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A metal organic foam-derived multi-layered and porous copper sulfide scaffold as sulfur host with multiple shields for preventing shuttle effect in lithium-sulfur batteries.
- Source :
-
Electrochimica Acta . Oct2020, Vol. 356, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- Huge volume-change of sulfur and the shuttle effect of polysulfides during charge-discharge severely restrict the electrochemical performance of lithium-sulfur (Li-S) batteries. Herein, we present a novel three-dimensional (3D) multi-layered and porous CuS scaffold derived from metal organic foams (MOFs) as high-performance sulfur host for Li-S batteries. The CuS/S composites enable an optimal environment for accommodating the volume-change of sulfur, and the multiple CuS layers form several shields to prevent the loss of sulfur and polysulfides, efficiently suppressing the shuttle effect. The batteries based on the CuS/S composites exhibit a stable capacity of 750 mAh g−1 after 200 cycles at 0.1 C, and a well-recoverable rate-performance after being tested for three rounds repeatedly. Furthermore, density functional theory (DFT) calculations confirm the novel sulfur host exhibits a strong adsorption ability to polysulfides with large adsorption energies and charge transfers towards Li 2 S 4 , Li 2 S 6 , and Li 2 S 8. Image, graphical abstract [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 356
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 145298196
- Full Text :
- https://doi.org/10.1016/j.electacta.2020.136853