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

Fe-based amorphous alloys have attracted increasing attention as potential current-collector materials because of their unique atomic structure and corrosion resistance. In this work, Fe₇₈Si₁₃B₉amorphous-alloy ribbons were employed as current collectors to investigate the influence of annealing treatment on the electrochemical behavior of Li||current collector half-cells. differential scanning calorimetry and x-ray diffraction analyses indicated that partial crystallization occurred after annealing at 480 °C, while the degree of crystallization further increased after annealing at 580 °C. Scanning electron microscopy (SEM) observations revealed obvious changes in surface morphology and crystallization features after annealing treatment. Electrochemical measurements showed that the Fe₇₈Si₁₃B₉alloy annealed at 580 °C demonstrated improved cycling stability and smaller polarization evolution compared with untreated alloy and Cu foil under the present testing conditions. The sample maintained a Coulombic efficiency of approximately 97% after 150 cycles at 1.0 mA cm^-2. In addition, electrochemical impedance spectroscopy and SEM observations of Li deposition morphology suggested lower interfacial impedance and comparatively denser Li deposition morphology after annealing treatment. This work provides insight into the relationship between annealing-induced structural evolution and Li deposition behavior of Fe-based amorphous-alloy current collectors.