Journal ArticleDOI
Lithium/Sulfur Cell Discharge Mechanism: An Original Approach for Intermediate Species Identification
Céline Barchasz,Florian Molton,Carole Duboc,Jean-Claude Leprêtre,Sébastien Patoux,Fannie Alloin +5 more
TLDR
This study proposes a possible mechanism for sulfur reduction consisting of three steps, and investigates the electrolyte composition at different discharge potentials in a TEGDME-based electrolyte.Abstract:
The lithium/sulfur battery is a promising electrochemical system that has a high theoretical capacity of 1675 mAh g–1, but its discharge mechanism is well-known to be a complex multistep process. As the active material dissolves during cycling, this discharge mechanism was investigated through the electrolyte characterization. Using high-performance liquid chromatography, UV–visible absorption, and electron spin resonance spectroscopies, we investigated the electrolyte composition at different discharge potentials in a TEGDME-based electrolyte. In this study, we propose a possible mechanism for sulfur reduction consisting of three steps. Long polysulfide chains are produced during the first reduction step (2.4–2.2 V vs Li+/Li), such as S82– and S62–, as evidenced by UV and HPLC data. The S3•– radical can also be found in solution because of a disproportionation reaction. S42– is produced during the second reduction step (2.15–2.1 V vs Li+/Li), thus pointing out the gradual decrease of the polysulfide chai...read more
Citations
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Journal ArticleDOI
Rechargeable lithium-sulfur batteries.
Journal ArticleDOI
Lithium–Sulfur Batteries: Electrochemistry, Materials, and Prospects
TL;DR: Constructing S molecules confined in the conductive microporous carbon materials to improve the cyclability of Li-S batteries serves as a prospective strategy for the industry in the future.
Journal ArticleDOI
Designing high-energy lithium–sulfur batteries
TL;DR: This review aims to summarize major developments in the field of lithium-sulfur batteries, starting from an overview of their electrochemistry, technical challenges and potential solutions, along with some theoretical calculation results to advance the understanding of the material interactions involved.
Journal ArticleDOI
Liquid electrolyte lithium/sulfur battery: Fundamental chemistry, problems, and solutions
TL;DR: Li et al. as discussed by the authors discussed the problems and solutions of liquid electrolyte Li/S battery and showed that the dissolution of lithium polysulfide (PS) is essential for the performance of a Li-S cell.
Journal ArticleDOI
Nanostructured Metal Oxides and Sulfides for Lithium-Sulfur Batteries
TL;DR: The use of nanostructured metal oxides and sulfides for high sulfur utilization and long life span of Li-S batteries is reviewed here and the relationships between the intrinsic properties of metal oxide/sulfide hosts and electrochemical performances of Li -S batteries are discussed.
References
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On the Surface Chemical Aspects of Very High Energy Density, Rechargeable Li–Sulfur Batteries
TL;DR: In this article, the surface chemistry developed on Li electrodes in electrolyte solutions for Li-S batteries was rigorously studied using Fourier transform infrared and X-ray photoelectron spectroscopies.