Crystallization-regulated li deposition behavior on Fe₇₈Si₁₃B₉amorphous-alloy current collectors

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Fe-based amorphous alloys are explored as current collectors due to their unique structure and corrosion resistance.
• Lithium-ion battery performance is significantly influenced by current collector material properties.

Purpose of the Study:

• To investigate the effect of annealing on the electrochemical behavior of Fe78Si13B9 amorphous alloy as a lithium battery current collector.
• To understand the relationship between annealing-induced structural changes and lithium deposition.

Main Methods:

• Differential Scanning Calorimetry (DSC) and X-ray Diffraction (XRD) for structural analysis.
• Scanning Electron Microscopy (SEM) for surface morphology and lithium deposition observation.
• Electrochemical measurements (cycling stability, polarization, Coulombic efficiency) and Electrochemical Impedance Spectroscopy (EIS).

Main Results:

• Annealing at 480°C and 580°C induced partial and increased crystallization, respectively, altering surface morphology.
• The Fe78Si13B9 alloy annealed at 580°C showed improved cycling stability and reduced polarization compared to untreated alloy and copper foil.
• The annealed alloy maintained ~97% Coulombic efficiency after 150 cycles and exhibited lower interfacial impedance with denser lithium deposition.

Conclusions:

• Annealing treatment significantly influences the structural evolution and electrochemical performance of Fe-based amorphous alloy current collectors.
• Optimized annealing enhances lithium deposition behavior and cycling stability, making Fe-based amorphous alloys promising for battery applications.
• This study provides critical insights for developing advanced current collectors for next-generation energy storage devices.