Fe₂O₃–Ag Porous Film Anodes for Ultrahigh‐Rate Lithium‐Ion Batteries

Abstract

Abstract Fe 2 O 3 is a candidate material for anodes in Li‐ion batteries due to its high theoretical capacity. However, the practical application of Fe 2 O 3 is still limited by its sluggish conversion reactions. In this work, porous Fe 2 O 3 films with homogeneously dispersed Ag nanoparticles are fabricated using a facile one‐step electrostatic spray deposition technique. Both the unique, highly porous structure and the conducting Ag metal contribute to the outstanding electrochemical performance of the anode. The Fe 2 O 3 –Ag composite anode retains stable capacities of 1042 (0.1 C), 961 (1 C) and 857 mA h g −1 (5 C) over 100 cycles. When cycled at even higher rates, competitive capacities of 555 (15 C) and 509 mA h g −1 (20 C) are still acquired. This work might present opportunities to develop an oxide–metal anode with high capacity, long cycling life and good rate capability for Li‐ion batteries.