV
Nibir K. Dhar; Palani Balaya; Achyut K. Dutta, Editor(s)

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