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Facile Synthesizing Yolk-Shelled Fe 3 O 4 @Carbon Nanocavities with Balanced Physiochemical Synergism as Efficient Hosts for High-Performance Lithium–Sulfur Batteries.
- Source :
- Batteries; Jun2023, Vol. 9 Issue 6, p295, 14p
- Publication Year :
- 2023
-
Abstract
- The severe "shuttle effect" of dissolved polysulfide intermediates and the poor electronic conductivity of sulfur cathodes cause capacity decay of lithium–sulfur batteries and impede their commercialization. Herein, we synthesized a series of well-designed yolk-shelled Fe<subscript>3</subscript>O<subscript>4</subscript>@carbon (YS-Fe<subscript>3</subscript>O<subscript>4</subscript>@C) nanocavities with different proportions of Fe<subscript>3</subscript>O<subscript>4</subscript> as efficient sulfur hosts to stabilize polysulfide intermediates. The yolk-shelled nanocavity architectures were prepared through a facile method, which could effectively confine the active materials and achieve high conductivity. The polysulfide intermediate shuttle was successfully suppressed by a physiochemical synergism effect combining the retention of carbon shells and the adsorption of Fe<subscript>3</subscript>O<subscript>4</subscript> nanoparticle cores. The highly conductive carbon shell provides efficient pathways for fast electron transportation. Meanwhile, the visible evolution of active materials and a reversible electrochemical reaction are revealed by in situ X-ray diffraction. With the balanced merits of enhanced electrical conductivity of carbon shell and optimal adsorption of Fe<subscript>3</subscript>O<subscript>4</subscript> cores, the S/YS-27Fe<subscript>3</subscript>O<subscript>4</subscript>@C cathode (Fe<subscript>3</subscript>O<subscript>4</subscript> accounts for 27 wt% in YS-Fe<subscript>3</subscript>O<subscript>4</subscript>@C) had the best electrochemical performance, exhibiting a high reversible specific capacity of 731.9 mAh g<superscript>−1</superscript> and long cycle performance at 1 C (capacity fading rate of 0.03% over 200 cycles). [ABSTRACT FROM AUTHOR]
- Subjects :
- LITHIUM sulfur batteries
IRON oxides
ELECTRIC conductivity
Subjects
Details
- Language :
- English
- ISSN :
- 23130105
- Volume :
- 9
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Batteries
- Publication Type :
- Academic Journal
- Accession number :
- 164576411
- Full Text :
- https://doi.org/10.3390/batteries9060295