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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.

Authors :
Chen, Lai
Zhao, Chenying
Lu, Yun
Wan, Lingyi
Yan, Kang
Bai, Youxiang
Liu, Zhiyu
Yang, Xulai
Su, Yuefeng
Wu, Feng
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]

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