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A novel ternary sulfur/carbon@tin dioxide composite with polysulfides-adsorptive shell and conductive core as high-performance lithium‑sulfur battery cathodes.
- Source :
-
Applied Surface Science . Sep2019, Vol. 489, p462-469. 8p. - Publication Year :
- 2019
-
Abstract
- A polysulfides-adsorptive and conductive host for sulfur (S) cathode is highly required for Li S batteries. Herein, we present a unique ternary S/C@SnO 2 composite consisting of a 3D tubular core-shell structure in which a carbon matrix as the core is coated by a porous SnO 2 shell. Sulfur is coated on carbon inside the tubes. The S/C@SnO 2 exhibits a good electrochemical performance including a stable capacity of 730 mAh g−1 after cycling for 500 times at 0.1C, along with a fading rate as low as 0.07% per cycle. The capacities recover well during two rounds of rate-performance measurements, exhibiting a recovery rate exceeding 96.3%. The composite also delivers stable capacities when cycling at different charge vs. discharge rates. The polysulfides-adsorptive capability of the SnO 2 shell as an efficient protection shield is demonstrated through density functional theory calculation, which confirms a high surface-energy of SnO 2 towards Li 2 S 4 , Li 2 S 6 , and Li 2 S 8. The porous carbon matrix inside the SnO 2 tubes provides a good conductivity for sulfur and spaces for the volume-change of sulfur. Those features of the ternary S/C@SnO 2 enable it to be a promising cathode candidate for Li S batteries. Unlabelled Image • A unique ternary sulfur/carbon@tin dioxide composite is reported. • Polysulfides-adsorptive shell and conductive core are achieved. • Ternary composite exhibits a high performance for Li S battery. • First-principle modeling confirms a high surface energy of SnO 2 shell. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 489
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 139275458
- Full Text :
- https://doi.org/10.1016/j.apsusc.2019.06.052