Interconnected porous aggregate structure α-Fe ₂ O ₃ prepared from iron concentrate leaching solution as anode material for lithium ions batteries

A straightforward chemical precipitation technique is used to synthesize interconnected α-Fe 2 O 3 particles, utilizing sulfuric acid leaching liquor from iron concentrate as the iron source. The study extensively explores the influence of various precipitants such as sodium carbonate, sodium hydroxide, and ammonia on the microstructure and lithium storage abilities of the produced α-Fe 2 O 3 . All α-Fe 2 O 3 samples exhibit an interconnected porous aggregate structure, with particle sizes varying between 8 and 12 μm. Among the α-Fe 2 O 3 samples, the sample prepared using sodium carbonate as the precipitating agent (FO-1) exhibits the best electrochemical performance as an anode material for LIBs. Following 200 cycles at 0.5 A g -1 , the FO-1 electrode demonstrates a reversible discharge capacity of 1270.92 mAh g -1 . Despite at a current density of 5 A g -1 , the FO-1 electrode still holds a reversible discharge capacity of 411.1 mAh g -1 . The superior electrochemical performance of sample FO-1 is linked to its decreased average particle size, facilitating the creation of more active sites, boosting cycling stability, and shortening ion diffusion distances. The results of this research provide crucial understanding for the efficient utilization of iron concentrate.