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Streamline Sulfur Redox Reactions to Achieve Efficient Room-Temperature Sodium–Sulfur Batteries

Journal Article


Abstract


  • It is vital to dynamically regulate S activity to achieve efficient and stable room-temperature sodium–sulfur (RT/Na−S) batteries. Herein, we report using cobalt sulfide as an electron reservoir to enhance the activity of sulfur cathodes, and simultaneously combining with cobalt single atoms as double-end binding sites for a stable S conversion process. The rationally constructed CoS2 electron reservoir enables the straight reduction of S to short-chain sodium polysulfides (Na2S4) via a streamlined redox path through electron transfer. Meanwhile, cobalt single atoms synergistically work with the electron reservoir to reinforce the streamlined redox path, which immobilize in situ formed long-chain products and catalyze their conversion, thus realizing high S utilization and sustainable cycling stability. The as-developed sulfur cathodes exhibit a superior rate performance of 443 mAh g−1 at 5 A g−1 with a high cycling capacity retention of 80 % after 5000 cycles at 5 A g−1.

Publication Date


  • 2022

Citation


  • Lei, Y., Wu, C., Lu, X., Hua, W., Li, S., Liang, Y., . . . Dou, S. X. (2022). Streamline Sulfur Redox Reactions to Achieve Efficient Room-Temperature Sodium–Sulfur Batteries. Angewandte Chemie - International Edition, 61(16). doi:10.1002/anie.202200384

Scopus Eid


  • 2-s2.0-85124903043

Volume


  • 61

Issue


  • 16

Abstract


  • It is vital to dynamically regulate S activity to achieve efficient and stable room-temperature sodium–sulfur (RT/Na−S) batteries. Herein, we report using cobalt sulfide as an electron reservoir to enhance the activity of sulfur cathodes, and simultaneously combining with cobalt single atoms as double-end binding sites for a stable S conversion process. The rationally constructed CoS2 electron reservoir enables the straight reduction of S to short-chain sodium polysulfides (Na2S4) via a streamlined redox path through electron transfer. Meanwhile, cobalt single atoms synergistically work with the electron reservoir to reinforce the streamlined redox path, which immobilize in situ formed long-chain products and catalyze their conversion, thus realizing high S utilization and sustainable cycling stability. The as-developed sulfur cathodes exhibit a superior rate performance of 443 mAh g−1 at 5 A g−1 with a high cycling capacity retention of 80 % after 5000 cycles at 5 A g−1.

Publication Date


  • 2022

Citation


  • Lei, Y., Wu, C., Lu, X., Hua, W., Li, S., Liang, Y., . . . Dou, S. X. (2022). Streamline Sulfur Redox Reactions to Achieve Efficient Room-Temperature Sodium–Sulfur Batteries. Angewandte Chemie - International Edition, 61(16). doi:10.1002/anie.202200384

Scopus Eid


  • 2-s2.0-85124903043

Volume


  • 61

Issue


  • 16