Ultrathin Two-Dimensional Fe-Co Bimetallic Oxide Nanosheets for Separator Modification of Lithium-Sulfur Batteries

The shuttle effect is understood to be the most significant issue that needs to be solved to improve the performance of lithium-sulfur batteries. In this study, ultrathin two-dimensional Fe-Co bimetallic oxide nanosheets were prepared using graphene as a template, which could rapidly catalyze the co...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2022-11, Vol.27 (22), p.7762
Main Authors: Pu, Jun, Tan, Yun, Wang, Tao, Zhu, Xiaomei, Fan, Shanshan
Format: Article
Language:English
Subjects:
Adsorption
Batteries
Bimetals
Carbon
Chemical reaction, Rate of
Cobalt
CoFe2O4
Diffusion rate
Electric properties
Electrical conductivity
Energy
Graphene
Lithium
Lithium ions
Lithium sulfur batteries
Metal oxides
Morphology
multifunctional separators
Separators
Spectrum analysis
Sulfur
Sulfur compounds
Transmission electron microscopy
two-dimensional materials
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Summary:The shuttle effect is understood to be the most significant issue that needs to be solved to improve the performance of lithium-sulfur batteries. In this study, ultrathin two-dimensional Fe-Co bimetallic oxide nanosheets were prepared using graphene as a template, which could rapidly catalyze the conversion of polysulfides and inhibit the shuttle effect. Additionally, such ultrathin nanostructures based on graphene provided sufficient active sites and fast diffusion pathways for lithium ions. Taking into account the aforementioned benefits, the ultrathin two-dimensional Fe-Co bimetallic oxide nanosheets modified separator assembled lithium-sulfur batteries delivered an incredible capacity of 1044.2 mAh g at 1 C and retained an excellent reversible capacity of 859.4 mAh g after 100 cycles. Even under high loading, it still achieved high area capacity and good cycle stability (92.6% capacity retention).
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules27227762