期刊
ENERGIES
卷 13, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/en13040836
关键词
sodium-sulfur; redox kinetics; carbonate; ether; electrolyte
资金
- Initiative and Networking Fund of the Helmholtz Association within the Network of Excellence on post-Lithium batteries [ExNet-0035]
- Chinese Scholarship Council [201508370097, 201808410352]
- Fundamental Research Funds for the Central Universities [31020190QD029]
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.
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