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High-Entropy Alloy Electrocatalysts Bidirectionally Promote Lithium Polysulfide Conversions for Long-Cycle-Life
Fengfeng Han1, Zhilong Wang2, Qi Jin1
1Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin 150025, People's Republic of China.
ACS Nano
|May 29, 2024
Summary
High-entropy alloys (HEAs) enhance lithium-sulfur batteries by stabilizing cathodes and accelerating reactions. This study demonstrates HEAs
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- High-entropy alloys (HEAs) offer unique properties due to their high configurational entropy.
- Incorporating HEAs into sulfur cathodes can mitigate lithium polysulfide shuttling and boost redox kinetics in lithium-sulfur batteries.
- Existing methods for HEA synthesis and integration into battery components require optimization for enhanced performance.
Purpose of the Study:
- To synthesize and characterize nano Pt0.25Cu0.25Fe0.15Co0.15Ni0.2 high-entropy alloys (HEAs) integrated with hollow carbons (HCs) and hypha carbon nanobelts (HCNBs).
- To investigate the catalytic effect of HEAs on lithium polysulfide (LiPS) conversion reactions in lithium-sulfur batteries.
- To evaluate the electrochemical performance of HEA-modified cathodes for improved cycling stability and capacity.
Main Methods:
- Facile pyrolysis strategy for synthesizing nano HEAs on hollow carbons (HEA/HC).
- Integration of HEA/HC nanostructures with hypha carbon nanobelts (HCNBs).
- Density functional theory (DFT) calculations and experimental electrochemical investigations (cycling tests, capacity measurements).
Main Results:
- The synthesized Pt0.25Cu0.25Fe0.15Co0.15Ni0.2 HEAs exhibited a solid-solution phase with strong atomic interactions, leading to a wide spectrum of adsorption energies.
- HEAs provided numerous active sites, effectively catalyzing the cascade conversion of LiPSs and boosting reaction rates.
- The S/HEA@HC/HCNB cathodes demonstrated remarkable cycling stability with a low decay rate (0.034% over 2000 cycles at 1.0 C) and high initial areal capacity (10.2 mAh cm-2 at 9 mg cm-2 sulfur loading, 0.1 C).
Conclusions:
- High-entropy alloys (HEAs) effectively catalyze lithium polysulfide conversion reactions, significantly improving the cycling stability of lithium-sulfur batteries.
- The developed HEA/HC/HCNB nanostructures offer a promising strategy for advancing energy storage applications.
- This research highlights the potential of HEAs as advanced catalysts in next-generation battery technologies.
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