Based on the utilization of jarosite residue: The lithium storage performance of α-Fe2O3 materials synthesized from different iron solution systems

作者：Yao, Jinhuan; Li, Hongyu; Li, Yanwei^*; Yang, Jianwen; Liu, Botian^*

来源：Journal of Electroanalytical Chemistry, 2022, 907: 116085.

DOI：10.1016/j.jelechem.2022.116085

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

In this work, three kinds of iron simulation solution systems (FeCl3, FeSO4, and Fe-2(SO4)(3) solutions) are prepared and used as an iron source for synthesizing alpha-Fe2O3 electrode materials by the one-step sucrose-assisted thermal decomposition method. The microstructure and lithium storage performance of the as-prepared alpha-Fe2O3 materials are systematically studied by XRD, SEM, TGA, FT-IR, XPS, CV, EIS, and discharge/charge measurements. The results demonstrate that the alpha-Fe2O samples prepared from FeSO4 simulation solution or Fe-2(SO4)(3) simulation solution are composed of interconnected nanorods particles and contain a certain amount of undecomposed SO42- ; while the alpha-Fe2O3 sample prepared from FeCl3 simulation shows irregular particle morphology (with the size ranging from hundreds of nanometers to several microns) and contains a small amount of Cl-. The two alpha-Fe2O3 samples prepared from sulfate simulation solution exhibit high lithium storage activity but experience large capacity fluctuation during cycling. In contrast, the alpha-Fe2O3 sample prepared from the FeCl3 simulation solution gives a lower reversible capacity but much better cycling stability. After 400 cycles at 500 mA g(-1), the alpha-Fe2O3 samples prepared from FeSO4, Fe-2(SO4)(3), and FeCl3 simulation solutions deliver reversible capacities of 947, 1071, and 628 mA h g(-1), respectively. The results reported in this work could provide clues for the structural design and performance modification of Fe-based oxides as anode materials for lithium-ion batteries.

• 单位
  桂林理工大学