Synthesis and characterization of HoMnxFe1-xO3 perovskite nanoparticle anode for Li-ion batteries

초록

Perovskite-type oxides such as HoFeO3 have emerged as promising anode materials for lithium-ion batteries (LIBs) due to their flexible crystal structure and tunable redox behavior. However, their practical application has been limited by insufficient reversible capacity and rate performance. To address these limitations, we synthesized a series of Mn-doped perovskites, HoMnxFe1-xO3 (0 <= x <= 0.5), via a co-precipitation method followed by sintering, aiming to optimize the electrochemical performance through compositional tuning. Among the compositions, HoMn0.3Fe0.7O3 exhibited the best performance, delivering a high reversible capacity of 503 mAh g- 1 after 100 cycles at 100 mA g- 1 and maintaining 357 mAh g- 1 even at a high current density of 3000 mA g- 1. Structural and surface analyses (XRD, XPS, TEM) confirmed successful Mn incorporation into the HoFeO3 lattice, resulting in a partially amorphous structure with enhanced nanoparticle connectivity. The optimized Mn doping was found to modulate the electronic structure, increase oxygen vacancy concentration, and improve lithium-ion diffusion kinetics, all contributing to enhanced electrochemical performance. These findings highlight the potential of Mn-doped HoFeO3 perovskites as high-performance anode materials for next-generation LIBs.

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