Facile synthesis of Fe3S4 microspheres as advanced anode materials for alkaline iron-based rechargeable batteries

A new kind of spherical Fe3S4 with a 3D hierarchical structure, which is constructed with many intercrossed nanorods, is successfully synthesized via a facile hydrothermal method. The achieved Fe3S4 microspheres are evaluated as advanced anode materials for alkaline iron-based secondary batteries for the first time. Influences of hydrothermal temperature on the physical and electrochemical performances of Fe3S4 particles are investigated systematically. It is found that the Fe3S4 fabricated at 150 degrees C exhibits better electrochemical properties than the ones obtained at other temperatures, including higher discharge capacity, attractive high-rate capability and good cycling stability. At 0.2, 0.4, 1.0, 2.0, and 5.0 C, the Fe3S4(150 degrees C) delivers discharge capacity of similar to 328.5, similar to 307.6, similar to 280.5, similar to 235.9, and similar to 169.5 mAh g(-1), respectively. Especially, after 400 cycles at 1 C/1 C, the Fe3S4(150 degrees C) presents capacity retention of 88.61%. The pronounced performance of Fe3S4 is attributable to its inherent electrochemical activity, unique 3D hierarchical structure, and high S content, eventually resulting in the reduced charge transfer resistance, improved reversibility, and a beneficial porous electrode structure during cycling. Therefore, the as-achieved Fe3S4 microspheres are promising anode materials for high-performance alkaline iron-based batteries. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

A new type of spherical Fe3S4 material with a 3D hierarchical structure was successfully synthesized using a hydrothermal method, showing promising electrochemical properties. Fe3S4 particles prepared at different temperatures exhibited varied performances, with Fe3S4 prepared at 150 degrees Celsius demonstrating the best electrochemical properties.