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Published on: May 1, 2016
In Situ Constructing a Catalytic Shell for Sulfur Cathode via Electrochemical Oxidative Polymerization
Guo-Qing Liu1, Qing Hou1, Xiao-Xiang Fan1
1Department of Chemistry, College of Chemistry and Chemical Engineering, Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM) and State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen361005, Fujian, China.
Researchers developed a new catalytic shell for lithium-sulfur batteries using hexafluorocyclotriphosphazene (HFPN). This shell suppresses polysulfide shuttling and enhances sulfur conversion, significantly improving battery lifespan and performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries face challenges from sluggish reaction kinetics and lithium polysulfide (LiPS) shuttling.
- These issues limit the practical application and cycle life of Li-S batteries.
Purpose of the Study:
- To develop a functionalized shell for Li-S battery cathodes.
- To suppress the shuttle effect and promote efficient sulfur conversion.
- To enhance the overall electrochemical performance and lifespan of Li-S batteries.
Main Methods:
- In situ construction of a catalytic shell via electrochemical oxidative polymerization.
- Introduction of hexafluorocyclotriphosphazene (HFPN) as an additive.
- Characterization of the shell's interaction with polysulfides and its catalytic activity.
Main Results:
- The HFPN-derived shell effectively confined polysulfides through chemical interactions, mitigating capacity degradation.
- The shell demonstrated high catalytic activity, facilitating Li2S(2) dissociation and improving sulfur utilization.
- Li-S batteries exhibited enhanced rate capability, ultralow capacity decay (0.034% over 700 cycles), and resistance to self-discharge.
Conclusions:
- The developed adsorption-catalytic shell strategy significantly improves Li-S battery performance.
- This approach offers a promising pathway for next-generation Li-S batteries with extended lifespan and superior electrochemical characteristics.
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