Crystallization-regulated Li deposition behavior on Fe ₇₈ Si ₁₃ B ₉ amorphous-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, Fe78Si13B9 amorphous-alloy ribbons were employed as current collectors to investigate the influence of annealing treatment on the electrochemical behavior of Li||current collector half-cells. DSC and XRD analyses indicated that partial crystallization occurred after annealing at 480°C, while the degree of crystallization further increased after annealing at 580°C. SEM observations revealed obvious changes in surface morphology and crystallization features after annealing treatment. Electrochemical measurements showed that the Fe78Si13B9 alloy annealed at 580°C exhibited relatively 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 (CE) of approximately 97% after 150 cycles at 1.0 mA cm-2. In addition, EIS and SEM observations of Li deposition morphology suggested relatively 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.