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Vacuum Pyrolysis Engineered CoSb/C Scaffold for Sodium Metal Anodes with Sodiophilic and Superionic Interphase
Xunan Wei1, Jie Chen1, Zhen Zhang2
1Shenzhen Key Laboratory of Functional Polymers, Graphene Composite Research Center, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
Nano Letters
|July 3, 2026
Summary
This study introduces a novel hollow CoSb/C scaffold for sodium metal anodes, enhancing ion transport and suppressing dendrite growth. This bifunctional material enables stable cycling and improved performance in sodium-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Sodium metal anodes face challenges like dendrite growth and electrolyte depletion due to poor ion transport.
- Developing effective scaffold materials with both sodiophilic sites and fast ion diffusion is crucial but difficult.
Purpose of the Study:
- To create a bifunctional scaffold for sodium metal anodes that addresses dendrite formation and ion transport.
- To enhance the stability and performance of sodium metal batteries.
Main Methods:
- Fabrication of a hollow CoSb/C scaffold using vacuum pyrolysis.
- Electrochemical activation to generate sodiophilic Co nanoparticles and Na3Sb.
- Cryogenic transmission electron microscopy (Cryo-TEM) for interface analysis.
Main Results:
- The scaffold successfully generated sodiophilic Co nanoparticles and a Na3Sb superionic conductor.
- A stable, thin, amorphous solid electrolyte interphase (SEI) was formed, suppressing electrolyte degradation.
- Achieved 99.7% Coulombic efficiency and stable cycling over 1200 hours.
Conclusions:
- The developed bifunctional scaffold effectively suppresses sodium dendrite growth and enhances interfacial kinetics.
- This approach offers a promising strategy for developing high-performance and long-lasting sodium metal batteries.
