1. A metal organic foam-derived zinc cobalt sulfide with improved binding energies towards polysulfides for lithium–sulfur batteries.
- Author
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Zhang, Haikuo, Liu, Jinyun, Lin, Xirong, Zhong, Yan, Ren, Jiahao, Wang, Zhilong, Han, Tianli, and Li, Jinjin
- Subjects
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COBALT sulfide , *LITHIUM sulfur batteries , *ZINC sulfide , *ORGANIC conductors , *BINDING energy , *ALUMINUM foam , *SILVER sulfide , *ALKALINE batteries - Abstract
The shuttle effect of polysulfides is a serious issue for lithium–sulfur (Li–S) batteries, because it leads to rapid capacity decay. Herein, we present a metal organic foam-derived ZnCo 2 S 4 that is capable of forming polar bonds with soluble polysulfides and improving the binding force to suppress the shuttle effect. The ZnCo 2 S 4 also has a smaller Li ion diffusion barrier energy than ZnCo 2 O 4. ZnCo 2 S 4 grown on conductive carbon cloth facilitates fast electron transfer, while its hierarchical structure accommodates the volumetric expansion of sulfur in Li–S batteries. The ZnCo 2 S 4 /S cathodes exhibit a stable capacity of 833 mAh g−1 after 100 cycles at 0.1C and a high Coulombic efficiency of 99.9%, along with a high rate-performance after repeated tests; these features indicate a good potential for energy storage applications. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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