Amorphous Tin Oxide Nanohelix Structure Based Electrode for Highly Reversible Na-Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Sodium-ion batteries (SIBs) are a promising alternative to lithium-ion batteries due to the abundance of sodium.
• Developing high-performance electrode materials is crucial for advancing SIB technology.
• Amorphous materials and nanostructures offer unique advantages for electrochemical energy storage.

Purpose of the Study:

• To fabricate amorphous tin oxide (a-SnO_x) nanohelixes (NHs) as an electrode material for SIBs.
• To investigate the electrochemical performance of a-SnO_x NHs for sodium storage.
• To compare the performance of a-SnO_x NHs with conventional crystalline nanoparticle electrodes.

Main Methods:

• Fabrication of a-SnO_x NHs on copper foil using oblique angle deposition (OAD).
• Characterization of the morphology, structure, and composition of the fabricated nanohelixes.
• Electrochemical testing of the a-SnO_x NHs as an anode material in Na-ion batteries, including cycling performance, rate capability, and stability.

Main Results:

• Vertically aligned amorphous tin oxide nanohelixes were successfully synthesized.
• The a-SnO_x NH electrode exhibited a high reversible capacity of 915 mA h g^-1 after 50 cycles.
• The electrode demonstrated excellent rate capability with 48.1% capacity retention at 2 A g^-1 and superior stability compared to crystalline nanoparticle electrodes.

Conclusions:

• Amorphous tin oxide nanohelixes are a promising anode material for high-performance sodium-ion batteries.
• The unique nanostructure and amorphous nature facilitate efficient sodium-ion diffusion and volume accommodation.
• This study highlights the potential of nanostructured amorphous metal oxides for next-generation energy storage devices.