Journal
JOURNAL OF POWER SOURCES
Volume 264, Issue -, Pages 30-34Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.04.018
Keywords
Li-S; Energy density; Electrolyte; Electrolyte/sulfur ratio; Pouch cells
Funding
- Bundesministerium far Bildung und Forschung [03X4618A]
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Li-S cells have high potential gravimetric cell energy densities between 200 and 600 Wh kg(-1). To obtain a high cell energy density, the sulfur fraction in the electrode and the sulfur load per cm(2) electrode should be as high as possible next to a good electrochemical sulfur utilization. The quantity of electrolyte added to a cell is crucial for the latter, and an excess of electrolyte is generally beneficial for the electrochemical results. Existing publications on Li-S cells therefore use an excess of electrolyte leading to high electrolyte/sulfur (E/S in ml g(-1)) ratios as these enable high cycle numbers and good sulfur utilization. However, these studies do not take account of the high passive weight of the electrolyte.The high E/S ratios involved mean that the obtained cell energy density is below commercial lithium-ion cell level. To emphasize the impact of the electrolyte on the cell energy density we calculated possible cell energy densities from material test cell experiments for various E/S ratios, sulfur and carbon loads. Furthermore small pouch cells with only a very small dead cell volume absorbing electrolyte are created to examine ideal E/S ratios for a specific electrode. (C) 2014 Elsevier B.V. All rights reserved.
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