Abstract
Cetyltrimethylammonium bromide (CTAB) was used as fuel in solution combustion synthesis of LiFePO4 powders at various fuel contents (ϕ = 1, 2, and 3). Both conventional and microwave heating methods were applied for ignition of the precursor solution. The slow combustion reaction rate characterized by thermal analysis guaranteed the direct formation of the LiFePO4 phase. Phase evolution studies by X-ray powder diffraction showed that nearly single-phase LiFePO4 powders were obtained at higher fuel contents. The as-combusted powders were calcined at 700 °C for removing the impurity phases. The specific surface area of conventionally combusted powders (137 m2/g) was slightly higher than that for microwave heating, as measured from nitrogen adsorption–desorption isotherms. The higher discharge capacity (91 mAh/g) and higher rate capability were obtained by the microwave-combusted LiFePO4 powders due to their higher crystallinity and lower electrode resistance, as confirmed by electrochemical impedance spectroscopy.
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Initial discharge curves of the as-calcined LiFePO4 powders at 0.1 C rate.
Highlights
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LiFePO4 powders were prepared by solution combustion synthesis method.
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Conventional and microwave ignition were compared.
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Higher crystallinity of the microwave-combusted powders led to the higher discharge capacity.
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Haghi, Z., Masoudpanah, S.M. CTAB-assisted solution combustion synthesis of LiFePO4 powders. J Sol-Gel Sci Technol 91, 335–341 (2019). https://doi.org/10.1007/s10971-019-05002-6
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DOI: https://doi.org/10.1007/s10971-019-05002-6