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Open AccessArticle

Solvent-Dictated Sodium Sulfur Redox Reactions: Investigation of Carbonate and Ether Electrolytes

Xi’an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi’an 710072, Shaanxi, China
Helmholtz Institute Ulm, Helmholtzstraße 11, 89081 Ulm, Germany
Karlsruhe Institute of Technology (KIT), D-76021 Karlsruhe, Germany
Institute of Surface Chemistry and Catalysis, Ulm University, Albert-Einstein-Allee 47, D-89081 Ulm, Germany
Author to whom correspondence should be addressed.
Energies 2020, 13(4), 836;
Received: 9 January 2020 / Revised: 3 February 2020 / Accepted: 12 February 2020 / Published: 14 February 2020
(This article belongs to the Special Issue Novel Technologies for Metal-Ion and Metal Batteries)
Sulfur-based cathode chemistries are essential for the development of high energy density alkali-ion batteries. Here, we elucidate the redox kinetics of sulfur confined on carbon nanotubes, comparing its performance in ether-based and carbonate-based electrolytes at room temperature. The solvent is found to play a key role for the electrochemical reactivity of the sulfur cathode in sodium–sulfur (Na–S) batteries. Ether-based electrolytes contribute to a more complete reduction of sulfur and enable a higher electrochemical reversibility. On the other hand, an irreversible solution-phase reaction is observed in carbonate solvents. This study clearly reveals the solvent-dependent Na–S reaction pathways in room temperature Na–S batteries and provides an insight into realizing their high energy potential, via electrolyte formulation design. View Full-Text
Keywords: sodium-sulfur; redox kinetics; carbonate; ether; electrolyte sodium-sulfur; redox kinetics; carbonate; ether; electrolyte
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MDPI and ACS Style

Zhang, H.; Diemant, T.; Qin, B.; Li, H.; Behm, R.J.; Passerini, S. Solvent-Dictated Sodium Sulfur Redox Reactions: Investigation of Carbonate and Ether Electrolytes. Energies 2020, 13, 836.

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