In Situ Electrochemical Impedance Measurements of α-Fe2O3 Nanofibers: Unravelling the Li-Ion Conduction Mechanism in Li-Ion Batteries

Unravelling the lithium-ion transport mechanism in α-Fe2O3 nanofibers through situ electrochemical impedance studies is crucial for realizing their application high-performance anodes batteries. Herein, we report effect of heat treatment conditions on structure, composition, morphology, and properties as an anode The were synthesized via electrospinning post-annealing with differences annealing temperature 300, 500, 700 °C to produce FO300, FO500, FO700 nanofibers, respectively. Improved performance a high reversible specific capacity 599.6 mAh g−1 at current density 1 A was achieved after 50 cycles FO700. spectroscopy conducted during charge/discharge process revealed that charge transfer Li-ion diffusion behaviors related crystallinity structure as-synthesized nanofibers. surfaces converted into Fe metal charging/discharging process, which resulted improved electrical conductivity. electron lifetime, determined by time constant transfer, that, when conversion reaction occurred, electrons tended travel iron role pseudo-resistor negligible capacitance resistance analysis.