Investigations on conductivity of nitrogen-doped reduced graphene oxide/Li2FeSiO4 cathode material prepared by microwave-assisted method for lithium-ion batteries | ||
| AUT Journal of Mechanical Engineering | ||
| دوره 9، شماره 2، 2025، صفحه 167-178 اصل مقاله (1.27 M) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/ajme.2025.23280.6119 | ||
| نویسندگان | ||
| Saba Zomorrodi1؛ Seyed Pirouz Hoveida Marashi* 1؛ Zahra Sadeghian2؛ Soheila Javadian3 | ||
| 1Department of Materials Science and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran | ||
| 2Research Institute of Petroleum Industry (RIPI), Tehran, Iran | ||
| 3Faculty of Basic Science, Tarbiat Modares University, Tehran, Iran | ||
| چکیده | ||
| Li2FeSi04 is a promising cathode active material for lithium-ion batteries due to its significant theoretical capacity (332 mAhg-1). Nevertheless, its practical electrochemical performance faces significant hurdles due to low electron conductivity. In the research, a simple solid-state technique was used to synthesize the high-purity cathode material Li2FeSi04. Additionally, nitrogen-doped reduced graphene oxide nanosheets were fabricated using a household microwave-assisted process and then selectively deposited to coat the active cathode material to increase conductivity and significantly improve electrocatalysis. The properties of the as-prepared nanosheets and Li2FeSi04/ nitrogen-doped reduced graphene oxide nanocomposites are studied using X-ray diffraction, high-resolution transmission electron microscopy, field emission scanning electron microscopy, RAMAN spectrometry, and Fourier transform infrared spectroscopy techniques. The study investigated the influence of different amounts of as-prepared nanosheet coatings on the electrical conductivity of the Li2FeSi04 by comparing their band gap energy value. Accordingly, a lower band gap, indicates higher and better electronic conductivity in the cathode of lithium-ion batteries. Therefore, diffusion reflectance spectroscopy and electrochemical impedance spectroscopy were used to determine the band gap size and conductivity. Studies show that coating Li2FeSi04 particles with only 5 wt% nitrogen-doped nanosheets reduced the bandgap energy value by about 0.78 eV and increased the electrical conductivity by 54.31%. It is concluded that Li2FeSi04/ nitrogen-doped reduced graphene oxide nanocomposites can be a promising candidate as a high-performance cathode material for lithium-ion batteries. | ||
| کلیدواژهها | ||
| Lithium Iron Orthosilicate؛ Graphene Nanosheets؛ Solid-State Synthesis؛ Bandgap؛ LIBs | ||
| مراجع | ||
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