Effect of Zn2+ content in ferric chloride solution on the structure and lithium storage performance of α-Fe2O3-based anode materials prepared by a facile thermal decomposition method

作者：Yao, Jinhuan; Zhao, Jianxiong; Li, Yanwei^*; Xu, Meiao

来源：IONICS, 2023, 29(1): 145-158.

DOI：10.1007/s11581-022-04805-y

• Lithium-ion batteries
• alpha-Fe2O3
• Anode materials
• Jarosite residue
• Lithium storage performance

In this work, the effect of Zn2+ content in ferric chloride solution on the structure and lithium storage performance of alpha-Fe2O3-based anode materials prepared via a facile thermal decomposition method are systematically studied. With the increase of Zn2+ content, the as-prepared alpha-Fe2O3-based samples gradually transform from single-phase alpha-Fe2O3 nanoparticles (FZ-0) to alpha-Fe2O3/ZnFe2O4 composites with two-dimensional (2D) porous sheet-like structure (FZ-10, FZ-30, and FZ-50) and finally to alpha-Fe2O3/ZnFe2O4/ZnO composite composed of loosely connected nanoparticles (FZ-70). An appropriate amount of Zn2+ impurity in ferric chloride solution has a positive effect on the lithium storage performance of the prepared electrode materials. Particularly, the FZ-50 exhibits the best lithium storage performance because of the 2D porous morphology and synergistic effect between alpha-Fe2O3 and ZnFe2O4 components. The FZ-50 sample maintains a high reversible capacity of 793 mAh g(-1) after 400 cycles at 0.5 A g(-1); at the high current density of 5.0 A g(-1), it still delivers a specific capacity of 357 mA h g(-1), much higher than the corresponding value (145 mA h g(-1)) of the FZ-0 sample without Zn2+ impurity. The results reported in this work could provide guidance for the facile preparation of high-valued alpha-Fe2O3-based anode materials by comprehensive utilization of jarosite slag or Fe3+ solution containing Zn2+ impurity.

• 单位
  桂林理工大学