Synthesis, the structural and thermal stability of LiCo1 − xFexPO4.

Autor: Aboraia, A. M., Hamdalla, Taymour A., Darwish, A. A. A., Alotaibi, B. M., Al-Ghamdi, S. A., Alfadhli, S., Saad, Mohamed, Zakaly, H. M. H., Shaaban, E. R., Soldatov, Alexander
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Zdroj: Journal of Thermal Analysis & Calorimetry; May2023, Vol. 148 Issue 10, p3981-3991, 11p
Abstrakt: LiCoPO4 is considered the most interesting positive electrode material. Therefore, 4 different percentages of LiCo1 − xFexPO4 were synthesized by a hydrothermal route at low temperatures. The as-prepared sample has a single orthorhombic Pn21a-phase at 220 °C. As a result, the thermodynamics and combustion process were investigated at numerous rates of heating, and the kinetic parameters were calculated using thermogravimetric experiments. Pyrolysis went to the high-temperature region with an increase in intensity in heating rate, according to the TGA study of the combustions. Three stages were determined according to the TGA analysis, and each stage predicted another phase which was confirmed by XRD. The thermodynamics study of LiCo1 − xFexPO4 materials was an efficient technique to investigate the temperature impact on the pyrolysis activity, which may be beneficial in many contemporary applications. The values of Avrami exponent n(χ) calculated in terms of conversion rate dχ/dt of the first, second, and third conversion peak is 2.22 and 2.95 (for different compositions of LiCo1 − xFexPO4 (0 ≤ x ≤ 20)), respectively. The Impedance spectrum shows that the increase in the Fe content improves the electrical conductivity of LiCoPO4. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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