High-performance sodium-ion anodes enabled by a low-temperature molten salt approach

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Developing advanced electrode materials is crucial for enhancing the performance of sodium-ion batteries (SIBs).
• Graphene-based materials offer unique properties for energy storage applications, but their doping and structural control remain challenging.
• Existing methods for doping graphene often require high temperatures, limiting scalability and material integrity.

Purpose of the Study:

• To develop a facile, low-temperature method for synthesizing nitrogen and sulfur co-doped few-layer graphene (NS-FLG).
• To investigate the electrochemical performance of the as-prepared NS-FLG as an electrode material for SIBs.
• To explore the potential of NS-FLG in advancing energy storage technologies.

Main Methods:

• Fabrication of NS-FLG via annealing graphene oxide in molten KSCN salt at a low temperature of 175 °C.
• Characterization of the NS-FLG material to confirm doping and few-layer structure.
• Electrochemical testing of NS-FLG in SIBs, including capacity, rate capability, and cycling stability measurements.

Main Results:

• Successfully synthesized NS-FLG with a high doping level and unique few-layer structure.
• Achieved a high reversible capacity of 325.4 mA h g-1 at 0.5 A g-1 in SIBs.
• Demonstrated excellent rate capability (203.6 mA h g-1 at 10 A g-1) and ultra-long cyclability over 5100 cycles.

Conclusions:

• The low-temperature doping approach is effective for producing high-performance NS-FLG for SIBs.
• NS-FLG exhibits remarkable electrochemical properties, making it a promising candidate for next-generation energy storage.
• This work opens new possibilities for advanced graphene materials in SIBs and other electrochemical fields.