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.
Solvent-dictated sodium sulfur redox reactions: Investigation of carbonate and ether electrolytes / Zhang, Huang; Diemant, Thomas; Qin, Bingsheng; Li, Huihua; Behm, R. Jürgen; Passerini, Stefano. - In: ENERGIES. - ISSN 1996-1073. - 13:4(2020). [10.3390/en13040836]
Solvent-dictated sodium sulfur redox reactions: Investigation of carbonate and ether electrolytes
Passerini, Stefano
2020
Abstract
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.File | Dimensione | Formato | |
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